/src/libxml2/tree.c

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/*
 * tree.c : implementation of access function for an XML tree.
 *
 * References:
 *   XHTML 1.0 W3C REC: http://www.w3.org/TR/2002/REC-xhtml1-20020801/
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 *
 */

/* To avoid EBCDIC trouble when parsing on zOS */
#if defined(__MVS__)
#pragma convert("ISO8859-1")
#endif

#define IN_LIBXML
#include "libxml.h"

#include <string.h> /* for memset() only ! */
#include <stddef.h>
#include <limits.h>
#include <ctype.h>
#include <stdlib.h>

#ifdef LIBXML_ZLIB_ENABLED
#include <zlib.h>
#endif

#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/entities.h>
#include <libxml/valid.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#include <libxml/globals.h>
#ifdef LIBXML_HTML_ENABLED
#include <libxml/HTMLtree.h>
#endif
#ifdef LIBXML_DEBUG_ENABLED
#include <libxml/debugXML.h>
#endif

#include "private/buf.h"
#include "private/entities.h"
#include "private/error.h"
#include "private/tree.h"

int __xmlRegisterCallbacks = 0;

/************************************************************************
 *                  *
 *    Forward declarations          *
 *                  *
 ************************************************************************/

static xmlNsPtr
xmlNewReconciledNs(xmlDocPtr doc, xmlNodePtr tree, xmlNsPtr ns);

static xmlChar* xmlGetPropNodeValueInternal(const xmlAttr *prop);

/************************************************************************
 *                  *
 *    Tree memory error handler       *
 *                  *
 ************************************************************************/
/**
 * xmlTreeErrMemory:
 * @extra:  extra information
 *
 * Handle an out of memory condition
 */
static void
xmlTreeErrMemory(const char *extra)
{
    __xmlSimpleError(XML_FROM_TREE, XML_ERR_NO_MEMORY, NULL, NULL, extra);
}

/**
 * xmlTreeErr:
 * @code:  the error number
 * @extra:  extra information
 *
 * Handle an out of memory condition
 */
static void
xmlTreeErr(int code, xmlNodePtr node, const char *extra)
{
    const char *msg = NULL;

    switch(code) {
        case XML_TREE_INVALID_HEX:
      msg = "invalid hexadecimal character value\n";
      break;
  case XML_TREE_INVALID_DEC:
      msg = "invalid decimal character value\n";
      break;
  case XML_TREE_UNTERMINATED_ENTITY:
      msg = "unterminated entity reference %15s\n";
      break;
  case XML_TREE_NOT_UTF8:
      msg = "string is not in UTF-8\n";
      break;
  default:
      msg = "unexpected error number\n";
    }
    __xmlSimpleError(XML_FROM_TREE, code, node, msg, extra);
}

/************************************************************************
 *                  *
 *    A few static variables and macros     *
 *                  *
 ************************************************************************/
/* #undef xmlStringText */
const xmlChar xmlStringText[] = { 't', 'e', 'x', 't', 0 };
/* #undef xmlStringTextNoenc */
const xmlChar xmlStringTextNoenc[] =
              { 't', 'e', 'x', 't', 'n', 'o', 'e', 'n', 'c', 0 };
/* #undef xmlStringComment */
const xmlChar xmlStringComment[] = { 'c', 'o', 'm', 'm', 'e', 'n', 't', 0 };

static int xmlCompressMode = 0;
static int xmlCheckDTD = 1;

#define UPDATE_LAST_CHILD_AND_PARENT(n) if ((n) != NULL) {   \
    xmlNodePtr ulccur = (n)->children;          \
    if (ulccur == NULL) {           \
        (n)->last = NULL;           \
    } else {               \
        while (ulccur->next != NULL) {         \
    ulccur->parent = (n);         \
    ulccur = ulccur->next;          \
  }                \
  ulccur->parent = (n);           \
  (n)->last = ulccur;           \
}}

#define IS_STR_XML(str) ((str != NULL) && (str[0] == 'x') && \
  (str[1] == 'm') && (str[2] == 'l') && (str[3] == 0))

/* #define DEBUG_BUFFER */
/* #define DEBUG_TREE */

/************************************************************************
 *                  *
 *    Functions to move to entities.c once the    *
 *    API freeze is smoothen and they can be made public. *
 *                  *
 ************************************************************************/
#include <libxml/hash.h>

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlGetEntityFromDtd:
 * @dtd:  A pointer to the DTD to search
 * @name:  The entity name
 *
 * Do an entity lookup in the DTD entity hash table and
 * return the corresponding entity, if found.
 *
 * Returns A pointer to the entity structure or NULL if not found.
 */
static xmlEntityPtr
xmlGetEntityFromDtd(const xmlDtd *dtd, const xmlChar *name) {
    xmlEntitiesTablePtr table;

    if((dtd != NULL) && (dtd->entities != NULL)) {
  table = (xmlEntitiesTablePtr) dtd->entities;
  return((xmlEntityPtr) xmlHashLookup(table, name));
  /* return(xmlGetEntityFromTable(table, name)); */
    }
    return(NULL);
}
/**
 * xmlGetParameterEntityFromDtd:
 * @dtd:  A pointer to the DTD to search
 * @name:  The entity name
 *
 * Do an entity lookup in the DTD parameter entity hash table and
 * return the corresponding entity, if found.
 *
 * Returns A pointer to the entity structure or NULL if not found.
 */
static xmlEntityPtr
xmlGetParameterEntityFromDtd(const xmlDtd *dtd, const xmlChar *name) {
    xmlEntitiesTablePtr table;

    if ((dtd != NULL) && (dtd->pentities != NULL)) {
  table = (xmlEntitiesTablePtr) dtd->pentities;
  return((xmlEntityPtr) xmlHashLookup(table, name));
  /* return(xmlGetEntityFromTable(table, name)); */
    }
    return(NULL);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *                  *
 *      QName handling helper       *
 *                  *
 ************************************************************************/

/**
 * xmlBuildQName:
 * @ncname:  the Name
 * @prefix:  the prefix
 * @memory:  preallocated memory
 * @len:  preallocated memory length
 *
 * Builds the QName @prefix:@ncname in @memory if there is enough space
 * and prefix is not NULL nor empty, otherwise allocate a new string.
 * If prefix is NULL or empty it returns ncname.
 *
 * Returns the new string which must be freed by the caller if different from
 *         @memory and @ncname or NULL in case of error
 */
xmlChar *
xmlBuildQName(const xmlChar *ncname, const xmlChar *prefix,
        xmlChar *memory, int len) {
    int lenn, lenp;
    xmlChar *ret;

    if (ncname == NULL) return(NULL);
    if (prefix == NULL) return((xmlChar *) ncname);

    lenn = strlen((char *) ncname);
    lenp = strlen((char *) prefix);

    if ((memory == NULL) || (len < lenn + lenp + 2)) {
  ret = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
  if (ret == NULL) {
      xmlTreeErrMemory("building QName");
      return(NULL);
  }
    } else {
  ret = memory;
    }
    memcpy(&ret[0], prefix, lenp);
    ret[lenp] = ':';
    memcpy(&ret[lenp + 1], ncname, lenn);
    ret[lenn + lenp + 1] = 0;
    return(ret);
}

/**
 * xmlSplitQName2:
 * @name:  the full QName
 * @prefix:  a xmlChar **
 *
 * parse an XML qualified name string
 *
 * [NS 5] QName ::= (Prefix ':')? LocalPart
 *
 * [NS 6] Prefix ::= NCName
 *
 * [NS 7] LocalPart ::= NCName
 *
 * Returns NULL if the name doesn't have a prefix. Otherwise, returns the
 * local part, and prefix is updated to get the Prefix. Both the return value
 * and the prefix must be freed by the caller.
 */
xmlChar *
xmlSplitQName2(const xmlChar *name, xmlChar **prefix) {
    int len = 0;
    xmlChar *ret = NULL;

    if (prefix == NULL) return(NULL);
    *prefix = NULL;
    if (name == NULL) return(NULL);

#ifndef XML_XML_NAMESPACE
    /* xml: prefix is not really a namespace */
    if ((name[0] == 'x') && (name[1] == 'm') &&
        (name[2] == 'l') && (name[3] == ':'))
  return(NULL);
#endif

    /* nasty but valid */
    if (name[0] == ':')
  return(NULL);

    /*
     * we are not trying to validate but just to cut, and yes it will
     * work even if this is as set of UTF-8 encoded chars
     */
    while ((name[len] != 0) && (name[len] != ':'))
  len++;

    if (name[len] == 0)
  return(NULL);

    *prefix = xmlStrndup(name, len);
    if (*prefix == NULL) {
  xmlTreeErrMemory("QName split");
  return(NULL);
    }
    ret = xmlStrdup(&name[len + 1]);
    if (ret == NULL) {
  xmlTreeErrMemory("QName split");
  if (*prefix != NULL) {
      xmlFree(*prefix);
      *prefix = NULL;
  }
  return(NULL);
    }

    return(ret);
}

/**
 * xmlSplitQName3:
 * @name:  the full QName
 * @len: an int *
 *
 * parse an XML qualified name string,i
 *
 * returns NULL if it is not a Qualified Name, otherwise, update len
 *         with the length in byte of the prefix and return a pointer
 *         to the start of the name without the prefix
 */

const xmlChar *
xmlSplitQName3(const xmlChar *name, int *len) {
    int l = 0;

    if (name == NULL) return(NULL);
    if (len == NULL) return(NULL);

    /* nasty but valid */
    if (name[0] == ':')
  return(NULL);

    /*
     * we are not trying to validate but just to cut, and yes it will
     * work even if this is as set of UTF-8 encoded chars
     */
    while ((name[l] != 0) && (name[l] != ':'))
  l++;

    if (name[l] == 0)
  return(NULL);

    *len = l;

    return(&name[l+1]);
}

/************************************************************************
 *                  *
 *    Check Name, NCName and QName strings      *
 *                  *
 ************************************************************************/

#define CUR_SCHAR(s, l) xmlStringCurrentChar(NULL, s, &l)

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED) || defined(LIBXML_DEBUG_ENABLED) || defined (LIBXML_HTML_ENABLED) || defined(LIBXML_SAX1_ENABLED) || defined(LIBXML_HTML_ENABLED) || defined(LIBXML_WRITER_ENABLED) || defined(LIBXML_LEGACY_ENABLED)
/**
 * xmlValidateNCName:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of NCName
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateNCName(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);

    /*
     * First quick algorithm for ASCII range
     */
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) || ((*cur >= 'A') && (*cur <= 'Z')) ||
  (*cur == '_'))
  cur++;
    else
  goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
     ((*cur >= 'A') && (*cur <= 'Z')) ||
     ((*cur >= '0') && (*cur <= '9')) ||
     (*cur == '_') || (*cur == '-') || (*cur == '.'))
  cur++;
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
  return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if ((!IS_LETTER(c)) && (c != '_'))
  return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
     (c == '-') || (c == '_') || IS_COMBINING(c) ||
     IS_EXTENDER(c)) {
  cur += l;
  c = CUR_SCHAR(cur, l);
    }
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (c != 0)
  return(1);

    return(0);
}
#endif

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlValidateQName:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of QName
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateQName(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);
    /*
     * First quick algorithm for ASCII range
     */
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) || ((*cur >= 'A') && (*cur <= 'Z')) ||
  (*cur == '_'))
  cur++;
    else
  goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
     ((*cur >= 'A') && (*cur <= 'Z')) ||
     ((*cur >= '0') && (*cur <= '9')) ||
     (*cur == '_') || (*cur == '-') || (*cur == '.'))
  cur++;
    if (*cur == ':') {
  cur++;
  if (((*cur >= 'a') && (*cur <= 'z')) ||
      ((*cur >= 'A') && (*cur <= 'Z')) ||
      (*cur == '_'))
      cur++;
  else
      goto try_complex;
  while (((*cur >= 'a') && (*cur <= 'z')) ||
         ((*cur >= 'A') && (*cur <= 'Z')) ||
         ((*cur >= '0') && (*cur <= '9')) ||
         (*cur == '_') || (*cur == '-') || (*cur == '.'))
      cur++;
    }
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
  return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if ((!IS_LETTER(c)) && (c != '_'))
  return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
     (c == '-') || (c == '_') || IS_COMBINING(c) ||
     IS_EXTENDER(c)) {
  cur += l;
  c = CUR_SCHAR(cur, l);
    }
    if (c == ':') {
  cur += l;
  c = CUR_SCHAR(cur, l);
  if ((!IS_LETTER(c)) && (c != '_'))
      return(1);
  cur += l;
  c = CUR_SCHAR(cur, l);
  while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') ||
         (c == '-') || (c == '_') || IS_COMBINING(c) ||
         IS_EXTENDER(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (c != 0)
  return(1);
    return(0);
}

/**
 * xmlValidateName:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of Name
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateName(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);
    /*
     * First quick algorithm for ASCII range
     */
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) || ((*cur >= 'A') && (*cur <= 'Z')) ||
  (*cur == '_') || (*cur == ':'))
  cur++;
    else
  goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
     ((*cur >= 'A') && (*cur <= 'Z')) ||
     ((*cur >= '0') && (*cur <= '9')) ||
     (*cur == '_') || (*cur == '-') || (*cur == '.') || (*cur == ':'))
  cur++;
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
  return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if ((!IS_LETTER(c)) && (c != '_') && (c != ':'))
  return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
     (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)) {
  cur += l;
  c = CUR_SCHAR(cur, l);
    }
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (c != 0)
  return(1);
    return(0);
}

/**
 * xmlValidateNMToken:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of NMToken
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateNMToken(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    if (value == NULL)
        return(-1);
    /*
     * First quick algorithm for ASCII range
     */
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) ||
        ((*cur >= 'A') && (*cur <= 'Z')) ||
        ((*cur >= '0') && (*cur <= '9')) ||
        (*cur == '_') || (*cur == '-') || (*cur == '.') || (*cur == ':'))
  cur++;
    else
  goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
     ((*cur >= 'A') && (*cur <= 'Z')) ||
     ((*cur >= '0') && (*cur <= '9')) ||
     (*cur == '_') || (*cur == '-') || (*cur == '.') || (*cur == ':'))
  cur++;
    if (space)
  while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
  return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (!(IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
        (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)))
  return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
     (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)) {
  cur += l;
  c = CUR_SCHAR(cur, l);
    }
    if (space) {
  while (IS_BLANK(c)) {
      cur += l;
      c = CUR_SCHAR(cur, l);
  }
    }
    if (c != 0)
  return(1);
    return(0);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *                  *
 *    Allocation and deallocation of basic structures   *
 *                  *
 ************************************************************************/

/**
 * xmlSetBufferAllocationScheme:
 * @scheme:  allocation method to use
 *
 * Set the buffer allocation method.  Types are
 * XML_BUFFER_ALLOC_EXACT - use exact sizes, keeps memory usage down
 * XML_BUFFER_ALLOC_DOUBLEIT - double buffer when extra needed,
 *                             improves performance
 */
void
xmlSetBufferAllocationScheme(xmlBufferAllocationScheme scheme) {
    if ((scheme == XML_BUFFER_ALLOC_EXACT) ||
        (scheme == XML_BUFFER_ALLOC_DOUBLEIT) ||
        (scheme == XML_BUFFER_ALLOC_HYBRID))
  xmlBufferAllocScheme = scheme;
}

/**
 * xmlGetBufferAllocationScheme:
 *
 * Types are
 * XML_BUFFER_ALLOC_EXACT - use exact sizes, keeps memory usage down
 * XML_BUFFER_ALLOC_DOUBLEIT - double buffer when extra needed,
 *                             improves performance
 * XML_BUFFER_ALLOC_HYBRID - use exact sizes on small strings to keep memory usage tight
 *                            in normal usage, and doubleit on large strings to avoid
 *                            pathological performance.
 *
 * Returns the current allocation scheme
 */
xmlBufferAllocationScheme
xmlGetBufferAllocationScheme(void) {
    return(xmlBufferAllocScheme);
}

/**
 * xmlNewNs:
 * @node:  the element carrying the namespace
 * @href:  the URI associated
 * @prefix:  the prefix for the namespace
 *
 * Creation of a new Namespace. This function will refuse to create
 * a namespace with a similar prefix than an existing one present on this
 * node.
 * Note that for a default namespace, @prefix should be NULL.
 *
 * We use href==NULL in the case of an element creation where the namespace
 * was not defined.
 *
 * Returns a new namespace pointer or NULL
 */
xmlNsPtr
xmlNewNs(xmlNodePtr node, const xmlChar *href, const xmlChar *prefix) {
    xmlNsPtr cur;

    if ((node != NULL) && (node->type != XML_ELEMENT_NODE))
  return(NULL);

    if ((prefix != NULL) && (xmlStrEqual(prefix, BAD_CAST "xml"))) {
        /* xml namespace is predefined, no need to add it */
        if (xmlStrEqual(href, XML_XML_NAMESPACE))
            return(NULL);

        /*
         * Problem, this is an attempt to bind xml prefix to a wrong
         * namespace, which breaks
         * Namespace constraint: Reserved Prefixes and Namespace Names
         * from XML namespace. But documents authors may not care in
         * their context so let's proceed.
         */
    }

    /*
     * Allocate a new Namespace and fill the fields.
     */
    cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
    if (cur == NULL) {
  xmlTreeErrMemory("building namespace");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNs));
    cur->type = XML_LOCAL_NAMESPACE;

    if (href != NULL)
  cur->href = xmlStrdup(href);
    if (prefix != NULL)
  cur->prefix = xmlStrdup(prefix);

    /*
     * Add it at the end to preserve parsing order ...
     * and checks for existing use of the prefix
     */
    if (node != NULL) {
  if (node->nsDef == NULL) {
      node->nsDef = cur;
  } else {
      xmlNsPtr prev = node->nsDef;

      if (((prev->prefix == NULL) && (cur->prefix == NULL)) ||
    (xmlStrEqual(prev->prefix, cur->prefix))) {
    xmlFreeNs(cur);
    return(NULL);
      }
      while (prev->next != NULL) {
          prev = prev->next;
    if (((prev->prefix == NULL) && (cur->prefix == NULL)) ||
        (xmlStrEqual(prev->prefix, cur->prefix))) {
        xmlFreeNs(cur);
        return(NULL);
    }
      }
      prev->next = cur;
  }
    }
    return(cur);
}

/**
 * xmlSetNs:
 * @node:  a node in the document
 * @ns:  a namespace pointer
 *
 * Associate a namespace to a node, a posteriori.
 */
void
xmlSetNs(xmlNodePtr node, xmlNsPtr ns) {
    if (node == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlSetNs: node == NULL\n");
#endif
  return;
    }
    if ((node->type == XML_ELEMENT_NODE) ||
        (node->type == XML_ATTRIBUTE_NODE))
  node->ns = ns;
}

/**
 * xmlFreeNs:
 * @cur:  the namespace pointer
 *
 * Free up the structures associated to a namespace
 */
void
xmlFreeNs(xmlNsPtr cur) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlFreeNs : ns == NULL\n");
#endif
  return;
    }
    if (cur->href != NULL) xmlFree((char *) cur->href);
    if (cur->prefix != NULL) xmlFree((char *) cur->prefix);
    xmlFree(cur);
}

/**
 * xmlFreeNsList:
 * @cur:  the first namespace pointer
 *
 * Free up all the structures associated to the chained namespaces.
 */
void
xmlFreeNsList(xmlNsPtr cur) {
    xmlNsPtr next;
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlFreeNsList : ns == NULL\n");
#endif
  return;
    }
    while (cur != NULL) {
        next = cur->next;
        xmlFreeNs(cur);
  cur = next;
    }
}

/**
 * xmlNewDtd:
 * @doc:  the document pointer
 * @name:  the DTD name
 * @ExternalID:  the external ID
 * @SystemID:  the system ID
 *
 * Creation of a new DTD for the external subset. To create an
 * internal subset, use xmlCreateIntSubset().
 *
 * Returns a pointer to the new DTD structure
 */
xmlDtdPtr
xmlNewDtd(xmlDocPtr doc, const xmlChar *name,
                    const xmlChar *ExternalID, const xmlChar *SystemID) {
    xmlDtdPtr cur;

    if ((doc != NULL) && (doc->extSubset != NULL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewDtd(%s): document %s already have a DTD %s\n",
      /* !!! */ (char *) name, doc->name,
      /* !!! */ (char *)doc->extSubset->name);
#endif
  return(NULL);
    }

    /*
     * Allocate a new DTD and fill the fields.
     */
    cur = (xmlDtdPtr) xmlMalloc(sizeof(xmlDtd));
    if (cur == NULL) {
  xmlTreeErrMemory("building DTD");
  return(NULL);
    }
    memset(cur, 0 , sizeof(xmlDtd));
    cur->type = XML_DTD_NODE;

    if (name != NULL)
  cur->name = xmlStrdup(name);
    if (ExternalID != NULL)
  cur->ExternalID = xmlStrdup(ExternalID);
    if (SystemID != NULL)
  cur->SystemID = xmlStrdup(SystemID);
    if (doc != NULL)
  doc->extSubset = cur;
    cur->doc = doc;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlGetIntSubset:
 * @doc:  the document pointer
 *
 * Get the internal subset of a document
 * Returns a pointer to the DTD structure or NULL if not found
 */

xmlDtdPtr
xmlGetIntSubset(const xmlDoc *doc) {
    xmlNodePtr cur;

    if (doc == NULL)
  return(NULL);
    cur = doc->children;
    while (cur != NULL) {
  if (cur->type == XML_DTD_NODE)
      return((xmlDtdPtr) cur);
  cur = cur->next;
    }
    return((xmlDtdPtr) doc->intSubset);
}

/**
 * xmlCreateIntSubset:
 * @doc:  the document pointer
 * @name:  the DTD name
 * @ExternalID:  the external (PUBLIC) ID
 * @SystemID:  the system ID
 *
 * Create the internal subset of a document
 * Returns a pointer to the new DTD structure
 */
xmlDtdPtr
xmlCreateIntSubset(xmlDocPtr doc, const xmlChar *name,
                   const xmlChar *ExternalID, const xmlChar *SystemID) {
    xmlDtdPtr cur;

    if ((doc != NULL) && (xmlGetIntSubset(doc) != NULL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,

     "xmlCreateIntSubset(): document %s already have an internal subset\n",
      doc->name);
#endif
  return(NULL);
    }

    /*
     * Allocate a new DTD and fill the fields.
     */
    cur = (xmlDtdPtr) xmlMalloc(sizeof(xmlDtd));
    if (cur == NULL) {
  xmlTreeErrMemory("building internal subset");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlDtd));
    cur->type = XML_DTD_NODE;

    if (name != NULL) {
  cur->name = xmlStrdup(name);
  if (cur->name == NULL) {
      xmlTreeErrMemory("building internal subset");
      xmlFree(cur);
      return(NULL);
  }
    }
    if (ExternalID != NULL) {
  cur->ExternalID = xmlStrdup(ExternalID);
  if (cur->ExternalID  == NULL) {
      xmlTreeErrMemory("building internal subset");
      if (cur->name != NULL)
          xmlFree((char *)cur->name);
      xmlFree(cur);
      return(NULL);
  }
    }
    if (SystemID != NULL) {
  cur->SystemID = xmlStrdup(SystemID);
  if (cur->SystemID == NULL) {
      xmlTreeErrMemory("building internal subset");
      if (cur->name != NULL)
          xmlFree((char *)cur->name);
      if (cur->ExternalID != NULL)
          xmlFree((char *)cur->ExternalID);
      xmlFree(cur);
      return(NULL);
  }
    }
    if (doc != NULL) {
  doc->intSubset = cur;
  cur->parent = doc;
  cur->doc = doc;
  if (doc->children == NULL) {
      doc->children = (xmlNodePtr) cur;
      doc->last = (xmlNodePtr) cur;
  } else {
      if (doc->type == XML_HTML_DOCUMENT_NODE) {
    xmlNodePtr prev;

    prev = doc->children;
    prev->prev = (xmlNodePtr) cur;
    cur->next = prev;
    doc->children = (xmlNodePtr) cur;
      } else {
    xmlNodePtr next;

    next = doc->children;
    while ((next != NULL) && (next->type != XML_ELEMENT_NODE))
        next = next->next;
    if (next == NULL) {
        cur->prev = doc->last;
        cur->prev->next = (xmlNodePtr) cur;
        cur->next = NULL;
        doc->last = (xmlNodePtr) cur;
    } else {
        cur->next = next;
        cur->prev = next->prev;
        if (cur->prev == NULL)
      doc->children = (xmlNodePtr) cur;
        else
      cur->prev->next = (xmlNodePtr) cur;
        next->prev = (xmlNodePtr) cur;
    }
      }
  }
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * DICT_FREE:
 * @str:  a string
 *
 * Free a string if it is not owned by the "dict" dictionary in the
 * current scope
 */
#define DICT_FREE(str)            \
  if ((str) && ((!dict) ||       \
      (xmlDictOwns(dict, (const xmlChar *)(str)) == 0))) \
      xmlFree((char *)(str));


/**
 * DICT_COPY:
 * @str:  a string
 *
 * Copy a string using a "dict" dictionary in the current scope,
 * if available.
 */
#define DICT_COPY(str, cpy) \
    if (str) { \
  if (dict) { \
      if (xmlDictOwns(dict, (const xmlChar *)(str))) \
    cpy = (xmlChar *) (str); \
      else \
    cpy = (xmlChar *) xmlDictLookup((dict), (const xmlChar *)(str), -1); \
  } else \
      cpy = xmlStrdup((const xmlChar *)(str)); }

/**
 * DICT_CONST_COPY:
 * @str:  a string
 *
 * Copy a string using a "dict" dictionary in the current scope,
 * if available.
 */
#define DICT_CONST_COPY(str, cpy) \
    if (str) { \
  if (dict) { \
      if (xmlDictOwns(dict, (const xmlChar *)(str))) \
    cpy = (const xmlChar *) (str); \
      else \
    cpy = xmlDictLookup((dict), (const xmlChar *)(str), -1); \
  } else \
      cpy = (const xmlChar *) xmlStrdup((const xmlChar *)(str)); }


/**
 * xmlFreeDtd:
 * @cur:  the DTD structure to free up
 *
 * Free a DTD structure.
 */
void
xmlFreeDtd(xmlDtdPtr cur) {
    xmlDictPtr dict = NULL;

    if (cur == NULL) {
  return;
    }
    if (cur->doc != NULL) dict = cur->doc->dict;

    if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
  xmlDeregisterNodeDefaultValue((xmlNodePtr)cur);

    if (cur->children != NULL) {
  xmlNodePtr next, c = cur->children;

  /*
   * Cleanup all nodes which are not part of the specific lists
   * of notations, elements, attributes and entities.
   */
        while (c != NULL) {
      next = c->next;
      if ((c->type != XML_NOTATION_NODE) &&
          (c->type != XML_ELEMENT_DECL) &&
    (c->type != XML_ATTRIBUTE_DECL) &&
    (c->type != XML_ENTITY_DECL)) {
    xmlUnlinkNode(c);
    xmlFreeNode(c);
      }
      c = next;
  }
    }
    DICT_FREE(cur->name)
    DICT_FREE(cur->SystemID)
    DICT_FREE(cur->ExternalID)
    /* TODO !!! */
    if (cur->notations != NULL)
        xmlFreeNotationTable((xmlNotationTablePtr) cur->notations);

    if (cur->elements != NULL)
        xmlFreeElementTable((xmlElementTablePtr) cur->elements);
    if (cur->attributes != NULL)
        xmlFreeAttributeTable((xmlAttributeTablePtr) cur->attributes);
    if (cur->entities != NULL)
        xmlFreeEntitiesTable((xmlEntitiesTablePtr) cur->entities);
    if (cur->pentities != NULL)
        xmlFreeEntitiesTable((xmlEntitiesTablePtr) cur->pentities);

    xmlFree(cur);
}

/**
 * xmlNewDoc:
 * @version:  xmlChar string giving the version of XML "1.0"
 *
 * Creates a new XML document
 *
 * Returns a new document
 */
xmlDocPtr
xmlNewDoc(const xmlChar *version) {
    xmlDocPtr cur;

    if (version == NULL)
  version = (const xmlChar *) "1.0";

    /*
     * Allocate a new document and fill the fields.
     */
    cur = (xmlDocPtr) xmlMalloc(sizeof(xmlDoc));
    if (cur == NULL) {
  xmlTreeErrMemory("building doc");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlDoc));
    cur->type = XML_DOCUMENT_NODE;

    cur->version = xmlStrdup(version);
    if (cur->version == NULL) {
  xmlTreeErrMemory("building doc");
  xmlFree(cur);
  return(NULL);
    }
    cur->standalone = -1;
    cur->compression = -1; /* not initialized */
    cur->doc = cur;
    cur->parseFlags = 0;
    cur->properties = XML_DOC_USERBUILT;
    /*
     * The in memory encoding is always UTF8
     * This field will never change and would
     * be obsolete if not for binary compatibility.
     */
    cur->charset = XML_CHAR_ENCODING_UTF8;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlFreeDoc:
 * @cur:  pointer to the document
 *
 * Free up all the structures used by a document, tree included.
 */
void
xmlFreeDoc(xmlDocPtr cur) {
    xmlDtdPtr extSubset, intSubset;
    xmlDictPtr dict = NULL;

    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlFreeDoc : document == NULL\n");
#endif
  return;
    }

    if (cur != NULL) dict = cur->dict;

    if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
  xmlDeregisterNodeDefaultValue((xmlNodePtr)cur);

    /*
     * Do this before freeing the children list to avoid ID lookups
     */
    if (cur->ids != NULL) xmlFreeIDTable((xmlIDTablePtr) cur->ids);
    cur->ids = NULL;
    if (cur->refs != NULL) xmlFreeRefTable((xmlRefTablePtr) cur->refs);
    cur->refs = NULL;
    extSubset = cur->extSubset;
    intSubset = cur->intSubset;
    if (intSubset == extSubset)
  extSubset = NULL;
    if (extSubset != NULL) {
  xmlUnlinkNode((xmlNodePtr) cur->extSubset);
  cur->extSubset = NULL;
  xmlFreeDtd(extSubset);
    }
    if (intSubset != NULL) {
  xmlUnlinkNode((xmlNodePtr) cur->intSubset);
  cur->intSubset = NULL;
  xmlFreeDtd(intSubset);
    }

    if (cur->children != NULL) xmlFreeNodeList(cur->children);
    if (cur->oldNs != NULL) xmlFreeNsList(cur->oldNs);

    DICT_FREE(cur->version)
    DICT_FREE(cur->name)
    DICT_FREE(cur->encoding)
    DICT_FREE(cur->URL)
    xmlFree(cur);
    if (dict) xmlDictFree(dict);
}

/**
 * xmlStringLenGetNodeList:
 * @doc:  the document
 * @value:  the value of the text
 * @len:  the length of the string value
 *
 * Parse the value string and build the node list associated. Should
 * produce a flat tree with only TEXTs and ENTITY_REFs.
 * Returns a pointer to the first child
 */
xmlNodePtr
xmlStringLenGetNodeList(const xmlDoc *doc, const xmlChar *value, int len) {
    xmlNodePtr ret = NULL, last = NULL;
    xmlNodePtr node;
    xmlChar *val;
    const xmlChar *cur, *end;
    const xmlChar *q;
    xmlEntityPtr ent;
    xmlBufPtr buf;

    if (value == NULL) return(NULL);
    cur = value;
    end = cur + len;

    buf = xmlBufCreateSize(0);
    if (buf == NULL) return(NULL);
    xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);

    q = cur;
    while ((cur < end) && (*cur != 0)) {
  if (cur[0] == '&') {
      int charval = 0;
      xmlChar tmp;

      /*
       * Save the current text.
       */
            if (cur != q) {
    if (xmlBufAdd(buf, q, cur - q))
        goto out;
      }
      q = cur;
      if ((cur + 2 < end) && (cur[1] == '#') && (cur[2] == 'x')) {
    cur += 3;
    if (cur < end)
        tmp = *cur;
    else
        tmp = 0;
    while (tmp != ';') { /* Non input consuming loop */
                    /*
                     * If you find an integer overflow here when fuzzing,
                     * the bug is probably elsewhere. This function should
                     * only receive entities that were already validated by
                     * the parser, typically by xmlParseAttValueComplex
                     * calling xmlStringDecodeEntities.
                     *
                     * So it's better *not* to check for overflow to
                     * potentially discover new bugs.
                     */
        if ((tmp >= '0') && (tmp <= '9'))
      charval = charval * 16 + (tmp - '0');
        else if ((tmp >= 'a') && (tmp <= 'f'))
      charval = charval * 16 + (tmp - 'a') + 10;
        else if ((tmp >= 'A') && (tmp <= 'F'))
      charval = charval * 16 + (tmp - 'A') + 10;
        else {
      xmlTreeErr(XML_TREE_INVALID_HEX, (xmlNodePtr) doc,
                 NULL);
      charval = 0;
      break;
        }
        cur++;
        if (cur < end)
      tmp = *cur;
        else
      tmp = 0;
    }
    if (tmp == ';')
        cur++;
    q = cur;
      } else if ((cur + 1 < end) && (cur[1] == '#')) {
    cur += 2;
    if (cur < end)
        tmp = *cur;
    else
        tmp = 0;
    while (tmp != ';') { /* Non input consuming loops */
                    /* Don't check for integer overflow, see above. */
        if ((tmp >= '0') && (tmp <= '9'))
      charval = charval * 10 + (tmp - '0');
        else {
      xmlTreeErr(XML_TREE_INVALID_DEC, (xmlNodePtr) doc,
                 NULL);
      charval = 0;
      break;
        }
        cur++;
        if (cur < end)
      tmp = *cur;
        else
      tmp = 0;
    }
    if (tmp == ';')
        cur++;
    q = cur;
      } else {
    /*
     * Read the entity string
     */
    cur++;
    q = cur;
    while ((cur < end) && (*cur != 0) && (*cur != ';')) cur++;
    if ((cur >= end) || (*cur == 0)) {
        xmlTreeErr(XML_TREE_UNTERMINATED_ENTITY, (xmlNodePtr) doc,
                   (const char *) q);
        goto out;
    }
    if (cur != q) {
        /*
         * Predefined entities don't generate nodes
         */
        val = xmlStrndup(q, cur - q);
        ent = xmlGetDocEntity(doc, val);
        if ((ent != NULL) &&
      (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {

      if (xmlBufCat(buf, ent->content))
          goto out;

        } else {
      /*
       * Flush buffer so far
       */
      if (!xmlBufIsEmpty(buf)) {
          node = xmlNewDocText(doc, NULL);
          if (node == NULL) {
        if (val != NULL) xmlFree(val);
        goto out;
          }
          node->content = xmlBufDetach(buf);

          if (last == NULL) {
        last = ret = node;
          } else {
        last = xmlAddNextSibling(last, node);
          }
      }

      /*
       * Create a new REFERENCE_REF node
       */
      node = xmlNewReference(doc, val);
      if (node == NULL) {
          if (val != NULL) xmlFree(val);
          goto out;
      }
      else if ((ent != NULL) && (ent->children == NULL)) {
          xmlNodePtr temp;

                            /* Set to non-NULL value to avoid recursion. */
          ent->children = (xmlNodePtr) -1;
          ent->children = xmlStringGetNodeList(doc,
            (const xmlChar*)node->content);
          ent->owner = 1;
          temp = ent->children;
          while (temp) {
        temp->parent = (xmlNodePtr)ent;
        ent->last = temp;
        temp = temp->next;
          }
      }
      if (last == NULL) {
          last = ret = node;
      } else {
          last = xmlAddNextSibling(last, node);
      }
        }
        xmlFree(val);
    }
    cur++;
    q = cur;
      }
      if (charval != 0) {
    xmlChar buffer[10];
    int l;

    l = xmlCopyCharMultiByte(buffer, charval);
    buffer[l] = 0;

    if (xmlBufCat(buf, buffer))
        goto out;
    charval = 0;
      }
  } else
      cur++;
    }

    if (cur != q) {
        /*
   * Handle the last piece of text.
   */
  if (xmlBufAdd(buf, q, cur - q))
      goto out;
    }

    if (!xmlBufIsEmpty(buf)) {
  node = xmlNewDocText(doc, NULL);
  if (node == NULL) goto out;
  node->content = xmlBufDetach(buf);

  if (last == NULL) {
      ret = node;
  } else {
      xmlAddNextSibling(last, node);
  }
    } else if (ret == NULL) {
        ret = xmlNewDocText(doc, BAD_CAST "");
    }

out:
    xmlBufFree(buf);
    return(ret);
}

/**
 * xmlStringGetNodeList:
 * @doc:  the document
 * @value:  the value of the attribute
 *
 * Parse the value string and build the node list associated. Should
 * produce a flat tree with only TEXTs and ENTITY_REFs.
 * Returns a pointer to the first child
 */
xmlNodePtr
xmlStringGetNodeList(const xmlDoc *doc, const xmlChar *value) {
    xmlNodePtr ret = NULL, last = NULL;
    xmlNodePtr node;
    xmlChar *val;
    const xmlChar *cur = value;
    const xmlChar *q;
    xmlEntityPtr ent;
    xmlBufPtr buf;

    if (value == NULL) return(NULL);

    buf = xmlBufCreateSize(0);
    if (buf == NULL) return(NULL);
    xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);

    q = cur;
    while (*cur != 0) {
  if (cur[0] == '&') {
      int charval = 0;
      xmlChar tmp;

      /*
       * Save the current text.
       */
            if (cur != q) {
    if (xmlBufAdd(buf, q, cur - q))
        goto out;
      }
      q = cur;
      if ((cur[1] == '#') && (cur[2] == 'x')) {
    cur += 3;
    tmp = *cur;
    while (tmp != ';') { /* Non input consuming loop */
                    /* Don't check for integer overflow, see above. */
        if ((tmp >= '0') && (tmp <= '9'))
      charval = charval * 16 + (tmp - '0');
        else if ((tmp >= 'a') && (tmp <= 'f'))
      charval = charval * 16 + (tmp - 'a') + 10;
        else if ((tmp >= 'A') && (tmp <= 'F'))
      charval = charval * 16 + (tmp - 'A') + 10;
        else {
      xmlTreeErr(XML_TREE_INVALID_HEX, (xmlNodePtr) doc,
                 NULL);
      charval = 0;
      break;
        }
        cur++;
        tmp = *cur;
    }
    if (tmp == ';')
        cur++;
    q = cur;
      } else if  (cur[1] == '#') {
    cur += 2;
    tmp = *cur;
    while (tmp != ';') { /* Non input consuming loops */
                    /* Don't check for integer overflow, see above. */
        if ((tmp >= '0') && (tmp <= '9'))
      charval = charval * 10 + (tmp - '0');
        else {
      xmlTreeErr(XML_TREE_INVALID_DEC, (xmlNodePtr) doc,
                 NULL);
      charval = 0;
      break;
        }
        cur++;
        tmp = *cur;
    }
    if (tmp == ';')
        cur++;
    q = cur;
      } else {
    /*
     * Read the entity string
     */
    cur++;
    q = cur;
    while ((*cur != 0) && (*cur != ';')) cur++;
    if (*cur == 0) {
        xmlTreeErr(XML_TREE_UNTERMINATED_ENTITY,
                   (xmlNodePtr) doc, (const char *) q);
        goto out;
    }
    if (cur != q) {
        /*
         * Predefined entities don't generate nodes
         */
        val = xmlStrndup(q, cur - q);
        ent = xmlGetDocEntity(doc, val);
        if ((ent != NULL) &&
      (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {

      if (xmlBufCat(buf, ent->content))
          goto out;

        } else {
      /*
       * Flush buffer so far
       */
      if (!xmlBufIsEmpty(buf)) {
          node = xmlNewDocText(doc, NULL);
          if (node == NULL) {
        if (val != NULL) xmlFree(val);
        goto out;
          }
          node->content = xmlBufDetach(buf);

          if (last == NULL) {
        last = ret = node;
          } else {
        last = xmlAddNextSibling(last, node);
          }
      }

      /*
       * Create a new REFERENCE_REF node
       */
      node = xmlNewReference(doc, val);
      if (node == NULL) {
          if (val != NULL) xmlFree(val);
          goto out;
      }
      else if ((ent != NULL) && (ent->children == NULL)) {
          xmlNodePtr temp;

                            /* Set to non-NULL value to avoid recursion. */
          ent->children = (xmlNodePtr) -1;
          ent->children = xmlStringGetNodeList(doc,
            (const xmlChar*)node->content);
          ent->owner = 1;
          temp = ent->children;
          while (temp) {
        temp->parent = (xmlNodePtr)ent;
        ent->last = temp;
        temp = temp->next;
          }
      }
      if (last == NULL) {
          last = ret = node;
      } else {
          last = xmlAddNextSibling(last, node);
      }
        }
        xmlFree(val);
    }
    cur++;
    q = cur;
      }
      if (charval != 0) {
    xmlChar buffer[10];
    int len;

    len = xmlCopyCharMultiByte(buffer, charval);
    buffer[len] = 0;

    if (xmlBufCat(buf, buffer))
        goto out;
    charval = 0;
      }
  } else
      cur++;
    }
    if ((cur != q) || (ret == NULL)) {
        /*
   * Handle the last piece of text.
   */
  xmlBufAdd(buf, q, cur - q);
    }

    if (!xmlBufIsEmpty(buf)) {
  node = xmlNewDocText(doc, NULL);
        if (node == NULL) {
            xmlBufFree(buf);
            return(NULL);
        }
  node->content = xmlBufDetach(buf);

  if (last == NULL) {
      ret = node;
  } else {
      xmlAddNextSibling(last, node);
  }
    }

out:
    xmlBufFree(buf);
    return(ret);
}

/**
 * xmlNodeListGetString:
 * @doc:  the document
 * @list:  a Node list
 * @inLine:  should we replace entity contents or show their external form
 *
 * Build the string equivalent to the text contained in the Node list
 * made of TEXTs and ENTITY_REFs
 *
 * Returns a pointer to the string copy, the caller must free it with xmlFree().
 */
xmlChar *
xmlNodeListGetString(xmlDocPtr doc, const xmlNode *list, int inLine)
{
    const xmlNode *node = list;
    xmlChar *ret = NULL;
    xmlEntityPtr ent;
    int attr;

    if (list == NULL)
        return (NULL);
    if ((list->parent != NULL) && (list->parent->type == XML_ATTRIBUTE_NODE))
        attr = 1;
    else
        attr = 0;

    while (node != NULL) {
        if ((node->type == XML_TEXT_NODE) ||
            (node->type == XML_CDATA_SECTION_NODE)) {
            if (inLine) {
                ret = xmlStrcat(ret, node->content);
            } else {
                xmlChar *buffer;

    if (attr)
        buffer = xmlEncodeAttributeEntities(doc, node->content);
    else
        buffer = xmlEncodeEntitiesReentrant(doc, node->content);
                if (buffer != NULL) {
                    ret = xmlStrcat(ret, buffer);
                    xmlFree(buffer);
                }
            }
        } else if (node->type == XML_ENTITY_REF_NODE) {
            if (inLine) {
                ent = xmlGetDocEntity(doc, node->name);
                if (ent != NULL) {
                    xmlChar *buffer;

                    /* an entity content can be any "well balanced chunk",
                     * i.e. the result of the content [43] production:
                     * http://www.w3.org/TR/REC-xml#NT-content.
                     * So it can contain text, CDATA section or nested
                     * entity reference nodes (among others).
                     * -> we recursive  call xmlNodeListGetString()
                     * which handles these types */
                    buffer = xmlNodeListGetString(doc, ent->children, 1);
                    if (buffer != NULL) {
                        ret = xmlStrcat(ret, buffer);
                        xmlFree(buffer);
                    }
                } else {
                    ret = xmlStrcat(ret, node->content);
                }
            } else {
                xmlChar buf[2];

                buf[0] = '&';
                buf[1] = 0;
                ret = xmlStrncat(ret, buf, 1);
                ret = xmlStrcat(ret, node->name);
                buf[0] = ';';
                buf[1] = 0;
                ret = xmlStrncat(ret, buf, 1);
            }
        }
#if 0
        else {
            xmlGenericError(xmlGenericErrorContext,
                            "xmlGetNodeListString : invalid node type %d\n",
                            node->type);
        }
#endif
        node = node->next;
    }
    return (ret);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNodeListGetRawString:
 * @doc:  the document
 * @list:  a Node list
 * @inLine:  should we replace entity contents or show their external form
 *
 * Builds the string equivalent to the text contained in the Node list
 * made of TEXTs and ENTITY_REFs, contrary to xmlNodeListGetString()
 * this function doesn't do any character encoding handling.
 *
 * Returns a pointer to the string copy, the caller must free it with xmlFree().
 */
xmlChar *
xmlNodeListGetRawString(const xmlDoc *doc, const xmlNode *list, int inLine)
{
    const xmlNode *node = list;
    xmlChar *ret = NULL;
    xmlEntityPtr ent;

    if (list == NULL)
        return (NULL);

    while (node != NULL) {
        if ((node->type == XML_TEXT_NODE) ||
            (node->type == XML_CDATA_SECTION_NODE)) {
            if (inLine) {
                ret = xmlStrcat(ret, node->content);
            } else {
                xmlChar *buffer;

                buffer = xmlEncodeSpecialChars(doc, node->content);
                if (buffer != NULL) {
                    ret = xmlStrcat(ret, buffer);
                    xmlFree(buffer);
                }
            }
        } else if (node->type == XML_ENTITY_REF_NODE) {
            if (inLine) {
                ent = xmlGetDocEntity(doc, node->name);
                if (ent != NULL) {
                    xmlChar *buffer;

                    /* an entity content can be any "well balanced chunk",
                     * i.e. the result of the content [43] production:
                     * http://www.w3.org/TR/REC-xml#NT-content.
                     * So it can contain text, CDATA section or nested
                     * entity reference nodes (among others).
                     * -> we recursive  call xmlNodeListGetRawString()
                     * which handles these types */
                    buffer =
                        xmlNodeListGetRawString(doc, ent->children, 1);
                    if (buffer != NULL) {
                        ret = xmlStrcat(ret, buffer);
                        xmlFree(buffer);
                    }
                } else {
                    ret = xmlStrcat(ret, node->content);
                }
            } else {
                xmlChar buf[2];

                buf[0] = '&';
                buf[1] = 0;
                ret = xmlStrncat(ret, buf, 1);
                ret = xmlStrcat(ret, node->name);
                buf[0] = ';';
                buf[1] = 0;
                ret = xmlStrncat(ret, buf, 1);
            }
        }
#if 0
        else {
            xmlGenericError(xmlGenericErrorContext,
                            "xmlGetNodeListString : invalid node type %d\n",
                            node->type);
        }
#endif
        node = node->next;
    }
    return (ret);
}
#endif /* LIBXML_TREE_ENABLED */

static xmlAttrPtr
xmlNewPropInternal(xmlNodePtr node, xmlNsPtr ns,
                   const xmlChar * name, const xmlChar * value,
                   int eatname)
{
    xmlAttrPtr cur;
    xmlDocPtr doc = NULL;

    if ((node != NULL) && (node->type != XML_ELEMENT_NODE)) {
        if ((eatname == 1) &&
      ((node->doc == NULL) ||
       (!(xmlDictOwns(node->doc->dict, name)))))
            xmlFree((xmlChar *) name);
        return (NULL);
    }

    /*
     * Allocate a new property and fill the fields.
     */
    cur = (xmlAttrPtr) xmlMalloc(sizeof(xmlAttr));
    if (cur == NULL) {
        if ((eatname == 1) &&
      ((node == NULL) || (node->doc == NULL) ||
       (!(xmlDictOwns(node->doc->dict, name)))))
            xmlFree((xmlChar *) name);
        xmlTreeErrMemory("building attribute");
        return (NULL);
    }
    memset(cur, 0, sizeof(xmlAttr));
    cur->type = XML_ATTRIBUTE_NODE;

    cur->parent = node;
    if (node != NULL) {
        doc = node->doc;
        cur->doc = doc;
    }
    cur->ns = ns;

    if (eatname == 0) {
        if ((doc != NULL) && (doc->dict != NULL))
            cur->name = (xmlChar *) xmlDictLookup(doc->dict, name, -1);
        else
            cur->name = xmlStrdup(name);
    } else
        cur->name = name;

    if (value != NULL) {
        xmlNodePtr tmp;

        cur->children = xmlNewDocText(doc, value);
        cur->last = NULL;
        tmp = cur->children;
        while (tmp != NULL) {
            tmp->parent = (xmlNodePtr) cur;
            if (tmp->next == NULL)
                cur->last = tmp;
            tmp = tmp->next;
        }
    }

    /*
     * Add it at the end to preserve parsing order ...
     */
    if (node != NULL) {
        if (node->properties == NULL) {
            node->properties = cur;
        } else {
            xmlAttrPtr prev = node->properties;

            while (prev->next != NULL)
                prev = prev->next;
            prev->next = cur;
            cur->prev = prev;
        }
    }

    if ((value != NULL) && (node != NULL) &&
        (xmlIsID(node->doc, node, cur) == 1))
        xmlAddID(NULL, node->doc, value, cur);

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
        xmlRegisterNodeDefaultValue((xmlNodePtr) cur);
    return (cur);
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_HTML_ENABLED) || \
    defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlNewProp:
 * @node:  the holding node
 * @name:  the name of the attribute
 * @value:  the value of the attribute
 *
 * Create a new property carried by a node.
 * Returns a pointer to the attribute
 */
xmlAttrPtr
xmlNewProp(xmlNodePtr node, const xmlChar *name, const xmlChar *value) {

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewProp : name == NULL\n");
#endif
  return(NULL);
    }

  return xmlNewPropInternal(node, NULL, name, value, 0);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNewNsProp:
 * @node:  the holding node
 * @ns:  the namespace
 * @name:  the name of the attribute
 * @value:  the value of the attribute
 *
 * Create a new property tagged with a namespace and carried by a node.
 * Returns a pointer to the attribute
 */
xmlAttrPtr
xmlNewNsProp(xmlNodePtr node, xmlNsPtr ns, const xmlChar *name,
           const xmlChar *value) {

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewNsProp : name == NULL\n");
#endif
  return(NULL);
    }

    return xmlNewPropInternal(node, ns, name, value, 0);
}

/**
 * xmlNewNsPropEatName:
 * @node:  the holding node
 * @ns:  the namespace
 * @name:  the name of the attribute
 * @value:  the value of the attribute
 *
 * Create a new property tagged with a namespace and carried by a node.
 * Returns a pointer to the attribute
 */
xmlAttrPtr
xmlNewNsPropEatName(xmlNodePtr node, xmlNsPtr ns, xmlChar *name,
           const xmlChar *value) {

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewNsPropEatName : name == NULL\n");
#endif
  return(NULL);
    }

    return xmlNewPropInternal(node, ns, name, value, 1);
}

/**
 * xmlNewDocProp:
 * @doc:  the document
 * @name:  the name of the attribute
 * @value:  the value of the attribute
 *
 * Create a new property carried by a document.
 * NOTE: @value is supposed to be a piece of XML CDATA, so it allows entity
 *       references, but XML special chars need to be escaped first by using
 *       xmlEncodeEntitiesReentrant(). Use xmlNewProp() if you don't need
 *       entities support.
 *
 * Returns a pointer to the attribute
 */
xmlAttrPtr
xmlNewDocProp(xmlDocPtr doc, const xmlChar *name, const xmlChar *value) {
    xmlAttrPtr cur;

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewDocProp : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new property and fill the fields.
     */
    cur = (xmlAttrPtr) xmlMalloc(sizeof(xmlAttr));
    if (cur == NULL) {
  xmlTreeErrMemory("building attribute");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlAttr));
    cur->type = XML_ATTRIBUTE_NODE;

    if ((doc != NULL) && (doc->dict != NULL))
  cur->name = xmlDictLookup(doc->dict, name, -1);
    else
  cur->name = xmlStrdup(name);
    cur->doc = doc;
    if (value != NULL) {
  xmlNodePtr tmp;

  cur->children = xmlStringGetNodeList(doc, value);
  cur->last = NULL;

  tmp = cur->children;
  while (tmp != NULL) {
      tmp->parent = (xmlNodePtr) cur;
      if (tmp->next == NULL)
    cur->last = tmp;
      tmp = tmp->next;
  }
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlFreePropList:
 * @cur:  the first property in the list
 *
 * Free a property and all its siblings, all the children are freed too.
 */
void
xmlFreePropList(xmlAttrPtr cur) {
    xmlAttrPtr next;
    if (cur == NULL) return;
    while (cur != NULL) {
        next = cur->next;
        xmlFreeProp(cur);
  cur = next;
    }
}

/**
 * xmlFreeProp:
 * @cur:  an attribute
 *
 * Free one attribute, all the content is freed too
 */
void
xmlFreeProp(xmlAttrPtr cur) {
    xmlDictPtr dict = NULL;
    if (cur == NULL) return;

    if (cur->doc != NULL) dict = cur->doc->dict;

    if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
  xmlDeregisterNodeDefaultValue((xmlNodePtr)cur);

    /* Check for ID removal -> leading to invalid references ! */
    if ((cur->doc != NULL) && (cur->atype == XML_ATTRIBUTE_ID)) {
      xmlRemoveID(cur->doc, cur);
    }
    if (cur->children != NULL) xmlFreeNodeList(cur->children);
    DICT_FREE(cur->name)
    xmlFree(cur);
}

/**
 * xmlRemoveProp:
 * @cur:  an attribute
 *
 * Unlink and free one attribute, all the content is freed too
 * Note this doesn't work for namespace definition attributes
 *
 * Returns 0 if success and -1 in case of error.
 */
int
xmlRemoveProp(xmlAttrPtr cur) {
    xmlAttrPtr tmp;
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlRemoveProp : cur == NULL\n");
#endif
  return(-1);
    }
    if (cur->parent == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlRemoveProp : cur->parent == NULL\n");
#endif
  return(-1);
    }
    tmp = cur->parent->properties;
    if (tmp == cur) {
        cur->parent->properties = cur->next;
    if (cur->next != NULL)
      cur->next->prev = NULL;
  xmlFreeProp(cur);
  return(0);
    }
    while (tmp != NULL) {
  if (tmp->next == cur) {
      tmp->next = cur->next;
      if (tmp->next != NULL)
    tmp->next->prev = tmp;
      xmlFreeProp(cur);
      return(0);
  }
        tmp = tmp->next;
    }
#ifdef DEBUG_TREE
    xmlGenericError(xmlGenericErrorContext,
      "xmlRemoveProp : attribute not owned by its node\n");
#endif
    return(-1);
}

/**
 * xmlNewDocPI:
 * @doc:  the target document
 * @name:  the processing instruction name
 * @content:  the PI content
 *
 * Creation of a processing instruction element.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocPI(xmlDocPtr doc, const xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur;

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewPI : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building PI");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_PI_NODE;

    if ((doc != NULL) && (doc->dict != NULL))
        cur->name = xmlDictLookup(doc->dict, name, -1);
    else
  cur->name = xmlStrdup(name);
    if (content != NULL) {
  cur->content = xmlStrdup(content);
    }
    cur->doc = doc;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlNewPI:
 * @name:  the processing instruction name
 * @content:  the PI content
 *
 * Creation of a processing instruction element.
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocPI.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewPI(const xmlChar *name, const xmlChar *content) {
    return(xmlNewDocPI(NULL, name, content));
}

/**
 * xmlNewNode:
 * @ns:  namespace if any
 * @name:  the node name
 *
 * Creation of a new node element. @ns is optional (NULL).
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocNode.
 *
 * Returns a pointer to the new node object. Uses xmlStrdup() to make
 * copy of @name.
 */
xmlNodePtr
xmlNewNode(xmlNsPtr ns, const xmlChar *name) {
    xmlNodePtr cur;

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewNode : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building node");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_ELEMENT_NODE;

    cur->name = xmlStrdup(name);
    cur->ns = ns;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewNodeEatName:
 * @ns:  namespace if any
 * @name:  the node name
 *
 * Creation of a new node element. @ns is optional (NULL).
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocNodeEatName.
 *
 * Returns a pointer to the new node object, with pointer @name as
 * new node's name. Use xmlNewNode() if a copy of @name string is
 * is needed as new node's name.
 */
xmlNodePtr
xmlNewNodeEatName(xmlNsPtr ns, xmlChar *name) {
    xmlNodePtr cur;

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewNode : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building node");
  /* we can't check here that name comes from the doc dictionary */
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_ELEMENT_NODE;

    cur->name = name;
    cur->ns = ns;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlNewDocNode:
 * @doc:  the document
 * @ns:  namespace if any
 * @name:  the node name
 * @content:  the XML text content if any
 *
 * Creation of a new node element within a document. @ns and @content
 * are optional (NULL).
 * NOTE: @content is supposed to be a piece of XML CDATA, so it allow entities
 *       references, but XML special chars need to be escaped first by using
 *       xmlEncodeEntitiesReentrant(). Use xmlNewDocRawNode() if you don't
 *       need entities support.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocNode(xmlDocPtr doc, xmlNsPtr ns,
              const xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur;

    if ((doc != NULL) && (doc->dict != NULL))
        cur = xmlNewNodeEatName(ns, (xmlChar *)
                          xmlDictLookup(doc->dict, name, -1));
    else
  cur = xmlNewNode(ns, name);
    if (cur != NULL) {
        cur->doc = doc;
  if (content != NULL) {
      cur->children = xmlStringGetNodeList(doc, content);
      UPDATE_LAST_CHILD_AND_PARENT(cur)
  }
    }

    return(cur);
}

/**
 * xmlNewDocNodeEatName:
 * @doc:  the document
 * @ns:  namespace if any
 * @name:  the node name
 * @content:  the XML text content if any
 *
 * Creation of a new node element within a document. @ns and @content
 * are optional (NULL).
 * NOTE: @content is supposed to be a piece of XML CDATA, so it allow entities
 *       references, but XML special chars need to be escaped first by using
 *       xmlEncodeEntitiesReentrant(). Use xmlNewDocRawNode() if you don't
 *       need entities support.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocNodeEatName(xmlDocPtr doc, xmlNsPtr ns,
              xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur;

    cur = xmlNewNodeEatName(ns, name);
    if (cur != NULL) {
        cur->doc = doc;
  if (content != NULL) {
      cur->children = xmlStringGetNodeList(doc, content);
      UPDATE_LAST_CHILD_AND_PARENT(cur)
  }
    } else {
        /* if name don't come from the doc dictionary free it here */
        if ((name != NULL) && (doc != NULL) &&
      (!(xmlDictOwns(doc->dict, name))))
      xmlFree(name);
    }
    return(cur);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNewDocRawNode:
 * @doc:  the document
 * @ns:  namespace if any
 * @name:  the node name
 * @content:  the text content if any
 *
 * Creation of a new node element within a document. @ns and @content
 * are optional (NULL).
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocRawNode(xmlDocPtr doc, xmlNsPtr ns,
                 const xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur;

    cur = xmlNewDocNode(doc, ns, name, NULL);
    if (cur != NULL) {
        cur->doc = doc;
  if (content != NULL) {
      cur->children = xmlNewDocText(doc, content);
      UPDATE_LAST_CHILD_AND_PARENT(cur)
  }
    }
    return(cur);
}

/**
 * xmlNewDocFragment:
 * @doc:  the document owning the fragment
 *
 * Creation of a new Fragment node.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocFragment(xmlDocPtr doc) {
    xmlNodePtr cur;

    /*
     * Allocate a new DocumentFragment node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building fragment");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_DOCUMENT_FRAG_NODE;

    cur->doc = doc;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNewText:
 * @content:  the text content
 *
 * Creation of a new text node.
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocText.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewText(const xmlChar *content) {
    xmlNodePtr cur;

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building text");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_TEXT_NODE;

    cur->name = xmlStringText;
    if (content != NULL) {
  cur->content = xmlStrdup(content);
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNewTextChild:
 * @parent:  the parent node
 * @ns:  a namespace if any
 * @name:  the name of the child
 * @content:  the text content of the child if any.
 *
 * Creation of a new child element, added at the end of @parent children list.
 * @ns and @content parameters are optional (NULL). If @ns is NULL, the newly
 * created element inherits the namespace of @parent. If @content is non NULL,
 * a child TEXT node will be created containing the string @content.
 * NOTE: Use xmlNewChild() if @content will contain entities that need to be
 * preserved. Use this function, xmlNewTextChild(), if you need to ensure that
 * reserved XML chars that might appear in @content, such as the ampersand,
 * greater-than or less-than signs, are automatically replaced by their XML
 * escaped entity representations.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewTextChild(xmlNodePtr parent, xmlNsPtr ns,
            const xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur, prev;

    if (parent == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewTextChild : parent == NULL\n");
#endif
  return(NULL);
    }

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewTextChild : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new node
     */
    if (parent->type == XML_ELEMENT_NODE) {
  if (ns == NULL)
      cur = xmlNewDocRawNode(parent->doc, parent->ns, name, content);
  else
      cur = xmlNewDocRawNode(parent->doc, ns, name, content);
    } else if ((parent->type == XML_DOCUMENT_NODE) ||
         (parent->type == XML_HTML_DOCUMENT_NODE)) {
  if (ns == NULL)
      cur = xmlNewDocRawNode((xmlDocPtr) parent, NULL, name, content);
  else
      cur = xmlNewDocRawNode((xmlDocPtr) parent, ns, name, content);
    } else if (parent->type == XML_DOCUMENT_FRAG_NODE) {
      cur = xmlNewDocRawNode( parent->doc, ns, name, content);
    } else {
  return(NULL);
    }
    if (cur == NULL) return(NULL);

    /*
     * add the new element at the end of the children list.
     */
    cur->type = XML_ELEMENT_NODE;
    cur->parent = parent;
    cur->doc = parent->doc;
    if (parent->children == NULL) {
        parent->children = cur;
  parent->last = cur;
    } else {
        prev = parent->last;
  prev->next = cur;
  cur->prev = prev;
  parent->last = cur;
    }

    return(cur);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNewCharRef:
 * @doc: the document
 * @name:  the char ref string, starting with # or "&# ... ;"
 *
 * Creation of a new character reference node.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewCharRef(xmlDocPtr doc, const xmlChar *name) {
    xmlNodePtr cur;

    if (name == NULL)
        return(NULL);

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building character reference");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_ENTITY_REF_NODE;

    cur->doc = doc;
    if (name[0] == '&') {
        int len;
        name++;
  len = xmlStrlen(name);
  if (name[len - 1] == ';')
      cur->name = xmlStrndup(name, len - 1);
  else
      cur->name = xmlStrndup(name, len);
    } else
  cur->name = xmlStrdup(name);

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewReference:
 * @doc: the document
 * @name:  the reference name, or the reference string with & and ;
 *
 * Creation of a new reference node.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewReference(const xmlDoc *doc, const xmlChar *name) {
    xmlNodePtr cur;
    xmlEntityPtr ent;

    if (name == NULL)
        return(NULL);

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building reference");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_ENTITY_REF_NODE;

    cur->doc = (xmlDoc *)doc;
    if (name[0] == '&') {
        int len;
        name++;
  len = xmlStrlen(name);
  if (name[len - 1] == ';')
      cur->name = xmlStrndup(name, len - 1);
  else
      cur->name = xmlStrndup(name, len);
    } else
  cur->name = xmlStrdup(name);

    ent = xmlGetDocEntity(doc, cur->name);
    if (ent != NULL) {
  cur->content = ent->content;
  /*
   * The parent pointer in entity is a DTD pointer and thus is NOT
   * updated.  Not sure if this is 100% correct.
   *  -George
   */
  cur->children = (xmlNodePtr) ent;
  cur->last = (xmlNodePtr) ent;
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewDocText:
 * @doc: the document
 * @content:  the text content
 *
 * Creation of a new text node within a document.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocText(const xmlDoc *doc, const xmlChar *content) {
    xmlNodePtr cur;

    cur = xmlNewText(content);
    if (cur != NULL) cur->doc = (xmlDoc *)doc;
    return(cur);
}

/**
 * xmlNewTextLen:
 * @content:  the text content
 * @len:  the text len.
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocTextLen.
 *
 * Creation of a new text node with an extra parameter for the content's length
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewTextLen(const xmlChar *content, int len) {
    xmlNodePtr cur;

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building text");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_TEXT_NODE;

    cur->name = xmlStringText;
    if (content != NULL) {
  cur->content = xmlStrndup(content, len);
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewDocTextLen:
 * @doc: the document
 * @content:  the text content
 * @len:  the text len.
 *
 * Creation of a new text node with an extra content length parameter. The
 * text node pertain to a given document.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocTextLen(xmlDocPtr doc, const xmlChar *content, int len) {
    xmlNodePtr cur;

    cur = xmlNewTextLen(content, len);
    if (cur != NULL) cur->doc = doc;
    return(cur);
}

/**
 * xmlNewComment:
 * @content:  the comment content
 *
 * Use of this function is DISCOURAGED in favor of xmlNewDocComment.
 *
 * Creation of a new node containing a comment.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewComment(const xmlChar *content) {
    xmlNodePtr cur;

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building comment");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_COMMENT_NODE;

    cur->name = xmlStringComment;
    if (content != NULL) {
  cur->content = xmlStrdup(content);
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewCDataBlock:
 * @doc:  the document
 * @content:  the CDATA block content content
 * @len:  the length of the block
 *
 * Creation of a new node containing a CDATA block.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewCDataBlock(xmlDocPtr doc, const xmlChar *content, int len) {
    xmlNodePtr cur;

    /*
     * Allocate a new node and fill the fields.
     */
    cur = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (cur == NULL) {
  xmlTreeErrMemory("building CDATA");
  return(NULL);
    }
    memset(cur, 0, sizeof(xmlNode));
    cur->type = XML_CDATA_SECTION_NODE;
    cur->doc = doc;

    if (content != NULL) {
  cur->content = xmlStrndup(content, len);
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
  xmlRegisterNodeDefaultValue(cur);
    return(cur);
}

/**
 * xmlNewDocComment:
 * @doc:  the document
 * @content:  the comment content
 *
 * Creation of a new node containing a comment within a document.
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewDocComment(xmlDocPtr doc, const xmlChar *content) {
    xmlNodePtr cur;

    cur = xmlNewComment(content);
    if (cur != NULL) cur->doc = doc;
    return(cur);
}

static const xmlChar *_copyStringForNewDictIfNeeded(xmlDictPtr oldDict, xmlDictPtr newDict, const xmlChar *oldValue) {
    const xmlChar *newValue = oldValue;
    if (oldValue) {
        int oldDictOwnsOldValue = oldDict && (xmlDictOwns(oldDict, oldValue) == 1);
        if (oldDictOwnsOldValue) {
            if (newDict)
                newValue = xmlDictLookup(newDict, oldValue, -1);
            else
                newValue = xmlStrdup(oldValue);
        }
    }
    return newValue;
}

/**
 * xmlSetTreeDoc:
 * @tree:  the top element
 * @doc:  the document
 *
 * update all nodes under the tree to point to the right document
 */
void
xmlSetTreeDoc(xmlNodePtr tree, xmlDocPtr doc) {
    xmlAttrPtr prop;

    if ((tree == NULL) || (tree->type == XML_NAMESPACE_DECL))
  return;
    if (tree->doc != doc) {
        xmlDictPtr oldTreeDict = tree->doc ? tree->doc->dict : NULL;
        xmlDictPtr newDict = doc ? doc->dict : NULL;

  if(tree->type == XML_ELEMENT_NODE) {
      prop = tree->properties;
      while (prop != NULL) {
                if (prop->atype == XML_ATTRIBUTE_ID) {
                    xmlRemoveID(tree->doc, prop);
                }

                if (prop->doc != doc) {
                    xmlDictPtr oldPropDict = prop->doc ? prop->doc->dict : NULL;
                    prop->name = _copyStringForNewDictIfNeeded(oldPropDict, newDict, prop->name);
                    prop->doc = doc;
                }
    xmlSetListDoc(prop->children, doc);

                /*
                 * TODO: ID attributes should be also added to the new
                 * document, but this breaks things like xmlReplaceNode.
                 * The underlying problem is that xmlRemoveID is only called
                 * if a node is destroyed, not if it's unlinked.
                 */
#if 0
                if (xmlIsID(doc, tree, prop)) {
                    xmlChar *idVal = xmlNodeListGetString(doc, prop->children,
                                                          1);
                    xmlAddID(NULL, doc, idVal, prop);
                }
#endif

    prop = prop->next;
      }
  }
        if (tree->type == XML_ENTITY_REF_NODE) {
            /*
             * Clear 'children' which points to the entity declaration
             * from the original document.
             */
            tree->children = NULL;
        } else if (tree->children != NULL) {
      xmlSetListDoc(tree->children, doc);
        }

        tree->name = _copyStringForNewDictIfNeeded(oldTreeDict, newDict, tree->name);
        tree->content = (xmlChar *)_copyStringForNewDictIfNeeded(oldTreeDict, NULL, tree->content);
        /* FIXME: tree->ns should be updated as in xmlStaticCopyNode(). */
  tree->doc = doc;
    }
}

/**
 * xmlSetListDoc:
 * @list:  the first element
 * @doc:  the document
 *
 * update all nodes in the list to point to the right document
 */
void
xmlSetListDoc(xmlNodePtr list, xmlDocPtr doc) {
    xmlNodePtr cur;

    if ((list == NULL) || (list->type == XML_NAMESPACE_DECL))
  return;
    cur = list;
    while (cur != NULL) {
  if (cur->doc != doc)
      xmlSetTreeDoc(cur, doc);
  cur = cur->next;
    }
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlNewChild:
 * @parent:  the parent node
 * @ns:  a namespace if any
 * @name:  the name of the child
 * @content:  the XML content of the child if any.
 *
 * Creation of a new child element, added at the end of @parent children list.
 * @ns and @content parameters are optional (NULL). If @ns is NULL, the newly
 * created element inherits the namespace of @parent. If @content is non NULL,
 * a child list containing the TEXTs and ENTITY_REFs node will be created.
 * NOTE: @content is supposed to be a piece of XML CDATA, so it allows entity
 *       references. XML special chars must be escaped first by using
 *       xmlEncodeEntitiesReentrant(), or xmlNewTextChild() should be used.
 *
 * Returns a pointer to the new node object.
 */
xmlNodePtr
xmlNewChild(xmlNodePtr parent, xmlNsPtr ns,
            const xmlChar *name, const xmlChar *content) {
    xmlNodePtr cur, prev;

    if (parent == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewChild : parent == NULL\n");
#endif
  return(NULL);
    }

    if (name == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewChild : name == NULL\n");
#endif
  return(NULL);
    }

    /*
     * Allocate a new node
     */
    if (parent->type == XML_ELEMENT_NODE) {
  if (ns == NULL)
      cur = xmlNewDocNode(parent->doc, parent->ns, name, content);
  else
      cur = xmlNewDocNode(parent->doc, ns, name, content);
    } else if ((parent->type == XML_DOCUMENT_NODE) ||
         (parent->type == XML_HTML_DOCUMENT_NODE)) {
  if (ns == NULL)
      cur = xmlNewDocNode((xmlDocPtr) parent, NULL, name, content);
  else
      cur = xmlNewDocNode((xmlDocPtr) parent, ns, name, content);
    } else if (parent->type == XML_DOCUMENT_FRAG_NODE) {
      cur = xmlNewDocNode( parent->doc, ns, name, content);
    } else {
  return(NULL);
    }
    if (cur == NULL) return(NULL);

    /*
     * add the new element at the end of the children list.
     */
    cur->type = XML_ELEMENT_NODE;
    cur->parent = parent;
    cur->doc = parent->doc;
    if (parent->children == NULL) {
        parent->children = cur;
  parent->last = cur;
    } else {
        prev = parent->last;
  prev->next = cur;
  cur->prev = prev;
  parent->last = cur;
    }

    return(cur);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlAddPropSibling:
 * @prev:  the attribute to which @prop is added after
 * @cur:   the base attribute passed to calling function
 * @prop:  the new attribute
 *
 * Add a new attribute after @prev using @cur as base attribute.
 * When inserting before @cur, @prev is passed as @cur->prev.
 * When inserting after @cur, @prev is passed as @cur.
 * If an existing attribute is found it is destroyed prior to adding @prop.
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the attribute being inserted or NULL in case of error.
 */
static xmlNodePtr
xmlAddPropSibling(xmlNodePtr prev, xmlNodePtr cur, xmlNodePtr prop) {
  xmlAttrPtr attr;

  if ((cur == NULL) || (cur->type != XML_ATTRIBUTE_NODE) ||
      (prop == NULL) || (prop->type != XML_ATTRIBUTE_NODE) ||
      ((prev != NULL) && (prev->type != XML_ATTRIBUTE_NODE)))
    return(NULL);

  /* check if an attribute with the same name exists */
  if (prop->ns == NULL)
    attr = xmlHasNsProp(cur->parent, prop->name, NULL);
  else
    attr = xmlHasNsProp(cur->parent, prop->name, prop->ns->href);

  if (prop->doc != cur->doc) {
    xmlSetTreeDoc(prop, cur->doc);
  }
  prop->parent = cur->parent;
  prop->prev = prev;
  if (prev != NULL) {
    prop->next = prev->next;
    prev->next = prop;
    if (prop->next)
      prop->next->prev = prop;
  } else {
    prop->next = cur;
    cur->prev = prop;
  }
  if (prop->prev == NULL && prop->parent != NULL)
    prop->parent->properties = (xmlAttrPtr) prop;
  if ((attr != NULL) && (attr->type != XML_ATTRIBUTE_DECL)) {
    /* different instance, destroy it (attributes must be unique) */
    xmlRemoveProp((xmlAttrPtr) attr);
  }
  return prop;
}

/**
 * xmlAddNextSibling:
 * @cur:  the child node
 * @elem:  the new node
 *
 * Add a new node @elem as the next sibling of @cur
 * If the new node was already inserted in a document it is
 * first unlinked from its existing context.
 * As a result of text merging @elem may be freed.
 * If the new node is ATTRIBUTE, it is added into properties instead of children.
 * If there is an attribute with equal name, it is first destroyed.
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the new node or NULL in case of error.
 */
xmlNodePtr
xmlAddNextSibling(xmlNodePtr cur, xmlNodePtr elem) {
    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddNextSibling : cur == NULL\n");
#endif
  return(NULL);
    }
    if ((elem == NULL) || (elem->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddNextSibling : elem == NULL\n");
#endif
  return(NULL);
    }

    if (cur == elem) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddNextSibling : cur == elem\n");
#endif
  return(NULL);
    }

    xmlUnlinkNode(elem);

    if (elem->type == XML_TEXT_NODE) {
  if (cur->type == XML_TEXT_NODE) {
      xmlNodeAddContent(cur, elem->content);
      xmlFreeNode(elem);
      return(cur);
  }
  if ((cur->next != NULL) && (cur->next->type == XML_TEXT_NODE) &&
            (cur->name == cur->next->name)) {
      xmlChar *tmp;

      tmp = xmlStrdup(elem->content);
      tmp = xmlStrcat(tmp, cur->next->content);
      xmlNodeSetContent(cur->next, tmp);
      xmlFree(tmp);
      xmlFreeNode(elem);
      return(cur->next);
  }
    } else if (elem->type == XML_ATTRIBUTE_NODE) {
    return xmlAddPropSibling(cur, cur, elem);
    }

    if (elem->doc != cur->doc) {
  xmlSetTreeDoc(elem, cur->doc);
    }
    elem->parent = cur->parent;
    elem->prev = cur;
    elem->next = cur->next;
    cur->next = elem;
    if (elem->next != NULL)
  elem->next->prev = elem;
    if ((elem->parent != NULL) && (elem->parent->last == cur))
  elem->parent->last = elem;
    return(elem);
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_HTML_ENABLED) || \
    defined(LIBXML_SCHEMAS_ENABLED) || defined(LIBXML_XINCLUDE_ENABLED)
/**
 * xmlAddPrevSibling:
 * @cur:  the child node
 * @elem:  the new node
 *
 * Add a new node @elem as the previous sibling of @cur
 * merging adjacent TEXT nodes (@elem may be freed)
 * If the new node was already inserted in a document it is
 * first unlinked from its existing context.
 * If the new node is ATTRIBUTE, it is added into properties instead of children.
 * If there is an attribute with equal name, it is first destroyed.
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the new node or NULL in case of error.
 */
xmlNodePtr
xmlAddPrevSibling(xmlNodePtr cur, xmlNodePtr elem) {
    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddPrevSibling : cur == NULL\n");
#endif
  return(NULL);
    }
    if ((elem == NULL) || (elem->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddPrevSibling : elem == NULL\n");
#endif
  return(NULL);
    }

    if (cur == elem) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddPrevSibling : cur == elem\n");
#endif
  return(NULL);
    }

    xmlUnlinkNode(elem);

    if (elem->type == XML_TEXT_NODE) {
  if (cur->type == XML_TEXT_NODE) {
      xmlChar *tmp;

      tmp = xmlStrdup(elem->content);
      tmp = xmlStrcat(tmp, cur->content);
      xmlNodeSetContent(cur, tmp);
      xmlFree(tmp);
      xmlFreeNode(elem);
      return(cur);
  }
  if ((cur->prev != NULL) && (cur->prev->type == XML_TEXT_NODE) &&
            (cur->name == cur->prev->name)) {
      xmlNodeAddContent(cur->prev, elem->content);
      xmlFreeNode(elem);
      return(cur->prev);
  }
    } else if (elem->type == XML_ATTRIBUTE_NODE) {
    return xmlAddPropSibling(cur->prev, cur, elem);
    }

    if (elem->doc != cur->doc) {
  xmlSetTreeDoc(elem, cur->doc);
    }
    elem->parent = cur->parent;
    elem->next = cur;
    elem->prev = cur->prev;
    cur->prev = elem;
    if (elem->prev != NULL)
  elem->prev->next = elem;
    if ((elem->parent != NULL) && (elem->parent->children == cur)) {
    elem->parent->children = elem;
    }
    return(elem);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlAddSibling:
 * @cur:  the child node
 * @elem:  the new node
 *
 * Add a new element @elem to the list of siblings of @cur
 * merging adjacent TEXT nodes (@elem may be freed)
 * If the new element was already inserted in a document it is
 * first unlinked from its existing context.
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the new element or NULL in case of error.
 */
xmlNodePtr
xmlAddSibling(xmlNodePtr cur, xmlNodePtr elem) {
    xmlNodePtr parent;

    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddSibling : cur == NULL\n");
#endif
  return(NULL);
    }

    if ((elem == NULL) || (elem->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddSibling : elem == NULL\n");
#endif
  return(NULL);
    }

    if (cur == elem) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddSibling : cur == elem\n");
#endif
  return(NULL);
    }

    /*
     * Constant time is we can rely on the ->parent->last to find
     * the last sibling.
     */
    if ((cur->type != XML_ATTRIBUTE_NODE) && (cur->parent != NULL) &&
  (cur->parent->children != NULL) &&
  (cur->parent->last != NULL) &&
  (cur->parent->last->next == NULL)) {
  cur = cur->parent->last;
    } else {
  while (cur->next != NULL) cur = cur->next;
    }

    xmlUnlinkNode(elem);

    if ((cur->type == XML_TEXT_NODE) && (elem->type == XML_TEXT_NODE) &&
        (cur->name == elem->name)) {
  xmlNodeAddContent(cur, elem->content);
  xmlFreeNode(elem);
  return(cur);
    } else if (elem->type == XML_ATTRIBUTE_NODE) {
    return xmlAddPropSibling(cur, cur, elem);
    }

    if (elem->doc != cur->doc) {
  xmlSetTreeDoc(elem, cur->doc);
    }
    parent = cur->parent;
    elem->prev = cur;
    elem->next = NULL;
    elem->parent = parent;
    cur->next = elem;
    if (parent != NULL)
  parent->last = elem;

    return(elem);
}

/**
 * xmlAddChildList:
 * @parent:  the parent node
 * @cur:  the first node in the list
 *
 * Add a list of node at the end of the child list of the parent
 * merging adjacent TEXT nodes (@cur may be freed)
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the last child or NULL in case of error.
 */
xmlNodePtr
xmlAddChildList(xmlNodePtr parent, xmlNodePtr cur) {
    xmlNodePtr prev;

    if ((parent == NULL) || (parent->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddChildList : parent == NULL\n");
#endif
  return(NULL);
    }

    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddChildList : child == NULL\n");
#endif
  return(NULL);
    }

    if ((cur->doc != NULL) && (parent->doc != NULL) &&
        (cur->doc != parent->doc)) {
#ifdef DEBUG_TREE
  xmlGenericError(xmlGenericErrorContext,
    "Elements moved to a different document\n");
#endif
    }

    /*
     * add the first element at the end of the children list.
     */

    if (parent->children == NULL) {
        parent->children = cur;
    } else {
  /*
   * If cur and parent->last both are TEXT nodes, then merge them.
   */
  if ((cur->type == XML_TEXT_NODE) &&
      (parent->last->type == XML_TEXT_NODE) &&
      (cur->name == parent->last->name)) {
      xmlNodeAddContent(parent->last, cur->content);
      /*
       * if it's the only child, nothing more to be done.
       */
      if (cur->next == NULL) {
    xmlFreeNode(cur);
    return(parent->last);
      }
      prev = cur;
      cur = cur->next;
      xmlFreeNode(prev);
  }
        prev = parent->last;
  prev->next = cur;
  cur->prev = prev;
    }
    while (cur->next != NULL) {
  cur->parent = parent;
  if (cur->doc != parent->doc) {
      xmlSetTreeDoc(cur, parent->doc);
  }
        cur = cur->next;
    }
    cur->parent = parent;
    /* the parent may not be linked to a doc ! */
    if (cur->doc != parent->doc) {
        xmlSetTreeDoc(cur, parent->doc);
    }
    parent->last = cur;

    return(cur);
}

/**
 * xmlAddChild:
 * @parent:  the parent node
 * @cur:  the child node
 *
 * Add a new node to @parent, at the end of the child (or property) list
 * merging adjacent TEXT nodes (in which case @cur is freed)
 * If the new node is ATTRIBUTE, it is added into properties instead of children.
 * If there is an attribute with equal name, it is first destroyed.
 *
 * All tree manipulation functions can safely move nodes within a document.
 * But when moving nodes from one document to another, references to
 * namespaces in element or attribute nodes are NOT fixed. In this case,
 * you MUST call xmlReconciliateNs after the move operation to avoid
 * memory errors.
 *
 * Returns the child or NULL in case of error.
 */
xmlNodePtr
xmlAddChild(xmlNodePtr parent, xmlNodePtr cur) {
    xmlNodePtr prev;

    if ((parent == NULL) || (parent->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddChild : parent == NULL\n");
#endif
  return(NULL);
    }

    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddChild : child == NULL\n");
#endif
  return(NULL);
    }

    if (parent == cur) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlAddChild : parent == cur\n");
#endif
  return(NULL);
    }
    /*
     * If cur is a TEXT node, merge its content with adjacent TEXT nodes
     * cur is then freed.
     */
    if (cur->type == XML_TEXT_NODE) {
  if ((parent->type == XML_TEXT_NODE) &&
      (parent->content != NULL) &&
      (parent->name == cur->name)) {
      xmlNodeAddContent(parent, cur->content);
      xmlFreeNode(cur);
      return(parent);
  }
  if ((parent->last != NULL) && (parent->last->type == XML_TEXT_NODE) &&
      (parent->last->name == cur->name) &&
      (parent->last != cur)) {
      xmlNodeAddContent(parent->last, cur->content);
      xmlFreeNode(cur);
      return(parent->last);
  }
    }

    /*
     * add the new element at the end of the children list.
     */
    prev = cur->parent;
    cur->parent = parent;
    if (cur->doc != parent->doc) {
  xmlSetTreeDoc(cur, parent->doc);
    }
    /* this check prevents a loop on tree-traversions if a developer
     * tries to add a node to its parent multiple times
     */
    if (prev == parent)
  return(cur);

    /*
     * Coalescing
     */
    if ((parent->type == XML_TEXT_NODE) &&
  (parent->content != NULL) &&
  (parent != cur)) {
  xmlNodeAddContent(parent, cur->content);
  xmlFreeNode(cur);
  return(parent);
    }
    if (cur->type == XML_ATTRIBUTE_NODE) {
    if (parent->type != XML_ELEMENT_NODE)
      return(NULL);
  if (parent->properties != NULL) {
      /* check if an attribute with the same name exists */
      xmlAttrPtr lastattr;

      if (cur->ns == NULL)
    lastattr = xmlHasNsProp(parent, cur->name, NULL);
      else
    lastattr = xmlHasNsProp(parent, cur->name, cur->ns->href);
      if ((lastattr != NULL) && (lastattr != (xmlAttrPtr) cur) && (lastattr->type != XML_ATTRIBUTE_DECL)) {
    /* different instance, destroy it (attributes must be unique) */
      xmlUnlinkNode((xmlNodePtr) lastattr);
    xmlFreeProp(lastattr);
      }
    if (lastattr == (xmlAttrPtr) cur)
      return(cur);

  }
  if (parent->properties == NULL) {
      parent->properties = (xmlAttrPtr) cur;
  } else {
      /* find the end */
      xmlAttrPtr lastattr = parent->properties;
      while (lastattr->next != NULL) {
    lastattr = lastattr->next;
      }
      lastattr->next = (xmlAttrPtr) cur;
      ((xmlAttrPtr) cur)->prev = lastattr;
  }
    } else {
  if (parent->children == NULL) {
      parent->children = cur;
      parent->last = cur;
  } else {
      prev = parent->last;
      prev->next = cur;
      cur->prev = prev;
      parent->last = cur;
  }
    }
    return(cur);
}

/**
 * xmlGetLastChild:
 * @parent:  the parent node
 *
 * Search the last child of a node.
 * Returns the last child or NULL if none.
 */
xmlNodePtr
xmlGetLastChild(const xmlNode *parent) {
    if ((parent == NULL) || (parent->type == XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlGetLastChild : parent == NULL\n");
#endif
  return(NULL);
    }
    return(parent->last);
}

#ifdef LIBXML_TREE_ENABLED
/*
 * 5 interfaces from DOM ElementTraversal
 */

/**
 * xmlChildElementCount:
 * @parent: the parent node
 *
 * Finds the current number of child nodes of that element which are
 * element nodes.
 * Note the handling of entities references is different than in
 * the W3C DOM element traversal spec since we don't have back reference
 * from entities content to entities references.
 *
 * Returns the count of element child or 0 if not available
 */
unsigned long
xmlChildElementCount(xmlNodePtr parent) {
    unsigned long ret = 0;
    xmlNodePtr cur = NULL;

    if (parent == NULL)
        return(0);
    switch (parent->type) {
        case XML_ELEMENT_NODE:
        case XML_ENTITY_NODE:
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_HTML_DOCUMENT_NODE:
            cur = parent->children;
            break;
        default:
            return(0);
    }
    while (cur != NULL) {
        if (cur->type == XML_ELEMENT_NODE)
            ret++;
        cur = cur->next;
    }
    return(ret);
}

/**
 * xmlFirstElementChild:
 * @parent: the parent node
 *
 * Finds the first child node of that element which is a Element node
 * Note the handling of entities references is different than in
 * the W3C DOM element traversal spec since we don't have back reference
 * from entities content to entities references.
 *
 * Returns the first element child or NULL if not available
 */
xmlNodePtr
xmlFirstElementChild(xmlNodePtr parent) {
    xmlNodePtr cur = NULL;

    if (parent == NULL)
        return(NULL);
    switch (parent->type) {
        case XML_ELEMENT_NODE:
        case XML_ENTITY_NODE:
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_HTML_DOCUMENT_NODE:
            cur = parent->children;
            break;
        default:
            return(NULL);
    }
    while (cur != NULL) {
        if (cur->type == XML_ELEMENT_NODE)
            return(cur);
        cur = cur->next;
    }
    return(NULL);
}

/**
 * xmlLastElementChild:
 * @parent: the parent node
 *
 * Finds the last child node of that element which is a Element node
 * Note the handling of entities references is different than in
 * the W3C DOM element traversal spec since we don't have back reference
 * from entities content to entities references.
 *
 * Returns the last element child or NULL if not available
 */
xmlNodePtr
xmlLastElementChild(xmlNodePtr parent) {
    xmlNodePtr cur = NULL;

    if (parent == NULL)
        return(NULL);
    switch (parent->type) {
        case XML_ELEMENT_NODE:
        case XML_ENTITY_NODE:
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_HTML_DOCUMENT_NODE:
            cur = parent->last;
            break;
        default:
            return(NULL);
    }
    while (cur != NULL) {
        if (cur->type == XML_ELEMENT_NODE)
            return(cur);
        cur = cur->prev;
    }
    return(NULL);
}

/**
 * xmlPreviousElementSibling:
 * @node: the current node
 *
 * Finds the first closest previous sibling of the node which is an
 * element node.
 * Note the handling of entities references is different than in
 * the W3C DOM element traversal spec since we don't have back reference
 * from entities content to entities references.
 *
 * Returns the previous element sibling or NULL if not available
 */
xmlNodePtr
xmlPreviousElementSibling(xmlNodePtr node) {
    if (node == NULL)
        return(NULL);
    switch (node->type) {
        case XML_ELEMENT_NODE:
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
            node = node->prev;
            break;
        default:
            return(NULL);
    }
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE)
            return(node);
        node = node->prev;
    }
    return(NULL);
}

/**
 * xmlNextElementSibling:
 * @node: the current node
 *
 * Finds the first closest next sibling of the node which is an
 * element node.
 * Note the handling of entities references is different than in
 * the W3C DOM element traversal spec since we don't have back reference
 * from entities content to entities references.
 *
 * Returns the next element sibling or NULL if not available
 */
xmlNodePtr
xmlNextElementSibling(xmlNodePtr node) {
    if (node == NULL)
        return(NULL);
    switch (node->type) {
        case XML_ELEMENT_NODE:
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_DTD_NODE:
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
            node = node->next;
            break;
        default:
            return(NULL);
    }
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE)
            return(node);
        node = node->next;
    }
    return(NULL);
}

#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlFreeNodeList:
 * @cur:  the first node in the list
 *
 * Free a node and all its siblings, this is a recursive behaviour, all
 * the children are freed too.
 */
void
xmlFreeNodeList(xmlNodePtr cur) {
    xmlNodePtr next;
    xmlNodePtr parent;
    xmlDictPtr dict = NULL;
    size_t depth = 0;

    if (cur == NULL) return;
    if (cur->type == XML_NAMESPACE_DECL) {
  xmlFreeNsList((xmlNsPtr) cur);
  return;
    }
    if (cur->doc != NULL) dict = cur->doc->dict;
    while (1) {
        while ((cur->children != NULL) &&
               (cur->type != XML_DOCUMENT_NODE) &&
               (cur->type != XML_HTML_DOCUMENT_NODE) &&
               (cur->type != XML_DTD_NODE) &&
               (cur->type != XML_ENTITY_REF_NODE)) {
            cur = cur->children;
            depth += 1;
        }

        next = cur->next;
        parent = cur->parent;
  if ((cur->type == XML_DOCUMENT_NODE) ||
            (cur->type == XML_HTML_DOCUMENT_NODE)) {
            xmlFreeDoc((xmlDocPtr) cur);
        } else if (cur->type != XML_DTD_NODE) {

      if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
    xmlDeregisterNodeDefaultValue(cur);

      if (((cur->type == XML_ELEMENT_NODE) ||
     (cur->type == XML_XINCLUDE_START) ||
     (cur->type == XML_XINCLUDE_END)) &&
    (cur->properties != NULL))
    xmlFreePropList(cur->properties);
      if ((cur->type != XML_ELEMENT_NODE) &&
    (cur->type != XML_XINCLUDE_START) &&
    (cur->type != XML_XINCLUDE_END) &&
    (cur->type != XML_ENTITY_REF_NODE) &&
    (cur->content != (xmlChar *) &(cur->properties))) {
    DICT_FREE(cur->content)
      }
      if (((cur->type == XML_ELEMENT_NODE) ||
           (cur->type == XML_XINCLUDE_START) ||
     (cur->type == XML_XINCLUDE_END)) &&
    (cur->nsDef != NULL))
    xmlFreeNsList(cur->nsDef);

      /*
       * When a node is a text node or a comment, it uses a global static
       * variable for the name of the node.
       * Otherwise the node name might come from the document's
       * dictionary
       */
      if ((cur->name != NULL) &&
    (cur->type != XML_TEXT_NODE) &&
    (cur->type != XML_COMMENT_NODE))
    DICT_FREE(cur->name)
      xmlFree(cur);
  }

        if (next != NULL) {
      cur = next;
        } else {
            if ((depth == 0) || (parent == NULL))
                break;
            depth -= 1;
            cur = parent;
            cur->children = NULL;
        }
    }
}

/**
 * xmlFreeNode:
 * @cur:  the node
 *
 * Free a node, this is a recursive behaviour, all the children are freed too.
 * This doesn't unlink the child from the list, use xmlUnlinkNode() first.
 */
void
xmlFreeNode(xmlNodePtr cur) {
    xmlDictPtr dict = NULL;

    if (cur == NULL) return;

    /* use xmlFreeDtd for DTD nodes */
    if (cur->type == XML_DTD_NODE) {
  xmlFreeDtd((xmlDtdPtr) cur);
  return;
    }
    if (cur->type == XML_NAMESPACE_DECL) {
  xmlFreeNs((xmlNsPtr) cur);
        return;
    }
    if (cur->type == XML_ATTRIBUTE_NODE) {
  xmlFreeProp((xmlAttrPtr) cur);
  return;
    }

    if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
  xmlDeregisterNodeDefaultValue(cur);

    if (cur->doc != NULL) dict = cur->doc->dict;

    if (cur->type == XML_ENTITY_DECL) {
        xmlEntityPtr ent = (xmlEntityPtr) cur;
  DICT_FREE(ent->SystemID);
  DICT_FREE(ent->ExternalID);
    }
    if ((cur->children != NULL) &&
  (cur->type != XML_ENTITY_REF_NODE))
  xmlFreeNodeList(cur->children);

    if ((cur->type == XML_ELEMENT_NODE) ||
        (cur->type == XML_XINCLUDE_START) ||
        (cur->type == XML_XINCLUDE_END)) {
        if (cur->properties != NULL)
            xmlFreePropList(cur->properties);
        if (cur->nsDef != NULL)
            xmlFreeNsList(cur->nsDef);
    } else if ((cur->content != NULL) &&
               (cur->type != XML_ENTITY_REF_NODE) &&
               (cur->content != (xmlChar *) &(cur->properties))) {
        DICT_FREE(cur->content)
    }

    /*
     * When a node is a text node or a comment, it uses a global static
     * variable for the name of the node.
     * Otherwise the node name might come from the document's dictionary
     */
    if ((cur->name != NULL) &&
        (cur->type != XML_TEXT_NODE) &&
        (cur->type != XML_COMMENT_NODE))
  DICT_FREE(cur->name)

    xmlFree(cur);
}

/**
 * xmlUnlinkNode:
 * @cur:  the node
 *
 * Unlink a node from it's current context, the node is not freed
 * If one need to free the node, use xmlFreeNode() routine after the
 * unlink to discard it.
 * Note that namespace nodes can't be unlinked as they do not have
 * pointer to their parent.
 */
void
xmlUnlinkNode(xmlNodePtr cur) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlUnlinkNode : node == NULL\n");
#endif
  return;
    }
    if (cur->type == XML_NAMESPACE_DECL)
        return;
    if (cur->type == XML_DTD_NODE) {
  xmlDocPtr doc;
  doc = cur->doc;
  if (doc != NULL) {
      if (doc->intSubset == (xmlDtdPtr) cur)
    doc->intSubset = NULL;
      if (doc->extSubset == (xmlDtdPtr) cur)
    doc->extSubset = NULL;
  }
    }
    if (cur->type == XML_ENTITY_DECL) {
        xmlDocPtr doc;
  doc = cur->doc;
  if (doc != NULL) {
      if (doc->intSubset != NULL) {
          if (xmlHashLookup(doc->intSubset->entities, cur->name) == cur)
        xmlHashRemoveEntry(doc->intSubset->entities, cur->name,
                           NULL);
          if (xmlHashLookup(doc->intSubset->pentities, cur->name) == cur)
        xmlHashRemoveEntry(doc->intSubset->pentities, cur->name,
                           NULL);
      }
      if (doc->extSubset != NULL) {
          if (xmlHashLookup(doc->extSubset->entities, cur->name) == cur)
        xmlHashRemoveEntry(doc->extSubset->entities, cur->name,
                           NULL);
          if (xmlHashLookup(doc->extSubset->pentities, cur->name) == cur)
        xmlHashRemoveEntry(doc->extSubset->pentities, cur->name,
                           NULL);
      }
  }
    }
    if (cur->parent != NULL) {
  xmlNodePtr parent;
  parent = cur->parent;
  if (cur->type == XML_ATTRIBUTE_NODE) {
      if (parent->properties == (xmlAttrPtr) cur)
    parent->properties = ((xmlAttrPtr) cur)->next;
  } else {
      if (parent->children == cur)
    parent->children = cur->next;
      if (parent->last == cur)
    parent->last = cur->prev;
  }
  cur->parent = NULL;
    }
    if (cur->next != NULL)
        cur->next->prev = cur->prev;
    if (cur->prev != NULL)
        cur->prev->next = cur->next;
    cur->next = cur->prev = NULL;
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_WRITER_ENABLED)
/**
 * xmlReplaceNode:
 * @old:  the old node
 * @cur:  the node
 *
 * Unlink the old node from its current context, prune the new one
 * at the same place. If @cur was already inserted in a document it is
 * first unlinked from its existing context.
 *
 * See the note regarding namespaces in xmlAddChild.
 *
 * Returns the @old node
 */
xmlNodePtr
xmlReplaceNode(xmlNodePtr old, xmlNodePtr cur) {
    if (old == cur) return(NULL);
    if ((old == NULL) || (old->type == XML_NAMESPACE_DECL) ||
        (old->parent == NULL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlReplaceNode : old == NULL or without parent\n");
#endif
  return(NULL);
    }
    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) {
  xmlUnlinkNode(old);
  return(old);
    }
    if (cur == old) {
  return(old);
    }
    if ((old->type==XML_ATTRIBUTE_NODE) && (cur->type!=XML_ATTRIBUTE_NODE)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlReplaceNode : Trying to replace attribute node with other node type\n");
#endif
  return(old);
    }
    if ((cur->type==XML_ATTRIBUTE_NODE) && (old->type!=XML_ATTRIBUTE_NODE)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlReplaceNode : Trying to replace a non-attribute node with attribute node\n");
#endif
  return(old);
    }
    xmlUnlinkNode(cur);
    xmlSetTreeDoc(cur, old->doc);
    cur->parent = old->parent;
    cur->next = old->next;
    if (cur->next != NULL)
  cur->next->prev = cur;
    cur->prev = old->prev;
    if (cur->prev != NULL)
  cur->prev->next = cur;
    if (cur->parent != NULL) {
  if (cur->type == XML_ATTRIBUTE_NODE) {
      if (cur->parent->properties == (xmlAttrPtr)old)
    cur->parent->properties = ((xmlAttrPtr) cur);
  } else {
      if (cur->parent->children == old)
    cur->parent->children = cur;
      if (cur->parent->last == old)
    cur->parent->last = cur;
  }
    }
    old->next = old->prev = NULL;
    old->parent = NULL;
    return(old);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *                  *
 *    Copy operations           *
 *                  *
 ************************************************************************/

/**
 * xmlCopyNamespace:
 * @cur:  the namespace
 *
 * Do a copy of the namespace.
 *
 * Returns: a new #xmlNsPtr, or NULL in case of error.
 */
xmlNsPtr
xmlCopyNamespace(xmlNsPtr cur) {
    xmlNsPtr ret;

    if (cur == NULL) return(NULL);
    switch (cur->type) {
  case XML_LOCAL_NAMESPACE:
      ret = xmlNewNs(NULL, cur->href, cur->prefix);
      break;
  default:
#ifdef DEBUG_TREE
      xmlGenericError(xmlGenericErrorContext,
        "xmlCopyNamespace: invalid type %d\n", cur->type);
#endif
      return(NULL);
    }
    return(ret);
}

/**
 * xmlCopyNamespaceList:
 * @cur:  the first namespace
 *
 * Do a copy of an namespace list.
 *
 * Returns: a new #xmlNsPtr, or NULL in case of error.
 */
xmlNsPtr
xmlCopyNamespaceList(xmlNsPtr cur) {
    xmlNsPtr ret = NULL;
    xmlNsPtr p = NULL,q;

    while (cur != NULL) {
        q = xmlCopyNamespace(cur);
  if (p == NULL) {
      ret = p = q;
  } else {
      p->next = q;
      p = q;
  }
  cur = cur->next;
    }
    return(ret);
}

static xmlNodePtr
xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent);

static xmlAttrPtr
xmlCopyPropInternal(xmlDocPtr doc, xmlNodePtr target, xmlAttrPtr cur) {
    xmlAttrPtr ret;

    if (cur == NULL) return(NULL);
    if ((target != NULL) && (target->type != XML_ELEMENT_NODE))
        return(NULL);
    if (target != NULL)
  ret = xmlNewDocProp(target->doc, cur->name, NULL);
    else if (doc != NULL)
  ret = xmlNewDocProp(doc, cur->name, NULL);
    else if (cur->parent != NULL)
  ret = xmlNewDocProp(cur->parent->doc, cur->name, NULL);
    else if (cur->children != NULL)
  ret = xmlNewDocProp(cur->children->doc, cur->name, NULL);
    else
  ret = xmlNewDocProp(NULL, cur->name, NULL);
    if (ret == NULL) return(NULL);
    ret->parent = target;

    if ((cur->ns != NULL) && (target != NULL)) {
      xmlNsPtr ns;

      ns = xmlSearchNs(target->doc, target, cur->ns->prefix);
      if (ns == NULL) {
        /*
         * Humm, we are copying an element whose namespace is defined
         * out of the new tree scope. Search it in the original tree
         * and add it at the top of the new tree
         */
        ns = xmlSearchNs(cur->doc, cur->parent, cur->ns->prefix);
        if (ns != NULL) {
          xmlNodePtr root = target;
          xmlNodePtr pred = NULL;

          while (root->parent != NULL) {
            pred = root;
            root = root->parent;
          }
          if (root == (xmlNodePtr) target->doc) {
            /* correct possibly cycling above the document elt */
            root = pred;
          }
          ret->ns = xmlNewNs(root, ns->href, ns->prefix);
        }
      } else {
        /*
         * we have to find something appropriate here since
         * we can't be sure, that the namespace we found is identified
         * by the prefix
         */
        if (xmlStrEqual(ns->href, cur->ns->href)) {
          /* this is the nice case */
          ret->ns = ns;
        } else {
          /*
           * we are in trouble: we need a new reconciled namespace.
           * This is expensive
           */
          ret->ns = xmlNewReconciledNs(target->doc, target, cur->ns);
        }
      }

    } else
        ret->ns = NULL;

    if (cur->children != NULL) {
  xmlNodePtr tmp;

  ret->children = xmlStaticCopyNodeList(cur->children, ret->doc, (xmlNodePtr) ret);
  ret->last = NULL;
  tmp = ret->children;
  while (tmp != NULL) {
      /* tmp->parent = (xmlNodePtr)ret; */
      if (tmp->next == NULL)
          ret->last = tmp;
      tmp = tmp->next;
  }
    }
    /*
     * Try to handle IDs
     */
    if ((target!= NULL) && (cur!= NULL) &&
  (target->doc != NULL) && (cur->doc != NULL) &&
  (cur->doc->ids != NULL) && (cur->parent != NULL)) {
  if (xmlIsID(cur->doc, cur->parent, cur)) {
      xmlChar *id;

      id = xmlNodeListGetString(cur->doc, cur->children, 1);
      if (id != NULL) {
    xmlAddID(NULL, target->doc, id, ret);
    xmlFree(id);
      }
  }
    }
    return(ret);
}

/**
 * xmlCopyProp:
 * @target:  the element where the attribute will be grafted
 * @cur:  the attribute
 *
 * Do a copy of the attribute.
 *
 * Returns: a new #xmlAttrPtr, or NULL in case of error.
 */
xmlAttrPtr
xmlCopyProp(xmlNodePtr target, xmlAttrPtr cur) {
  return xmlCopyPropInternal(NULL, target, cur);
}

/**
 * xmlCopyPropList:
 * @target:  the element where the attributes will be grafted
 * @cur:  the first attribute
 *
 * Do a copy of an attribute list.
 *
 * Returns: a new #xmlAttrPtr, or NULL in case of error.
 */
xmlAttrPtr
xmlCopyPropList(xmlNodePtr target, xmlAttrPtr cur) {
    xmlAttrPtr ret = NULL;
    xmlAttrPtr p = NULL,q;

    if ((target != NULL) && (target->type != XML_ELEMENT_NODE))
        return(NULL);
    while (cur != NULL) {
        q = xmlCopyProp(target, cur);
  if (q == NULL)
      return(NULL);
  if (p == NULL) {
      ret = p = q;
  } else {
      p->next = q;
      q->prev = p;
      p = q;
  }
  cur = cur->next;
    }
    return(ret);
}

/*
 * NOTE about the CopyNode operations !
 *
 * They are split into external and internal parts for one
 * tricky reason: namespaces. Doing a direct copy of a node
 * say RPM:Copyright without changing the namespace pointer to
 * something else can produce stale links. One way to do it is
 * to keep a reference counter but this doesn't work as soon
 * as one moves the element or the subtree out of the scope of
 * the existing namespace. The actual solution seems to be to add
 * a copy of the namespace at the top of the copied tree if
 * not available in the subtree.
 * Hence two functions, the public front-end call the inner ones
 * The argument "recursive" normally indicates a recursive copy
 * of the node with values 0 (no) and 1 (yes).  For XInclude,
 * however, we allow a value of 2 to indicate copy properties and
 * namespace info, but don't recurse on children.
 */

static xmlNodePtr
xmlStaticCopyNode(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent,
                  int extended) {
    xmlNodePtr ret;

    if (node == NULL) return(NULL);
    switch (node->type) {
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ELEMENT_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
      break;
        case XML_ATTRIBUTE_NODE:
    return((xmlNodePtr) xmlCopyPropInternal(doc, parent, (xmlAttrPtr) node));
        case XML_NAMESPACE_DECL:
      return((xmlNodePtr) xmlCopyNamespaceList((xmlNsPtr) node));

        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
#ifdef LIBXML_TREE_ENABLED
      return((xmlNodePtr) xmlCopyDoc((xmlDocPtr) node, extended));
#endif /* LIBXML_TREE_ENABLED */
        case XML_DOCUMENT_TYPE_NODE:
        case XML_NOTATION_NODE:
        case XML_DTD_NODE:
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
            return(NULL);
    }

    /*
     * Allocate a new node and fill the fields.
     */
    ret = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (ret == NULL) {
  xmlTreeErrMemory("copying node");
  return(NULL);
    }
    memset(ret, 0, sizeof(xmlNode));
    ret->type = node->type;

    ret->doc = doc;
    ret->parent = parent;
    if (node->name == xmlStringText)
  ret->name = xmlStringText;
    else if (node->name == xmlStringTextNoenc)
  ret->name = xmlStringTextNoenc;
    else if (node->name == xmlStringComment)
  ret->name = xmlStringComment;
    else if (node->name != NULL) {
        if ((doc != NULL) && (doc->dict != NULL))
      ret->name = xmlDictLookup(doc->dict, node->name, -1);
  else
      ret->name = xmlStrdup(node->name);
    }
    if ((node->type != XML_ELEMENT_NODE) &&
  (node->content != NULL) &&
  (node->type != XML_ENTITY_REF_NODE) &&
  (node->type != XML_XINCLUDE_END) &&
  (node->type != XML_XINCLUDE_START)) {
  ret->content = xmlStrdup(node->content);
    }else{
      if (node->type == XML_ELEMENT_NODE)
        ret->line = node->line;
    }
    if (parent != NULL) {
  xmlNodePtr tmp;

  /*
   * this is a tricky part for the node register thing:
   * in case ret does get coalesced in xmlAddChild
   * the deregister-node callback is called; so we register ret now already
   */
  if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
      xmlRegisterNodeDefaultValue((xmlNodePtr)ret);

        /*
         * Note that since ret->parent is already set, xmlAddChild will
         * return early and not actually insert the node. It will only
         * coalesce text nodes and unnecessarily call xmlSetTreeDoc.
         * Assuming that the subtree to be copied always has its text
         * nodes coalesced, the somewhat confusing call to xmlAddChild
         * could be removed.
         */
        tmp = xmlAddChild(parent, ret);
  /* node could have coalesced */
  if (tmp != ret)
      return(tmp);
    }

    if (!extended)
  goto out;
    if (((node->type == XML_ELEMENT_NODE) ||
         (node->type == XML_XINCLUDE_START)) && (node->nsDef != NULL))
        ret->nsDef = xmlCopyNamespaceList(node->nsDef);

    if (node->ns != NULL) {
        xmlNsPtr ns;

  ns = xmlSearchNs(doc, ret, node->ns->prefix);
  if (ns == NULL) {
      /*
       * Humm, we are copying an element whose namespace is defined
       * out of the new tree scope. Search it in the original tree
       * and add it at the top of the new tree
       */
      ns = xmlSearchNs(node->doc, node, node->ns->prefix);
      if (ns != NULL) {
          xmlNodePtr root = ret;

    while (root->parent != NULL) root = root->parent;
    ret->ns = xmlNewNs(root, ns->href, ns->prefix);
    } else {
      ret->ns = xmlNewReconciledNs(doc, ret, node->ns);
      }
  } else {
      /*
       * reference the existing namespace definition in our own tree.
       */
      ret->ns = ns;
  }
    }
    if (((node->type == XML_ELEMENT_NODE) ||
         (node->type == XML_XINCLUDE_START)) && (node->properties != NULL))
        ret->properties = xmlCopyPropList(ret, node->properties);
    if (node->type == XML_ENTITY_REF_NODE) {
  if ((doc == NULL) || (node->doc != doc)) {
      /*
       * The copied node will go into a separate document, so
       * to avoid dangling references to the ENTITY_DECL node
       * we cannot keep the reference. Try to find it in the
       * target document.
       */
      ret->children = (xmlNodePtr) xmlGetDocEntity(doc, ret->name);
  } else {
            ret->children = node->children;
  }
  ret->last = ret->children;
    } else if ((node->children != NULL) && (extended != 2)) {
        xmlNodePtr cur, insert;

        cur = node->children;
        insert = ret;
        while (cur != NULL) {
            xmlNodePtr copy = xmlStaticCopyNode(cur, doc, insert, 2);
            if (copy == NULL) {
                xmlFreeNode(ret);
                return(NULL);
            }

            /* Check for coalesced text nodes */
            if (insert->last != copy) {
                if (insert->last == NULL) {
                    insert->children = copy;
                } else {
                    copy->prev = insert->last;
                    insert->last->next = copy;
                }
                insert->last = copy;
            }

            if ((cur->type != XML_ENTITY_REF_NODE) &&
                (cur->children != NULL)) {
                cur = cur->children;
                insert = copy;
                continue;
            }

            while (1) {
                if (cur->next != NULL) {
                    cur = cur->next;
                    break;
                }

                cur = cur->parent;
                insert = insert->parent;
                if (cur == node) {
                    cur = NULL;
                    break;
                }
            }
        }
    }

out:
    /* if parent != NULL we already registered the node above */
    if ((parent == NULL) &&
        ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue)))
  xmlRegisterNodeDefaultValue((xmlNodePtr)ret);
    return(ret);
}

static xmlNodePtr
xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
    xmlNodePtr ret = NULL;
    xmlNodePtr p = NULL,q;

    while (node != NULL) {
#ifdef LIBXML_TREE_ENABLED
  if (node->type == XML_DTD_NODE ) {
      if (doc == NULL) {
    node = node->next;
    continue;
      }
      if (doc->intSubset == NULL) {
    q = (xmlNodePtr) xmlCopyDtd( (xmlDtdPtr) node );
    if (q == NULL) return(NULL);
    q->doc = doc;
    q->parent = parent;
    doc->intSubset = (xmlDtdPtr) q;
    xmlAddChild(parent, q);
      } else {
    q = (xmlNodePtr) doc->intSubset;
    xmlAddChild(parent, q);
      }
  } else
#endif /* LIBXML_TREE_ENABLED */
      q = xmlStaticCopyNode(node, doc, parent, 1);
  if (q == NULL) return(NULL);
  if (ret == NULL) {
      q->prev = NULL;
      ret = p = q;
  } else if (p != q) {
  /* the test is required if xmlStaticCopyNode coalesced 2 text nodes */
      p->next = q;
      q->prev = p;
      p = q;
  }
  node = node->next;
    }
    return(ret);
}

/**
 * xmlCopyNode:
 * @node:  the node
 * @extended:   if 1 do a recursive copy (properties, namespaces and children
 *      when applicable)
 *    if 2 copy properties and namespaces (when applicable)
 *
 * Do a copy of the node.
 *
 * Returns: a new #xmlNodePtr, or NULL in case of error.
 */
xmlNodePtr
xmlCopyNode(xmlNodePtr node, int extended) {
    xmlNodePtr ret;

    ret = xmlStaticCopyNode(node, NULL, NULL, extended);
    return(ret);
}

/**
 * xmlDocCopyNode:
 * @node:  the node
 * @doc:  the document
 * @extended:   if 1 do a recursive copy (properties, namespaces and children
 *      when applicable)
 *    if 2 copy properties and namespaces (when applicable)
 *
 * Do a copy of the node to a given document.
 *
 * Returns: a new #xmlNodePtr, or NULL in case of error.
 */
xmlNodePtr
xmlDocCopyNode(xmlNodePtr node, xmlDocPtr doc, int extended) {
    xmlNodePtr ret;

    ret = xmlStaticCopyNode(node, doc, NULL, extended);
    return(ret);
}

/**
 * xmlDocCopyNodeList:
 * @doc: the target document
 * @node:  the first node in the list.
 *
 * Do a recursive copy of the node list.
 *
 * Returns: a new #xmlNodePtr, or NULL in case of error.
 */
xmlNodePtr xmlDocCopyNodeList(xmlDocPtr doc, xmlNodePtr node) {
    xmlNodePtr ret = xmlStaticCopyNodeList(node, doc, NULL);
    return(ret);
}

/**
 * xmlCopyNodeList:
 * @node:  the first node in the list.
 *
 * Do a recursive copy of the node list.
 * Use xmlDocCopyNodeList() if possible to ensure string interning.
 *
 * Returns: a new #xmlNodePtr, or NULL in case of error.
 */
xmlNodePtr xmlCopyNodeList(xmlNodePtr node) {
    xmlNodePtr ret = xmlStaticCopyNodeList(node, NULL, NULL);
    return(ret);
}

#if defined(LIBXML_TREE_ENABLED)
/**
 * xmlCopyDtd:
 * @dtd:  the dtd
 *
 * Do a copy of the dtd.
 *
 * Returns: a new #xmlDtdPtr, or NULL in case of error.
 */
xmlDtdPtr
xmlCopyDtd(xmlDtdPtr dtd) {
    xmlDtdPtr ret;
    xmlNodePtr cur, p = NULL, q;

    if (dtd == NULL) return(NULL);
    ret = xmlNewDtd(NULL, dtd->name, dtd->ExternalID, dtd->SystemID);
    if (ret == NULL) return(NULL);
    if (dtd->entities != NULL)
        ret->entities = (void *) xmlCopyEntitiesTable(
                      (xmlEntitiesTablePtr) dtd->entities);
    if (dtd->notations != NULL)
        ret->notations = (void *) xmlCopyNotationTable(
                      (xmlNotationTablePtr) dtd->notations);
    if (dtd->elements != NULL)
        ret->elements = (void *) xmlCopyElementTable(
                      (xmlElementTablePtr) dtd->elements);
    if (dtd->attributes != NULL)
        ret->attributes = (void *) xmlCopyAttributeTable(
                      (xmlAttributeTablePtr) dtd->attributes);
    if (dtd->pentities != NULL)
  ret->pentities = (void *) xmlCopyEntitiesTable(
          (xmlEntitiesTablePtr) dtd->pentities);

    cur = dtd->children;
    while (cur != NULL) {
  q = NULL;

  if (cur->type == XML_ENTITY_DECL) {
      xmlEntityPtr tmp = (xmlEntityPtr) cur;
      switch (tmp->etype) {
    case XML_INTERNAL_GENERAL_ENTITY:
    case XML_EXTERNAL_GENERAL_PARSED_ENTITY:
    case XML_EXTERNAL_GENERAL_UNPARSED_ENTITY:
        q = (xmlNodePtr) xmlGetEntityFromDtd(ret, tmp->name);
        break;
    case XML_INTERNAL_PARAMETER_ENTITY:
    case XML_EXTERNAL_PARAMETER_ENTITY:
        q = (xmlNodePtr)
      xmlGetParameterEntityFromDtd(ret, tmp->name);
        break;
    case XML_INTERNAL_PREDEFINED_ENTITY:
        break;
      }
  } else if (cur->type == XML_ELEMENT_DECL) {
      xmlElementPtr tmp = (xmlElementPtr) cur;
      q = (xmlNodePtr)
    xmlGetDtdQElementDesc(ret, tmp->name, tmp->prefix);
  } else if (cur->type == XML_ATTRIBUTE_DECL) {
      xmlAttributePtr tmp = (xmlAttributePtr) cur;
      q = (xmlNodePtr)
    xmlGetDtdQAttrDesc(ret, tmp->elem, tmp->name, tmp->prefix);
  } else if (cur->type == XML_COMMENT_NODE) {
      q = xmlCopyNode(cur, 0);
  }

  if (q == NULL) {
      cur = cur->next;
      continue;
  }

  if (p == NULL)
      ret->children = q;
  else
      p->next = q;

  q->prev = p;
  q->parent = (xmlNodePtr) ret;
  q->next = NULL;
  ret->last = q;
  p = q;
  cur = cur->next;
    }

    return(ret);
}
#endif

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlCopyDoc:
 * @doc:  the document
 * @recursive:  if not zero do a recursive copy.
 *
 * Do a copy of the document info. If recursive, the content tree will
 * be copied too as well as DTD, namespaces and entities.
 *
 * Returns: a new #xmlDocPtr, or NULL in case of error.
 */
xmlDocPtr
xmlCopyDoc(xmlDocPtr doc, int recursive) {
    xmlDocPtr ret;

    if (doc == NULL) return(NULL);
    ret = xmlNewDoc(doc->version);
    if (ret == NULL) return(NULL);
    ret->type = doc->type;
    if (doc->name != NULL)
        ret->name = xmlMemStrdup(doc->name);
    if (doc->encoding != NULL)
        ret->encoding = xmlStrdup(doc->encoding);
    if (doc->URL != NULL)
        ret->URL = xmlStrdup(doc->URL);
    ret->charset = doc->charset;
    ret->compression = doc->compression;
    ret->standalone = doc->standalone;
    if (!recursive) return(ret);

    ret->last = NULL;
    ret->children = NULL;
#ifdef LIBXML_TREE_ENABLED
    if (doc->intSubset != NULL) {
        ret->intSubset = xmlCopyDtd(doc->intSubset);
  if (ret->intSubset == NULL) {
      xmlFreeDoc(ret);
      return(NULL);
  }
  xmlSetTreeDoc((xmlNodePtr)ret->intSubset, ret);
  ret->intSubset->parent = ret;
    }
#endif
    if (doc->oldNs != NULL)
        ret->oldNs = xmlCopyNamespaceList(doc->oldNs);
    if (doc->children != NULL) {
  xmlNodePtr tmp;

  ret->children = xmlStaticCopyNodeList(doc->children, ret,
                                   (xmlNodePtr)ret);
  ret->last = NULL;
  tmp = ret->children;
  while (tmp != NULL) {
      if (tmp->next == NULL)
          ret->last = tmp;
      tmp = tmp->next;
  }
    }
    return(ret);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *                  *
 *    Content access functions        *
 *                  *
 ************************************************************************/

/**
 * xmlGetLineNoInternal:
 * @node: valid node
 * @depth: used to limit any risk of recursion
 *
 * Get line number of @node.
 * Try to override the limitation of lines being store in 16 bits ints
 *
 * Returns the line number if successful, -1 otherwise
 */
static long
xmlGetLineNoInternal(const xmlNode *node, int depth)
{
    long result = -1;

    if (depth >= 5)
        return(-1);

    if (!node)
        return result;
    if ((node->type == XML_ELEMENT_NODE) ||
        (node->type == XML_TEXT_NODE) ||
  (node->type == XML_COMMENT_NODE) ||
  (node->type == XML_PI_NODE)) {
  if (node->line == 65535) {
      if ((node->type == XML_TEXT_NODE) && (node->psvi != NULL))
          result = (long) (ptrdiff_t) node->psvi;
      else if ((node->type == XML_ELEMENT_NODE) &&
               (node->children != NULL))
          result = xmlGetLineNoInternal(node->children, depth + 1);
      else if (node->next != NULL)
          result = xmlGetLineNoInternal(node->next, depth + 1);
      else if (node->prev != NULL)
          result = xmlGetLineNoInternal(node->prev, depth + 1);
  }
  if ((result == -1) || (result == 65535))
      result = (long) node->line;
    } else if ((node->prev != NULL) &&
             ((node->prev->type == XML_ELEMENT_NODE) ||
        (node->prev->type == XML_TEXT_NODE) ||
        (node->prev->type == XML_COMMENT_NODE) ||
        (node->prev->type == XML_PI_NODE)))
        result = xmlGetLineNoInternal(node->prev, depth + 1);
    else if ((node->parent != NULL) &&
             (node->parent->type == XML_ELEMENT_NODE))
        result = xmlGetLineNoInternal(node->parent, depth + 1);

    return result;
}

/**
 * xmlGetLineNo:
 * @node: valid node
 *
 * Get line number of @node.
 * Try to override the limitation of lines being store in 16 bits ints
 * if XML_PARSE_BIG_LINES parser option was used
 *
 * Returns the line number if successful, -1 otherwise
 */
long
xmlGetLineNo(const xmlNode *node)
{
    return(xmlGetLineNoInternal(node, 0));
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_DEBUG_ENABLED)
/**
 * xmlGetNodePath:
 * @node: a node
 *
 * Build a structure based Path for the given node
 *
 * Returns the new path or NULL in case of error. The caller must free
 *     the returned string
 */
xmlChar *
xmlGetNodePath(const xmlNode *node)
{
    const xmlNode *cur, *tmp, *next;
    xmlChar *buffer = NULL, *temp;
    size_t buf_len;
    xmlChar *buf;
    const char *sep;
    const char *name;
    char nametemp[100];
    int occur = 0, generic;

    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL))
        return (NULL);

    buf_len = 500;
    buffer = (xmlChar *) xmlMallocAtomic(buf_len);
    if (buffer == NULL) {
  xmlTreeErrMemory("getting node path");
        return (NULL);
    }
    buf = (xmlChar *) xmlMallocAtomic(buf_len);
    if (buf == NULL) {
  xmlTreeErrMemory("getting node path");
        xmlFree(buffer);
        return (NULL);
    }

    buffer[0] = 0;
    cur = node;
    do {
        name = "";
        sep = "?";
        occur = 0;
        if ((cur->type == XML_DOCUMENT_NODE) ||
            (cur->type == XML_HTML_DOCUMENT_NODE)) {
            if (buffer[0] == '/')
                break;
            sep = "/";
            next = NULL;
        } else if (cur->type == XML_ELEMENT_NODE) {
      generic = 0;
            sep = "/";
            name = (const char *) cur->name;
            if (cur->ns) {
    if (cur->ns->prefix != NULL) {
                    snprintf(nametemp, sizeof(nametemp) - 1, "%s:%s",
      (char *)cur->ns->prefix, (char *)cur->name);
        nametemp[sizeof(nametemp) - 1] = 0;
        name = nametemp;
    } else {
        /*
        * We cannot express named elements in the default
        * namespace, so use "*".
        */
        generic = 1;
        name = "*";
    }
            }
            next = cur->parent;

            /*
             * Thumbler index computation
       * TODO: the occurrence test seems bogus for namespaced names
             */
            tmp = cur->prev;
            while (tmp != NULL) {
                if ((tmp->type == XML_ELEMENT_NODE) &&
        (generic ||
         (xmlStrEqual(cur->name, tmp->name) &&
         ((tmp->ns == cur->ns) ||
          ((tmp->ns != NULL) && (cur->ns != NULL) &&
           (xmlStrEqual(cur->ns->prefix, tmp->ns->prefix)))))))
                    occur++;
                tmp = tmp->prev;
            }
            if (occur == 0) {
                tmp = cur->next;
                while (tmp != NULL && occur == 0) {
                    if ((tmp->type == XML_ELEMENT_NODE) &&
      (generic ||
       (xmlStrEqual(cur->name, tmp->name) &&
       ((tmp->ns == cur->ns) ||
        ((tmp->ns != NULL) && (cur->ns != NULL) &&
         (xmlStrEqual(cur->ns->prefix, tmp->ns->prefix)))))))
                        occur++;
                    tmp = tmp->next;
                }
                if (occur != 0)
                    occur = 1;
            } else
                occur++;
        } else if (cur->type == XML_COMMENT_NODE) {
            sep = "/";
      name = "comment()";
            next = cur->parent;

            /*
             * Thumbler index computation
             */
            tmp = cur->prev;
            while (tmp != NULL) {
                if (tmp->type == XML_COMMENT_NODE)
        occur++;
                tmp = tmp->prev;
            }
            if (occur == 0) {
                tmp = cur->next;
                while (tmp != NULL && occur == 0) {
        if (tmp->type == XML_COMMENT_NODE)
            occur++;
                    tmp = tmp->next;
                }
                if (occur != 0)
                    occur = 1;
            } else
                occur++;
        } else if ((cur->type == XML_TEXT_NODE) ||
                   (cur->type == XML_CDATA_SECTION_NODE)) {
            sep = "/";
      name = "text()";
            next = cur->parent;

            /*
             * Thumbler index computation
             */
            tmp = cur->prev;
            while (tmp != NULL) {
                if ((tmp->type == XML_TEXT_NODE) ||
        (tmp->type == XML_CDATA_SECTION_NODE))
        occur++;
                tmp = tmp->prev;
            }
      /*
      * Evaluate if this is the only text- or CDATA-section-node;
      * if yes, then we'll get "text()", otherwise "text()[1]".
      */
            if (occur == 0) {
                tmp = cur->next;
                while (tmp != NULL) {
        if ((tmp->type == XML_TEXT_NODE) ||
      (tmp->type == XML_CDATA_SECTION_NODE))
        {
      occur = 1;
      break;
        }
        tmp = tmp->next;
    }
            } else
                occur++;
        } else if (cur->type == XML_PI_NODE) {
            sep = "/";
      snprintf(nametemp, sizeof(nametemp) - 1,
         "processing-instruction('%s')", (char *)cur->name);
            nametemp[sizeof(nametemp) - 1] = 0;
            name = nametemp;

      next = cur->parent;

            /*
             * Thumbler index computation
             */
            tmp = cur->prev;
            while (tmp != NULL) {
                if ((tmp->type == XML_PI_NODE) &&
        (xmlStrEqual(cur->name, tmp->name)))
                    occur++;
                tmp = tmp->prev;
            }
            if (occur == 0) {
                tmp = cur->next;
                while (tmp != NULL && occur == 0) {
                    if ((tmp->type == XML_PI_NODE) &&
      (xmlStrEqual(cur->name, tmp->name)))
                        occur++;
                    tmp = tmp->next;
                }
                if (occur != 0)
                    occur = 1;
            } else
                occur++;

        } else if (cur->type == XML_ATTRIBUTE_NODE) {
            sep = "/@";
            name = (const char *) (((xmlAttrPtr) cur)->name);
            if (cur->ns) {
          if (cur->ns->prefix != NULL)
                    snprintf(nametemp, sizeof(nametemp) - 1, "%s:%s",
      (char *)cur->ns->prefix, (char *)cur->name);
    else
        snprintf(nametemp, sizeof(nametemp) - 1, "%s",
      (char *)cur->name);
                nametemp[sizeof(nametemp) - 1] = 0;
                name = nametemp;
            }
            next = ((xmlAttrPtr) cur)->parent;
        } else {
            xmlFree(buf);
            xmlFree(buffer);
            return (NULL);
        }

        /*
         * Make sure there is enough room
         */
        if (xmlStrlen(buffer) + sizeof(nametemp) + 20 > buf_len) {
            buf_len =
                2 * buf_len + xmlStrlen(buffer) + sizeof(nametemp) + 20;
            temp = (xmlChar *) xmlRealloc(buffer, buf_len);
            if (temp == NULL) {
    xmlTreeErrMemory("getting node path");
                xmlFree(buf);
                xmlFree(buffer);
                return (NULL);
            }
            buffer = temp;
            temp = (xmlChar *) xmlRealloc(buf, buf_len);
            if (temp == NULL) {
    xmlTreeErrMemory("getting node path");
                xmlFree(buf);
                xmlFree(buffer);
                return (NULL);
            }
            buf = temp;
        }
        if (occur == 0)
            snprintf((char *) buf, buf_len, "%s%s%s",
                     sep, name, (char *) buffer);
        else
            snprintf((char *) buf, buf_len, "%s%s[%d]%s",
                     sep, name, occur, (char *) buffer);
        snprintf((char *) buffer, buf_len, "%s", (char *)buf);
        cur = next;
    } while (cur != NULL);
    xmlFree(buf);
    return (buffer);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlDocGetRootElement:
 * @doc:  the document
 *
 * Get the root element of the document (doc->children is a list
 * containing possibly comments, PIs, etc ...).
 *
 * Returns the #xmlNodePtr for the root or NULL
 */
xmlNodePtr
xmlDocGetRootElement(const xmlDoc *doc) {
    xmlNodePtr ret;

    if (doc == NULL) return(NULL);
    ret = doc->children;
    while (ret != NULL) {
  if (ret->type == XML_ELEMENT_NODE)
      return(ret);
        ret = ret->next;
    }
    return(ret);
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_WRITER_ENABLED)
/**
 * xmlDocSetRootElement:
 * @doc:  the document
 * @root:  the new document root element, if root is NULL no action is taken,
 *         to remove a node from a document use xmlUnlinkNode(root) instead.
 *
 * Set the root element of the document (doc->children is a list
 * containing possibly comments, PIs, etc ...).
 *
 * Returns the old root element if any was found, NULL if root was NULL
 */
xmlNodePtr
xmlDocSetRootElement(xmlDocPtr doc, xmlNodePtr root) {
    xmlNodePtr old = NULL;

    if (doc == NULL) return(NULL);
    if ((root == NULL) || (root->type == XML_NAMESPACE_DECL))
  return(NULL);
    xmlUnlinkNode(root);
    xmlSetTreeDoc(root, doc);
    root->parent = (xmlNodePtr) doc;
    old = doc->children;
    while (old != NULL) {
  if (old->type == XML_ELEMENT_NODE)
      break;
        old = old->next;
    }
    if (old == NULL) {
  if (doc->children == NULL) {
      doc->children = root;
      doc->last = root;
  } else {
      xmlAddSibling(doc->children, root);
  }
    } else {
  xmlReplaceNode(old, root);
    }
    return(old);
}
#endif

#if defined(LIBXML_TREE_ENABLED)
/**
 * xmlNodeSetLang:
 * @cur:  the node being changed
 * @lang:  the language description
 *
 * Set the language of a node, i.e. the values of the xml:lang
 * attribute.
 */
void
xmlNodeSetLang(xmlNodePtr cur, const xmlChar *lang) {
    xmlNsPtr ns;

    if (cur == NULL) return;
    switch(cur->type) {
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_COMMENT_NODE:
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_NOTATION_NODE:
        case XML_HTML_DOCUMENT_NODE:
        case XML_DTD_NODE:
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
        case XML_PI_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      return;
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
      break;
    }
    ns = xmlSearchNsByHref(cur->doc, cur, XML_XML_NAMESPACE);
    if (ns == NULL)
  return;
    xmlSetNsProp(cur, ns, BAD_CAST "lang", lang);
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNodeGetLang:
 * @cur:  the node being checked
 *
 * Searches the language of a node, i.e. the values of the xml:lang
 * attribute or the one carried by the nearest ancestor.
 *
 * Returns a pointer to the lang value, or NULL if not found
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlNodeGetLang(const xmlNode *cur) {
    xmlChar *lang;

    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
        return(NULL);
    while (cur != NULL) {
        lang = xmlGetNsProp(cur, BAD_CAST "lang", XML_XML_NAMESPACE);
  if (lang != NULL)
      return(lang);
  cur = cur->parent;
    }
    return(NULL);
}


#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNodeSetSpacePreserve:
 * @cur:  the node being changed
 * @val:  the xml:space value ("0": default, 1: "preserve")
 *
 * Set (or reset) the space preserving behaviour of a node, i.e. the
 * value of the xml:space attribute.
 */
void
xmlNodeSetSpacePreserve(xmlNodePtr cur, int val) {
    xmlNsPtr ns;

    if (cur == NULL) return;
    switch(cur->type) {
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_COMMENT_NODE:
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_NOTATION_NODE:
        case XML_HTML_DOCUMENT_NODE:
        case XML_DTD_NODE:
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
        case XML_PI_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      return;
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
      break;
    }
    ns = xmlSearchNsByHref(cur->doc, cur, XML_XML_NAMESPACE);
    if (ns == NULL)
  return;
    switch (val) {
    case 0:
  xmlSetNsProp(cur, ns, BAD_CAST "space", BAD_CAST "default");
  break;
    case 1:
  xmlSetNsProp(cur, ns, BAD_CAST "space", BAD_CAST "preserve");
  break;
    }
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNodeGetSpacePreserve:
 * @cur:  the node being checked
 *
 * Searches the space preserving behaviour of a node, i.e. the values
 * of the xml:space attribute or the one carried by the nearest
 * ancestor.
 *
 * Returns -1 if xml:space is not inherited, 0 if "default", 1 if "preserve"
 */
int
xmlNodeGetSpacePreserve(const xmlNode *cur) {
    xmlChar *space;

    if ((cur == NULL) || (cur->type != XML_ELEMENT_NODE))
        return(-1);
    while (cur != NULL) {
  space = xmlGetNsProp(cur, BAD_CAST "space", XML_XML_NAMESPACE);
  if (space != NULL) {
      if (xmlStrEqual(space, BAD_CAST "preserve")) {
    xmlFree(space);
    return(1);
      }
      if (xmlStrEqual(space, BAD_CAST "default")) {
    xmlFree(space);
    return(0);
      }
      xmlFree(space);
  }
  cur = cur->parent;
    }
    return(-1);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNodeSetName:
 * @cur:  the node being changed
 * @name:  the new tag name
 *
 * Set (or reset) the name of a node.
 */
void
xmlNodeSetName(xmlNodePtr cur, const xmlChar *name) {
    xmlDocPtr doc;
    xmlDictPtr dict;
    const xmlChar *freeme = NULL;

    if (cur == NULL) return;
    if (name == NULL) return;
    switch(cur->type) {
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_COMMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_NOTATION_NODE:
        case XML_HTML_DOCUMENT_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      return;
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
        case XML_PI_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_DTD_NODE:
        case XML_DOCUMENT_NODE:
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
      break;
    }
    doc = cur->doc;
    if (doc != NULL)
  dict = doc->dict;
    else
        dict = NULL;
    if (dict != NULL) {
        if ((cur->name != NULL) && (!xmlDictOwns(dict, cur->name)))
      freeme = cur->name;
  cur->name = xmlDictLookup(dict, name, -1);
    } else {
  if (cur->name != NULL)
      freeme = cur->name;
  cur->name = xmlStrdup(name);
    }

    if (freeme)
        xmlFree((xmlChar *) freeme);
}
#endif

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_XINCLUDE_ENABLED)
/**
 * xmlNodeSetBase:
 * @cur:  the node being changed
 * @uri:  the new base URI
 *
 * Set (or reset) the base URI of a node, i.e. the value of the
 * xml:base attribute.
 */
void
xmlNodeSetBase(xmlNodePtr cur, const xmlChar* uri) {
    xmlNsPtr ns;
    xmlChar* fixed;

    if (cur == NULL) return;
    switch(cur->type) {
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_COMMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_DOCUMENT_FRAG_NODE:
        case XML_NOTATION_NODE:
        case XML_DTD_NODE:
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
        case XML_PI_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      return;
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
      break;
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE: {
      xmlDocPtr doc = (xmlDocPtr) cur;

      if (doc->URL != NULL)
    xmlFree((xmlChar *) doc->URL);
      if (uri == NULL)
    doc->URL = NULL;
      else
    doc->URL = xmlPathToURI(uri);
      return;
  }
    }

    ns = xmlSearchNsByHref(cur->doc, cur, XML_XML_NAMESPACE);
    if (ns == NULL)
  return;
    fixed = xmlPathToURI(uri);
    if (fixed != NULL) {
  xmlSetNsProp(cur, ns, BAD_CAST "base", fixed);
  xmlFree(fixed);
    } else {
  xmlSetNsProp(cur, ns, BAD_CAST "base", uri);
    }
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNodeGetBase:
 * @doc:  the document the node pertains to
 * @cur:  the node being checked
 *
 * Searches for the BASE URL. The code should work on both XML
 * and HTML document even if base mechanisms are completely different.
 * It returns the base as defined in RFC 2396 sections
 * 5.1.1. Base URI within Document Content
 * and
 * 5.1.2. Base URI from the Encapsulating Entity
 * However it does not return the document base (5.1.3), use
 * doc->URL in this case
 *
 * Returns a pointer to the base URL, or NULL if not found
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlNodeGetBase(const xmlDoc *doc, const xmlNode *cur) {
    xmlChar *oldbase = NULL;
    xmlChar *base, *newbase;

    if ((cur == NULL) && (doc == NULL))
        return(NULL);
    if ((cur != NULL) && (cur->type == XML_NAMESPACE_DECL))
        return(NULL);
    if (doc == NULL) doc = cur->doc;
    if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
        cur = doc->children;
  while ((cur != NULL) && (cur->name != NULL)) {
      if (cur->type != XML_ELEMENT_NODE) {
          cur = cur->next;
    continue;
      }
      if (!xmlStrcasecmp(cur->name, BAD_CAST "html")) {
          cur = cur->children;
    continue;
      }
      if (!xmlStrcasecmp(cur->name, BAD_CAST "head")) {
          cur = cur->children;
    continue;
      }
      if (!xmlStrcasecmp(cur->name, BAD_CAST "base")) {
                return(xmlGetProp(cur, BAD_CAST "href"));
      }
      cur = cur->next;
  }
  return(NULL);
    }
    while (cur != NULL) {
  if (cur->type == XML_ENTITY_DECL) {
      xmlEntityPtr ent = (xmlEntityPtr) cur;
      return(xmlStrdup(ent->URI));
  }
  if (cur->type == XML_ELEMENT_NODE) {
      base = xmlGetNsProp(cur, BAD_CAST "base", XML_XML_NAMESPACE);
      if (base != NULL) {
    if (oldbase != NULL) {
        newbase = xmlBuildURI(oldbase, base);
        if (newbase != NULL) {
      xmlFree(oldbase);
      xmlFree(base);
      oldbase = newbase;
        } else {
      xmlFree(oldbase);
      xmlFree(base);
      return(NULL);
        }
    } else {
        oldbase = base;
    }
    if ((!xmlStrncmp(oldbase, BAD_CAST "http://", 7)) ||
        (!xmlStrncmp(oldbase, BAD_CAST "ftp://", 6)) ||
        (!xmlStrncmp(oldbase, BAD_CAST "urn:", 4)))
        return(oldbase);
      }
  }
  cur = cur->parent;
    }
    if ((doc != NULL) && (doc->URL != NULL)) {
  if (oldbase == NULL)
      return(xmlStrdup(doc->URL));
  newbase = xmlBuildURI(oldbase, doc->URL);
  xmlFree(oldbase);
  return(newbase);
    }
    return(oldbase);
}

/**
 * xmlNodeBufGetContent:
 * @buffer:  a buffer
 * @cur:  the node being read
 *
 * Read the value of a node @cur, this can be either the text carried
 * directly by this node if it's a TEXT node or the aggregate string
 * of the values carried by this node child's (TEXT and ENTITY_REF).
 * Entity references are substituted.
 * Fills up the buffer @buffer with this value
 *
 * Returns 0 in case of success and -1 in case of error.
 */
int
xmlNodeBufGetContent(xmlBufferPtr buffer, const xmlNode *cur)
{
    xmlBufPtr buf;
    int ret;

    if ((cur == NULL) || (buffer == NULL)) return(-1);
    buf = xmlBufFromBuffer(buffer);
    ret = xmlBufGetNodeContent(buf, cur);
    buffer = xmlBufBackToBuffer(buf);
    if ((ret < 0) || (buffer == NULL))
        return(-1);
    return(0);
}

/**
 * xmlBufGetNodeContent:
 * @buf:  a buffer xmlBufPtr
 * @cur:  the node being read
 *
 * Read the value of a node @cur, this can be either the text carried
 * directly by this node if it's a TEXT node or the aggregate string
 * of the values carried by this node child's (TEXT and ENTITY_REF).
 * Entity references are substituted.
 * Fills up the buffer @buf with this value
 *
 * Returns 0 in case of success and -1 in case of error.
 */
int
xmlBufGetNodeContent(xmlBufPtr buf, const xmlNode *cur)
{
    if ((cur == NULL) || (buf == NULL)) return(-1);
    switch (cur->type) {
        case XML_CDATA_SECTION_NODE:
        case XML_TEXT_NODE:
      xmlBufCat(buf, cur->content);
            break;
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ELEMENT_NODE:{
                const xmlNode *tmp = cur;

                while (tmp != NULL) {
                    switch (tmp->type) {
                        case XML_CDATA_SECTION_NODE:
                        case XML_TEXT_NODE:
                            if (tmp->content != NULL)
                                xmlBufCat(buf, tmp->content);
                            break;
                        case XML_ENTITY_REF_NODE:
                            xmlBufGetNodeContent(buf, tmp);
                            break;
                        default:
                            break;
                    }
                    /*
                     * Skip to next node
                     */
                    if (tmp->children != NULL) {
                        if (tmp->children->type != XML_ENTITY_DECL) {
                            tmp = tmp->children;
                            continue;
                        }
                    }
                    if (tmp == cur)
                        break;

                    if (tmp->next != NULL) {
                        tmp = tmp->next;
                        continue;
                    }

                    do {
                        tmp = tmp->parent;
                        if (tmp == NULL)
                            break;
                        if (tmp == cur) {
                            tmp = NULL;
                            break;
                        }
                        if (tmp->next != NULL) {
                            tmp = tmp->next;
                            break;
                        }
                    } while (tmp != NULL);
                }
    break;
            }
        case XML_ATTRIBUTE_NODE:{
                xmlAttrPtr attr = (xmlAttrPtr) cur;
    xmlNodePtr tmp = attr->children;

    while (tmp != NULL) {
        if (tmp->type == XML_TEXT_NODE)
            xmlBufCat(buf, tmp->content);
        else
            xmlBufGetNodeContent(buf, tmp);
        tmp = tmp->next;
    }
                break;
            }
        case XML_COMMENT_NODE:
        case XML_PI_NODE:
      xmlBufCat(buf, cur->content);
            break;
        case XML_ENTITY_REF_NODE:{
                xmlEntityPtr ent;
                xmlNodePtr tmp;

                /* lookup entity declaration */
                ent = xmlGetDocEntity(cur->doc, cur->name);
                if (ent == NULL)
                    return(-1);

                /* an entity content can be any "well balanced chunk",
                 * i.e. the result of the content [43] production:
                 * http://www.w3.org/TR/REC-xml#NT-content
                 * -> we iterate through child nodes and recursive call
                 * xmlNodeGetContent() which handles all possible node types */
                tmp = ent->children;
                while (tmp) {
        xmlBufGetNodeContent(buf, tmp);
                    tmp = tmp->next;
                }
    break;
            }
        case XML_ENTITY_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_NOTATION_NODE:
        case XML_DTD_NODE:
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
            break;
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
      cur = cur->children;
      while (cur!= NULL) {
    if ((cur->type == XML_ELEMENT_NODE) ||
        (cur->type == XML_TEXT_NODE) ||
        (cur->type == XML_CDATA_SECTION_NODE)) {
        xmlBufGetNodeContent(buf, cur);
    }
    cur = cur->next;
      }
      break;
        case XML_NAMESPACE_DECL:
      xmlBufCat(buf, ((xmlNsPtr) cur)->href);
      break;
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
            break;
    }
    return(0);
}

/**
 * xmlNodeGetContent:
 * @cur:  the node being read
 *
 * Read the value of a node, this can be either the text carried
 * directly by this node if it's a TEXT node or the aggregate string
 * of the values carried by this node child's (TEXT and ENTITY_REF).
 * Entity references are substituted.
 * Returns a new #xmlChar * or NULL if no content is available.
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlNodeGetContent(const xmlNode *cur)
{
    if (cur == NULL)
        return (NULL);
    switch (cur->type) {
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ELEMENT_NODE:{
                xmlBufPtr buf;
                xmlChar *ret;

                buf = xmlBufCreateSize(64);
                if (buf == NULL)
                    return (NULL);
                xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);
    xmlBufGetNodeContent(buf, cur);
                ret = xmlBufDetach(buf);
                xmlBufFree(buf);
                return (ret);
            }
        case XML_ATTRIBUTE_NODE:
      return(xmlGetPropNodeValueInternal((xmlAttrPtr) cur));
        case XML_COMMENT_NODE:
        case XML_PI_NODE:
            if (cur->content != NULL)
                return (xmlStrdup(cur->content));
            return (NULL);
        case XML_ENTITY_REF_NODE:{
                xmlEntityPtr ent;
                xmlBufPtr buf;
                xmlChar *ret;

                /* lookup entity declaration */
                ent = xmlGetDocEntity(cur->doc, cur->name);
                if (ent == NULL)
                    return (NULL);

                buf = xmlBufCreate();
                if (buf == NULL)
                    return (NULL);
                xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);

                xmlBufGetNodeContent(buf, cur);

                ret = xmlBufDetach(buf);
                xmlBufFree(buf);
                return (ret);
            }
        case XML_ENTITY_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_NOTATION_NODE:
        case XML_DTD_NODE:
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
            return (NULL);
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE: {
      xmlBufPtr buf;
      xmlChar *ret;

      buf = xmlBufCreate();
      if (buf == NULL)
    return (NULL);
            xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);

      xmlBufGetNodeContent(buf, (xmlNodePtr) cur);

      ret = xmlBufDetach(buf);
      xmlBufFree(buf);
      return (ret);
  }
        case XML_NAMESPACE_DECL: {
      xmlChar *tmp;

      tmp = xmlStrdup(((xmlNsPtr) cur)->href);
            return (tmp);
  }
        case XML_ELEMENT_DECL:
            /* TODO !!! */
            return (NULL);
        case XML_ATTRIBUTE_DECL:
            /* TODO !!! */
            return (NULL);
        case XML_ENTITY_DECL:
            /* TODO !!! */
            return (NULL);
        case XML_CDATA_SECTION_NODE:
        case XML_TEXT_NODE:
            if (cur->content != NULL)
                return (xmlStrdup(cur->content));
            return (NULL);
    }
    return (NULL);
}

/**
 * xmlNodeSetContent:
 * @cur:  the node being modified
 * @content:  the new value of the content
 *
 * Replace the content of a node.
 * NOTE: @content is supposed to be a piece of XML CDATA, so it allows entity
 *       references, but XML special chars need to be escaped first by using
 *       xmlEncodeEntitiesReentrant() resp. xmlEncodeSpecialChars().
 */
void
xmlNodeSetContent(xmlNodePtr cur, const xmlChar *content) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNodeSetContent : node == NULL\n");
#endif
  return;
    }
    switch (cur->type) {
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
      if (cur->children != NULL) xmlFreeNodeList(cur->children);
      cur->children = xmlStringGetNodeList(cur->doc, content);
      UPDATE_LAST_CHILD_AND_PARENT(cur)
      break;
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
      if ((cur->content != NULL) &&
          (cur->content != (xmlChar *) &(cur->properties))) {
          if (!((cur->doc != NULL) && (cur->doc->dict != NULL) &&
        (xmlDictOwns(cur->doc->dict, cur->content))))
        xmlFree(cur->content);
      }
      if (cur->children != NULL) xmlFreeNodeList(cur->children);
      cur->last = cur->children = NULL;
      if (content != NULL) {
    cur->content = xmlStrdup(content);
      } else
    cur->content = NULL;
      cur->properties = NULL;
      break;
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      break;
        case XML_NOTATION_NODE:
      break;
        case XML_DTD_NODE:
      break;
  case XML_NAMESPACE_DECL:
      break;
        case XML_ELEMENT_DECL:
      /* TODO !!! */
      break;
        case XML_ATTRIBUTE_DECL:
      /* TODO !!! */
      break;
        case XML_ENTITY_DECL:
      /* TODO !!! */
      break;
    }
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlNodeSetContentLen:
 * @cur:  the node being modified
 * @content:  the new value of the content
 * @len:  the size of @content
 *
 * Replace the content of a node.
 * NOTE: @content is supposed to be a piece of XML CDATA, so it allows entity
 *       references, but XML special chars need to be escaped first by using
 *       xmlEncodeEntitiesReentrant() resp. xmlEncodeSpecialChars().
 */
void
xmlNodeSetContentLen(xmlNodePtr cur, const xmlChar *content, int len) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNodeSetContentLen : node == NULL\n");
#endif
  return;
    }
    switch (cur->type) {
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
      if (cur->children != NULL) xmlFreeNodeList(cur->children);
      cur->children = xmlStringLenGetNodeList(cur->doc, content, len);
      UPDATE_LAST_CHILD_AND_PARENT(cur)
      break;
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_NOTATION_NODE:
      if ((cur->content != NULL) &&
          (cur->content != (xmlChar *) &(cur->properties))) {
          if (!((cur->doc != NULL) && (cur->doc->dict != NULL) &&
        (xmlDictOwns(cur->doc->dict, cur->content))))
        xmlFree(cur->content);
      }
      if (cur->children != NULL) xmlFreeNodeList(cur->children);
      cur->children = cur->last = NULL;
      if (content != NULL) {
    cur->content = xmlStrndup(content, len);
      } else
    cur->content = NULL;
      cur->properties = NULL;
      break;
        case XML_DOCUMENT_NODE:
        case XML_DTD_NODE:
        case XML_HTML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      break;
        case XML_ELEMENT_DECL:
      /* TODO !!! */
      break;
        case XML_ATTRIBUTE_DECL:
      /* TODO !!! */
      break;
        case XML_ENTITY_DECL:
      /* TODO !!! */
      break;
    }
}
#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNodeAddContentLen:
 * @cur:  the node being modified
 * @content:  extra content
 * @len:  the size of @content
 *
 * Append the extra substring to the node content.
 * NOTE: In contrast to xmlNodeSetContentLen(), @content is supposed to be
 *       raw text, so unescaped XML special chars are allowed, entity
 *       references are not supported.
 */
void
xmlNodeAddContentLen(xmlNodePtr cur, const xmlChar *content, int len) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNodeAddContentLen : node == NULL\n");
#endif
  return;
    }
    if (len <= 0) return;
    switch (cur->type) {
        case XML_DOCUMENT_FRAG_NODE:
        case XML_ELEMENT_NODE: {
      xmlNodePtr last, newNode, tmp;

      last = cur->last;
      newNode = xmlNewDocTextLen(cur->doc, content, len);
      if (newNode != NULL) {
    tmp = xmlAddChild(cur, newNode);
    if (tmp != newNode)
        return;
          if ((last != NULL) && (last->next == newNode)) {
        xmlTextMerge(last, newNode);
    }
      }
      break;
  }
        case XML_ATTRIBUTE_NODE:
      break;
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_ENTITY_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_NOTATION_NODE:
      if (content != NULL) {
          if ((cur->content == (xmlChar *) &(cur->properties)) ||
        ((cur->doc != NULL) && (cur->doc->dict != NULL) &&
          xmlDictOwns(cur->doc->dict, cur->content))) {
        cur->content = xmlStrncatNew(cur->content, content, len);
        cur->properties = NULL;
    } else {
        cur->content = xmlStrncat(cur->content, content, len);
                }
            }
      break;
        case XML_DOCUMENT_NODE:
        case XML_DTD_NODE:
        case XML_HTML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
  case XML_NAMESPACE_DECL:
  case XML_XINCLUDE_START:
  case XML_XINCLUDE_END:
      break;
        case XML_ELEMENT_DECL:
        case XML_ATTRIBUTE_DECL:
        case XML_ENTITY_DECL:
      break;
    }
}

/**
 * xmlNodeAddContent:
 * @cur:  the node being modified
 * @content:  extra content
 *
 * Append the extra substring to the node content.
 * NOTE: In contrast to xmlNodeSetContent(), @content is supposed to be
 *       raw text, so unescaped XML special chars are allowed, entity
 *       references are not supported.
 */
void
xmlNodeAddContent(xmlNodePtr cur, const xmlChar *content) {
    int len;

    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNodeAddContent : node == NULL\n");
#endif
  return;
    }
    if (content == NULL) return;
    len = xmlStrlen(content);
    xmlNodeAddContentLen(cur, content, len);
}

/**
 * xmlTextMerge:
 * @first:  the first text node
 * @second:  the second text node being merged
 *
 * Merge two text nodes into one
 * Returns the first text node augmented
 */
xmlNodePtr
xmlTextMerge(xmlNodePtr first, xmlNodePtr second) {
    if (first == NULL) return(second);
    if (second == NULL) return(first);
    if (first->type != XML_TEXT_NODE) return(first);
    if (second->type != XML_TEXT_NODE) return(first);
    if (second->name != first->name)
  return(first);
    xmlNodeAddContent(first, second->content);
    xmlUnlinkNode(second);
    xmlFreeNode(second);
    return(first);
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlGetNsList:
 * @doc:  the document
 * @node:  the current node
 *
 * Search all the namespace applying to a given element.
 * Returns an NULL terminated array of all the #xmlNsPtr found
 *         that need to be freed by the caller or NULL if no
 *         namespace if defined
 */
xmlNsPtr *
xmlGetNsList(const xmlDoc *doc ATTRIBUTE_UNUSED, const xmlNode *node)
{
    xmlNsPtr cur;
    xmlNsPtr *ret = NULL;
    int nbns = 0;
    int maxns = 10;
    int i;

    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL))
        return(NULL);

    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE) {
            cur = node->nsDef;
            while (cur != NULL) {
                if (ret == NULL) {
                    ret =
                        (xmlNsPtr *) xmlMalloc((maxns + 1) *
                                               sizeof(xmlNsPtr));
                    if (ret == NULL) {
      xmlTreeErrMemory("getting namespace list");
                        return (NULL);
                    }
                    ret[nbns] = NULL;
                }
                for (i = 0; i < nbns; i++) {
                    if ((cur->prefix == ret[i]->prefix) ||
                        (xmlStrEqual(cur->prefix, ret[i]->prefix)))
                        break;
                }
                if (i >= nbns) {
                    if (nbns >= maxns) {
                        maxns *= 2;
                        ret = (xmlNsPtr *) xmlRealloc(ret,
                                                      (maxns +
                                                       1) *
                                                      sizeof(xmlNsPtr));
                        if (ret == NULL) {
          xmlTreeErrMemory("getting namespace list");
                            return (NULL);
                        }
                    }
                    ret[nbns++] = cur;
                    ret[nbns] = NULL;
                }

                cur = cur->next;
            }
        }
        node = node->parent;
    }
    return (ret);
}
#endif /* LIBXML_TREE_ENABLED */

/*
* xmlTreeEnsureXMLDecl:
* @doc: the doc
*
* Ensures that there is an XML namespace declaration on the doc.
*
* Returns the XML ns-struct or NULL on API and internal errors.
*/
static xmlNsPtr
xmlTreeEnsureXMLDecl(xmlDocPtr doc)
{
    if (doc == NULL)
  return (NULL);
    if (doc->oldNs != NULL)
  return (doc->oldNs);
    {
  xmlNsPtr ns;
  ns = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
  if (ns == NULL) {
      xmlTreeErrMemory(
    "allocating the XML namespace");
      return (NULL);
  }
  memset(ns, 0, sizeof(xmlNs));
  ns->type = XML_LOCAL_NAMESPACE;
  ns->href = xmlStrdup(XML_XML_NAMESPACE);
  ns->prefix = xmlStrdup((const xmlChar *)"xml");
  doc->oldNs = ns;
  return (ns);
    }
}

/**
 * xmlSearchNs:
 * @doc:  the document
 * @node:  the current node
 * @nameSpace:  the namespace prefix
 *
 * Search a Ns registered under a given name space for a document.
 * recurse on the parents until it finds the defined namespace
 * or return NULL otherwise.
 * @nameSpace can be NULL, this is a search for the default namespace.
 * We don't allow to cross entities boundaries. If you don't declare
 * the namespace within those you will be in troubles !!! A warning
 * is generated to cover this case.
 *
 * Returns the namespace pointer or NULL.
 */
xmlNsPtr
xmlSearchNs(xmlDocPtr doc, xmlNodePtr node, const xmlChar *nameSpace) {

    xmlNsPtr cur;
    const xmlNode *orig = node;

    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL)) return(NULL);
    if ((nameSpace != NULL) &&
  (xmlStrEqual(nameSpace, (const xmlChar *)"xml"))) {
  if ((doc == NULL) && (node->type == XML_ELEMENT_NODE)) {
      /*
       * The XML-1.0 namespace is normally held on the root
       * element. In this case exceptionally create it on the
       * node element.
       */
      cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
      if (cur == NULL) {
    xmlTreeErrMemory("searching namespace");
    return(NULL);
      }
      memset(cur, 0, sizeof(xmlNs));
      cur->type = XML_LOCAL_NAMESPACE;
      cur->href = xmlStrdup(XML_XML_NAMESPACE);
      cur->prefix = xmlStrdup((const xmlChar *)"xml");
      cur->next = node->nsDef;
      node->nsDef = cur;
      return(cur);
  }
  if (doc == NULL) {
      doc = node->doc;
      if (doc == NULL)
    return(NULL);
  }
  /*
  * Return the XML namespace declaration held by the doc.
  */
  if (doc->oldNs == NULL)
      return(xmlTreeEnsureXMLDecl(doc));
  else
      return(doc->oldNs);
    }
    while (node != NULL) {
  if ((node->type == XML_ENTITY_REF_NODE) ||
      (node->type == XML_ENTITY_NODE) ||
      (node->type == XML_ENTITY_DECL))
      return(NULL);
  if (node->type == XML_ELEMENT_NODE) {
      cur = node->nsDef;
      while (cur != NULL) {
    if ((cur->prefix == NULL) && (nameSpace == NULL) &&
        (cur->href != NULL))
        return(cur);
    if ((cur->prefix != NULL) && (nameSpace != NULL) &&
        (cur->href != NULL) &&
        (xmlStrEqual(cur->prefix, nameSpace)))
        return(cur);
    cur = cur->next;
      }
      if (orig != node) {
          cur = node->ns;
          if (cur != NULL) {
        if ((cur->prefix == NULL) && (nameSpace == NULL) &&
            (cur->href != NULL))
            return(cur);
        if ((cur->prefix != NULL) && (nameSpace != NULL) &&
            (cur->href != NULL) &&
            (xmlStrEqual(cur->prefix, nameSpace)))
            return(cur);
          }
      }
  }
  node = node->parent;
    }
    return(NULL);
}

/**
 * xmlNsInScope:
 * @doc:  the document
 * @node:  the current node
 * @ancestor:  the ancestor carrying the namespace
 * @prefix:  the namespace prefix
 *
 * Verify that the given namespace held on @ancestor is still in scope
 * on node.
 *
 * Returns 1 if true, 0 if false and -1 in case of error.
 */
static int
xmlNsInScope(xmlDocPtr doc ATTRIBUTE_UNUSED, xmlNodePtr node,
             xmlNodePtr ancestor, const xmlChar * prefix)
{
    xmlNsPtr tst;

    while ((node != NULL) && (node != ancestor)) {
        if ((node->type == XML_ENTITY_REF_NODE) ||
            (node->type == XML_ENTITY_NODE) ||
            (node->type == XML_ENTITY_DECL))
            return (-1);
        if (node->type == XML_ELEMENT_NODE) {
            tst = node->nsDef;
            while (tst != NULL) {
                if ((tst->prefix == NULL)
                    && (prefix == NULL))
                    return (0);
                if ((tst->prefix != NULL)
                    && (prefix != NULL)
                    && (xmlStrEqual(tst->prefix, prefix)))
                    return (0);
                tst = tst->next;
            }
        }
        node = node->parent;
    }
    if (node != ancestor)
        return (-1);
    return (1);
}

/**
 * xmlSearchNsByHref:
 * @doc:  the document
 * @node:  the current node
 * @href:  the namespace value
 *
 * Search a Ns aliasing a given URI. Recurse on the parents until it finds
 * the defined namespace or return NULL otherwise.
 * Returns the namespace pointer or NULL.
 */
xmlNsPtr
xmlSearchNsByHref(xmlDocPtr doc, xmlNodePtr node, const xmlChar * href)
{
    xmlNsPtr cur;
    xmlNodePtr orig = node;
    int is_attr;

    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL) || (href == NULL))
        return (NULL);
    if (xmlStrEqual(href, XML_XML_NAMESPACE)) {
        /*
         * Only the document can hold the XML spec namespace.
         */
        if ((doc == NULL) && (node->type == XML_ELEMENT_NODE)) {
            /*
             * The XML-1.0 namespace is normally held on the root
             * element. In this case exceptionally create it on the
             * node element.
             */
            cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
            if (cur == NULL) {
    xmlTreeErrMemory("searching namespace");
                return (NULL);
            }
            memset(cur, 0, sizeof(xmlNs));
            cur->type = XML_LOCAL_NAMESPACE;
            cur->href = xmlStrdup(XML_XML_NAMESPACE);
            cur->prefix = xmlStrdup((const xmlChar *) "xml");
            cur->next = node->nsDef;
            node->nsDef = cur;
            return (cur);
        }
  if (doc == NULL) {
      doc = node->doc;
      if (doc == NULL)
    return(NULL);
  }
  /*
  * Return the XML namespace declaration held by the doc.
  */
  if (doc->oldNs == NULL)
      return(xmlTreeEnsureXMLDecl(doc));
  else
      return(doc->oldNs);
    }
    is_attr = (node->type == XML_ATTRIBUTE_NODE);
    while (node != NULL) {
        if ((node->type == XML_ENTITY_REF_NODE) ||
            (node->type == XML_ENTITY_NODE) ||
            (node->type == XML_ENTITY_DECL))
            return (NULL);
        if (node->type == XML_ELEMENT_NODE) {
            cur = node->nsDef;
            while (cur != NULL) {
                if ((cur->href != NULL) && (href != NULL) &&
                    (xmlStrEqual(cur->href, href))) {
        if (((!is_attr) || (cur->prefix != NULL)) &&
            (xmlNsInScope(doc, orig, node, cur->prefix) == 1))
      return (cur);
                }
                cur = cur->next;
            }
            if (orig != node) {
                cur = node->ns;
                if (cur != NULL) {
                    if ((cur->href != NULL) && (href != NULL) &&
                        (xmlStrEqual(cur->href, href))) {
      if (((!is_attr) || (cur->prefix != NULL)) &&
                (xmlNsInScope(doc, orig, node, cur->prefix) == 1))
          return (cur);
                    }
                }
            }
        }
        node = node->parent;
    }
    return (NULL);
}

/**
 * xmlNewReconciledNs:
 * @doc:  the document
 * @tree:  a node expected to hold the new namespace
 * @ns:  the original namespace
 *
 * This function tries to locate a namespace definition in a tree
 * ancestors, or create a new namespace definition node similar to
 * @ns trying to reuse the same prefix. However if the given prefix is
 * null (default namespace) or reused within the subtree defined by
 * @tree or on one of its ancestors then a new prefix is generated.
 * Returns the (new) namespace definition or NULL in case of error
 */
static xmlNsPtr
xmlNewReconciledNs(xmlDocPtr doc, xmlNodePtr tree, xmlNsPtr ns) {
    xmlNsPtr def;
    xmlChar prefix[50];
    int counter = 1;

    if ((tree == NULL) || (tree->type != XML_ELEMENT_NODE)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewReconciledNs : tree == NULL\n");
#endif
  return(NULL);
    }
    if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
    "xmlNewReconciledNs : ns == NULL\n");
#endif
  return(NULL);
    }
    /*
     * Search an existing namespace definition inherited.
     */
    def = xmlSearchNsByHref(doc, tree, ns->href);
    if (def != NULL)
        return(def);

    /*
     * Find a close prefix which is not already in use.
     * Let's strip namespace prefixes longer than 20 chars !
     */
    if (ns->prefix == NULL)
  snprintf((char *) prefix, sizeof(prefix), "default");
    else
  snprintf((char *) prefix, sizeof(prefix), "%.20s", (char *)ns->prefix);

    def = xmlSearchNs(doc, tree, prefix);
    while (def != NULL) {
        if (counter > 1000) return(NULL);
  if (ns->prefix == NULL)
      snprintf((char *) prefix, sizeof(prefix), "default%d", counter++);
  else
      snprintf((char *) prefix, sizeof(prefix), "%.20s%d",
    (char *)ns->prefix, counter++);
  def = xmlSearchNs(doc, tree, prefix);
    }

    /*
     * OK, now we are ready to create a new one.
     */
    def = xmlNewNs(tree, ns->href, prefix);
    return(def);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlReconciliateNs:
 * @doc:  the document
 * @tree:  a node defining the subtree to reconciliate
 *
 * This function checks that all the namespaces declared within the given
 * tree are properly declared. This is needed for example after Copy or Cut
 * and then paste operations. The subtree may still hold pointers to
 * namespace declarations outside the subtree or invalid/masked. As much
 * as possible the function try to reuse the existing namespaces found in
 * the new environment. If not possible the new namespaces are redeclared
 * on @tree at the top of the given subtree.
 * Returns the number of namespace declarations created or -1 in case of error.
 */
int
xmlReconciliateNs(xmlDocPtr doc, xmlNodePtr tree) {
    xmlNsPtr *oldNs = NULL;
    xmlNsPtr *newNs = NULL;
    int sizeCache = 0;
    int nbCache = 0;

    xmlNsPtr n;
    xmlNodePtr node = tree;
    xmlAttrPtr attr;
    int ret = 0, i;

    if ((node == NULL) || (node->type != XML_ELEMENT_NODE)) return(-1);
    if ((doc == NULL) || (doc->type != XML_DOCUMENT_NODE)) return(-1);
    if (node->doc != doc) return(-1);
    while (node != NULL) {
        /*
   * Reconciliate the node namespace
   */
  if (node->ns != NULL) {
      /*
       * initialize the cache if needed
       */
      if (sizeCache == 0) {
    sizeCache = 10;
    oldNs = (xmlNsPtr *) xmlMalloc(sizeCache *
                 sizeof(xmlNsPtr));
    if (oldNs == NULL) {
        xmlTreeErrMemory("fixing namespaces");
        return(-1);
    }
    newNs = (xmlNsPtr *) xmlMalloc(sizeCache *
                 sizeof(xmlNsPtr));
    if (newNs == NULL) {
        xmlTreeErrMemory("fixing namespaces");
        xmlFree(oldNs);
        return(-1);
    }
      }
      for (i = 0;i < nbCache;i++) {
          if (oldNs[i] == node->ns) {
        node->ns = newNs[i];
        break;
    }
      }
      if (i == nbCache) {
          /*
     * OK we need to recreate a new namespace definition
     */
    n = xmlNewReconciledNs(doc, tree, node->ns);
    if (n != NULL) { /* :-( what if else ??? */
        /*
         * check if we need to grow the cache buffers.
         */
        if (sizeCache <= nbCache) {
            sizeCache *= 2;
      oldNs = (xmlNsPtr *) xmlRealloc(oldNs, sizeCache *
                                     sizeof(xmlNsPtr));
            if (oldNs == NULL) {
          xmlTreeErrMemory("fixing namespaces");
          xmlFree(newNs);
          return(-1);
      }
      newNs = (xmlNsPtr *) xmlRealloc(newNs, sizeCache *
                                     sizeof(xmlNsPtr));
            if (newNs == NULL) {
          xmlTreeErrMemory("fixing namespaces");
          xmlFree(oldNs);
          return(-1);
      }
        }
        newNs[nbCache] = n;
        oldNs[nbCache++] = node->ns;
        node->ns = n;
                }
      }
  }
  /*
   * now check for namespace held by attributes on the node.
   */
  if (node->type == XML_ELEMENT_NODE) {
      attr = node->properties;
      while (attr != NULL) {
    if (attr->ns != NULL) {
        /*
         * initialize the cache if needed
         */
        if (sizeCache == 0) {
      sizeCache = 10;
      oldNs = (xmlNsPtr *) xmlMalloc(sizeCache *
                   sizeof(xmlNsPtr));
      if (oldNs == NULL) {
          xmlTreeErrMemory("fixing namespaces");
          return(-1);
      }
      newNs = (xmlNsPtr *) xmlMalloc(sizeCache *
                   sizeof(xmlNsPtr));
      if (newNs == NULL) {
          xmlTreeErrMemory("fixing namespaces");
          xmlFree(oldNs);
          return(-1);
      }
        }
        for (i = 0;i < nbCache;i++) {
      if (oldNs[i] == attr->ns) {
          attr->ns = newNs[i];
          break;
      }
        }
        if (i == nbCache) {
      /*
       * OK we need to recreate a new namespace definition
       */
      n = xmlNewReconciledNs(doc, tree, attr->ns);
      if (n != NULL) { /* :-( what if else ??? */
          /*
           * check if we need to grow the cache buffers.
           */
          if (sizeCache <= nbCache) {
        sizeCache *= 2;
        oldNs = (xmlNsPtr *) xmlRealloc(oldNs,
                   sizeCache * sizeof(xmlNsPtr));
        if (oldNs == NULL) {
            xmlTreeErrMemory("fixing namespaces");
            xmlFree(newNs);
            return(-1);
        }
        newNs = (xmlNsPtr *) xmlRealloc(newNs,
                   sizeCache * sizeof(xmlNsPtr));
        if (newNs == NULL) {
            xmlTreeErrMemory("fixing namespaces");
            xmlFree(oldNs);
            return(-1);
        }
          }
          newNs[nbCache] = n;
          oldNs[nbCache++] = attr->ns;
          attr->ns = n;
      }
        }
    }
    attr = attr->next;
      }
  }

  /*
   * Browse the full subtree, deep first
   */
        if ((node->children != NULL) && (node->type != XML_ENTITY_REF_NODE)) {
      /* deep first */
      node = node->children;
  } else if ((node != tree) && (node->next != NULL)) {
      /* then siblings */
      node = node->next;
  } else if (node != tree) {
      /* go up to parents->next if needed */
      while (node != tree) {
          if (node->parent != NULL)
        node = node->parent;
    if ((node != tree) && (node->next != NULL)) {
        node = node->next;
        break;
    }
    if (node->parent == NULL) {
        node = NULL;
        break;
    }
      }
      /* exit condition */
      if (node == tree)
          node = NULL;
  } else
      break;
    }
    if (oldNs != NULL)
  xmlFree(oldNs);
    if (newNs != NULL)
  xmlFree(newNs);
    return(ret);
}
#endif /* LIBXML_TREE_ENABLED */

static xmlAttrPtr
xmlGetPropNodeInternal(const xmlNode *node, const xmlChar *name,
           const xmlChar *nsName, int useDTD)
{
    xmlAttrPtr prop;

    /* Avoid unused variable warning if features are disabled. */
    (void) useDTD;

    if ((node == NULL) || (node->type != XML_ELEMENT_NODE) || (name == NULL))
  return(NULL);

    if (node->properties != NULL) {
  prop = node->properties;
  if (nsName == NULL) {
      /*
      * We want the attr to be in no namespace.
      */
      do {
    if ((prop->ns == NULL) && xmlStrEqual(prop->name, name)) {
        return(prop);
    }
    prop = prop->next;
      } while (prop != NULL);
  } else {
      /*
      * We want the attr to be in the specified namespace.
      */
      do {
    if ((prop->ns != NULL) && xmlStrEqual(prop->name, name) &&
        ((prop->ns->href == nsName) ||
         xmlStrEqual(prop->ns->href, nsName)))
    {
        return(prop);
    }
    prop = prop->next;
      } while (prop != NULL);
  }
    }

#ifdef LIBXML_TREE_ENABLED
    if (! useDTD)
  return(NULL);
    /*
     * Check if there is a default/fixed attribute declaration in
     * the internal or external subset.
     */
    if ((node->doc != NULL) && (node->doc->intSubset != NULL)) {
  xmlDocPtr doc = node->doc;
  xmlAttributePtr attrDecl = NULL;
  xmlChar *elemQName, *tmpstr = NULL;

  /*
  * We need the QName of the element for the DTD-lookup.
  */
  if ((node->ns != NULL) && (node->ns->prefix != NULL)) {
      tmpstr = xmlStrdup(node->ns->prefix);
      tmpstr = xmlStrcat(tmpstr, BAD_CAST ":");
      tmpstr = xmlStrcat(tmpstr, node->name);
      if (tmpstr == NULL)
    return(NULL);
      elemQName = tmpstr;
  } else
      elemQName = (xmlChar *) node->name;
  if (nsName == NULL) {
      /*
      * The common and nice case: Attr in no namespace.
      */
      attrDecl = xmlGetDtdQAttrDesc(doc->intSubset,
    elemQName, name, NULL);
      if ((attrDecl == NULL) && (doc->extSubset != NULL)) {
    attrDecl = xmlGetDtdQAttrDesc(doc->extSubset,
        elemQName, name, NULL);
      }
        } else if (xmlStrEqual(nsName, XML_XML_NAMESPACE)) {
      /*
      * The XML namespace must be bound to prefix 'xml'.
      */
      attrDecl = xmlGetDtdQAttrDesc(doc->intSubset,
    elemQName, name, BAD_CAST "xml");
      if ((attrDecl == NULL) && (doc->extSubset != NULL)) {
    attrDecl = xmlGetDtdQAttrDesc(doc->extSubset,
        elemQName, name, BAD_CAST "xml");
      }
  } else {
      xmlNsPtr *nsList, *cur;

      /*
      * The ugly case: Search using the prefixes of in-scope
      * ns-decls corresponding to @nsName.
      */
      nsList = xmlGetNsList(node->doc, node);
      if (nsList == NULL) {
    if (tmpstr != NULL)
        xmlFree(tmpstr);
    return(NULL);
      }
      cur = nsList;
      while (*cur != NULL) {
    if (xmlStrEqual((*cur)->href, nsName)) {
        attrDecl = xmlGetDtdQAttrDesc(doc->intSubset, elemQName,
      name, (*cur)->prefix);
        if (attrDecl)
      break;
        if (doc->extSubset != NULL) {
      attrDecl = xmlGetDtdQAttrDesc(doc->extSubset, elemQName,
          name, (*cur)->prefix);
      if (attrDecl)
          break;
        }
    }
    cur++;
      }
      xmlFree(nsList);
  }
  if (tmpstr != NULL)
      xmlFree(tmpstr);
  /*
  * Only default/fixed attrs are relevant.
  */
  if ((attrDecl != NULL) && (attrDecl->defaultValue != NULL))
      return((xmlAttrPtr) attrDecl);
    }
#endif /* LIBXML_TREE_ENABLED */
    return(NULL);
}

static xmlChar*
xmlGetPropNodeValueInternal(const xmlAttr *prop)
{
    if (prop == NULL)
  return(NULL);
    if (prop->type == XML_ATTRIBUTE_NODE) {
  /*
  * Note that we return at least the empty string.
  *   TODO: Do we really always want that?
  */
  if (prop->children != NULL) {
      if ((prop->children->next == NULL) &&
    ((prop->children->type == XML_TEXT_NODE) ||
    (prop->children->type == XML_CDATA_SECTION_NODE)))
      {
    /*
    * Optimization for the common case: only 1 text node.
    */
    return(xmlStrdup(prop->children->content));
      } else {
    xmlChar *ret;

    ret = xmlNodeListGetString(prop->doc, prop->children, 1);
    if (ret != NULL)
        return(ret);
      }
  }
  return(xmlStrdup((xmlChar *)""));
    } else if (prop->type == XML_ATTRIBUTE_DECL) {
  return(xmlStrdup(((xmlAttributePtr)prop)->defaultValue));
    }
    return(NULL);
}

/**
 * xmlHasProp:
 * @node:  the node
 * @name:  the attribute name
 *
 * Search an attribute associated to a node
 * This function also looks in DTD attribute declaration for #FIXED or
 * default declaration values unless DTD use has been turned off.
 *
 * Returns the attribute or the attribute declaration or NULL if
 *         neither was found.
 */
xmlAttrPtr
xmlHasProp(const xmlNode *node, const xmlChar *name) {
    xmlAttrPtr prop;
    xmlDocPtr doc;

    if ((node == NULL) || (node->type != XML_ELEMENT_NODE) || (name == NULL))
        return(NULL);
    /*
     * Check on the properties attached to the node
     */
    prop = node->properties;
    while (prop != NULL) {
        if (xmlStrEqual(prop->name, name))  {
      return(prop);
        }
  prop = prop->next;
    }
    if (!xmlCheckDTD) return(NULL);

    /*
     * Check if there is a default declaration in the internal
     * or external subsets
     */
    doc =  node->doc;
    if (doc != NULL) {
        xmlAttributePtr attrDecl;
        if (doc->intSubset != NULL) {
      attrDecl = xmlGetDtdAttrDesc(doc->intSubset, node->name, name);
      if ((attrDecl == NULL) && (doc->extSubset != NULL))
    attrDecl = xmlGetDtdAttrDesc(doc->extSubset, node->name, name);
            if ((attrDecl != NULL) && (attrDecl->defaultValue != NULL))
              /* return attribute declaration only if a default value is given
                 (that includes #FIXED declarations) */
    return((xmlAttrPtr) attrDecl);
  }
    }
    return(NULL);
}

/**
 * xmlHasNsProp:
 * @node:  the node
 * @name:  the attribute name
 * @nameSpace:  the URI of the namespace
 *
 * Search for an attribute associated to a node
 * This attribute has to be anchored in the namespace specified.
 * This does the entity substitution.
 * This function looks in DTD attribute declaration for #FIXED or
 * default declaration values unless DTD use has been turned off.
 * Note that a namespace of NULL indicates to use the default namespace.
 *
 * Returns the attribute or the attribute declaration or NULL
 *     if neither was found.
 */
xmlAttrPtr
xmlHasNsProp(const xmlNode *node, const xmlChar *name, const xmlChar *nameSpace) {

    return(xmlGetPropNodeInternal(node, name, nameSpace, xmlCheckDTD));
}

/**
 * xmlGetProp:
 * @node:  the node
 * @name:  the attribute name
 *
 * Search and get the value of an attribute associated to a node
 * This does the entity substitution.
 * This function looks in DTD attribute declaration for #FIXED or
 * default declaration values unless DTD use has been turned off.
 * NOTE: this function acts independently of namespaces associated
 *       to the attribute. Use xmlGetNsProp() or xmlGetNoNsProp()
 *       for namespace aware processing.
 *
 * Returns the attribute value or NULL if not found.
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlGetProp(const xmlNode *node, const xmlChar *name) {
    xmlAttrPtr prop;

    prop = xmlHasProp(node, name);
    if (prop == NULL)
  return(NULL);
    return(xmlGetPropNodeValueInternal(prop));
}

/**
 * xmlGetNoNsProp:
 * @node:  the node
 * @name:  the attribute name
 *
 * Search and get the value of an attribute associated to a node
 * This does the entity substitution.
 * This function looks in DTD attribute declaration for #FIXED or
 * default declaration values unless DTD use has been turned off.
 * This function is similar to xmlGetProp except it will accept only
 * an attribute in no namespace.
 *
 * Returns the attribute value or NULL if not found.
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlGetNoNsProp(const xmlNode *node, const xmlChar *name) {
    xmlAttrPtr prop;

    prop = xmlGetPropNodeInternal(node, name, NULL, xmlCheckDTD);
    if (prop == NULL)
  return(NULL);
    return(xmlGetPropNodeValueInternal(prop));
}

/**
 * xmlGetNsProp:
 * @node:  the node
 * @name:  the attribute name
 * @nameSpace:  the URI of the namespace
 *
 * Search and get the value of an attribute associated to a node
 * This attribute has to be anchored in the namespace specified.
 * This does the entity substitution.
 * This function looks in DTD attribute declaration for #FIXED or
 * default declaration values unless DTD use has been turned off.
 *
 * Returns the attribute value or NULL if not found.
 *     It's up to the caller to free the memory with xmlFree().
 */
xmlChar *
xmlGetNsProp(const xmlNode *node, const xmlChar *name, const xmlChar *nameSpace) {
    xmlAttrPtr prop;

    prop = xmlGetPropNodeInternal(node, name, nameSpace, xmlCheckDTD);
    if (prop == NULL)
  return(NULL);
    return(xmlGetPropNodeValueInternal(prop));
}

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlUnsetProp:
 * @node:  the node
 * @name:  the attribute name
 *
 * Remove an attribute carried by a node.
 * This handles only attributes in no namespace.
 * Returns 0 if successful, -1 if not found
 */
int
xmlUnsetProp(xmlNodePtr node, const xmlChar *name) {
    xmlAttrPtr prop;

    prop = xmlGetPropNodeInternal(node, name, NULL, 0);
    if (prop == NULL)
  return(-1);
    xmlUnlinkNode((xmlNodePtr) prop);
    xmlFreeProp(prop);
    return(0);
}

/**
 * xmlUnsetNsProp:
 * @node:  the node
 * @ns:  the namespace definition
 * @name:  the attribute name
 *
 * Remove an attribute carried by a node.
 * Returns 0 if successful, -1 if not found
 */
int
xmlUnsetNsProp(xmlNodePtr node, xmlNsPtr ns, const xmlChar *name) {
    xmlAttrPtr prop;

    prop = xmlGetPropNodeInternal(node, name, (ns != NULL) ? ns->href : NULL, 0);
    if (prop == NULL)
  return(-1);
    xmlUnlinkNode((xmlNodePtr) prop);
    xmlFreeProp(prop);
    return(0);
}
#endif

#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_XINCLUDE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED) || defined(LIBXML_HTML_ENABLED)
/**
 * xmlSetProp:
 * @node:  the node
 * @name:  the attribute name (a QName)
 * @value:  the attribute value
 *
 * Set (or reset) an attribute carried by a node.
 * If @name has a prefix, then the corresponding
 * namespace-binding will be used, if in scope; it is an
 * error it there's no such ns-binding for the prefix in
 * scope.
 * Returns the attribute pointer.
 *
 */
xmlAttrPtr
xmlSetProp(xmlNodePtr node, const xmlChar *name, const xmlChar *value) {
    int len;
    const xmlChar *nqname;

    if ((node == NULL) || (name == NULL) || (node->type != XML_ELEMENT_NODE))
  return(NULL);

    /*
     * handle QNames
     */
    nqname = xmlSplitQName3(name, &len);
    if (nqname != NULL) {
        xmlNsPtr ns;
  xmlChar *prefix = xmlStrndup(name, len);
  ns = xmlSearchNs(node->doc, node, prefix);
  if (prefix != NULL)
      xmlFree(prefix);
  if (ns != NULL)
      return(xmlSetNsProp(node, ns, nqname, value));
    }
    return(xmlSetNsProp(node, NULL, name, value));
}

/**
 * xmlSetNsProp:
 * @node:  the node
 * @ns:  the namespace definition
 * @name:  the attribute name
 * @value:  the attribute value
 *
 * Set (or reset) an attribute carried by a node.
 * The ns structure must be in scope, this is not checked
 *
 * Returns the attribute pointer.
 */
xmlAttrPtr
xmlSetNsProp(xmlNodePtr node, xmlNsPtr ns, const xmlChar *name,
       const xmlChar *value)
{
    xmlAttrPtr prop;

    if (ns && (ns->href == NULL))
  return(NULL);
    prop = xmlGetPropNodeInternal(node, name, (ns != NULL) ? ns->href : NULL, 0);
    if (prop != NULL) {
  /*
  * Modify the attribute's value.
  */
  if (prop->atype == XML_ATTRIBUTE_ID) {
      xmlRemoveID(node->doc, prop);
      prop->atype = XML_ATTRIBUTE_ID;
  }
  if (prop->children != NULL)
      xmlFreeNodeList(prop->children);
  prop->children = NULL;
  prop->last = NULL;
  prop->ns = ns;
  if (value != NULL) {
      xmlNodePtr tmp;

      prop->children = xmlNewDocText(node->doc, value);
      prop->last = NULL;
      tmp = prop->children;
      while (tmp != NULL) {
    tmp->parent = (xmlNodePtr) prop;
    if (tmp->next == NULL)
        prop->last = tmp;
    tmp = tmp->next;
      }
  }
  if (prop->atype == XML_ATTRIBUTE_ID)
      xmlAddID(NULL, node->doc, value, prop);
  return(prop);
    }
    /*
    * No equal attr found; create a new one.
    */
    return(xmlNewPropInternal(node, ns, name, value, 0));
}

#endif /* LIBXML_TREE_ENABLED */

/**
 * xmlNodeIsText:
 * @node:  the node
 *
 * Is this node a Text node ?
 * Returns 1 yes, 0 no
 */
int
xmlNodeIsText(const xmlNode *node) {
    if (node == NULL) return(0);

    if (node->type == XML_TEXT_NODE) return(1);
    return(0);
}

/**
 * xmlIsBlankNode:
 * @node:  the node
 *
 * Checks whether this node is an empty or whitespace only
 * (and possibly ignorable) text-node.
 *
 * Returns 1 yes, 0 no
 */
int
xmlIsBlankNode(const xmlNode *node) {
    const xmlChar *cur;
    if (node == NULL) return(0);

    if ((node->type != XML_TEXT_NODE) &&
        (node->type != XML_CDATA_SECTION_NODE))
  return(0);
    if (node->content == NULL) return(1);
    cur = node->content;
    while (*cur != 0) {
  if (!IS_BLANK_CH(*cur)) return(0);
  cur++;
    }

    return(1);
}

/**
 * xmlTextConcat:
 * @node:  the node
 * @content:  the content
 * @len:  @content length
 *
 * Concat the given string at the end of the existing node content
 *
 * Returns -1 in case of error, 0 otherwise
 */

int
xmlTextConcat(xmlNodePtr node, const xmlChar *content, int len) {
    if (node == NULL) return(-1);

    if ((node->type != XML_TEXT_NODE) &&
        (node->type != XML_CDATA_SECTION_NODE) &&
  (node->type != XML_COMMENT_NODE) &&
  (node->type != XML_PI_NODE)) {
#ifdef DEBUG_TREE
  xmlGenericError(xmlGenericErrorContext,
    "xmlTextConcat: node is not text nor CDATA\n");
#endif
        return(-1);
    }
    /* need to check if content is currently in the dictionary */
    if ((node->content == (xmlChar *) &(node->properties)) ||
        ((node->doc != NULL) && (node->doc->dict != NULL) &&
    xmlDictOwns(node->doc->dict, node->content))) {
  node->content = xmlStrncatNew(node->content, content, len);
    } else {
        node->content = xmlStrncat(node->content, content, len);
    }
    node->properties = NULL;
    if (node->content == NULL)
        return(-1);
    return(0);
}

/************************************************************************
 *                  *
 *      Output : to a FILE or in memory     *
 *                  *
 ************************************************************************/

/**
 * xmlBufferCreate:
 *
 * routine to create an XML buffer.
 * returns the new structure.
 */
xmlBufferPtr
xmlBufferCreate(void) {
    xmlBufferPtr ret;

    ret = (xmlBufferPtr) xmlMalloc(sizeof(xmlBuffer));
    if (ret == NULL) {
  xmlTreeErrMemory("creating buffer");
        return(NULL);
    }
    ret->use = 0;
    ret->size = xmlDefaultBufferSize;
    ret->alloc = xmlBufferAllocScheme;
    ret->content = (xmlChar *) xmlMallocAtomic(ret->size);
    if (ret->content == NULL) {
  xmlTreeErrMemory("creating buffer");
  xmlFree(ret);
        return(NULL);
    }
    ret->content[0] = 0;
    ret->contentIO = NULL;
    return(ret);
}

/**
 * xmlBufferCreateSize:
 * @size: initial size of buffer
 *
 * routine to create an XML buffer.
 * returns the new structure.
 */
xmlBufferPtr
xmlBufferCreateSize(size_t size) {
    xmlBufferPtr ret;

    if (size >= UINT_MAX)
        return(NULL);
    ret = (xmlBufferPtr) xmlMalloc(sizeof(xmlBuffer));
    if (ret == NULL) {
  xmlTreeErrMemory("creating buffer");
        return(NULL);
    }
    ret->use = 0;
    ret->alloc = xmlBufferAllocScheme;
    ret->size = (size ? size + 1 : 0);         /* +1 for ending null */
    if (ret->size){
        ret->content = (xmlChar *) xmlMallocAtomic(ret->size);
        if (ret->content == NULL) {
      xmlTreeErrMemory("creating buffer");
            xmlFree(ret);
            return(NULL);
        }
        ret->content[0] = 0;
    } else
  ret->content = NULL;
    ret->contentIO = NULL;
    return(ret);
}

/**
 * xmlBufferDetach:
 * @buf:  the buffer
 *
 * Remove the string contained in a buffer and gie it back to the
 * caller. The buffer is reset to an empty content.
 * This doesn't work with immutable buffers as they can't be reset.
 *
 * Returns the previous string contained by the buffer.
 */
xmlChar *
xmlBufferDetach(xmlBufferPtr buf) {
    xmlChar *ret;

    if (buf == NULL)
        return(NULL);
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE)
        return(NULL);

    ret = buf->content;
    buf->content = NULL;
    buf->size = 0;
    buf->use = 0;

    return ret;
}


/**
 * xmlBufferCreateStatic:
 * @mem: the memory area
 * @size:  the size in byte
 *
 * routine to create an XML buffer from an immutable memory area.
 * The area won't be modified nor copied, and is expected to be
 * present until the end of the buffer lifetime.
 *
 * returns the new structure.
 */
xmlBufferPtr
xmlBufferCreateStatic(void *mem, size_t size) {
    xmlBufferPtr ret;

    if ((mem == NULL) || (size == 0))
        return(NULL);
    if (size > UINT_MAX)
        return(NULL);

    ret = (xmlBufferPtr) xmlMalloc(sizeof(xmlBuffer));
    if (ret == NULL) {
  xmlTreeErrMemory("creating buffer");
        return(NULL);
    }
    ret->use = size;
    ret->size = size;
    ret->alloc = XML_BUFFER_ALLOC_IMMUTABLE;
    ret->content = (xmlChar *) mem;
    return(ret);
}

/**
 * xmlBufferSetAllocationScheme:
 * @buf:  the buffer to tune
 * @scheme:  allocation scheme to use
 *
 * Sets the allocation scheme for this buffer
 */
void
xmlBufferSetAllocationScheme(xmlBufferPtr buf,
                             xmlBufferAllocationScheme scheme) {
    if (buf == NULL) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferSetAllocationScheme: buf == NULL\n");
#endif
        return;
    }
    if ((buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) ||
        (buf->alloc == XML_BUFFER_ALLOC_IO)) return;
    if ((scheme == XML_BUFFER_ALLOC_DOUBLEIT) ||
        (scheme == XML_BUFFER_ALLOC_EXACT) ||
        (scheme == XML_BUFFER_ALLOC_HYBRID) ||
        (scheme == XML_BUFFER_ALLOC_IMMUTABLE))
  buf->alloc = scheme;
}

/**
 * xmlBufferFree:
 * @buf:  the buffer to free
 *
 * Frees an XML buffer. It frees both the content and the structure which
 * encapsulate it.
 */
void
xmlBufferFree(xmlBufferPtr buf) {
    if (buf == NULL) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferFree: buf == NULL\n");
#endif
  return;
    }

    if ((buf->alloc == XML_BUFFER_ALLOC_IO) &&
        (buf->contentIO != NULL)) {
        xmlFree(buf->contentIO);
    } else if ((buf->content != NULL) &&
        (buf->alloc != XML_BUFFER_ALLOC_IMMUTABLE)) {
        xmlFree(buf->content);
    }
    xmlFree(buf);
}

/**
 * xmlBufferEmpty:
 * @buf:  the buffer
 *
 * empty a buffer.
 */
void
xmlBufferEmpty(xmlBufferPtr buf) {
    if (buf == NULL) return;
    if (buf->content == NULL) return;
    buf->use = 0;
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) {
        buf->content = BAD_CAST "";
    } else if ((buf->alloc == XML_BUFFER_ALLOC_IO) &&
               (buf->contentIO != NULL)) {
        size_t start_buf = buf->content - buf->contentIO;

  buf->size += start_buf;
        buf->content = buf->contentIO;
        buf->content[0] = 0;
    } else {
        buf->content[0] = 0;
    }
}

/**
 * xmlBufferShrink:
 * @buf:  the buffer to dump
 * @len:  the number of xmlChar to remove
 *
 * Remove the beginning of an XML buffer.
 *
 * Returns the number of #xmlChar removed, or -1 in case of failure.
 */
int
xmlBufferShrink(xmlBufferPtr buf, unsigned int len) {
    if (buf == NULL) return(-1);
    if (len == 0) return(0);
    if (len > buf->use) return(-1);

    buf->use -= len;
    if ((buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) ||
        ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL))) {
  /*
   * we just move the content pointer, but also make sure
   * the perceived buffer size has shrunk accordingly
   */
        buf->content += len;
  buf->size -= len;

        /*
   * sometimes though it maybe be better to really shrink
   * on IO buffers
   */
  if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
      size_t start_buf = buf->content - buf->contentIO;
      if (start_buf >= buf->size) {
    memmove(buf->contentIO, &buf->content[0], buf->use);
    buf->content = buf->contentIO;
    buf->content[buf->use] = 0;
    buf->size += start_buf;
      }
  }
    } else {
  memmove(buf->content, &buf->content[len], buf->use);
  buf->content[buf->use] = 0;
    }
    return(len);
}

/**
 * xmlBufferGrow:
 * @buf:  the buffer
 * @len:  the minimum free size to allocate
 *
 * Grow the available space of an XML buffer.
 *
 * Returns the new available space or -1 in case of error
 */
int
xmlBufferGrow(xmlBufferPtr buf, unsigned int len) {
    unsigned int size;
    xmlChar *newbuf;

    if (buf == NULL) return(-1);

    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return(0);
    if (len < buf->size - buf->use)
        return(0);
    if (len >= UINT_MAX - buf->use) {
        xmlTreeErrMemory("growing buffer past UINT_MAX");
        return(-1);
    }

    if (buf->size > (size_t) len) {
        size = buf->size > UINT_MAX / 2 ? UINT_MAX : buf->size * 2;
    } else {
        size = buf->use + len;
        size = size > UINT_MAX - 100 ? UINT_MAX : size + 100;
    }

    if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
        size_t start_buf = buf->content - buf->contentIO;

  newbuf = (xmlChar *) xmlRealloc(buf->contentIO, start_buf + size);
  if (newbuf == NULL) {
      xmlTreeErrMemory("growing buffer");
      return(-1);
  }
  buf->contentIO = newbuf;
  buf->content = newbuf + start_buf;
    } else {
  newbuf = (xmlChar *) xmlRealloc(buf->content, size);
  if (newbuf == NULL) {
      xmlTreeErrMemory("growing buffer");
      return(-1);
  }
  buf->content = newbuf;
    }
    buf->size = size;
    return(buf->size - buf->use - 1);
}

/**
 * xmlBufferDump:
 * @file:  the file output
 * @buf:  the buffer to dump
 *
 * Dumps an XML buffer to  a FILE *.
 * Returns the number of #xmlChar written
 */
int
xmlBufferDump(FILE *file, xmlBufferPtr buf) {
    size_t ret;

    if (buf == NULL) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferDump: buf == NULL\n");
#endif
  return(0);
    }
    if (buf->content == NULL) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferDump: buf->content == NULL\n");
#endif
  return(0);
    }
    if (file == NULL)
  file = stdout;
    ret = fwrite(buf->content, 1, buf->use, file);
    return(ret > INT_MAX ? INT_MAX : ret);
}

/**
 * xmlBufferContent:
 * @buf:  the buffer
 *
 * Function to extract the content of a buffer
 *
 * Returns the internal content
 */

const xmlChar *
xmlBufferContent(const xmlBuffer *buf)
{
    if(!buf)
        return NULL;

    return buf->content;
}

/**
 * xmlBufferLength:
 * @buf:  the buffer
 *
 * Function to get the length of a buffer
 *
 * Returns the length of data in the internal content
 */

int
xmlBufferLength(const xmlBuffer *buf)
{
    if(!buf)
        return 0;

    return buf->use;
}

/**
 * xmlBufferResize:
 * @buf:  the buffer to resize
 * @size:  the desired size
 *
 * Resize a buffer to accommodate minimum size of @size.
 *
 * Returns  0 in case of problems, 1 otherwise
 */
int
xmlBufferResize(xmlBufferPtr buf, unsigned int size)
{
    unsigned int newSize;
    xmlChar* rebuf = NULL;
    size_t start_buf;

    if (buf == NULL)
        return(0);

    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return(0);

    /* Don't resize if we don't have to */
    if (size < buf->size)
        return 1;

    if (size > UINT_MAX - 10) {
        xmlTreeErrMemory("growing buffer past UINT_MAX");
        return 0;
    }

    /* figure out new size */
    switch (buf->alloc){
  case XML_BUFFER_ALLOC_IO:
  case XML_BUFFER_ALLOC_DOUBLEIT:
      /*take care of empty case*/
            if (buf->size == 0)
                newSize = (size > UINT_MAX - 10 ? UINT_MAX : size + 10);
            else
                newSize = buf->size;
      while (size > newSize) {
          if (newSize > UINT_MAX / 2) {
              xmlTreeErrMemory("growing buffer");
              return 0;
          }
          newSize *= 2;
      }
      break;
  case XML_BUFFER_ALLOC_EXACT:
      newSize = (size > UINT_MAX - 10 ? UINT_MAX : size + 10);
      break;
        case XML_BUFFER_ALLOC_HYBRID:
            if (buf->use < BASE_BUFFER_SIZE)
                newSize = size;
            else {
                newSize = buf->size;
                while (size > newSize) {
                    if (newSize > UINT_MAX / 2) {
                        xmlTreeErrMemory("growing buffer");
                        return 0;
                    }
                    newSize *= 2;
                }
            }
            break;

  default:
      newSize = (size > UINT_MAX - 10 ? UINT_MAX : size + 10);
      break;
    }

    if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
        start_buf = buf->content - buf->contentIO;

        if (start_buf > newSize) {
      /* move data back to start */
      memmove(buf->contentIO, buf->content, buf->use);
      buf->content = buf->contentIO;
      buf->content[buf->use] = 0;
      buf->size += start_buf;
  } else {
      rebuf = (xmlChar *) xmlRealloc(buf->contentIO, start_buf + newSize);
      if (rebuf == NULL) {
    xmlTreeErrMemory("growing buffer");
    return 0;
      }
      buf->contentIO = rebuf;
      buf->content = rebuf + start_buf;
  }
    } else {
  if (buf->content == NULL) {
      rebuf = (xmlChar *) xmlMallocAtomic(newSize);
      buf->use = 0;
      rebuf[buf->use] = 0;
  } else if (buf->size - buf->use < 100) {
      rebuf = (xmlChar *) xmlRealloc(buf->content, newSize);
        } else {
      /*
       * if we are reallocating a buffer far from being full, it's
       * better to make a new allocation and copy only the used range
       * and free the old one.
       */
      rebuf = (xmlChar *) xmlMallocAtomic(newSize);
      if (rebuf != NULL) {
    memcpy(rebuf, buf->content, buf->use);
    xmlFree(buf->content);
    rebuf[buf->use] = 0;
      }
  }
  if (rebuf == NULL) {
      xmlTreeErrMemory("growing buffer");
      return 0;
  }
  buf->content = rebuf;
    }
    buf->size = newSize;

    return 1;
}

/**
 * xmlBufferAdd:
 * @buf:  the buffer to dump
 * @str:  the #xmlChar string
 * @len:  the number of #xmlChar to add
 *
 * Add a string range to an XML buffer. if len == -1, the length of
 * str is recomputed.
 *
 * Returns 0 successful, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlBufferAdd(xmlBufferPtr buf, const xmlChar *str, int len) {
    unsigned int needSize;

    if ((str == NULL) || (buf == NULL)) {
  return -1;
    }
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
    if (len < -1) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferAdd: len < 0\n");
#endif
  return -1;
    }
    if (len == 0) return 0;

    if (len < 0)
        len = xmlStrlen(str);

    if (len < 0) return -1;
    if (len == 0) return 0;

    /* Note that both buf->size and buf->use can be zero here. */
    if ((unsigned) len >= buf->size - buf->use) {
        if ((unsigned) len >= UINT_MAX - buf->use) {
            xmlTreeErrMemory("growing buffer past UINT_MAX");
            return XML_ERR_NO_MEMORY;
        }
        needSize = buf->use + len + 1;
        if (!xmlBufferResize(buf, needSize)){
      xmlTreeErrMemory("growing buffer");
            return XML_ERR_NO_MEMORY;
        }
    }

    memmove(&buf->content[buf->use], str, len);
    buf->use += len;
    buf->content[buf->use] = 0;
    return 0;
}

/**
 * xmlBufferAddHead:
 * @buf:  the buffer
 * @str:  the #xmlChar string
 * @len:  the number of #xmlChar to add
 *
 * Add a string range to the beginning of an XML buffer.
 * if len == -1, the length of @str is recomputed.
 *
 * Returns 0 successful, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlBufferAddHead(xmlBufferPtr buf, const xmlChar *str, int len) {
    unsigned int needSize;

    if (buf == NULL)
        return(-1);
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
    if (str == NULL) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferAddHead: str == NULL\n");
#endif
  return -1;
    }
    if (len < -1) {
#ifdef DEBUG_BUFFER
        xmlGenericError(xmlGenericErrorContext,
    "xmlBufferAddHead: len < 0\n");
#endif
  return -1;
    }
    if (len == 0) return 0;

    if (len < 0)
        len = xmlStrlen(str);

    if (len <= 0) return -1;

    if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
        size_t start_buf = buf->content - buf->contentIO;

  if (start_buf > (unsigned int) len) {
      /*
       * We can add it in the space previously shrunk
       */
      buf->content -= len;
            memmove(&buf->content[0], str, len);
      buf->use += len;
      buf->size += len;
            buf->content[buf->use] = 0;
      return(0);
  }
    }
    /* Note that both buf->size and buf->use can be zero here. */
    if ((unsigned) len >= buf->size - buf->use) {
        if ((unsigned) len >= UINT_MAX - buf->use) {
            xmlTreeErrMemory("growing buffer past UINT_MAX");
            return(-1);
        }
        needSize = buf->use + len + 1;
        if (!xmlBufferResize(buf, needSize)){
      xmlTreeErrMemory("growing buffer");
            return XML_ERR_NO_MEMORY;
        }
    }

    memmove(&buf->content[len], &buf->content[0], buf->use);
    memmove(&buf->content[0], str, len);
    buf->use += len;
    buf->content[buf->use] = 0;
    return 0;
}

/**
 * xmlBufferCat:
 * @buf:  the buffer to add to
 * @str:  the #xmlChar string
 *
 * Append a zero terminated string to an XML buffer.
 *
 * Returns 0 successful, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlBufferCat(xmlBufferPtr buf, const xmlChar *str) {
    if (buf == NULL)
        return(-1);
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
    if (str == NULL) return -1;
    return xmlBufferAdd(buf, str, -1);
}

/**
 * xmlBufferCCat:
 * @buf:  the buffer to dump
 * @str:  the C char string
 *
 * Append a zero terminated C string to an XML buffer.
 *
 * Returns 0 successful, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlBufferCCat(xmlBufferPtr buf, const char *str) {
    return xmlBufferCat(buf, (const xmlChar *) str);
}

/**
 * xmlBufferWriteCHAR:
 * @buf:  the XML buffer
 * @string:  the string to add
 *
 * routine which manages and grows an output buffer. This one adds
 * xmlChars at the end of the buffer.
 */
void
xmlBufferWriteCHAR(xmlBufferPtr buf, const xmlChar *string) {
    if (buf == NULL)
        return;
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return;
    xmlBufferCat(buf, string);
}

/**
 * xmlBufferWriteChar:
 * @buf:  the XML buffer output
 * @string:  the string to add
 *
 * routine which manage and grows an output buffer. This one add
 * C chars at the end of the array.
 */
void
xmlBufferWriteChar(xmlBufferPtr buf, const char *string) {
    if (buf == NULL)
        return;
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return;
    xmlBufferCCat(buf, string);
}


/**
 * xmlBufferWriteQuotedString:
 * @buf:  the XML buffer output
 * @string:  the string to add
 *
 * routine which manage and grows an output buffer. This one writes
 * a quoted or double quoted #xmlChar string, checking first if it holds
 * quote or double-quotes internally
 */
void
xmlBufferWriteQuotedString(xmlBufferPtr buf, const xmlChar *string) {
    const xmlChar *cur, *base;
    if (buf == NULL)
        return;
    if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return;
    if (xmlStrchr(string, '\"')) {
        if (xmlStrchr(string, '\'')) {
#ifdef DEBUG_BUFFER
      xmlGenericError(xmlGenericErrorContext,
 "xmlBufferWriteQuotedString: string contains quote and double-quotes !\n");
#endif
      xmlBufferCCat(buf, "\"");
            base = cur = string;
            while(*cur != 0){
                if(*cur == '"'){
                    if (base != cur)
                        xmlBufferAdd(buf, base, cur - base);
                    xmlBufferAdd(buf, BAD_CAST "&quot;", 6);
                    cur++;
                    base = cur;
                }
                else {
                    cur++;
                }
            }
            if (base != cur)
                xmlBufferAdd(buf, base, cur - base);
      xmlBufferCCat(buf, "\"");
  }
        else{
      xmlBufferCCat(buf, "\'");
            xmlBufferCat(buf, string);
      xmlBufferCCat(buf, "\'");
        }
    } else {
        xmlBufferCCat(buf, "\"");
        xmlBufferCat(buf, string);
        xmlBufferCCat(buf, "\"");
    }
}


/**
 * xmlGetDocCompressMode:
 * @doc:  the document
 *
 * get the compression ratio for a document, ZLIB based
 * Returns 0 (uncompressed) to 9 (max compression)
 */
int
xmlGetDocCompressMode (const xmlDoc *doc) {
    if (doc == NULL) return(-1);
    return(doc->compression);
}

/**
 * xmlSetDocCompressMode:
 * @doc:  the document
 * @mode:  the compression ratio
 *
 * set the compression ratio for a document, ZLIB based
 * Correct values: 0 (uncompressed) to 9 (max compression)
 */
void
xmlSetDocCompressMode (xmlDocPtr doc, int mode) {
    if (doc == NULL) return;
    if (mode < 0) doc->compression = 0;
    else if (mode > 9) doc->compression = 9;
    else doc->compression = mode;
}

/**
 * xmlGetCompressMode:
 *
 * get the default compression mode used, ZLIB based.
 * Returns 0 (uncompressed) to 9 (max compression)
 */
int
xmlGetCompressMode(void)
{
    return (xmlCompressMode);
}

/**
 * xmlSetCompressMode:
 * @mode:  the compression ratio
 *
 * set the default compression mode used, ZLIB based
 * Correct values: 0 (uncompressed) to 9 (max compression)
 */
void
xmlSetCompressMode(int mode) {
    if (mode < 0) xmlCompressMode = 0;
    else if (mode > 9) xmlCompressMode = 9;
    else xmlCompressMode = mode;
}

#define XML_TREE_NSMAP_PARENT -1
#define XML_TREE_NSMAP_XML -2
#define XML_TREE_NSMAP_DOC -3
#define XML_TREE_NSMAP_CUSTOM -4

typedef struct xmlNsMapItem *xmlNsMapItemPtr;
struct xmlNsMapItem {
    xmlNsMapItemPtr next;
    xmlNsMapItemPtr prev;
    xmlNsPtr oldNs; /* old ns decl reference */
    xmlNsPtr newNs; /* new ns decl reference */
    int shadowDepth; /* Shadowed at this depth */
    /*
    * depth:
    * >= 0 == @node's ns-decls
    * -1   == @parent's ns-decls
    * -2   == the doc->oldNs XML ns-decl
    * -3   == the doc->oldNs storage ns-decls
    * -4   == ns-decls provided via custom ns-handling
    */
    int depth;
};

typedef struct xmlNsMap *xmlNsMapPtr;
struct xmlNsMap {
    xmlNsMapItemPtr first;
    xmlNsMapItemPtr last;
    xmlNsMapItemPtr pool;
};

#define XML_NSMAP_NOTEMPTY(m) (((m) != NULL) && ((m)->first != NULL))
#define XML_NSMAP_FOREACH(m, i) for (i = (m)->first; i != NULL; i = (i)->next)
#define XML_NSMAP_POP(m, i) \
    i = (m)->last; \
    (m)->last = (i)->prev; \
    if ((m)->last == NULL) \
  (m)->first = NULL; \
    else \
  (m)->last->next = NULL; \
    (i)->next = (m)->pool; \
    (m)->pool = i;

/*
* xmlDOMWrapNsMapFree:
* @map: the ns-map
*
* Frees the ns-map
*/
static void
xmlDOMWrapNsMapFree(xmlNsMapPtr nsmap)
{
    xmlNsMapItemPtr cur, tmp;

    if (nsmap == NULL)
  return;
    cur = nsmap->pool;
    while (cur != NULL) {
  tmp = cur;
  cur = cur->next;
  xmlFree(tmp);
    }
    cur = nsmap->first;
    while (cur != NULL) {
  tmp = cur;
  cur = cur->next;
  xmlFree(tmp);
    }
    xmlFree(nsmap);
}

/*
* xmlDOMWrapNsMapAddItem:
* @map: the ns-map
* @oldNs: the old ns-struct
* @newNs: the new ns-struct
* @depth: depth and ns-kind information
*
* Adds an ns-mapping item.
*/
static xmlNsMapItemPtr
xmlDOMWrapNsMapAddItem(xmlNsMapPtr *nsmap, int position,
           xmlNsPtr oldNs, xmlNsPtr newNs, int depth)
{
    xmlNsMapItemPtr ret;
    xmlNsMapPtr map;

    if (nsmap == NULL)
  return(NULL);
    if ((position != -1) && (position != 0))
  return(NULL);
    map = *nsmap;

    if (map == NULL) {
  /*
  * Create the ns-map.
  */
  map = (xmlNsMapPtr) xmlMalloc(sizeof(struct xmlNsMap));
  if (map == NULL) {
      xmlTreeErrMemory("allocating namespace map");
      return (NULL);
  }
  memset(map, 0, sizeof(struct xmlNsMap));
  *nsmap = map;
    }

    if (map->pool != NULL) {
  /*
  * Reuse an item from the pool.
  */
  ret = map->pool;
  map->pool = ret->next;
  memset(ret, 0, sizeof(struct xmlNsMapItem));
    } else {
  /*
  * Create a new item.
  */
  ret = (xmlNsMapItemPtr) xmlMalloc(sizeof(struct xmlNsMapItem));
  if (ret == NULL) {
      xmlTreeErrMemory("allocating namespace map item");
      return (NULL);
  }
  memset(ret, 0, sizeof(struct xmlNsMapItem));
    }

    if (map->first == NULL) {
  /*
  * First ever.
  */
  map->first = ret;
  map->last = ret;
    } else if (position == -1) {
  /*
  * Append.
  */
  ret->prev = map->last;
  map->last->next = ret;
  map->last = ret;
    } else if (position == 0) {
  /*
  * Set on first position.
  */
  map->first->prev = ret;
  ret->next = map->first;
  map->first = ret;
    }

    ret->oldNs = oldNs;
    ret->newNs = newNs;
    ret->shadowDepth = -1;
    ret->depth = depth;
    return (ret);
}

/*
* xmlDOMWrapStoreNs:
* @doc: the doc
* @nsName: the namespace name
* @prefix: the prefix
*
* Creates or reuses an xmlNs struct on doc->oldNs with
* the given prefix and namespace name.
*
* Returns the acquired ns struct or NULL in case of an API
*         or internal error.
*/
static xmlNsPtr
xmlDOMWrapStoreNs(xmlDocPtr doc,
       const xmlChar *nsName,
       const xmlChar *prefix)
{
    xmlNsPtr ns;

    if (doc == NULL)
  return (NULL);
    ns = xmlTreeEnsureXMLDecl(doc);
    if (ns == NULL)
  return (NULL);
    if (ns->next != NULL) {
  /* Reuse. */
  ns = ns->next;
  while (ns != NULL) {
      if (((ns->prefix == prefix) ||
    xmlStrEqual(ns->prefix, prefix)) &&
    xmlStrEqual(ns->href, nsName)) {
    return (ns);
      }
      if (ns->next == NULL)
    break;
      ns = ns->next;
  }
    }
    /* Create. */
    if (ns != NULL) {
        ns->next = xmlNewNs(NULL, nsName, prefix);
        return (ns->next);
    }
    return(NULL);
}

/*
* xmlDOMWrapNewCtxt:
*
* Allocates and initializes a new DOM-wrapper context.
*
* Returns the xmlDOMWrapCtxtPtr or NULL in case of an internal error.
*/
xmlDOMWrapCtxtPtr
xmlDOMWrapNewCtxt(void)
{
    xmlDOMWrapCtxtPtr ret;

    ret = xmlMalloc(sizeof(xmlDOMWrapCtxt));
    if (ret == NULL) {
  xmlTreeErrMemory("allocating DOM-wrapper context");
  return (NULL);
    }
    memset(ret, 0, sizeof(xmlDOMWrapCtxt));
    return (ret);
}

/*
* xmlDOMWrapFreeCtxt:
* @ctxt: the DOM-wrapper context
*
* Frees the DOM-wrapper context.
*/
void
xmlDOMWrapFreeCtxt(xmlDOMWrapCtxtPtr ctxt)
{
    if (ctxt == NULL)
  return;
    if (ctxt->namespaceMap != NULL)
  xmlDOMWrapNsMapFree((xmlNsMapPtr) ctxt->namespaceMap);
    /*
    * TODO: Store the namespace map in the context.
    */
    xmlFree(ctxt);
}

/*
* xmlTreeLookupNsListByPrefix:
* @nsList: a list of ns-structs
* @prefix: the searched prefix
*
* Searches for a ns-decl with the given prefix in @nsList.
*
* Returns the ns-decl if found, NULL if not found and on
*         API errors.
*/
static xmlNsPtr
xmlTreeNSListLookupByPrefix(xmlNsPtr nsList, const xmlChar *prefix)
{
    if (nsList == NULL)
  return (NULL);
    {
  xmlNsPtr ns;
  ns = nsList;
  do {
      if ((prefix == ns->prefix) ||
    xmlStrEqual(prefix, ns->prefix)) {
    return (ns);
      }
      ns = ns->next;
  } while (ns != NULL);
    }
    return (NULL);
}

/*
*
* xmlDOMWrapNSNormGatherInScopeNs:
* @map: the namespace map
* @node: the node to start with
*
* Puts in-scope namespaces into the ns-map.
*
* Returns 0 on success, -1 on API or internal errors.
*/
static int
xmlDOMWrapNSNormGatherInScopeNs(xmlNsMapPtr *map,
        xmlNodePtr node)
{
    xmlNodePtr cur;
    xmlNsPtr ns;
    xmlNsMapItemPtr mi;
    int shadowed;

    if ((map == NULL) || (*map != NULL))
  return (-1);
    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL))
        return (-1);
    /*
    * Get in-scope ns-decls of @parent.
    */
    cur = node;
    while ((cur != NULL) && (cur != (xmlNodePtr) cur->doc)) {
  if (cur->type == XML_ELEMENT_NODE) {
      if (cur->nsDef != NULL) {
    ns = cur->nsDef;
    do {
        shadowed = 0;
        if (XML_NSMAP_NOTEMPTY(*map)) {
      /*
      * Skip shadowed prefixes.
      */
      XML_NSMAP_FOREACH(*map, mi) {
          if ((ns->prefix == mi->newNs->prefix) ||
        xmlStrEqual(ns->prefix, mi->newNs->prefix)) {
        shadowed = 1;
        break;
          }
      }
        }
        /*
        * Insert mapping.
        */
        mi = xmlDOMWrapNsMapAddItem(map, 0, NULL,
      ns, XML_TREE_NSMAP_PARENT);
        if (mi == NULL)
      return (-1);
        if (shadowed)
      mi->shadowDepth = 0;
        ns = ns->next;
    } while (ns != NULL);
      }
  }
  cur = cur->parent;
    }
    return (0);
}

/*
* XML_TREE_ADOPT_STR: If we have a dest-dict, put @str in the dict;
* otherwise copy it, when it was in the source-dict.
*/
#define XML_TREE_ADOPT_STR(str) \
    if (adoptStr && (str != NULL)) { \
  if (destDoc->dict) { \
      const xmlChar *old = str; \
      str = xmlDictLookup(destDoc->dict, str, -1); \
      if ((sourceDoc == NULL) || (sourceDoc->dict == NULL) || \
          (!xmlDictOwns(sourceDoc->dict, old))) \
    xmlFree((char *)old); \
  } else if ((sourceDoc) && (sourceDoc->dict) && \
      xmlDictOwns(sourceDoc->dict, str)) { \
      str = BAD_CAST xmlStrdup(str); \
  } \
    }

/*
* XML_TREE_ADOPT_STR_2: If @str was in the source-dict, then
* put it in dest-dict or copy it.
*/
#define XML_TREE_ADOPT_STR_2(str) \
    if (adoptStr && (str != NULL) && (sourceDoc != NULL) && \
  (sourceDoc->dict != NULL) && \
  xmlDictOwns(sourceDoc->dict, cur->content)) { \
  if (destDoc->dict) \
      cur->content = (xmlChar *) \
    xmlDictLookup(destDoc->dict, cur->content, -1); \
  else \
      cur->content = xmlStrdup(BAD_CAST cur->content); \
    }

/*
* xmlDOMWrapNSNormAddNsMapItem2:
*
* For internal use. Adds a ns-decl mapping.
*
* Returns 0 on success, -1 on internal errors.
*/
static int
xmlDOMWrapNSNormAddNsMapItem2(xmlNsPtr **list, int *size, int *number,
      xmlNsPtr oldNs, xmlNsPtr newNs)
{
    if (*list == NULL) {
  *list = (xmlNsPtr *) xmlMalloc(6 * sizeof(xmlNsPtr));
  if (*list == NULL) {
      xmlTreeErrMemory("alloc ns map item");
      return(-1);
  }
  *size = 3;
  *number = 0;
    } else if ((*number) >= (*size)) {
  *size *= 2;
  *list = (xmlNsPtr *) xmlRealloc(*list,
      (*size) * 2 * sizeof(xmlNsPtr));
  if (*list == NULL) {
      xmlTreeErrMemory("realloc ns map item");
      return(-1);
  }
    }
    (*list)[2 * (*number)] = oldNs;
    (*list)[2 * (*number) +1] = newNs;
    (*number)++;
    return (0);
}

/*
* xmlDOMWrapRemoveNode:
* @ctxt: a DOM wrapper context
* @doc: the doc
* @node: the node to be removed.
* @options: set of options, unused at the moment
*
* Unlinks the given node from its owner.
* This will substitute ns-references to node->nsDef for
* ns-references to doc->oldNs, thus ensuring the removed
* branch to be autark wrt ns-references.
*
* NOTE: This function was not intensively tested.
*
* Returns 0 on success, 1 if the node is not supported,
*         -1 on API and internal errors.
*/
int
xmlDOMWrapRemoveNode(xmlDOMWrapCtxtPtr ctxt, xmlDocPtr doc,
         xmlNodePtr node, int options ATTRIBUTE_UNUSED)
{
    xmlNsPtr *list = NULL;
    int sizeList, nbList, i, j;
    xmlNsPtr ns;

    if ((node == NULL) || (doc == NULL) || (node->doc != doc))
  return (-1);

    /* TODO: 0 or -1 ? */
    if (node->parent == NULL)
  return (0);

    switch (node->type) {
  case XML_TEXT_NODE:
  case XML_CDATA_SECTION_NODE:
  case XML_ENTITY_REF_NODE:
  case XML_PI_NODE:
  case XML_COMMENT_NODE:
      xmlUnlinkNode(node);
      return (0);
  case XML_ELEMENT_NODE:
  case XML_ATTRIBUTE_NODE:
      break;
  default:
      return (1);
    }
    xmlUnlinkNode(node);
    /*
    * Save out-of-scope ns-references in doc->oldNs.
    */
    do {
  switch (node->type) {
      case XML_ELEMENT_NODE:
    if ((ctxt == NULL) && (node->nsDef != NULL)) {
        ns = node->nsDef;
        do {
      if (xmlDOMWrapNSNormAddNsMapItem2(&list, &sizeList,
          &nbList, ns, ns) == -1)
          goto internal_error;
      ns = ns->next;
        } while (ns != NULL);
    }
                /* Falls through. */
      case XML_ATTRIBUTE_NODE:
    if (node->ns != NULL) {
        /*
        * Find a mapping.
        */
        if (list != NULL) {
      for (i = 0, j = 0; i < nbList; i++, j += 2) {
          if (node->ns == list[j]) {
        node->ns = list[++j];
        goto next_node;
          }
      }
        }
        ns = NULL;
        if (ctxt != NULL) {
      /*
      * User defined.
      */
        } else {
      /*
      * Add to doc's oldNs.
      */
      ns = xmlDOMWrapStoreNs(doc, node->ns->href,
          node->ns->prefix);
      if (ns == NULL)
          goto internal_error;
        }
        if (ns != NULL) {
      /*
      * Add mapping.
      */
      if (xmlDOMWrapNSNormAddNsMapItem2(&list, &sizeList,
          &nbList, node->ns, ns) == -1)
          goto internal_error;
        }
        node->ns = ns;
    }
    if ((node->type == XML_ELEMENT_NODE) &&
        (node->properties != NULL)) {
        node = (xmlNodePtr) node->properties;
        continue;
    }
    break;
      default:
    goto next_sibling;
  }
next_node:
  if ((node->type == XML_ELEMENT_NODE) &&
      (node->children != NULL)) {
      node = node->children;
      continue;
  }
next_sibling:
  if (node == NULL)
      break;
  if (node->next != NULL)
      node = node->next;
  else {
      node = node->parent;
      goto next_sibling;
  }
    } while (node != NULL);

    if (list != NULL)
  xmlFree(list);
    return (0);

internal_error:
    if (list != NULL)
  xmlFree(list);
    return (-1);
}

/*
* xmlSearchNsByNamespaceStrict:
* @doc: the document
* @node: the start node
* @nsName: the searched namespace name
* @retNs: the resulting ns-decl
* @prefixed: if the found ns-decl must have a prefix (for attributes)
*
* Dynamically searches for a ns-declaration which matches
* the given @nsName in the ancestor-or-self axis of @node.
*
* Returns 1 if a ns-decl was found, 0 if not and -1 on API
*         and internal errors.
*/
static int
xmlSearchNsByNamespaceStrict(xmlDocPtr doc, xmlNodePtr node,
           const xmlChar* nsName,
           xmlNsPtr *retNs, int prefixed)
{
    xmlNodePtr cur, prev = NULL, out = NULL;
    xmlNsPtr ns, prevns;

    if ((doc == NULL) || (nsName == NULL) || (retNs == NULL))
  return (-1);
    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL))
        return(-1);

    *retNs = NULL;
    if (xmlStrEqual(nsName, XML_XML_NAMESPACE)) {
  *retNs = xmlTreeEnsureXMLDecl(doc);
  if (*retNs == NULL)
      return (-1);
  return (1);
    }
    cur = node;
    do {
  if (cur->type == XML_ELEMENT_NODE) {
      if (cur->nsDef != NULL) {
    for (ns = cur->nsDef; ns != NULL; ns = ns->next) {
        if (prefixed && (ns->prefix == NULL))
      continue;
        if (prev != NULL) {
      /*
      * Check the last level of ns-decls for a
      * shadowing prefix.
      */
      prevns = prev->nsDef;
      do {
          if ((prevns->prefix == ns->prefix) ||
        ((prevns->prefix != NULL) &&
        (ns->prefix != NULL) &&
        xmlStrEqual(prevns->prefix, ns->prefix))) {
        /*
        * Shadowed.
        */
        break;
          }
          prevns = prevns->next;
      } while (prevns != NULL);
      if (prevns != NULL)
          continue;
        }
        /*
        * Ns-name comparison.
        */
        if ((nsName == ns->href) ||
      xmlStrEqual(nsName, ns->href)) {
      /*
      * At this point the prefix can only be shadowed,
      * if we are the the (at least) 3rd level of
      * ns-decls.
      */
      if (out) {
          int ret;

          ret = xmlNsInScope(doc, node, prev, ns->prefix);
          if (ret < 0)
        return (-1);
          /*
          * TODO: Should we try to find a matching ns-name
          * only once? This here keeps on searching.
          * I think we should try further since, there might
          * be an other matching ns-decl with an unshadowed
          * prefix.
          */
          if (! ret)
        continue;
      }
      *retNs = ns;
      return (1);
        }
    }
    out = prev;
    prev = cur;
      }
  } else if ((cur->type == XML_ENTITY_NODE) ||
            (cur->type == XML_ENTITY_DECL))
      return (0);
  cur = cur->parent;
    } while ((cur != NULL) && (cur->doc != (xmlDocPtr) cur));
    return (0);
}

/*
* xmlSearchNsByPrefixStrict:
* @doc: the document
* @node: the start node
* @prefix: the searched namespace prefix
* @retNs: the resulting ns-decl
*
* Dynamically searches for a ns-declaration which matches
* the given @nsName in the ancestor-or-self axis of @node.
*
* Returns 1 if a ns-decl was found, 0 if not and -1 on API
*         and internal errors.
*/
static int
xmlSearchNsByPrefixStrict(xmlDocPtr doc, xmlNodePtr node,
        const xmlChar* prefix,
        xmlNsPtr *retNs)
{
    xmlNodePtr cur;
    xmlNsPtr ns;

    if ((doc == NULL) || (node == NULL) || (node->type == XML_NAMESPACE_DECL))
        return(-1);

    if (retNs)
  *retNs = NULL;
    if (IS_STR_XML(prefix)) {
  if (retNs) {
      *retNs = xmlTreeEnsureXMLDecl(doc);
      if (*retNs == NULL)
    return (-1);
  }
  return (1);
    }
    cur = node;
    do {
  if (cur->type == XML_ELEMENT_NODE) {
      if (cur->nsDef != NULL) {
    ns = cur->nsDef;
    do {
        if ((prefix == ns->prefix) ||
      xmlStrEqual(prefix, ns->prefix))
        {
      /*
      * Disabled namespaces, e.g. xmlns:abc="".
      */
      if (ns->href == NULL)
          return(0);
      if (retNs)
          *retNs = ns;
      return (1);
        }
        ns = ns->next;
    } while (ns != NULL);
      }
  } else if ((cur->type == XML_ENTITY_NODE) ||
            (cur->type == XML_ENTITY_DECL))
      return (0);
  cur = cur->parent;
    } while ((cur != NULL) && (cur->doc != (xmlDocPtr) cur));
    return (0);
}

/*
* xmlDOMWrapNSNormDeclareNsForced:
* @doc: the doc
* @elem: the element-node to declare on
* @nsName: the namespace-name of the ns-decl
* @prefix: the preferred prefix of the ns-decl
* @checkShadow: ensure that the new ns-decl doesn't shadow ancestor ns-decls
*
* Declares a new namespace on @elem. It tries to use the
* given @prefix; if a ns-decl with the given prefix is already existent
* on @elem, it will generate an other prefix.
*
* Returns 1 if a ns-decl was found, 0 if not and -1 on API
*         and internal errors.
*/
static xmlNsPtr
xmlDOMWrapNSNormDeclareNsForced(xmlDocPtr doc,
        xmlNodePtr elem,
        const xmlChar *nsName,
        const xmlChar *prefix,
        int checkShadow)
{

    xmlNsPtr ret;
    char buf[50];
    const xmlChar *pref;
    int counter = 0;

    if ((doc == NULL) || (elem == NULL) || (elem->type != XML_ELEMENT_NODE))
        return(NULL);
    /*
    * Create a ns-decl on @anchor.
    */
    pref = prefix;
    while (1) {
  /*
  * Lookup whether the prefix is unused in elem's ns-decls.
  */
  if ((elem->nsDef != NULL) &&
      (xmlTreeNSListLookupByPrefix(elem->nsDef, pref) != NULL))
      goto ns_next_prefix;
  if (checkShadow && elem->parent &&
      ((xmlNodePtr) elem->parent->doc != elem->parent)) {
      /*
      * Does it shadow ancestor ns-decls?
      */
      if (xmlSearchNsByPrefixStrict(doc, elem->parent, pref, NULL) == 1)
    goto ns_next_prefix;
  }
  ret = xmlNewNs(NULL, nsName, pref);
  if (ret == NULL)
      return (NULL);
  if (elem->nsDef == NULL)
      elem->nsDef = ret;
  else {
      xmlNsPtr ns2 = elem->nsDef;
      while (ns2->next != NULL)
    ns2 = ns2->next;
      ns2->next = ret;
  }
  return (ret);
ns_next_prefix:
  counter++;
  if (counter > 1000)
      return (NULL);
  if (prefix == NULL) {
      snprintf((char *) buf, sizeof(buf),
    "ns_%d", counter);
  } else
      snprintf((char *) buf, sizeof(buf),
      "%.30s_%d", (char *)prefix, counter);
  pref = BAD_CAST buf;
    }
}

/*
* xmlDOMWrapNSNormAcquireNormalizedNs:
* @doc: the doc
* @elem: the element-node to declare namespaces on
* @ns: the ns-struct to use for the search
* @retNs: the found/created ns-struct
* @nsMap: the ns-map
* @depth: the current tree depth
* @ancestorsOnly: search in ancestor ns-decls only
* @prefixed: if the searched ns-decl must have a prefix (for attributes)
*
* Searches for a matching ns-name in the ns-decls of @nsMap, if not
* found it will either declare it on @elem, or store it in doc->oldNs.
* If a new ns-decl needs to be declared on @elem, it tries to use the
* @ns->prefix for it, if this prefix is already in use on @elem, it will
* change the prefix or the new ns-decl.
*
* Returns 0 if succeeded, -1 otherwise and on API/internal errors.
*/
static int
xmlDOMWrapNSNormAcquireNormalizedNs(xmlDocPtr doc,
           xmlNodePtr elem,
           xmlNsPtr ns,
           xmlNsPtr *retNs,
           xmlNsMapPtr *nsMap,

           int depth,
           int ancestorsOnly,
           int prefixed)
{
    xmlNsMapItemPtr mi;

    if ((doc == NULL) || (ns == NULL) || (retNs == NULL) ||
  (nsMap == NULL))
  return (-1);

    *retNs = NULL;
    /*
    * Handle XML namespace.
    */
    if (IS_STR_XML(ns->prefix)) {
  /*
  * Insert XML namespace mapping.
  */
  *retNs = xmlTreeEnsureXMLDecl(doc);
  if (*retNs == NULL)
      return (-1);
  return (0);
    }
    /*
    * If the search should be done in ancestors only and no
    * @elem (the first ancestor) was specified, then skip the search.
    */
    if ((XML_NSMAP_NOTEMPTY(*nsMap)) &&
  (! (ancestorsOnly && (elem == NULL))))
    {
  /*
  * Try to find an equal ns-name in in-scope ns-decls.
  */
  XML_NSMAP_FOREACH(*nsMap, mi) {
      if ((mi->depth >= XML_TREE_NSMAP_PARENT) &&
    /*
    * ancestorsOnly: This should be turned on to gain speed,
    * if one knows that the branch itself was already
    * ns-wellformed and no stale references existed.
    * I.e. it searches in the ancestor axis only.
    */
    ((! ancestorsOnly) || (mi->depth == XML_TREE_NSMAP_PARENT)) &&
    /* Skip shadowed prefixes. */
    (mi->shadowDepth == -1) &&
    /* Skip xmlns="" or xmlns:foo="". */
    ((mi->newNs->href != NULL) &&
    (mi->newNs->href[0] != 0)) &&
    /* Ensure a prefix if wanted. */
    ((! prefixed) || (mi->newNs->prefix != NULL)) &&
    /* Equal ns name */
    ((mi->newNs->href == ns->href) ||
    xmlStrEqual(mi->newNs->href, ns->href))) {
    /* Set the mapping. */
    mi->oldNs = ns;
    *retNs = mi->newNs;
    return (0);
      }
  }
    }
    /*
    * No luck, the namespace is out of scope or shadowed.
    */
    if (elem == NULL) {
  xmlNsPtr tmpns;

  /*
  * Store ns-decls in "oldNs" of the document-node.
  */
  tmpns = xmlDOMWrapStoreNs(doc, ns->href, ns->prefix);
  if (tmpns == NULL)
      return (-1);
  /*
  * Insert mapping.
  */
  if (xmlDOMWrapNsMapAddItem(nsMap, -1, ns,
    tmpns, XML_TREE_NSMAP_DOC) == NULL) {
      xmlFreeNs(tmpns);
      return (-1);
  }
  *retNs = tmpns;
    } else {
  xmlNsPtr tmpns;

  tmpns = xmlDOMWrapNSNormDeclareNsForced(doc, elem, ns->href,
      ns->prefix, 0);
  if (tmpns == NULL)
      return (-1);

  if (*nsMap != NULL) {
      /*
      * Does it shadow ancestor ns-decls?
      */
      XML_NSMAP_FOREACH(*nsMap, mi) {
    if ((mi->depth < depth) &&
        (mi->shadowDepth == -1) &&
        ((ns->prefix == mi->newNs->prefix) ||
        xmlStrEqual(ns->prefix, mi->newNs->prefix))) {
        /*
        * Shadows.
        */
        mi->shadowDepth = depth;
        break;
    }
      }
  }
  if (xmlDOMWrapNsMapAddItem(nsMap, -1, ns, tmpns, depth) == NULL) {
      xmlFreeNs(tmpns);
      return (-1);
  }
  *retNs = tmpns;
    }
    return (0);
}

typedef enum {
    XML_DOM_RECONNS_REMOVEREDUND = 1<<0
} xmlDOMReconcileNSOptions;

/*
* xmlDOMWrapReconcileNamespaces:
* @ctxt: DOM wrapper context, unused at the moment
* @elem: the element-node
* @options: option flags
*
* Ensures that ns-references point to ns-decls hold on element-nodes.
* Ensures that the tree is namespace wellformed by creating additional
* ns-decls where needed. Note that, since prefixes of already existent
* ns-decls can be shadowed by this process, it could break QNames in
* attribute values or element content.
*
* NOTE: This function was not intensively tested.
*
* Returns 0 if succeeded, -1 otherwise and on API/internal errors.
*/

int
xmlDOMWrapReconcileNamespaces(xmlDOMWrapCtxtPtr ctxt ATTRIBUTE_UNUSED,
            xmlNodePtr elem,
            int options)
{
    int depth = -1, adoptns = 0, parnsdone = 0;
    xmlNsPtr ns, prevns;
    xmlDocPtr doc;
    xmlNodePtr cur, curElem = NULL;
    xmlNsMapPtr nsMap = NULL;
    xmlNsMapItemPtr /* topmi = NULL, */ mi;
    /* @ancestorsOnly should be set by an option flag. */
    int ancestorsOnly = 0;
    int optRemoveRedundantNS =
  ((xmlDOMReconcileNSOptions) options & XML_DOM_RECONNS_REMOVEREDUND) ? 1 : 0;
    xmlNsPtr *listRedund = NULL;
    int sizeRedund = 0, nbRedund = 0, ret, i, j;

    if ((elem == NULL) || (elem->doc == NULL) ||
  (elem->type != XML_ELEMENT_NODE))
  return (-1);

    doc = elem->doc;
    cur = elem;
    do {
  switch (cur->type) {
      case XML_ELEMENT_NODE:
    adoptns = 1;
    curElem = cur;
    depth++;
    /*
    * Namespace declarations.
    */
    if (cur->nsDef != NULL) {
        prevns = NULL;
        ns = cur->nsDef;
        while (ns != NULL) {
      if (! parnsdone) {
          if ((elem->parent) &&
        ((xmlNodePtr) elem->parent->doc != elem->parent)) {
        /*
        * Gather ancestor in-scope ns-decls.
        */
        if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap,
            elem->parent) == -1)
            goto internal_error;
          }
          parnsdone = 1;
      }

      /*
      * Lookup the ns ancestor-axis for equal ns-decls in scope.
      */
      if (optRemoveRedundantNS && XML_NSMAP_NOTEMPTY(nsMap)) {
          XML_NSMAP_FOREACH(nsMap, mi) {
        if ((mi->depth >= XML_TREE_NSMAP_PARENT) &&
            (mi->shadowDepth == -1) &&
            ((ns->prefix == mi->newNs->prefix) ||
              xmlStrEqual(ns->prefix, mi->newNs->prefix)) &&
            ((ns->href == mi->newNs->href) ||
              xmlStrEqual(ns->href, mi->newNs->href)))
        {
            /*
            * A redundant ns-decl was found.
            * Add it to the list of redundant ns-decls.
            */
            if (xmlDOMWrapNSNormAddNsMapItem2(&listRedund,
          &sizeRedund, &nbRedund, ns, mi->newNs) == -1)
          goto internal_error;
            /*
            * Remove the ns-decl from the element-node.
            */
            if (prevns)
          prevns->next = ns->next;
            else
          cur->nsDef = ns->next;
            goto next_ns_decl;
        }
          }
      }

      /*
      * Skip ns-references handling if the referenced
      * ns-decl is declared on the same element.
      */
      if ((cur->ns != NULL) && adoptns && (cur->ns == ns))
          adoptns = 0;
      /*
      * Does it shadow any ns-decl?
      */
      if (XML_NSMAP_NOTEMPTY(nsMap)) {
          XML_NSMAP_FOREACH(nsMap, mi) {
        if ((mi->depth >= XML_TREE_NSMAP_PARENT) &&
            (mi->shadowDepth == -1) &&
            ((ns->prefix == mi->newNs->prefix) ||
            xmlStrEqual(ns->prefix, mi->newNs->prefix))) {

            mi->shadowDepth = depth;
        }
          }
      }
      /*
      * Push mapping.
      */
      if (xmlDOMWrapNsMapAddItem(&nsMap, -1, ns, ns,
          depth) == NULL)
          goto internal_error;

      prevns = ns;
next_ns_decl:
      ns = ns->next;
        }
    }
    if (! adoptns)
        goto ns_end;
                /* Falls through. */
      case XML_ATTRIBUTE_NODE:
    /* No ns, no fun. */
    if (cur->ns == NULL)
        goto ns_end;

    if (! parnsdone) {
        if ((elem->parent) &&
      ((xmlNodePtr) elem->parent->doc != elem->parent)) {
      if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap,
        elem->parent) == -1)
          goto internal_error;
        }
        parnsdone = 1;
    }
    /*
    * Adjust the reference if this was a redundant ns-decl.
    */
    if (listRedund) {
       for (i = 0, j = 0; i < nbRedund; i++, j += 2) {
           if (cur->ns == listRedund[j]) {
         cur->ns = listRedund[++j];
         break;
           }
       }
    }
    /*
    * Adopt ns-references.
    */
    if (XML_NSMAP_NOTEMPTY(nsMap)) {
        /*
        * Search for a mapping.
        */
        XML_NSMAP_FOREACH(nsMap, mi) {
      if ((mi->shadowDepth == -1) &&
          (cur->ns == mi->oldNs)) {

          cur->ns = mi->newNs;
          goto ns_end;
      }
        }
    }
    /*
    * Acquire a normalized ns-decl and add it to the map.
    */
    if (xmlDOMWrapNSNormAcquireNormalizedNs(doc, curElem,
      cur->ns, &ns,
      &nsMap, depth,
      ancestorsOnly,
      (cur->type == XML_ATTRIBUTE_NODE) ? 1 : 0) == -1)
        goto internal_error;
    cur->ns = ns;

ns_end:
    if ((cur->type == XML_ELEMENT_NODE) &&
        (cur->properties != NULL)) {
        /*
        * Process attributes.
        */
        cur = (xmlNodePtr) cur->properties;
        continue;
    }
    break;
      default:
    goto next_sibling;
  }
into_content:
  if ((cur->type == XML_ELEMENT_NODE) &&
      (cur->children != NULL)) {
      /*
      * Process content of element-nodes only.
      */
      cur = cur->children;
      continue;
  }
next_sibling:
  if (cur == elem)
      break;
  if (cur->type == XML_ELEMENT_NODE) {
      if (XML_NSMAP_NOTEMPTY(nsMap)) {
    /*
    * Pop mappings.
    */
    while ((nsMap->last != NULL) &&
        (nsMap->last->depth >= depth))
    {
        XML_NSMAP_POP(nsMap, mi)
    }
    /*
    * Unshadow.
    */
    XML_NSMAP_FOREACH(nsMap, mi) {
        if (mi->shadowDepth >= depth)
      mi->shadowDepth = -1;
    }
      }
      depth--;
  }
  if (cur->next != NULL)
      cur = cur->next;
  else {
      if (cur->type == XML_ATTRIBUTE_NODE) {
    cur = cur->parent;
    goto into_content;
      }
      cur = cur->parent;
      goto next_sibling;
  }
    } while (cur != NULL);

    ret = 0;
    goto exit;
internal_error:
    ret = -1;
exit:
    if (listRedund) {
  for (i = 0, j = 0; i < nbRedund; i++, j += 2) {
      xmlFreeNs(listRedund[j]);
  }
  xmlFree(listRedund);
    }
    if (nsMap != NULL)
  xmlDOMWrapNsMapFree(nsMap);
    return (ret);
}

/*
* xmlDOMWrapAdoptBranch:
* @ctxt: the optional context for custom processing
* @sourceDoc: the optional sourceDoc
* @node: the element-node to start with
* @destDoc: the destination doc for adoption
* @destParent: the optional new parent of @node in @destDoc
* @options: option flags
*
* Ensures that ns-references point to @destDoc: either to
* elements->nsDef entries if @destParent is given, or to
* @destDoc->oldNs otherwise.
* If @destParent is given, it ensures that the tree is namespace
* wellformed by creating additional ns-decls where needed.
* Note that, since prefixes of already existent ns-decls can be
* shadowed by this process, it could break QNames in attribute
* values or element content.
*
* NOTE: This function was not intensively tested.
*
* Returns 0 if succeeded, -1 otherwise and on API/internal errors.
*/
static int
xmlDOMWrapAdoptBranch(xmlDOMWrapCtxtPtr ctxt,
          xmlDocPtr sourceDoc,
          xmlNodePtr node,
          xmlDocPtr destDoc,
          xmlNodePtr destParent,
          int options ATTRIBUTE_UNUSED)
{
    int ret = 0;
    xmlNodePtr cur, curElem = NULL;
    xmlNsMapPtr nsMap = NULL;
    xmlNsMapItemPtr mi;
    xmlNsPtr ns = NULL;
    int depth = -1, adoptStr = 1;
    /* gather @parent's ns-decls. */
    int parnsdone;
    /* @ancestorsOnly should be set per option. */
    int ancestorsOnly = 0;

    /*
    * Optimize string adoption for equal or none dicts.
    */
    if ((sourceDoc != NULL) &&
  (sourceDoc->dict == destDoc->dict))
  adoptStr = 0;
    else
  adoptStr = 1;

    /*
    * Get the ns-map from the context if available.
    */
    if (ctxt)
  nsMap = (xmlNsMapPtr) ctxt->namespaceMap;
    /*
    * Disable search for ns-decls in the parent-axis of the
    * destination element, if:
    * 1) there's no destination parent
    * 2) custom ns-reference handling is used
    */
    if ((destParent == NULL) ||
  (ctxt && ctxt->getNsForNodeFunc))
    {
  parnsdone = 1;
    } else
  parnsdone = 0;

    cur = node;
    if ((cur != NULL) && (cur->type == XML_NAMESPACE_DECL))
  goto internal_error;

    while (cur != NULL) {
  /*
  * Paranoid source-doc sanity check.
  */
  if (cur->doc != sourceDoc) {
      /*
      * We'll assume XIncluded nodes if the doc differs.
      * TODO: Do we need to reconciliate XIncluded nodes?
      * This here skips XIncluded nodes and tries to handle
      * broken sequences.
      */
      if (cur->next == NULL)
    goto leave_node;
      do {
    cur = cur->next;
    if ((cur->type == XML_XINCLUDE_END) ||
        (cur->doc == node->doc))
        break;
      } while (cur->next != NULL);

      if (cur->doc != node->doc)
    goto leave_node;
  }
  cur->doc = destDoc;
  switch (cur->type) {
      case XML_XINCLUDE_START:
      case XML_XINCLUDE_END:
    /*
    * TODO
    */
    return (-1);
      case XML_ELEMENT_NODE:
    curElem = cur;
    depth++;
    /*
    * Namespace declarations.
    * - ns->href and ns->prefix are never in the dict, so
    *   we need not move the values over to the destination dict.
    * - Note that for custom handling of ns-references,
    *   the ns-decls need not be stored in the ns-map,
    *   since they won't be referenced by node->ns.
    */
    if ((cur->nsDef) &&
        ((ctxt == NULL) || (ctxt->getNsForNodeFunc == NULL)))
    {
        if (! parnsdone) {
      /*
      * Gather @parent's in-scope ns-decls.
      */
      if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap,
          destParent) == -1)
          goto internal_error;
      parnsdone = 1;
        }
        for (ns = cur->nsDef; ns != NULL; ns = ns->next) {
      /*
      * NOTE: ns->prefix and ns->href are never in the dict.
      * XML_TREE_ADOPT_STR(ns->prefix)
      * XML_TREE_ADOPT_STR(ns->href)
      */
      /*
      * Does it shadow any ns-decl?
      */
      if (XML_NSMAP_NOTEMPTY(nsMap)) {
          XML_NSMAP_FOREACH(nsMap, mi) {
        if ((mi->depth >= XML_TREE_NSMAP_PARENT) &&
            (mi->shadowDepth == -1) &&
            ((ns->prefix == mi->newNs->prefix) ||
            xmlStrEqual(ns->prefix,
            mi->newNs->prefix))) {

            mi->shadowDepth = depth;
        }
          }
      }
      /*
      * Push mapping.
      */
      if (xmlDOMWrapNsMapAddItem(&nsMap, -1,
          ns, ns, depth) == NULL)
          goto internal_error;
        }
    }
                /* Falls through. */
      case XML_ATTRIBUTE_NODE:
    /* No namespace, no fun. */
    if (cur->ns == NULL)
        goto ns_end;

    if (! parnsdone) {
        if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap,
      destParent) == -1)
      goto internal_error;
        parnsdone = 1;
    }
    /*
    * Adopt ns-references.
    */
    if (XML_NSMAP_NOTEMPTY(nsMap)) {
        /*
        * Search for a mapping.
        */
        XML_NSMAP_FOREACH(nsMap, mi) {
      if ((mi->shadowDepth == -1) &&
          (cur->ns == mi->oldNs)) {

          cur->ns = mi->newNs;
          goto ns_end;
      }
        }
    }
    /*
    * No matching namespace in scope. We need a new one.
    */
    if ((ctxt) && (ctxt->getNsForNodeFunc)) {
        /*
        * User-defined behaviour.
        */
        ns = ctxt->getNsForNodeFunc(ctxt, cur,
      cur->ns->href, cur->ns->prefix);
        /*
        * Insert mapping if ns is available; it's the users fault
        * if not.
        */
        if (xmlDOMWrapNsMapAddItem(&nsMap, -1,
          cur->ns, ns, XML_TREE_NSMAP_CUSTOM) == NULL)
      goto internal_error;
        cur->ns = ns;
    } else {
        /*
        * Acquire a normalized ns-decl and add it to the map.
        */
        if (xmlDOMWrapNSNormAcquireNormalizedNs(destDoc,
      /* ns-decls on curElem or on destDoc->oldNs */
      destParent ? curElem : NULL,
      cur->ns, &ns,
      &nsMap, depth,
      ancestorsOnly,
      /* ns-decls must be prefixed for attributes. */
      (cur->type == XML_ATTRIBUTE_NODE) ? 1 : 0) == -1)
      goto internal_error;
        cur->ns = ns;
    }
ns_end:
    /*
    * Further node properties.
    * TODO: Is this all?
    */
    XML_TREE_ADOPT_STR(cur->name)
    if (cur->type == XML_ELEMENT_NODE) {
        cur->psvi = NULL;
        cur->line = 0;
        cur->extra = 0;
        /*
        * Walk attributes.
        */
        if (cur->properties != NULL) {
      /*
      * Process first attribute node.
      */
      cur = (xmlNodePtr) cur->properties;
      continue;
        }
    } else {
        /*
        * Attributes.
        */
        if ((sourceDoc != NULL) &&
      (((xmlAttrPtr) cur)->atype == XML_ATTRIBUTE_ID))
        {
      xmlRemoveID(sourceDoc, (xmlAttrPtr) cur);
        }
        ((xmlAttrPtr) cur)->atype = 0;
        ((xmlAttrPtr) cur)->psvi = NULL;
    }
    break;
      case XML_TEXT_NODE:
      case XML_CDATA_SECTION_NODE:
    /*
    * This puts the content in the dest dict, only if
    * it was previously in the source dict.
    */
    XML_TREE_ADOPT_STR_2(cur->content)
    goto leave_node;
      case XML_ENTITY_REF_NODE:
    /*
    * Remove reference to the entity-node.
    */
    cur->content = NULL;
    cur->children = NULL;
    cur->last = NULL;
    if ((destDoc->intSubset) || (destDoc->extSubset)) {
        xmlEntityPtr ent;
        /*
        * Assign new entity-node if available.
        */
        ent = xmlGetDocEntity(destDoc, cur->name);
        if (ent != NULL) {
      cur->content = ent->content;
      cur->children = (xmlNodePtr) ent;
      cur->last = (xmlNodePtr) ent;
        }
    }
    goto leave_node;
      case XML_PI_NODE:
    XML_TREE_ADOPT_STR(cur->name)
    XML_TREE_ADOPT_STR_2(cur->content)
    break;
      case XML_COMMENT_NODE:
    break;
      default:
    goto internal_error;
  }
  /*
  * Walk the tree.
  */
  if (cur->children != NULL) {
      cur = cur->children;
      continue;
  }

leave_node:
  if (cur == node)
      break;
  if ((cur->type == XML_ELEMENT_NODE) ||
      (cur->type == XML_XINCLUDE_START) ||
      (cur->type == XML_XINCLUDE_END))
  {
      /*
      * TODO: Do we expect nsDefs on XML_XINCLUDE_START?
      */
      if (XML_NSMAP_NOTEMPTY(nsMap)) {
    /*
    * Pop mappings.
    */
    while ((nsMap->last != NULL) &&
        (nsMap->last->depth >= depth))
    {
        XML_NSMAP_POP(nsMap, mi)
    }
    /*
    * Unshadow.
    */
    XML_NSMAP_FOREACH(nsMap, mi) {
        if (mi->shadowDepth >= depth)
      mi->shadowDepth = -1;
    }
      }
      depth--;
  }
  if (cur->next != NULL)
      cur = cur->next;
  else if ((cur->type == XML_ATTRIBUTE_NODE) &&
      (cur->parent->children != NULL))
  {
      cur = cur->parent->children;
  } else {
      cur = cur->parent;
      goto leave_node;
  }
    }

    goto exit;

internal_error:
    ret = -1;

exit:
    /*
    * Cleanup.
    */
    if (nsMap != NULL) {
  if ((ctxt) && (ctxt->namespaceMap == nsMap)) {
      /*
      * Just cleanup the map but don't free.
      */
      if (nsMap->first) {
    if (nsMap->pool)
        nsMap->last->next = nsMap->pool;
    nsMap->pool = nsMap->first;
    nsMap->first = NULL;
      }
  } else
      xmlDOMWrapNsMapFree(nsMap);
    }
    return(ret);
}

/*
* xmlDOMWrapCloneNode:
* @ctxt: the optional context for custom processing
* @sourceDoc: the optional sourceDoc
* @node: the node to start with
* @resNode: the clone of the given @node
* @destDoc: the destination doc
* @destParent: the optional new parent of @node in @destDoc
* @deep: descend into child if set
* @options: option flags
*
* References of out-of scope ns-decls are remapped to point to @destDoc:
* 1) If @destParent is given, then nsDef entries on element-nodes are used
* 2) If *no* @destParent is given, then @destDoc->oldNs entries are used.
*    This is the case when you don't know already where the cloned branch
*    will be added to.
*
* If @destParent is given, it ensures that the tree is namespace
* wellformed by creating additional ns-decls where needed.
* Note that, since prefixes of already existent ns-decls can be
* shadowed by this process, it could break QNames in attribute
* values or element content.
* TODO:
*   1) What to do with XInclude? Currently this returns an error for XInclude.
*
* Returns 0 if the operation succeeded,
*         1 if a node of unsupported (or not yet supported) type was given,
*         -1 on API/internal errors.
*/

int
xmlDOMWrapCloneNode(xmlDOMWrapCtxtPtr ctxt,
          xmlDocPtr sourceDoc,
          xmlNodePtr node,
          xmlNodePtr *resNode,
          xmlDocPtr destDoc,
          xmlNodePtr destParent,
          int deep,
          int options ATTRIBUTE_UNUSED)
{
    int ret = 0;
    xmlNodePtr cur, curElem = NULL;
    xmlNsMapPtr nsMap = NULL;
    xmlNsMapItemPtr mi;
    xmlNsPtr ns;
    int depth = -1;
    /* int adoptStr = 1; */
    /* gather @parent's ns-decls. */
    int parnsdone = 0;
    /*
    * @ancestorsOnly:
    * TODO: @ancestorsOnly should be set per option.
    *
    */
    int ancestorsOnly = 0;
    xmlNodePtr resultClone = NULL, clone = NULL, parentClone = NULL, prevClone = NULL;
    xmlNsPtr cloneNs = NULL, *cloneNsDefSlot = NULL;
    xmlDictPtr dict; /* The destination dict */

    if ((node == NULL) || (resNode == NULL) || (destDoc == NULL))
  return(-1);
    /*
    * TODO: Initially we support only element-nodes.
    */
    if (node->type != XML_ELEMENT_NODE)
  return(1);
    /*
    * Check node->doc sanity.
    */
    if ((node->doc != NULL) && (sourceDoc != NULL) &&
  (node->doc != sourceDoc)) {
  /*
  * Might be an XIncluded node.
  */
  return (-1);
    }
    if (sourceDoc == NULL)
  sourceDoc = node->doc;
    if (sourceDoc == NULL)
        return (-1);

    dict = destDoc->dict;
    /*
    * Reuse the namespace map of the context.
    */
    if (ctxt)
  nsMap = (xmlNsMapPtr) ctxt->namespaceMap;

    *resNode = NULL;

    cur = node;
    if ((cur != NULL) && (cur->type == XML_NAMESPACE_DECL))
        return(-1);

    while (cur != NULL) {
  if (cur->doc != sourceDoc) {
      /*
      * We'll assume XIncluded nodes if the doc differs.
      * TODO: Do we need to reconciliate XIncluded nodes?
      * TODO: This here returns -1 in this case.
      */
      goto internal_error;
  }
  /*
  * Create a new node.
  */
  switch (cur->type) {
      case XML_XINCLUDE_START:
      case XML_XINCLUDE_END:
    /*
    * TODO: What to do with XInclude?
    */
    goto internal_error;
    break;
      case XML_ELEMENT_NODE:
      case XML_TEXT_NODE:
      case XML_CDATA_SECTION_NODE:
      case XML_COMMENT_NODE:
      case XML_PI_NODE:
      case XML_DOCUMENT_FRAG_NODE:
      case XML_ENTITY_REF_NODE:
      case XML_ENTITY_NODE:
    /*
    * Nodes of xmlNode structure.
    */
    clone = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    if (clone == NULL) {
        xmlTreeErrMemory("xmlDOMWrapCloneNode(): allocating a node");
        goto internal_error;
    }
    memset(clone, 0, sizeof(xmlNode));
    /*
    * Set hierarchical links.
    */
    if (resultClone != NULL) {
        clone->parent = parentClone;
        if (prevClone) {
      prevClone->next = clone;
      clone->prev = prevClone;
        } else
      parentClone->children = clone;
    } else
        resultClone = clone;

    break;
      case XML_ATTRIBUTE_NODE:
    /*
    * Attributes (xmlAttr).
    */
                /* Use xmlRealloc to avoid -Warray-bounds warning */
    clone = (xmlNodePtr) xmlRealloc(NULL, sizeof(xmlAttr));
    if (clone == NULL) {
        xmlTreeErrMemory("xmlDOMWrapCloneNode(): allocating an attr-node");
        goto internal_error;
    }
    memset(clone, 0, sizeof(xmlAttr));
    /*
    * Set hierarchical links.
    * TODO: Change this to add to the end of attributes.
    */
    if (resultClone != NULL) {
        clone->parent = parentClone;
        if (prevClone) {
      prevClone->next = clone;
      clone->prev = prevClone;
        } else
      parentClone->properties = (xmlAttrPtr) clone;
    } else
        resultClone = clone;
    break;
      default:
    /*
    * TODO QUESTION: Any other nodes expected?
    */
    goto internal_error;
  }

  clone->type = cur->type;
  clone->doc = destDoc;

  /*
  * Clone the name of the node if any.
  */
  if (cur->name == xmlStringText)
      clone->name = xmlStringText;
  else if (cur->name == xmlStringTextNoenc)
      /*
      * NOTE: Although xmlStringTextNoenc is never assigned to a node
      *   in tree.c, it might be set in Libxslt via
      *   "xsl:disable-output-escaping".
      */
      clone->name = xmlStringTextNoenc;
  else if (cur->name == xmlStringComment)
      clone->name = xmlStringComment;
  else if (cur->name != NULL) {
      DICT_CONST_COPY(cur->name, clone->name);
  }

  switch (cur->type) {
      case XML_XINCLUDE_START:
      case XML_XINCLUDE_END:
    /*
    * TODO
    */
    return (-1);
      case XML_ELEMENT_NODE:
    curElem = cur;
    depth++;
    /*
    * Namespace declarations.
    */
    if (cur->nsDef != NULL) {
        if (! parnsdone) {
      if (destParent && (ctxt == NULL)) {
          /*
          * Gather @parent's in-scope ns-decls.
          */
          if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap,
        destParent) == -1)
        goto internal_error;
      }
      parnsdone = 1;
        }
        /*
        * Clone namespace declarations.
        */
        cloneNsDefSlot = &(clone->nsDef);
        for (ns = cur->nsDef; ns != NULL; ns = ns->next) {
      /*
      * Create a new xmlNs.
      */
      cloneNs = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
      if (cloneNs == NULL) {
          xmlTreeErrMemory("xmlDOMWrapCloneNode(): "
        "allocating namespace");
          return(-1);
      }
      memset(cloneNs, 0, sizeof(xmlNs));
      cloneNs->type = XML_LOCAL_NAMESPACE;

      if (ns->href != NULL)
          cloneNs->href = xmlStrdup(ns->href);
      if (ns->prefix != NULL)
          cloneNs->prefix = xmlStrdup(ns->prefix);

      *cloneNsDefSlot = cloneNs;
      cloneNsDefSlot = &(cloneNs->next);

      /*
      * Note that for custom handling of ns-references,
      * the ns-decls need not be stored in the ns-map,
      * since they won't be referenced by node->ns.
      */
      if ((ctxt == NULL) ||
          (ctxt->getNsForNodeFunc == NULL))
      {
          /*
          * Does it shadow any ns-decl?
          */
          if (XML_NSMAP_NOTEMPTY(nsMap)) {
        XML_NSMAP_FOREACH(nsMap, mi) {
            if ((mi->depth >= XML_TREE_NSMAP_PARENT) &&
          (mi->shadowDepth == -1) &&
          ((ns->prefix == mi->newNs->prefix) ||
          xmlStrEqual(ns->prefix,
          mi->newNs->prefix))) {
          /*
          * Mark as shadowed at the current
          * depth.
          */
          mi->shadowDepth = depth;
            }
        }
          }
          /*
          * Push mapping.
          */
          if (xmlDOMWrapNsMapAddItem(&nsMap, -1,
        ns, cloneNs, depth) == NULL)
        goto internal_error;
      }
        }
    }
    /* cur->ns will be processed further down. */
    break;
      case XML_ATTRIBUTE_NODE:
    /* IDs will be processed further down. */
    /* cur->ns will be processed further down. */
    break;
      case XML_TEXT_NODE:
      case XML_CDATA_SECTION_NODE:
    /*
    * Note that this will also cover the values of attributes.
    */
    DICT_COPY(cur->content, clone->content);
    goto leave_node;
      case XML_ENTITY_NODE:
    /* TODO: What to do here? */
    goto leave_node;
      case XML_ENTITY_REF_NODE:
    if (sourceDoc != destDoc) {
        if ((destDoc->intSubset) || (destDoc->extSubset)) {
      xmlEntityPtr ent;
      /*
      * Different doc: Assign new entity-node if available.
      */
      ent = xmlGetDocEntity(destDoc, cur->name);
      if (ent != NULL) {
          clone->content = ent->content;
          clone->children = (xmlNodePtr) ent;
          clone->last = (xmlNodePtr) ent;
      }
        }
    } else {
        /*
        * Same doc: Use the current node's entity declaration
        * and value.
        */
        clone->content = cur->content;
        clone->children = cur->children;
        clone->last = cur->last;
    }
    goto leave_node;
      case XML_PI_NODE:
    DICT_COPY(cur->content, clone->content);
    goto leave_node;
      case XML_COMMENT_NODE:
    DICT_COPY(cur->content, clone->content);
    goto leave_node;
      default:
    goto internal_error;
  }

  if (cur->ns == NULL)
      goto end_ns_reference;

/* handle_ns_reference: */
  /*
  ** The following will take care of references to ns-decls ********
  ** and is intended only for element- and attribute-nodes.
  **
  */
  if (! parnsdone) {
      if (destParent && (ctxt == NULL)) {
    if (xmlDOMWrapNSNormGatherInScopeNs(&nsMap, destParent) == -1)
        goto internal_error;
      }
      parnsdone = 1;
  }
  /*
  * Adopt ns-references.
  */
  if (XML_NSMAP_NOTEMPTY(nsMap)) {
      /*
      * Search for a mapping.
      */
      XML_NSMAP_FOREACH(nsMap, mi) {
    if ((mi->shadowDepth == -1) &&
        (cur->ns == mi->oldNs)) {
        /*
        * This is the nice case: a mapping was found.
        */
        clone->ns = mi->newNs;
        goto end_ns_reference;
    }
      }
  }
  /*
  * No matching namespace in scope. We need a new one.
  */
  if ((ctxt != NULL) && (ctxt->getNsForNodeFunc != NULL)) {
      /*
      * User-defined behaviour.
      */
      ns = ctxt->getNsForNodeFunc(ctxt, cur,
    cur->ns->href, cur->ns->prefix);
      /*
      * Add user's mapping.
      */
      if (xmlDOMWrapNsMapAddItem(&nsMap, -1,
    cur->ns, ns, XML_TREE_NSMAP_CUSTOM) == NULL)
    goto internal_error;
      clone->ns = ns;
  } else {
      /*
      * Acquire a normalized ns-decl and add it to the map.
      */
      if (xmlDOMWrapNSNormAcquireNormalizedNs(destDoc,
    /* ns-decls on curElem or on destDoc->oldNs */
    destParent ? curElem : NULL,
    cur->ns, &ns,
    &nsMap, depth,
    /* if we need to search only in the ancestor-axis */
    ancestorsOnly,
    /* ns-decls must be prefixed for attributes. */
    (cur->type == XML_ATTRIBUTE_NODE) ? 1 : 0) == -1)
    goto internal_error;
      clone->ns = ns;
  }

end_ns_reference:

  /*
  * Some post-processing.
  *
  * Handle ID attributes.
  */
  if ((clone->type == XML_ATTRIBUTE_NODE) &&
      (clone->parent != NULL))
  {
      if (xmlIsID(destDoc, clone->parent, (xmlAttrPtr) clone)) {

    xmlChar *idVal;

    idVal = xmlNodeListGetString(cur->doc, cur->children, 1);
    if (idVal != NULL) {
        if (xmlAddID(NULL, destDoc, idVal, (xmlAttrPtr) cur) == NULL) {
      /* TODO: error message. */
      xmlFree(idVal);
      goto internal_error;
        }
        xmlFree(idVal);
    }
      }
  }
  /*
  **
  ** The following will traverse the tree **************************
  **
  *
  * Walk the element's attributes before descending into child-nodes.
  */
  if ((cur->type == XML_ELEMENT_NODE) && (cur->properties != NULL)) {
      prevClone = NULL;
      parentClone = clone;
      cur = (xmlNodePtr) cur->properties;
      continue;
  }
into_content:
  /*
  * Descend into child-nodes.
  */
  if (cur->children != NULL) {
      if (deep || (cur->type == XML_ATTRIBUTE_NODE)) {
    prevClone = NULL;
    parentClone = clone;
    cur = cur->children;
    continue;
      }
  }

leave_node:
  /*
  * At this point we are done with the node, its content
  * and an element-nodes's attribute-nodes.
  */
  if (cur == node)
      break;
  if ((cur->type == XML_ELEMENT_NODE) ||
      (cur->type == XML_XINCLUDE_START) ||
      (cur->type == XML_XINCLUDE_END)) {
      /*
      * TODO: Do we expect nsDefs on XML_XINCLUDE_START?
      */
      if (XML_NSMAP_NOTEMPTY(nsMap)) {
    /*
    * Pop mappings.
    */
    while ((nsMap->last != NULL) &&
        (nsMap->last->depth >= depth))
    {
        XML_NSMAP_POP(nsMap, mi)
    }
    /*
    * Unshadow.
    */
    XML_NSMAP_FOREACH(nsMap, mi) {
        if (mi->shadowDepth >= depth)
      mi->shadowDepth = -1;
    }
      }
      depth--;
  }
  if (cur->next != NULL) {
      prevClone = clone;
      cur = cur->next;
  } else if (cur->type != XML_ATTRIBUTE_NODE) {
      /*
      * Set clone->last.
      */
      if (clone->parent != NULL)
    clone->parent->last = clone;
      clone = clone->parent;
      if (clone != NULL)
    parentClone = clone->parent;
      /*
      * Process parent --> next;
      */
      cur = cur->parent;
      goto leave_node;
  } else {
      /* This is for attributes only. */
      clone = clone->parent;
      parentClone = clone->parent;
      /*
      * Process parent-element --> children.
      */
      cur = cur->parent;
      goto into_content;
  }
    }
    goto exit;

internal_error:
    ret = -1;

exit:
    /*
    * Cleanup.
    */
    if (nsMap != NULL) {
  if ((ctxt) && (ctxt->namespaceMap == nsMap)) {
      /*
      * Just cleanup the map but don't free.
      */
      if (nsMap->first) {
    if (nsMap->pool)
        nsMap->last->next = nsMap->pool;
    nsMap->pool = nsMap->first;
    nsMap->first = NULL;
      }
  } else
      xmlDOMWrapNsMapFree(nsMap);
    }
    /*
    * TODO: Should we try a cleanup of the cloned node in case of a
    * fatal error?
    */
    *resNode = resultClone;
    return (ret);
}

/*
* xmlDOMWrapAdoptAttr:
* @ctxt: the optional context for custom processing
* @sourceDoc: the optional source document of attr
* @attr: the attribute-node to be adopted
* @destDoc: the destination doc for adoption
* @destParent: the optional new parent of @attr in @destDoc
* @options: option flags
*
* @attr is adopted by @destDoc.
* Ensures that ns-references point to @destDoc: either to
* elements->nsDef entries if @destParent is given, or to
* @destDoc->oldNs otherwise.
*
* Returns 0 if succeeded, -1 otherwise and on API/internal errors.
*/
static int
xmlDOMWrapAdoptAttr(xmlDOMWrapCtxtPtr ctxt,
        xmlDocPtr sourceDoc,
        xmlAttrPtr attr,
        xmlDocPtr destDoc,
        xmlNodePtr destParent,
        int options ATTRIBUTE_UNUSED)
{
    xmlNodePtr cur;
    int adoptStr = 1;

    if ((attr == NULL) || (destDoc == NULL))
  return (-1);

    attr->doc = destDoc;
    if (attr->ns != NULL) {
  xmlNsPtr ns = NULL;

  if (ctxt != NULL) {
      /* TODO: User defined. */
  }
  /* XML Namespace. */
  if (IS_STR_XML(attr->ns->prefix)) {
      ns = xmlTreeEnsureXMLDecl(destDoc);
  } else if (destParent == NULL) {
      /*
      * Store in @destDoc->oldNs.
      */
      ns = xmlDOMWrapStoreNs(destDoc, attr->ns->href, attr->ns->prefix);
  } else {
      /*
      * Declare on @destParent.
      */
      if (xmlSearchNsByNamespaceStrict(destDoc, destParent, attr->ns->href,
    &ns, 1) == -1)
    goto internal_error;
      if (ns == NULL) {
    ns = xmlDOMWrapNSNormDeclareNsForced(destDoc, destParent,
        attr->ns->href, attr->ns->prefix, 1);
      }
  }
  if (ns == NULL)
      goto internal_error;
  attr->ns = ns;
    }

    XML_TREE_ADOPT_STR(attr->name);
    attr->atype = 0;
    attr->psvi = NULL;
    /*
    * Walk content.
    */
    if (attr->children == NULL)
  return (0);
    cur = attr->children;
    if ((cur != NULL) && (cur->type == XML_NAMESPACE_DECL))
        goto internal_error;
    while (cur != NULL) {
  cur->doc = destDoc;
  switch (cur->type) {
      case XML_TEXT_NODE:
      case XML_CDATA_SECTION_NODE:
    XML_TREE_ADOPT_STR_2(cur->content)
    break;
      case XML_ENTITY_REF_NODE:
    /*
    * Remove reference to the entity-node.
    */
    cur->content = NULL;
    cur->children = NULL;
    cur->last = NULL;
    if ((destDoc->intSubset) || (destDoc->extSubset)) {
        xmlEntityPtr ent;
        /*
        * Assign new entity-node if available.
        */
        ent = xmlGetDocEntity(destDoc, cur->name);
        if (ent != NULL) {
      cur->content = ent->content;
      cur->children = (xmlNodePtr) ent;
      cur->last = (xmlNodePtr) ent;
        }
    }
    break;
      default:
    break;
  }
  if (cur->children != NULL) {
      cur = cur->children;
      continue;
  }
next_sibling:
  if (cur == (xmlNodePtr) attr)
      break;
  if (cur->next != NULL)
      cur = cur->next;
  else {
      cur = cur->parent;
      goto next_sibling;
  }
    }
    return (0);
internal_error:
    return (-1);
}

/*
* xmlDOMWrapAdoptNode:
* @ctxt: the optional context for custom processing
* @sourceDoc: the optional sourceDoc
* @node: the node to start with
* @destDoc: the destination doc
* @destParent: the optional new parent of @node in @destDoc
* @options: option flags
*
* References of out-of scope ns-decls are remapped to point to @destDoc:
* 1) If @destParent is given, then nsDef entries on element-nodes are used
* 2) If *no* @destParent is given, then @destDoc->oldNs entries are used
*    This is the case when you have an unlinked node and just want to move it
*    to the context of
*
* If @destParent is given, it ensures that the tree is namespace
* wellformed by creating additional ns-decls where needed.
* Note that, since prefixes of already existent ns-decls can be
* shadowed by this process, it could break QNames in attribute
* values or element content.
* NOTE: This function was not intensively tested.
*
* Returns 0 if the operation succeeded,
*         1 if a node of unsupported type was given,
*         2 if a node of not yet supported type was given and
*         -1 on API/internal errors.
*/
int
xmlDOMWrapAdoptNode(xmlDOMWrapCtxtPtr ctxt,
        xmlDocPtr sourceDoc,
        xmlNodePtr node,
        xmlDocPtr destDoc,
        xmlNodePtr destParent,
        int options)
{
    if ((node == NULL) || (node->type == XML_NAMESPACE_DECL) ||
        (destDoc == NULL) ||
  ((destParent != NULL) && (destParent->doc != destDoc)))
  return(-1);
    /*
    * Check node->doc sanity.
    */
    if ((node->doc != NULL) && (sourceDoc != NULL) &&
  (node->doc != sourceDoc)) {
  /*
  * Might be an XIncluded node.
  */
  return (-1);
    }
    if (sourceDoc == NULL)
  sourceDoc = node->doc;
    if (sourceDoc == destDoc)
  return (-1);
    switch (node->type) {
  case XML_ELEMENT_NODE:
  case XML_ATTRIBUTE_NODE:
  case XML_TEXT_NODE:
  case XML_CDATA_SECTION_NODE:
  case XML_ENTITY_REF_NODE:
  case XML_PI_NODE:
  case XML_COMMENT_NODE:
      break;
  case XML_DOCUMENT_FRAG_NODE:
      /* TODO: Support document-fragment-nodes. */
      return (2);
  default:
      return (1);
    }
    /*
    * Unlink only if @node was not already added to @destParent.
    */
    if ((node->parent != NULL) && (destParent != node->parent))
  xmlUnlinkNode(node);

    if (node->type == XML_ELEMENT_NODE) {
      return (xmlDOMWrapAdoptBranch(ctxt, sourceDoc, node,
        destDoc, destParent, options));
    } else if (node->type == XML_ATTRIBUTE_NODE) {
      return (xmlDOMWrapAdoptAttr(ctxt, sourceDoc,
    (xmlAttrPtr) node, destDoc, destParent, options));
    } else {
  xmlNodePtr cur = node;
  int adoptStr = 1;

  cur->doc = destDoc;
  /*
  * Optimize string adoption.
  */
  if ((sourceDoc != NULL) &&
      (sourceDoc->dict == destDoc->dict))
    adoptStr = 0;
  switch (node->type) {
      case XML_TEXT_NODE:
      case XML_CDATA_SECTION_NODE:
    XML_TREE_ADOPT_STR_2(node->content)
        break;
      case XML_ENTITY_REF_NODE:
    /*
    * Remove reference to the entity-node.
    */
    node->content = NULL;
    node->children = NULL;
    node->last = NULL;
    if ((destDoc->intSubset) || (destDoc->extSubset)) {
        xmlEntityPtr ent;
        /*
        * Assign new entity-node if available.
        */
        ent = xmlGetDocEntity(destDoc, node->name);
        if (ent != NULL) {
      node->content = ent->content;
      node->children = (xmlNodePtr) ent;
      node->last = (xmlNodePtr) ent;
        }
    }
    XML_TREE_ADOPT_STR(node->name)
    break;
      case XML_PI_NODE: {
    XML_TREE_ADOPT_STR(node->name)
    XML_TREE_ADOPT_STR_2(node->content)
    break;
      }
      default:
    break;
  }
    }
    return (0);
}

/************************************************************************
 *                  *
 *      XHTML detection         *
 *                  *
 ************************************************************************/

#define XHTML_STRICT_PUBLIC_ID BAD_CAST \
   "-//W3C//DTD XHTML 1.0 Strict//EN"
#define XHTML_STRICT_SYSTEM_ID BAD_CAST \
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
#define XHTML_FRAME_PUBLIC_ID BAD_CAST \
   "-//W3C//DTD XHTML 1.0 Frameset//EN"
#define XHTML_FRAME_SYSTEM_ID BAD_CAST \
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"
#define XHTML_TRANS_PUBLIC_ID BAD_CAST \
   "-//W3C//DTD XHTML 1.0 Transitional//EN"
#define XHTML_TRANS_SYSTEM_ID BAD_CAST \
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"

/**
 * xmlIsXHTML:
 * @systemID:  the system identifier
 * @publicID:  the public identifier
 *
 * Try to find if the document correspond to an XHTML DTD
 *
 * Returns 1 if true, 0 if not and -1 in case of error
 */
int
xmlIsXHTML(const xmlChar *systemID, const xmlChar *publicID) {
    if ((systemID == NULL) && (publicID == NULL))
  return(-1);
    if (publicID != NULL) {
  if (xmlStrEqual(publicID, XHTML_STRICT_PUBLIC_ID)) return(1);
  if (xmlStrEqual(publicID, XHTML_FRAME_PUBLIC_ID)) return(1);
  if (xmlStrEqual(publicID, XHTML_TRANS_PUBLIC_ID)) return(1);
    }
    if (systemID != NULL) {
  if (xmlStrEqual(systemID, XHTML_STRICT_SYSTEM_ID)) return(1);
  if (xmlStrEqual(systemID, XHTML_FRAME_SYSTEM_ID)) return(1);
  if (xmlStrEqual(systemID, XHTML_TRANS_SYSTEM_ID)) return(1);
    }
    return(0);
}


Coverage Report

Created: 2023-12-13 20:03