/*

 * xmlmemory.c:  libxml memory allocator wrapper.

 *

 * daniel@veillard.com

 */

#define IN_LIBXML

#include "libxml.h"

#include <string.h>

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_TIME_H

#include <time.h>

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#else

#ifdef HAVE_MALLOC_H

#include <malloc.h>

#endif

#endif

#ifdef HAVE_CTYPE_H

#include <ctype.h>

#endif

/* #define DEBUG_MEMORY */

/**

 * MEM_LIST:

 *

 * keep track of all allocated blocks for error reporting

 * Always build the memory list !

 */

#ifdef DEBUG_MEMORY_LOCATION

#ifndef MEM_LIST

#define MEM_LIST /* keep a list of all the allocated memory blocks */

#endif

#endif

#include <libxml/globals.h> /* must come before xmlmemory.h */

#include <libxml/xmlmemory.h>

#include <libxml/xmlerror.h>

#include <libxml/threads.h>

static int xmlMemInitialized = 0;

static unsigned long  debugMemSize = 0;

static unsigned long  debugMemBlocks = 0;

static unsigned long  debugMaxMemSize = 0;

static xmlMutexPtr xmlMemMutex = NULL;

void xmlMallocBreakpoint(void);

/************************************************************************

 *                  *

 *    Macros, variables and associated types      *

 *                  *

 ************************************************************************/

#if !defined(LIBXML_THREAD_ENABLED) && !defined(LIBXML_THREAD_ALLOC_ENABLED)

#ifdef xmlMalloc

#undef xmlMalloc

#endif

#ifdef xmlRealloc

#undef xmlRealloc

#endif

#ifdef xmlMemStrdup

#undef xmlMemStrdup

#endif

#endif

/*

 * Each of the blocks allocated begin with a header containing informations

 */

#define MEMTAG 0x5aa5

#define MALLOC_TYPE 1

#define REALLOC_TYPE 2

#define STRDUP_TYPE 3

#define MALLOC_ATOMIC_TYPE 4

#define REALLOC_ATOMIC_TYPE 5

typedef struct memnod {

    unsigned int   mh_tag;

    unsigned int   mh_type;

    unsigned long  mh_number;

    size_t         mh_size;

#ifdef MEM_LIST

   struct memnod *mh_next;

   struct memnod *mh_prev;

#endif

   const char    *mh_file;

   unsigned int   mh_line;

}  MEMHDR;

#ifdef SUN4

#define ALIGN_SIZE  16

#else

#define ALIGN_SIZE  sizeof(double)

#endif

#define HDR_SIZE    sizeof(MEMHDR)

#define RESERVE_SIZE (((HDR_SIZE + (ALIGN_SIZE-1)) \

          / ALIGN_SIZE ) * ALIGN_SIZE)

#define MAX_SIZE_T ((size_t)-1)

#define CLIENT_2_HDR(a) ((void *) (((char *) (a)) - RESERVE_SIZE))

#define HDR_2_CLIENT(a)    ((void *) (((char *) (a)) + RESERVE_SIZE))

static unsigned int block=0;

static unsigned int xmlMemStopAtBlock = 0;

static void *xmlMemTraceBlockAt = NULL;

#ifdef MEM_LIST

static MEMHDR *memlist = NULL;

#endif

static void debugmem_tag_error(void *addr);

#ifdef MEM_LIST

static void  debugmem_list_add(MEMHDR *);

static void debugmem_list_delete(MEMHDR *);

#endif

#define Mem_Tag_Err(a) debugmem_tag_error(a);

#ifndef TEST_POINT

#define TEST_POINT

#endif

/**

 * xmlMallocBreakpoint:

 *

 * Breakpoint to use in conjunction with xmlMemStopAtBlock. When the block

 * number reaches the specified value this function is called. One need to add a breakpoint

 * to it to get the context in which the given block is allocated.

 */

void

xmlMallocBreakpoint(void) {

    xmlGenericError(xmlGenericErrorContext,

      "xmlMallocBreakpoint reached on block %d\n", xmlMemStopAtBlock);

}

/**

 * xmlMallocLoc:

 * @size:  an int specifying the size in byte to allocate.

 * @file:  the file name or NULL

 * @line:  the line number

 *

 * a malloc() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the allocated area or NULL in case of lack of memory.

 */

void *

xmlMallocLoc(size_t size, const char * file, int line)

{

    MEMHDR *p;

    void *ret;

    if (!xmlMemInitialized) xmlInitMemory();

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Malloc(%d)\n",size);

#endif

    TEST_POINT

    if (size > (MAX_SIZE_T - RESERVE_SIZE)) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlMallocLoc : Unsigned overflow\n");

  xmlMemoryDump();

  return(NULL);

    }

    p = (MEMHDR *) malloc(RESERVE_SIZE+size);

    if (!p) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlMallocLoc : Out of free space\n");

  xmlMemoryDump();

  return(NULL);

    }

    p->mh_tag = MEMTAG;

    p->mh_size = size;

    p->mh_type = MALLOC_TYPE;

    p->mh_file = file;

    p->mh_line = line;

    xmlMutexLock(xmlMemMutex);

    p->mh_number = ++block;

    debugMemSize += size;

    debugMemBlocks++;

    if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;

#ifdef MEM_LIST

    debugmem_list_add(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Malloc(%d) Ok\n",size);

#endif

    if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();

    ret = HDR_2_CLIENT(p);

    if (xmlMemTraceBlockAt == ret) {

  xmlGenericError(xmlGenericErrorContext,

      "%p : Malloc(%lu) Ok\n", xmlMemTraceBlockAt,

      (long unsigned)size);

  xmlMallocBreakpoint();

    }

    TEST_POINT

    return(ret);

}

/**

 * xmlMallocAtomicLoc:

 * @size:  an unsigned int specifying the size in byte to allocate.

 * @file:  the file name or NULL

 * @line:  the line number

 *

 * a malloc() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the allocated area or NULL in case of lack of memory.

 */

void *

xmlMallocAtomicLoc(size_t size, const char * file, int line)

{

    MEMHDR *p;

    void *ret;

    if (!xmlMemInitialized) xmlInitMemory();

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Malloc(%d)\n",size);

#endif

    TEST_POINT

    if (size > (MAX_SIZE_T - RESERVE_SIZE)) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlMallocAtomicLoc : Unsigned overflow\n");

  xmlMemoryDump();

  return(NULL);

    }

    p = (MEMHDR *) malloc(RESERVE_SIZE+size);

    if (!p) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlMallocAtomicLoc : Out of free space\n");

  xmlMemoryDump();

  return(NULL);

    }

    p->mh_tag = MEMTAG;

    p->mh_size = size;

    p->mh_type = MALLOC_ATOMIC_TYPE;

    p->mh_file = file;

    p->mh_line = line;

    xmlMutexLock(xmlMemMutex);

    p->mh_number = ++block;

    debugMemSize += size;

    debugMemBlocks++;

    if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;

#ifdef MEM_LIST

    debugmem_list_add(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Malloc(%d) Ok\n",size);

#endif

    if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();

    ret = HDR_2_CLIENT(p);

    if (xmlMemTraceBlockAt == ret) {

  xmlGenericError(xmlGenericErrorContext,

      "%p : Malloc(%lu) Ok\n", xmlMemTraceBlockAt,

      (long unsigned)size);

  xmlMallocBreakpoint();

    }

    TEST_POINT

    return(ret);

}

/**

 * xmlMemMalloc:

 * @size:  an int specifying the size in byte to allocate.

 *

 * a malloc() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the allocated area or NULL in case of lack of memory.

 */

void *

xmlMemMalloc(size_t size)

{

    return(xmlMallocLoc(size, "none", 0));

}

/**

 * xmlReallocLoc:

 * @ptr:  the initial memory block pointer

 * @size:  an int specifying the size in byte to allocate.

 * @file:  the file name or NULL

 * @line:  the line number

 *

 * a realloc() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the allocated area or NULL in case of lack of memory.

 */

void *

xmlReallocLoc(void *ptr,size_t size, const char * file, int line)

{

    MEMHDR *p, *tmp;

    unsigned long number;

#ifdef DEBUG_MEMORY

    size_t oldsize;

#endif

    if (ptr == NULL)

        return(xmlMallocLoc(size, file, line));

    if (!xmlMemInitialized) xmlInitMemory();

    TEST_POINT

    p = CLIENT_2_HDR(ptr);

    number = p->mh_number;

    if (xmlMemStopAtBlock == number) xmlMallocBreakpoint();

    if (p->mh_tag != MEMTAG) {

       Mem_Tag_Err(p);

   goto error;

    }

    p->mh_tag = ~MEMTAG;

    xmlMutexLock(xmlMemMutex);

    debugMemSize -= p->mh_size;

    debugMemBlocks--;

#ifdef DEBUG_MEMORY

    oldsize = p->mh_size;

#endif

#ifdef MEM_LIST

    debugmem_list_delete(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

    if (size > (MAX_SIZE_T - RESERVE_SIZE)) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlReallocLoc : Unsigned overflow\n");

  xmlMemoryDump();

  return(NULL);

    }

    tmp = (MEMHDR *) realloc(p,RESERVE_SIZE+size);

    if (!tmp) {

   free(p);

   goto error;

    }

    p = tmp;

    if (xmlMemTraceBlockAt == ptr) {

  xmlGenericError(xmlGenericErrorContext,

      "%p : Realloced(%lu -> %lu) Ok\n",

      xmlMemTraceBlockAt, (long unsigned)p->mh_size,

      (long unsigned)size);

  xmlMallocBreakpoint();

    }

    p->mh_tag = MEMTAG;

    p->mh_number = number;

    p->mh_type = REALLOC_TYPE;

    p->mh_size = size;

    p->mh_file = file;

    p->mh_line = line;

    xmlMutexLock(xmlMemMutex);

    debugMemSize += size;

    debugMemBlocks++;

    if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;

#ifdef MEM_LIST

    debugmem_list_add(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

    TEST_POINT

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Realloced(%d to %d) Ok\n", oldsize, size);

#endif

    return(HDR_2_CLIENT(p));

error:

    return(NULL);

}

/**

 * xmlMemRealloc:

 * @ptr:  the initial memory block pointer

 * @size:  an int specifying the size in byte to allocate.

 *

 * a realloc() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the allocated area or NULL in case of lack of memory.

 */

void *

xmlMemRealloc(void *ptr,size_t size) {

    return(xmlReallocLoc(ptr, size, "none", 0));

}

/**

 * xmlMemFree:

 * @ptr:  the memory block pointer

 *

 * a free() equivalent, with error checking.

 */

void

xmlMemFree(void *ptr)

{

    MEMHDR *p;

    char *target;

#ifdef DEBUG_MEMORY

    size_t size;

#endif

    if (ptr == NULL)

  return;

    if (ptr == (void *) -1) {

  xmlGenericError(xmlGenericErrorContext,

      "trying to free pointer from freed area\n");

        goto error;

    }

    if (xmlMemTraceBlockAt == ptr) {

  xmlGenericError(xmlGenericErrorContext,

      "%p : Freed()\n", xmlMemTraceBlockAt);

  xmlMallocBreakpoint();

    }

    TEST_POINT

    target = (char *) ptr;

    p = CLIENT_2_HDR(ptr);

    if (p->mh_tag != MEMTAG) {

        Mem_Tag_Err(p);

        goto error;

    }

    if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();

    p->mh_tag = ~MEMTAG;

    memset(target, -1, p->mh_size);

    xmlMutexLock(xmlMemMutex);

    debugMemSize -= p->mh_size;

    debugMemBlocks--;

#ifdef DEBUG_MEMORY

    size = p->mh_size;

#endif

#ifdef MEM_LIST

    debugmem_list_delete(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

    free(p);

    TEST_POINT

#ifdef DEBUG_MEMORY

    xmlGenericError(xmlGenericErrorContext,

      "Freed(%d) Ok\n", size);

#endif

    return;

error:

    xmlGenericError(xmlGenericErrorContext,

      "xmlMemFree(%p) error\n", ptr);

    xmlMallocBreakpoint();

    return;

}

/**

 * xmlMemStrdupLoc:

 * @str:  the initial string pointer

 * @file:  the file name or NULL

 * @line:  the line number

 *

 * a strdup() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the new string or NULL if allocation error occurred.

 */

char *

xmlMemStrdupLoc(const char *str, const char *file, int line)

{

    char *s;

    size_t size = strlen(str) + 1;

    MEMHDR *p;

    if (!xmlMemInitialized) xmlInitMemory();

    TEST_POINT

    if (size > (MAX_SIZE_T - RESERVE_SIZE)) {

  xmlGenericError(xmlGenericErrorContext,

    "xmlMemStrdupLoc : Unsigned overflow\n");

  xmlMemoryDump();

  return(NULL);

    }

    p = (MEMHDR *) malloc(RESERVE_SIZE+size);

    if (!p) {

      goto error;

    }

    p->mh_tag = MEMTAG;

    p->mh_size = size;

    p->mh_type = STRDUP_TYPE;

    p->mh_file = file;

    p->mh_line = line;

    xmlMutexLock(xmlMemMutex);

    p->mh_number = ++block;

    debugMemSize += size;

    debugMemBlocks++;

    if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;

#ifdef MEM_LIST

    debugmem_list_add(p);

#endif

    xmlMutexUnlock(xmlMemMutex);

    s = (char *) HDR_2_CLIENT(p);

    if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();

    strcpy(s,str);

    TEST_POINT

    if (xmlMemTraceBlockAt == s) {

  xmlGenericError(xmlGenericErrorContext,

      "%p : Strdup() Ok\n", xmlMemTraceBlockAt);

  xmlMallocBreakpoint();

    }

    return(s);

error:

    return(NULL);

}

/**

 * xmlMemoryStrdup:

 * @str:  the initial string pointer

 *

 * a strdup() equivalent, with logging of the allocation info.

 *

 * Returns a pointer to the new string or NULL if allocation error occurred.

 */

char *

xmlMemoryStrdup(const char *str) {

    return(xmlMemStrdupLoc(str, "none", 0));

}

/**

 * xmlMemUsed:

 *

 * Provides the amount of memory currently allocated

 *

 * Returns an int representing the amount of memory allocated.

 */

int

xmlMemUsed(void) {

    int res;

    xmlMutexLock(xmlMemMutex);

    res = debugMemSize;

    xmlMutexUnlock(xmlMemMutex);

    return(res);

}

/**

 * xmlMemBlocks:

 *

 * Provides the number of memory areas currently allocated

 *

 * Returns an int representing the number of blocks

 */

int

xmlMemBlocks(void) {

    int res;

    xmlMutexLock(xmlMemMutex);

    res = debugMemBlocks;

    xmlMutexUnlock(xmlMemMutex);

    return(res);

}

#ifdef MEM_LIST

/**

 * xmlMemContentShow:

 * @fp:  a FILE descriptor used as the output file

 * @p:  a memory block header

 *

 * tries to show some content from the memory block

 */

static void

xmlMemContentShow(FILE *fp, MEMHDR *p)

{

    int i,j,k,len;

    const char *buf;

    if (p == NULL) {

  fprintf(fp, " NULL");

  return;

    }

    len = p->mh_size;

    buf = (const char *) HDR_2_CLIENT(p);

    for (i = 0;i < len;i++) {

        if (buf[i] == 0) break;

  if (!isprint((unsigned char) buf[i])) break;

    }

    if ((i < 4) && ((buf[i] != 0) || (i == 0))) {

        if (len >= 4) {

      MEMHDR *q;

      void *cur;

            for (j = 0;(j < len -3) && (j < 40);j += 4) {

    cur = *((void **) &buf[j]);

    q = CLIENT_2_HDR(cur);

    p = memlist;

    k = 0;

    while (p != NULL) {

        if (p == q) break;

        p = p->mh_next;

        if (k++ > 100) break;

    }

    if ((p != NULL) && (p == q)) {

        fprintf(fp, " pointer to #%lu at index %d",

                p->mh_number, j);

        return;

    }

      }

  }

    } else if ((i == 0) && (buf[i] == 0)) {

        fprintf(fp," null");

    } else {

        if (buf[i] == 0) fprintf(fp," \"%.25s\"", buf);

  else {

            fprintf(fp," [");

      for (j = 0;j < i;j++)

                fprintf(fp,"%c", buf[j]);

            fprintf(fp,"]");

  }

    }

}

#endif

/**

 * xmlMemDisplayLast:

 * @fp:  a FILE descriptor used as the output file, if NULL, the result is

 *       written to the file .memorylist

 * @nbBytes: the amount of memory to dump

 *

 * the last nbBytes of memory allocated and not freed, useful for dumping

 * the memory left allocated between two places at runtime.

 */

void

xmlMemDisplayLast(FILE *fp, long nbBytes)

{

#ifdef MEM_LIST

    MEMHDR *p;

    unsigned idx;

    int     nb = 0;

#endif

    FILE *old_fp = fp;

    if (nbBytes <= 0)

        return;

    if (fp == NULL) {

  fp = fopen(".memorylist", "w");

  if (fp == NULL)

      return;

    }

#ifdef MEM_LIST

    fprintf(fp,"   Last %li MEMORY ALLOCATED : %lu, MAX was %lu\n",

            nbBytes, debugMemSize, debugMaxMemSize);

    fprintf(fp,"BLOCK  NUMBER   SIZE  TYPE\n");

    idx = 0;

    xmlMutexLock(xmlMemMutex);

    p = memlist;

    while ((p) && (nbBytes > 0)) {

    fprintf(fp,"%-5u  %6lu %6lu ",idx++,p->mh_number,

      (unsigned long)p->mh_size);

        switch (p->mh_type) {

           case STRDUP_TYPE:fprintf(fp,"strdup()  in ");break;

           case MALLOC_TYPE:fprintf(fp,"malloc()  in ");break;

           case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;

           case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc()  in ");break;

           case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;

           default:

          fprintf(fp,"Unknown memory block, may be corrupted");

    xmlMutexUnlock(xmlMemMutex);

    if (old_fp == NULL)

        fclose(fp);

    return;

        }

  if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);

        if (p->mh_tag != MEMTAG)

        fprintf(fp,"  INVALID");

        nb++;

  if (nb < 100)

      xmlMemContentShow(fp, p);

  else

      fprintf(fp," skip");

        fprintf(fp,"\n");

  nbBytes -= (unsigned long)p->mh_size;

        p = p->mh_next;

    }

    xmlMutexUnlock(xmlMemMutex);

#else

    fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");

#endif

    if (old_fp == NULL)

  fclose(fp);

}

/**

 * xmlMemDisplay:

 * @fp:  a FILE descriptor used as the output file, if NULL, the result is

 *       written to the file .memorylist

 *

 * show in-extenso the memory blocks allocated

 */

void

xmlMemDisplay(FILE *fp)

{

#ifdef MEM_LIST

    MEMHDR *p;

    unsigned idx;

    int     nb = 0;

#if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)

    time_t currentTime;

    char buf[500];

    struct tm * tstruct;

#endif

#endif

    FILE *old_fp = fp;

    if (fp == NULL) {

  fp = fopen(".memorylist", "w");

  if (fp == NULL)

      return;

    }

#ifdef MEM_LIST

#if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)

    currentTime = time(NULL);

    tstruct = localtime(&currentTime);

    strftime(buf, sizeof(buf) - 1, "%I:%M:%S %p", tstruct);

    fprintf(fp,"      %s\n\n", buf);

#endif

    fprintf(fp,"      MEMORY ALLOCATED : %lu, MAX was %lu\n",

            debugMemSize, debugMaxMemSize);

    fprintf(fp,"BLOCK  NUMBER   SIZE  TYPE\n");

    idx = 0;

    xmlMutexLock(xmlMemMutex);

    p = memlist;

    while (p) {

    fprintf(fp,"%-5u  %6lu %6lu ",idx++,p->mh_number,

      (unsigned long)p->mh_size);

        switch (p->mh_type) {

           case STRDUP_TYPE:fprintf(fp,"strdup()  in ");break;

           case MALLOC_TYPE:fprintf(fp,"malloc()  in ");break;

           case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;

           case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc()  in ");break;

           case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;

           default:

          fprintf(fp,"Unknown memory block, may be corrupted");

    xmlMutexUnlock(xmlMemMutex);

    if (old_fp == NULL)

        fclose(fp);

    return;

        }

  if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);

        if (p->mh_tag != MEMTAG)

        fprintf(fp,"  INVALID");

        nb++;

  if (nb < 100)

      xmlMemContentShow(fp, p);

  else

      fprintf(fp," skip");

        fprintf(fp,"\n");

        p = p->mh_next;

    }

    xmlMutexUnlock(xmlMemMutex);

#else

    fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");

#endif

    if (old_fp == NULL)

  fclose(fp);

}

#ifdef MEM_LIST

static void debugmem_list_add(MEMHDR *p)

{

     p->mh_next = memlist;

     p->mh_prev = NULL;

     if (memlist) memlist->mh_prev = p;

     memlist = p;

#ifdef MEM_LIST_DEBUG

     if (stderr)

     Mem_Display(stderr);

#endif

}

static void debugmem_list_delete(MEMHDR *p)

{

     if (p->mh_next)

     p->mh_next->mh_prev = p->mh_prev;

     if (p->mh_prev)

     p->mh_prev->mh_next = p->mh_next;

     else memlist = p->mh_next;

#ifdef MEM_LIST_DEBUG

     if (stderr)

     Mem_Display(stderr);

#endif

}

#endif

/*

 * debugmem_tag_error:

 *

 * internal error function.

 */

static void debugmem_tag_error(void *p)

{

     xmlGenericError(xmlGenericErrorContext,

       "Memory tag error occurs :%p \n\t bye\n", p);

#ifdef MEM_LIST

     if (stderr)

     xmlMemDisplay(stderr);

#endif

}

#ifdef MEM_LIST

static FILE *xmlMemoryDumpFile = NULL;

#endif

/**

 * xmlMemShow:

 * @fp:  a FILE descriptor used as the output file

 * @nr:  number of entries to dump

 *

 * show a show display of the memory allocated, and dump

 * the @nr last allocated areas which were not freed

 */

void

xmlMemShow(FILE *fp, int nr ATTRIBUTE_UNUSED)

{

#ifdef MEM_LIST

    MEMHDR *p;

#endif

    if (fp != NULL)

  fprintf(fp,"      MEMORY ALLOCATED : %lu, MAX was %lu\n",

    debugMemSize, debugMaxMemSize);

#ifdef MEM_LIST

    xmlMutexLock(xmlMemMutex);

    if (nr > 0) {

  fprintf(fp,"NUMBER   SIZE  TYPE   WHERE\n");

  p = memlist;

  while ((p) && nr > 0) {

        fprintf(fp,"%6lu %6lu ",p->mh_number,(unsigned long)p->mh_size);

      switch (p->mh_type) {

         case STRDUP_TYPE:fprintf(fp,"strdup()  in ");break;

         case MALLOC_TYPE:fprintf(fp,"malloc()  in ");break;

         case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc()  in ");break;

        case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;

        case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;

    default:fprintf(fp,"   ???    in ");break;

      }

      if (p->mh_file != NULL)

          fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);

      if (p->mh_tag != MEMTAG)

    fprintf(fp,"  INVALID");

      xmlMemContentShow(fp, p);

      fprintf(fp,"\n");

      nr--;

      p = p->mh_next;

  }

    }

    xmlMutexUnlock(xmlMemMutex);

#endif /* MEM_LIST */

}

/**

 * xmlMemoryDump:

 *

 * Dump in-extenso the memory blocks allocated to the file .memorylist

 */

void

xmlMemoryDump(void)

{

#ifdef MEM_LIST

    FILE *dump;

    if (debugMaxMemSize == 0)

  return;

    dump = fopen(".memdump", "w");

    if (dump == NULL)

  xmlMemoryDumpFile = stderr;

    else xmlMemoryDumpFile = dump;

    xmlMemDisplay(xmlMemoryDumpFile);

    if (dump != NULL) fclose(dump);

#endif /* MEM_LIST */

}

/****************************************************************

 *                *

 *    Initialization Routines       *

 *                *

 ****************************************************************/

/**

 * xmlInitMemory:

 *

 * Initialize the memory layer.

 *

 * Returns 0 on success

 */

int

xmlInitMemory(void)

{

#ifdef HAVE_STDLIB_H

     char *breakpoint;

#endif

#ifdef DEBUG_MEMORY

     xmlGenericError(xmlGenericErrorContext,

       "xmlInitMemory()\n");

#endif

    /*

     This is really not good code (see Bug 130419).  Suggestions for

     improvement will be welcome!

    */

     if (xmlMemInitialized) return(-1);

     xmlMemInitialized = 1;

     xmlMemMutex = xmlNewMutex();

#ifdef HAVE_STDLIB_H

     breakpoint = getenv("XML_MEM_BREAKPOINT");

     if (breakpoint != NULL) {

         sscanf(breakpoint, "%ud", &xmlMemStopAtBlock);

     }

#endif

#ifdef HAVE_STDLIB_H

     breakpoint = getenv("XML_MEM_TRACE");

     if (breakpoint != NULL) {

         sscanf(breakpoint, "%p", &xmlMemTraceBlockAt);

     }

#endif

#ifdef DEBUG_MEMORY

     xmlGenericError(xmlGenericErrorContext,

       "xmlInitMemory() Ok\n");

#endif

     return(0);

}

/**

 * xmlCleanupMemory:

 *

 * Free up all the memory allocated by the library for its own

 * use. This should not be called by user level code.

 */

void

xmlCleanupMemory(void) {

#ifdef DEBUG_MEMORY