/src/php-src/Zend/zend_virtual_cwd.c

Source
/*
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Sascha Schumann <sascha@schumann.cx>                        |
   |          Pierre Joye <pierre@php.net>                                |
   +----------------------------------------------------------------------+
*/

#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>

#include "zend.h"
#include "zend_virtual_cwd.h"

#ifdef ZEND_WIN32
#include <io.h>
#include "tsrm_win32.h"
# ifndef IO_REPARSE_TAG_SYMLINK
#  define IO_REPARSE_TAG_SYMLINK 0xA000000C
# endif

# ifndef IO_REPARSE_TAG_DEDUP
#  define IO_REPARSE_TAG_DEDUP   0x80000013
# endif

# ifndef IO_REPARSE_TAG_CLOUD
#  define IO_REPARSE_TAG_CLOUD    (0x9000001AL)
# endif
/* IO_REPARSE_TAG_CLOUD_1 through IO_REPARSE_TAG_CLOUD_F have values of 0x9000101AL
   to 0x9000F01AL, they can be checked against the mask. */
#ifndef IO_REPARSE_TAG_CLOUD_MASK
#define IO_REPARSE_TAG_CLOUD_MASK (0x0000F000L)
#endif

#ifndef IO_REPARSE_TAG_ONEDRIVE
#define IO_REPARSE_TAG_ONEDRIVE   (0x80000021L)
#endif

# ifndef IO_REPARSE_TAG_ACTIVISION_HSM
#  define IO_REPARSE_TAG_ACTIVISION_HSM (0x00000047L)
# endif

# ifndef IO_REPARSE_TAG_PROJFS
#  define IO_REPARSE_TAG_PROJFS (0x9000001CL)
# endif

# ifndef VOLUME_NAME_NT
#  define VOLUME_NAME_NT 0x2
# endif

# ifndef VOLUME_NAME_DOS
#  define VOLUME_NAME_DOS 0x0
# endif

# include <winioctl.h>
# include <winnt.h>
#endif

#define VIRTUAL_CWD_DEBUG 0

#include "TSRM.h"

/* Only need mutex for popen() in Windows because it doesn't chdir() on UNIX */
#if defined(ZEND_WIN32) && defined(ZTS)
MUTEX_T cwd_mutex;
#endif

#ifdef ZTS
ts_rsrc_id cwd_globals_id;
size_t     cwd_globals_offset;
#else
virtual_cwd_globals cwd_globals;
#endif

static cwd_state main_cwd_state; /* True global */

#ifndef ZEND_WIN32
#include <unistd.h>
#else
#include <direct.h>
#include "zend_globals.h"
#include "zend_globals_macros.h"
#endif

#define CWD_STATE_COPY(d, s)        \
  (d)->cwd_length = (s)->cwd_length;    \
  (d)->cwd = (char *) emalloc((s)->cwd_length+1);  \
  memcpy((d)->cwd, (s)->cwd, (s)->cwd_length+1);

#define CWD_STATE_FREE(s)     \
  efree((s)->cwd); \
  (s)->cwd_length = 0;

#ifdef ZEND_WIN32
# define CWD_STATE_FREE_ERR(state) do { \
    DWORD last_error = GetLastError(); \
    CWD_STATE_FREE(state); \
    SetLastError(last_error); \
  } while (0)
#else
# define CWD_STATE_FREE_ERR(state) CWD_STATE_FREE(state)
#endif

static int php_is_dir_ok(const cwd_state *state)  /* {{{ */
{
  zend_stat_t buf = {0};

  if (php_sys_stat(state->cwd, &buf) == 0 && S_ISDIR(buf.st_mode))
    return (0);

  return (1);
}
/* }}} */

static int php_is_file_ok(const cwd_state *state)  /* {{{ */
{
  zend_stat_t buf = {0};

  if (php_sys_stat(state->cwd, &buf) == 0 && S_ISREG(buf.st_mode))
    return (0);

  return (1);
}
/* }}} */

static void cwd_globals_ctor(virtual_cwd_globals *cwd_g) /* {{{ */
{
  CWD_STATE_COPY(&cwd_g->cwd, &main_cwd_state);
  cwd_g->realpath_cache_size = 0;
  cwd_g->realpath_cache_size_limit = REALPATH_CACHE_SIZE;
  cwd_g->realpath_cache_ttl = REALPATH_CACHE_TTL;
  memset(cwd_g->realpath_cache, 0, sizeof(cwd_g->realpath_cache));
}
/* }}} */

static void realpath_cache_clean_helper(uint32_t max_entries, realpath_cache_bucket **cache, zend_long *cache_size)
{
  uint32_t i;

  for (i = 0; i < max_entries; i++) {
    realpath_cache_bucket *p = cache[i];
    while (p != NULL) {
      realpath_cache_bucket *r = p;
      p = p->next;
      free(r);
    }
    cache[i] = NULL;
  }
  *cache_size = 0;
}

static void cwd_globals_dtor(virtual_cwd_globals *cwd_g) /* {{{ */
{
  realpath_cache_clean_helper(sizeof(cwd_g->realpath_cache)/sizeof(cwd_g->realpath_cache[0]), cwd_g->realpath_cache, &cwd_g->realpath_cache_size);
}
/* }}} */

void virtual_cwd_main_cwd_init(uint8_t reinit) /* {{{ */
{
  char cwd[MAXPATHLEN];
  char *result;

  if (reinit) {
    free(main_cwd_state.cwd);
  }

#ifdef ZEND_WIN32
  ZeroMemory(&cwd, sizeof(cwd));
  result = php_win32_ioutil_getcwd(cwd, sizeof(cwd));
#else
  result = getcwd(cwd, sizeof(cwd));
#endif

  if (!result) {
    cwd[0] = '\0';
  }

  main_cwd_state.cwd_length = strlen(cwd);
#ifdef ZEND_WIN32
  if (main_cwd_state.cwd_length >= 2 && cwd[1] == ':') {
    cwd[0] = toupper((unsigned char)cwd[0]);
  }
#endif
  main_cwd_state.cwd = strdup(cwd);
}
/* }}} */

CWD_API void virtual_cwd_startup(void) /* {{{ */
{
  virtual_cwd_main_cwd_init(0);
#ifdef ZTS
  ts_allocate_fast_id(&cwd_globals_id, &cwd_globals_offset, sizeof(virtual_cwd_globals), (ts_allocate_ctor) cwd_globals_ctor, (ts_allocate_dtor) cwd_globals_dtor);
#else
  cwd_globals_ctor(&cwd_globals);
#endif

#if (defined(ZEND_WIN32)) && defined(ZTS)
  cwd_mutex = tsrm_mutex_alloc();
#endif
}
/* }}} */

CWD_API void virtual_cwd_shutdown(void) /* {{{ */
{
#ifndef ZTS
  cwd_globals_dtor(&cwd_globals);
#endif
#if (defined(ZEND_WIN32)) && defined(ZTS)
  tsrm_mutex_free(cwd_mutex);
#endif

  free(main_cwd_state.cwd); /* Don't use CWD_STATE_FREE because the non global states will probably use emalloc()/efree() */
}
/* }}} */

CWD_API void virtual_cwd_activate(void) /* {{{ */
{
  if (CWDG(cwd).cwd == NULL) {
    CWD_STATE_COPY(&CWDG(cwd), &main_cwd_state);
  }
}
/* }}} */

CWD_API void virtual_cwd_deactivate(void) /* {{{ */
{
  if (CWDG(cwd).cwd != NULL) {
    CWD_STATE_FREE(&CWDG(cwd));
    CWDG(cwd).cwd = NULL;
  }
}
/* }}} */

CWD_API char *virtual_getcwd_ex(size_t *length) /* {{{ */
{
  cwd_state *state;

  state = &CWDG(cwd);

  if (state->cwd_length == 0) {
    char *retval;

    *length = 1;
    retval = (char *) emalloc(2);
    retval[0] = DEFAULT_SLASH;
    retval[1] = '\0';
    return retval;
  }

#ifdef ZEND_WIN32
  /* If we have something like C: */
  if (state->cwd_length == 2 && state->cwd[state->cwd_length-1] == ':') {
    char *retval;

    *length = state->cwd_length+1;
    retval = (char *) emalloc(*length+1);
    memcpy(retval, state->cwd, *length);
    retval[0] = toupper((unsigned char)retval[0]);
    retval[*length-1] = DEFAULT_SLASH;
    retval[*length] = '\0';
    return retval;
  }
#endif
  if (!state->cwd) {
    *length = 0;
    return NULL;
  }

  *length = state->cwd_length;
  return estrdup(state->cwd);
}
/* }}} */

/* Same semantics as UNIX getcwd() */
CWD_API char *virtual_getcwd(char *buf, size_t size) /* {{{ */
{
  size_t length;
  char *cwd;

  cwd = virtual_getcwd_ex(&length);

  if (buf == NULL) {
    return cwd;
  }
  if (length > size-1) {
    efree(cwd);
    errno = ERANGE; /* Is this OK? */
    return NULL;
  }
  if (!cwd) {
    return NULL;
  }
  memcpy(buf, cwd, length+1);
  efree(cwd);
  return buf;
}
/* }}} */

#ifdef ZEND_WIN32
static inline zend_ulong realpath_cache_key(const char *path, size_t path_len) /* {{{ */
{
  zend_ulong h;
  size_t bucket_key_len;
  const char *bucket_key_start = tsrm_win32_get_path_sid_key(path, path_len, &bucket_key_len);
  const char *bucket_key = bucket_key_start;
  const char *e;

  if (!bucket_key) {
    return 0;
  }

  e = bucket_key + bucket_key_len;
  for (h = Z_UL(2166136261); bucket_key < e;) {
    h *= Z_UL(16777619);
    h ^= *bucket_key++;
  }
  if (bucket_key_start != path) {
    HeapFree(GetProcessHeap(), 0, (LPVOID)bucket_key_start);
  }
  return h;
}
/* }}} */
#else
static inline zend_ulong realpath_cache_key(const char *path, size_t path_len) /* {{{ */
{
  zend_ulong h;
  const char *e = path + path_len;

  for (h = Z_UL(2166136261); path < e;) {
    h *= Z_UL(16777619);
    h ^= *path++;
  }

  return h;
}
/* }}} */
#endif /* defined(ZEND_WIN32) */

CWD_API void realpath_cache_clean(void) /* {{{ */
{
  realpath_cache_clean_helper(sizeof(CWDG(realpath_cache))/sizeof(CWDG(realpath_cache)[0]), CWDG(realpath_cache), &CWDG(realpath_cache_size));
}
/* }}} */

CWD_API void realpath_cache_del(const char *path, size_t path_len) /* {{{ */
{
  zend_ulong key = realpath_cache_key(path, path_len);
  zend_ulong n = key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
  realpath_cache_bucket **bucket = &CWDG(realpath_cache)[n];

  while (*bucket != NULL) {
    if (key == (*bucket)->key && path_len == (*bucket)->path_len &&
          memcmp(path, (*bucket)->path, path_len) == 0) {
      realpath_cache_bucket *r = *bucket;
      *bucket = (*bucket)->next;

      /* if the pointers match then only subtract the length of the path */
        if(r->path == r->realpath) {
        CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1;
      } else {
        CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1 + r->realpath_len + 1;
      }

      free(r);
      return;
    } else {
      bucket = &(*bucket)->next;
    }
  }
}
/* }}} */

static inline void realpath_cache_add(const char *path, size_t path_len, const char *realpath, size_t realpath_len, int is_dir, time_t t) /* {{{ */
{
  zend_long size = sizeof(realpath_cache_bucket) + path_len + 1;
  int same = 1;

  if (realpath_len != path_len ||
    memcmp(path, realpath, path_len) != 0) {
    size += realpath_len + 1;
    same = 0;
  }

  if (CWDG(realpath_cache_size) + size <= CWDG(realpath_cache_size_limit)) {
    realpath_cache_bucket *bucket = malloc(size);
    zend_ulong n;

    if (bucket == NULL) {
      return;
    }

    bucket->key = realpath_cache_key(path, path_len);
    bucket->path = (char*)bucket + sizeof(realpath_cache_bucket);
    memcpy(bucket->path, path, path_len+1);
    bucket->path_len = path_len;
    if (same) {
      bucket->realpath = bucket->path;
    } else {
      bucket->realpath = bucket->path + (path_len + 1);
      memcpy(bucket->realpath, realpath, realpath_len+1);
    }
    bucket->realpath_len = realpath_len;
    bucket->is_dir = is_dir > 0;
#ifdef ZEND_WIN32
    bucket->is_rvalid   = 0;
    bucket->is_readable = 0;
    bucket->is_wvalid   = 0;
    bucket->is_writable = 0;
#endif
    bucket->expires = t + CWDG(realpath_cache_ttl);
    n = bucket->key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
    bucket->next = CWDG(realpath_cache)[n];
    CWDG(realpath_cache)[n] = bucket;
    CWDG(realpath_cache_size) += size;
  }
}
/* }}} */

static inline realpath_cache_bucket* realpath_cache_find(const char *path, size_t path_len, time_t t) /* {{{ */
{
  zend_ulong key = realpath_cache_key(path, path_len);
  zend_ulong n = key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
  realpath_cache_bucket **bucket = &CWDG(realpath_cache)[n];

  while (*bucket != NULL) {
    if (CWDG(realpath_cache_ttl) && (*bucket)->expires < t) {
      realpath_cache_bucket *r = *bucket;
      *bucket = (*bucket)->next;

      /* if the pointers match then only subtract the length of the path */
        if(r->path == r->realpath) {
        CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1;
      } else {
        CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1 + r->realpath_len + 1;
      }
      free(r);
    } else if (key == (*bucket)->key && path_len == (*bucket)->path_len &&
          memcmp(path, (*bucket)->path, path_len) == 0) {
      return *bucket;
    } else {
      bucket = &(*bucket)->next;
    }
  }
  return NULL;
}
/* }}} */

CWD_API realpath_cache_bucket* realpath_cache_lookup(const char *path, size_t path_len, time_t t) /* {{{ */
{
  return realpath_cache_find(path, path_len, t);
}
/* }}} */

CWD_API zend_long realpath_cache_size(void)
{
  return CWDG(realpath_cache_size);
}

CWD_API zend_long realpath_cache_max_buckets(void)
{
  return (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
}

CWD_API realpath_cache_bucket** realpath_cache_get_buckets(void)
{
  return CWDG(realpath_cache);
}


#undef LINK_MAX
#define LINK_MAX 32

static size_t tsrm_realpath_r(char *path, size_t start, size_t len, int *ll, time_t *t, int use_realpath, bool is_dir, int *link_is_dir) /* {{{ */
{
  size_t i, j;
  int directory = 0, save;
#ifdef ZEND_WIN32
  WIN32_FIND_DATAW dataw;
  HANDLE hFind = INVALID_HANDLE_VALUE;
  ALLOCA_FLAG(use_heap_large)
  wchar_t *pathw = NULL;
  int may_retry_reparse_point;
#define FREE_PATHW() \
  do { free(pathw); } while(0);

#else
  zend_stat_t st = {0};
#endif
  realpath_cache_bucket *bucket;
  char *tmp;
  ALLOCA_FLAG(use_heap)

  while (1) {
    if (len <= start) {
      if (link_is_dir) {
        *link_is_dir = 1;
      }
      return start;
    }

    i = len;
    while (i > start && !IS_SLASH(path[i-1])) {
      i--;
    }
    assert(i < MAXPATHLEN);

    if (i == len ||
      (i + 1 == len && path[i] == '.')) {
      /* remove double slashes and '.' */
      len = EXPECTED(i > 0) ? i - 1 : 0;
      is_dir = true;
      continue;
    } else if (i + 2 == len && path[i] == '.' && path[i+1] == '.') {
      /* remove '..' and previous directory */
      is_dir = true;
      if (link_is_dir) {
        *link_is_dir = 1;
      }
      if (i <= start + 1) {
        return start ? start : len;
      }
      j = tsrm_realpath_r(path, start, i-1, ll, t, use_realpath, true, NULL);
      if (j > start && j != (size_t)-1) {
        j--;
        assert(i < MAXPATHLEN);
        while (j > start && !IS_SLASH(path[j])) {
          j--;
        }
        assert(i < MAXPATHLEN);
        if (!start) {
          /* leading '..' must not be removed in case of relative path */
          if (j == 0 && path[0] == '.' && path[1] == '.' &&
              IS_SLASH(path[2])) {
            path[3] = '.';
            path[4] = '.';
            path[5] = DEFAULT_SLASH;
            j = 5;
          } else if (j > 0 &&
              path[j+1] == '.' && path[j+2] == '.' &&
              IS_SLASH(path[j+3])) {
            j += 4;
            path[j++] = '.';
            path[j++] = '.';
            path[j] = DEFAULT_SLASH;
          }
        }
      } else if (!start && !j) {
        /* leading '..' must not be removed in case of relative path */
        path[0] = '.';
        path[1] = '.';
        path[2] = DEFAULT_SLASH;
        j = 2;
      }
      return j;
    }

    path[len] = 0;

    save = (use_realpath != CWD_EXPAND);

    if (start && save && CWDG(realpath_cache_size_limit)) {
      /* cache lookup for absolute path */
      if (!*t) {
        *t = time(0);
      }
      if ((bucket = realpath_cache_find(path, len, *t)) != NULL) {
        if (is_dir && !bucket->is_dir) {
          /* not a directory */
          return (size_t)-1;
        } else {
          if (link_is_dir) {
            *link_is_dir = bucket->is_dir;
          }
          memcpy(path, bucket->realpath, bucket->realpath_len + 1);
          return bucket->realpath_len;
        }
      }
    }

#ifdef ZEND_WIN32
retry_reparse_point:
    may_retry_reparse_point = 0;
    if (save) {
      pathw = php_win32_ioutil_any_to_w(path);
      if (!pathw) {
        return (size_t)-1;
      }
      PHP_WIN32_IOUTIL_CHECK_PATH_W(pathw, (size_t)-1, 1);
      hFind = FindFirstFileExW(pathw, FindExInfoBasic, &dataw, FindExSearchNameMatch, NULL, 0);
      if (INVALID_HANDLE_VALUE == hFind) {
        if (use_realpath == CWD_REALPATH) {
          /* file not found */
          FREE_PATHW()
          return (size_t)-1;
        }
        /* continue resolution anyway but don't save result in the cache */
        save = 0;
      } else {
        FindClose(hFind);
      }
    }

    tmp = do_alloca(len+1, use_heap);
    memcpy(tmp, path, len+1);

retry_reparse_tag_cloud:
    if(save &&
        !(IS_UNC_PATH(path, len) && len >= 3 && path[2] != '?') &&
                               (dataw.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
        ) {
      /* File is a reparse point. Get the target */
      HANDLE hLink = NULL;
      PHP_WIN32_IOUTIL_REPARSE_DATA_BUFFER * pbuffer;
      DWORD retlength = 0;
      size_t bufindex = 0;
      uint8_t isabsolute = 0;
      wchar_t * reparsetarget;
      BOOL isVolume = FALSE;
#if VIRTUAL_CWD_DEBUG
      char *printname = NULL;
#endif
      char *substitutename = NULL;
      size_t substitutename_len;
      size_t substitutename_off = 0;
      wchar_t tmpsubstname[MAXPATHLEN];

      if(++(*ll) > LINK_MAX) {
        free_alloca(tmp, use_heap);
        FREE_PATHW()
        return (size_t)-1;
      }

      hLink = CreateFileW(pathw,
          0,
          PHP_WIN32_IOUTIL_DEFAULT_SHARE_MODE,
          NULL,
          OPEN_EXISTING,
          FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS,
          NULL);
      if(hLink == INVALID_HANDLE_VALUE) {
        free_alloca(tmp, use_heap);
        FREE_PATHW()
        return (size_t)-1;
      }

      pbuffer = (PHP_WIN32_IOUTIL_REPARSE_DATA_BUFFER *)do_alloca(MAXIMUM_REPARSE_DATA_BUFFER_SIZE, use_heap_large);
      if (pbuffer == NULL) {
        CloseHandle(hLink);
        free_alloca(tmp, use_heap);
        FREE_PATHW()
        return (size_t)-1;
      }
      if(!DeviceIoControl(hLink, FSCTL_GET_REPARSE_POINT, NULL, 0, pbuffer,  MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &retlength, NULL)) {
        BY_HANDLE_FILE_INFORMATION fileInformation;

        free_alloca(pbuffer, use_heap_large);
        if ((dataw.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
            (dataw.dwReserved0 & ~IO_REPARSE_TAG_CLOUD_MASK) == IO_REPARSE_TAG_CLOUD &&
            EG(windows_version_info).dwMajorVersion >= 10 &&
            EG(windows_version_info).dwMinorVersion == 0 &&
            EG(windows_version_info).dwBuildNumber >= 18362 &&
            GetFileInformationByHandle(hLink, &fileInformation) &&
            !(fileInformation.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
          dataw.dwFileAttributes = fileInformation.dwFileAttributes;
          CloseHandle(hLink);
          (*ll)--;
          goto retry_reparse_tag_cloud;
        }
        free_alloca(tmp, use_heap);
        CloseHandle(hLink);
        FREE_PATHW()
        return (size_t)-1;
      }

      CloseHandle(hLink);

      if(pbuffer->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
        may_retry_reparse_point = 1;
        reparsetarget = pbuffer->SymbolicLinkReparseBuffer.ReparseTarget;
        isabsolute = pbuffer->SymbolicLinkReparseBuffer.Flags == 0;
#if VIRTUAL_CWD_DEBUG
        printname = php_win32_ioutil_w_to_any(reparsetarget + pbuffer->MountPointReparseBuffer.PrintNameOffset  / sizeof(WCHAR));
        if (!printname) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
#endif

        substitutename_len = pbuffer->MountPointReparseBuffer.SubstituteNameLength / sizeof(WCHAR);
        if (substitutename_len >= MAXPATHLEN) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
        memcpy(tmpsubstname, reparsetarget + pbuffer->MountPointReparseBuffer.SubstituteNameOffset / sizeof(WCHAR), pbuffer->MountPointReparseBuffer.SubstituteNameLength);
        tmpsubstname[substitutename_len] = L'\0';
        substitutename = php_win32_cp_conv_w_to_any(tmpsubstname, substitutename_len, &substitutename_len);
        if (!substitutename || substitutename_len >= MAXPATHLEN) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          free(substitutename);
#if VIRTUAL_CWD_DEBUG
          free(printname);
#endif
          FREE_PATHW()
          return (size_t)-1;
        }
      }
      else if(pbuffer->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
        isabsolute = 1;
        reparsetarget = pbuffer->MountPointReparseBuffer.ReparseTarget;
#if VIRTUAL_CWD_DEBUG
        printname = php_win32_ioutil_w_to_any(reparsetarget + pbuffer->MountPointReparseBuffer.PrintNameOffset  / sizeof(WCHAR));
        if (!printname) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
#endif


        substitutename_len = pbuffer->MountPointReparseBuffer.SubstituteNameLength / sizeof(WCHAR);
        if (substitutename_len >= MAXPATHLEN) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
        memcpy(tmpsubstname, reparsetarget + pbuffer->MountPointReparseBuffer.SubstituteNameOffset / sizeof(WCHAR), pbuffer->MountPointReparseBuffer.SubstituteNameLength);
        tmpsubstname[substitutename_len] = L'\0';
        substitutename = php_win32_cp_conv_w_to_any(tmpsubstname, substitutename_len, &substitutename_len);
        if (!substitutename || substitutename_len >= MAXPATHLEN) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          free(substitutename);
#if VIRTUAL_CWD_DEBUG
          free(printname);
#endif
          FREE_PATHW()
          return (size_t)-1;
        }
      }
      else if (pbuffer->ReparseTag == IO_REPARSE_TAG_DEDUP ||
          /* Starting with 1709. */
          (pbuffer->ReparseTag & ~IO_REPARSE_TAG_CLOUD_MASK) == IO_REPARSE_TAG_CLOUD ||
          IO_REPARSE_TAG_ONEDRIVE == pbuffer->ReparseTag ||
          IO_REPARSE_TAG_ACTIVISION_HSM == pbuffer->ReparseTag ||
          IO_REPARSE_TAG_PROJFS == pbuffer->ReparseTag) {
        isabsolute = 1;
        substitutename = malloc((len + 1) * sizeof(char));
        if (!substitutename) {
          free_alloca(pbuffer, use_heap_large);
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
        memcpy(substitutename, path, len + 1);
        substitutename_len = len;
      } else {
        /* XXX this might be not the end, restart handling with REPARSE_GUID_DATA_BUFFER should be implemented. */
        free_alloca(pbuffer, use_heap_large);
        free_alloca(tmp, use_heap);
        FREE_PATHW()
        return (size_t)-1;
      }

      if(isabsolute && substitutename_len > 4) {
        /* Do not resolve volumes (for now). A mounted point can
           target a volume without a drive, it is not certain that
           all IO functions we use in php and its deps support
           path with volume GUID instead of the DOS way, like:
           d:\test\mnt\foo
           \\?\Volume{62d1c3f8-83b9-11de-b108-806e6f6e6963}\foo
        */
        if (strncmp(substitutename, "\\??\\Volume{",11) == 0
          || strncmp(substitutename, "\\\\?\\Volume{",11) == 0
          || strncmp(substitutename, "\\??\\UNC\\", 8) == 0
          ) {
          isVolume = TRUE;
          substitutename_off = 0;
        } else
          /* do not use the \??\ and \\?\ prefix*/
          if (strncmp(substitutename, "\\??\\", 4) == 0
            || strncmp(substitutename, "\\\\?\\", 4) == 0) {
          substitutename_off = 4;
        }
      }

      if (!isVolume) {
        char * tmp2 = substitutename + substitutename_off;
        for (bufindex = 0; bufindex + substitutename_off < substitutename_len; bufindex++) {
          *(path + bufindex) = *(tmp2 + bufindex);
        }

        *(path + bufindex) = 0;
        j = bufindex;
      } else {
        j = len;
      }


#if VIRTUAL_CWD_DEBUG
      fprintf(stderr, "reparse: print: %s ", printname);
      fprintf(stderr, "sub: %s ", substitutename);
      fprintf(stderr, "resolved: %s ", path);
      free(printname);
#endif
      free_alloca(pbuffer, use_heap_large);
      free(substitutename);

      if (may_retry_reparse_point) {
        DWORD attrs;

        FREE_PATHW()
        pathw = php_win32_ioutil_any_to_w(path);
        if (!pathw) {
          return (size_t)-1;
        }
        attrs = GetFileAttributesW(pathw);
        if (!isVolume && attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_REPARSE_POINT)) {
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          goto retry_reparse_point;
        }
      }

      if(isabsolute == 1) {
        if (!((j == 3) && (path[1] == ':') && (path[2] == '\\'))) {
          /* use_realpath is 0 in the call below coz path is absolute*/
          j = tsrm_realpath_r(path, 0, j, ll, t, 0, is_dir, &directory);
          if(j == (size_t)-1) {
            free_alloca(tmp, use_heap);
            FREE_PATHW()
            return (size_t)-1;
          }
        }
      }
      else {
        if(i + j >= MAXPATHLEN - 1) {
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }

        memmove(path+i, path, j+1);
        memcpy(path, tmp, i-1);
        path[i-1] = DEFAULT_SLASH;
        j  = tsrm_realpath_r(path, start, i + j, ll, t, use_realpath, is_dir, &directory);
        if(j == (size_t)-1) {
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
      }
      directory = (dataw.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);

      if(link_is_dir) {
        *link_is_dir = directory;
      }
    }
    else {
      if (save) {
        directory = (dataw.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
        if (is_dir && !directory) {
          /* not a directory */
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
      }
#else
    if (save && php_sys_lstat(path, &st) < 0) {
      if (use_realpath == CWD_REALPATH) {
        /* file not found */
        return (size_t)-1;
      }
      /* continue resolution anyway but don't save result in the cache */
      save = 0;
    }

    tmp = do_alloca(len+1, use_heap);
    memcpy(tmp, path, len+1);

    if (save && S_ISLNK(st.st_mode)) {
      if (++(*ll) > LINK_MAX || (j = (size_t)php_sys_readlink(tmp, path, MAXPATHLEN)) == (size_t)-1) {
        /* too many links or broken symlinks */
        free_alloca(tmp, use_heap);
        return (size_t)-1;
      }
      path[j] = 0;
      if (IS_ABSOLUTE_PATH(path, j)) {
        j = tsrm_realpath_r(path, 1, j, ll, t, use_realpath, is_dir, &directory);
        if (j == (size_t)-1) {
          free_alloca(tmp, use_heap);
          return (size_t)-1;
        }
      } else {
        if (i + j >= MAXPATHLEN-1) {
          free_alloca(tmp, use_heap);
          return (size_t)-1; /* buffer overflow */
        }
        memmove(path+i, path, j+1);
        memcpy(path, tmp, i-1);
        path[i-1] = DEFAULT_SLASH;
        j = tsrm_realpath_r(path, start, i + j, ll, t, use_realpath, is_dir, &directory);
        if (j == (size_t)-1) {
          free_alloca(tmp, use_heap);
          return (size_t)-1;
        }
      }
      if (link_is_dir) {
        *link_is_dir = directory;
      }
    } else {
      if (save) {
        directory = S_ISDIR(st.st_mode);
        if (link_is_dir) {
          *link_is_dir = directory;
        }
        if (is_dir && !directory) {
          /* not a directory */
          free_alloca(tmp, use_heap);
          return (size_t)-1;
        }
      }
#endif
      if (i <= start + 1) {
        j = start;
      } else {
        /* some leading directories may be inaccessible */
        j = tsrm_realpath_r(path, start, i-1, ll, t, save ? CWD_FILEPATH : use_realpath, true,
                NULL);
        if (j > start && j != (size_t)-1) {
          path[j++] = DEFAULT_SLASH;
        }
      }
#ifdef ZEND_WIN32
      if (j == (size_t)-1 || j + len >= MAXPATHLEN - 1 + i) {
        free_alloca(tmp, use_heap);
        FREE_PATHW()
        return (size_t)-1;
      }
      if (save) {
        size_t sz;
        char *tmp_path = php_win32_ioutil_conv_w_to_any(dataw.cFileName, PHP_WIN32_CP_IGNORE_LEN, &sz);
        if (!tmp_path) {
          free_alloca(tmp, use_heap);
          FREE_PATHW()
          return (size_t)-1;
        }
        i = sz;
        memcpy(path+j, tmp_path, i+1);
        free(tmp_path);
        j += i;
      } else {
        /* use the original file or directory name as it wasn't found */
        memcpy(path+j, tmp+i, len-i+1);
        j += (len-i);
      }
    }
#else
      if (j == (size_t)-1 || j + len >= MAXPATHLEN - 1 + i) {
        free_alloca(tmp, use_heap);
        return (size_t)-1;
      }
      memcpy(path+j, tmp+i, len-i+1);
      j += (len-i);
    }
#endif

    if (save && start && CWDG(realpath_cache_size_limit)) {
      /* save absolute path in the cache */
      realpath_cache_add(tmp, len, path, j, directory, *t);
    }

    free_alloca(tmp, use_heap);
#ifdef ZEND_WIN32
    FREE_PATHW()
#undef FREE_PATHW
#endif
    return j;
  }
}
/* }}} */

/* Resolve path relatively to state and put the real path into state */
/* returns 0 for ok, 1 for error, -1 if (path_length >= MAXPATHLEN-1) */
CWD_API int virtual_file_ex(cwd_state *state, const char *path, verify_path_func verify_path, int use_realpath) /* {{{ */
{
  size_t path_length = strlen(path);
  char resolved_path[MAXPATHLEN];
  size_t start = 1;
  int ll = 0;
  time_t t;
  int ret;
  bool add_slash;
  void *tmp;

  if (!path_length || path_length >= MAXPATHLEN-1) {
#ifdef ZEND_WIN32
    SET_ERRNO_FROM_WIN32_CODE(ERROR_INVALID_PARAMETER);
#else
    errno = EINVAL;
#endif
    return 1;
  }

#if VIRTUAL_CWD_DEBUG
  fprintf(stderr,"cwd = %s path = %s\n", state->cwd, path);
#endif

#ifdef ZEND_WIN32
  switch (php_win32_ioutil_path_kind_a(path, path_length)) {
    case PHP_WIN32_IOUTIL_PATH_RESERVED:
      SET_ERRNO_FROM_WIN32_CODE(ERROR_INVALID_NAME);
      return 1;
    case PHP_WIN32_IOUTIL_PATH_DEVICE:
      memcpy(resolved_path, path, path_length + 1);
      goto verify;
    default:
      break;
  }
#endif

  /* cwd_length can be 0 when getcwd() fails.
   * This can happen under solaris when a dir does not have read permissions
   * but *does* have execute permissions */
  if (!IS_ABSOLUTE_PATH(path, path_length)) {
    if (state->cwd_length == 0) {
      /* resolve relative path */
      start = 0;
      memcpy(resolved_path , path, path_length + 1);
    } else {
      size_t state_cwd_length = state->cwd_length;

#ifdef ZEND_WIN32
      if (IS_SLASH(path[0])) {
        if (state->cwd[1] == ':') {
          /* Copy only the drive name */
          state_cwd_length = 2;
        } else if (IS_UNC_PATH(state->cwd, state->cwd_length)) {
          /* Copy only the share name */
          state_cwd_length = 2;
          while (IS_SLASH(state->cwd[state_cwd_length])) {
            state_cwd_length++;
          }
          while (state->cwd[state_cwd_length] &&
              !IS_SLASH(state->cwd[state_cwd_length])) {
            state_cwd_length++;
          }
          while (IS_SLASH(state->cwd[state_cwd_length])) {
            state_cwd_length++;
          }
          while (state->cwd[state_cwd_length] &&
              !IS_SLASH(state->cwd[state_cwd_length])) {
            state_cwd_length++;
          }
        }
      }
#endif
      if (path_length + state_cwd_length + 1 >= MAXPATHLEN-1) {
#ifdef ZEND_WIN32
        SET_ERRNO_FROM_WIN32_CODE(ERROR_BUFFER_OVERFLOW);
#else
        errno = ENAMETOOLONG;
#endif
        return 1;
      }
      memcpy(resolved_path, state->cwd, state_cwd_length);
      if (resolved_path[state_cwd_length-1] == DEFAULT_SLASH) {
        memcpy(resolved_path + state_cwd_length, path, path_length + 1);
        path_length += state_cwd_length;
      } else {
        resolved_path[state_cwd_length] = DEFAULT_SLASH;
        memcpy(resolved_path + state_cwd_length + 1, path, path_length + 1);
        path_length += state_cwd_length + 1;
      }
    }
  } else {
#ifdef ZEND_WIN32
    if (path_length > 2 && path[1] == ':' && !IS_SLASH(path[2])) {
      resolved_path[0] = path[0];
      resolved_path[1] = ':';
      resolved_path[2] = DEFAULT_SLASH;
      memcpy(resolved_path + 3, path + 2, path_length - 1);
      path_length++;
    } else
#endif
    memcpy(resolved_path, path, path_length + 1);
  }

#ifdef ZEND_WIN32
  if (memchr(resolved_path, '*', path_length) ||
    memchr(resolved_path, '?', path_length)) {
    SET_ERRNO_FROM_WIN32_CODE(ERROR_INVALID_NAME);
    return 1;
  }
#endif

#ifdef ZEND_WIN32
  if (IS_UNC_PATH(resolved_path, path_length)) {
    /* skip UNC name */
    resolved_path[0] = DEFAULT_SLASH;
    resolved_path[1] = DEFAULT_SLASH;
    start = 2;
    while (!IS_SLASH(resolved_path[start])) {
      if (resolved_path[start] == 0) {
        goto verify;
      }
      resolved_path[start] = toupper((unsigned char)resolved_path[start]);
      start++;
    }
    resolved_path[start++] = DEFAULT_SLASH;
    while (!IS_SLASH(resolved_path[start])) {
      if (resolved_path[start] == 0) {
        goto verify;
      }
      resolved_path[start] = toupper((unsigned char)resolved_path[start]);
      start++;
    }
    resolved_path[start++] = DEFAULT_SLASH;
  } else if (IS_ABSOLUTE_PATH(resolved_path, path_length)) {
    /* skip DRIVE name */
    resolved_path[0] = toupper((unsigned char)resolved_path[0]);
    resolved_path[2] = DEFAULT_SLASH;
    if (path_length == 2) {
      resolved_path[3] = '\0';
    }
    start = 3;
  }
#endif

  add_slash = (use_realpath != CWD_REALPATH) && path_length > 0 && IS_SLASH(resolved_path[path_length-1]);
  t = CWDG(realpath_cache_ttl) ? 0 : -1;
  path_length = tsrm_realpath_r(resolved_path, start, path_length, &ll, &t, use_realpath, false, NULL);

  if (path_length == (size_t)-1) {
#ifdef ZEND_WIN32
    if (errno != EACCES) {
      errno = ENOENT;
    }
#else
    errno = ENOENT;
#endif
    return 1;
  }

  if (!start && !path_length) {
    resolved_path[path_length++] = '.';
  }

  if (add_slash && path_length && !IS_SLASH(resolved_path[path_length-1])) {
    if (path_length >= MAXPATHLEN-1) {
      return -1;
    }
    resolved_path[path_length++] = DEFAULT_SLASH;
  }
  resolved_path[path_length] = 0;

#ifdef ZEND_WIN32
verify:
#endif
  if (verify_path) {
    cwd_state old_state;

    CWD_STATE_COPY(&old_state, state);
    state->cwd_length = path_length;

    tmp = erealloc(state->cwd, state->cwd_length+1);
    state->cwd = (char *) tmp;

    memcpy(state->cwd, resolved_path, state->cwd_length+1);
    if (verify_path(state)) {
      CWD_STATE_FREE(state);
      *state = old_state;
      ret = 1;
    } else {
      CWD_STATE_FREE(&old_state);
      ret = 0;
    }
  } else {
    state->cwd_length = path_length;
    tmp = erealloc(state->cwd, state->cwd_length+1);
    state->cwd = (char *) tmp;

    memcpy(state->cwd, resolved_path, state->cwd_length+1);
    ret = 0;
  }

#if VIRTUAL_CWD_DEBUG
  fprintf (stderr, "virtual_file_ex() = %s\n",state->cwd);
#endif
  return (ret);
}
/* }}} */

CWD_API zend_result virtual_chdir(const char *path) /* {{{ */
{
  return virtual_file_ex(&CWDG(cwd), path, php_is_dir_ok, CWD_REALPATH) ? FAILURE : SUCCESS;
}
/* }}} */


/* returns 0 for ok, 1 for empty string, -1 on error */
CWD_API int virtual_chdir_file(const char *path, int (*p_chdir)(const char *path)) /* {{{ */
{
  size_t length = strlen(path);
  char *temp;
  int retval;
  ALLOCA_FLAG(use_heap)

  if (length == 0) {
    return 1; /* Can't cd to empty string */
  }
  while(--length < SIZE_MAX && !IS_SLASH(path[length])) {
  }

  if (length == SIZE_MAX) {
    /* No directory only file name */
    errno = ENOENT;
    return -1;
  }

  if (length == COPY_WHEN_ABSOLUTE(path) && IS_ABSOLUTE_PATH(path, length+1)) { /* Also use trailing slash if this is absolute */
    length++;
  }
  temp = (char *) do_alloca(length+1, use_heap);
  memcpy(temp, path, length);
  temp[length] = 0;
#if VIRTUAL_CWD_DEBUG
  fprintf (stderr, "Changing directory to %s\n", temp);
#endif
  retval = p_chdir(temp);
  free_alloca(temp, use_heap);
  return retval;
}
/* }}} */

CWD_API char *virtual_realpath(const char *path, char *real_path) /* {{{ */
{
  cwd_state new_state;
  char *retval;
  char cwd[MAXPATHLEN];

  /* realpath("") returns CWD */
  if (!*path) {
    new_state.cwd = (char*)emalloc(1);
    new_state.cwd[0] = '\0';
    new_state.cwd_length = 0;
    if (VCWD_GETCWD(cwd, MAXPATHLEN)) {
      path = cwd;
    }
  } else if (!IS_ABSOLUTE_PATH(path, strlen(path))) {
    CWD_STATE_COPY(&new_state, &CWDG(cwd));
  } else {
    new_state.cwd = (char*)emalloc(1);
    new_state.cwd[0] = '\0';
    new_state.cwd_length = 0;
  }

  if (virtual_file_ex(&new_state, path, NULL, CWD_REALPATH)==0) {
    size_t len = new_state.cwd_length>MAXPATHLEN-1?MAXPATHLEN-1:new_state.cwd_length;

    memcpy(real_path, new_state.cwd, len);
    real_path[len] = '\0';
    retval = real_path;
  } else {
    retval = NULL;
  }

  CWD_STATE_FREE(&new_state);
  return retval;
}
/* }}} */

/* returns 0 for ok, 1 for error, -1 if (path_length >= MAXPATHLEN-1) */
CWD_API int virtual_filepath_ex(const char *path, char **filepath, verify_path_func verify_path) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  retval = virtual_file_ex(&new_state, path, verify_path, CWD_FILEPATH);

  *filepath = new_state.cwd;

  return retval;

}
/* }}} */

/* returns 0 for ok, 1 for error, -1 if (path_length >= MAXPATHLEN-1) */
CWD_API int virtual_filepath(const char *path, char **filepath) /* {{{ */
{
  return virtual_filepath_ex(path, filepath, php_is_file_ok);
}
/* }}} */

CWD_API FILE *virtual_fopen(const char *path, const char *mode) /* {{{ */
{
  cwd_state new_state;
  FILE *f;

  if (path[0] == '\0') { /* Fail to open empty path */
    return NULL;
  }

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&new_state);
    return NULL;
  }

#ifdef ZEND_WIN32
  f = php_win32_ioutil_fopen(new_state.cwd, mode);
#else
  f = fopen(new_state.cwd, mode);
#endif

  CWD_STATE_FREE_ERR(&new_state);

  return f;
}
/* }}} */

CWD_API int virtual_access(const char *pathname, int mode) /* {{{ */
{
  cwd_state new_state;
  int ret;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, pathname, NULL, CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#if defined(ZEND_WIN32)
  ret = tsrm_win32_access(new_state.cwd, mode);
#else
  ret = access(new_state.cwd, mode);
#endif

  CWD_STATE_FREE_ERR(&new_state);

  return ret;
}
/* }}} */

#ifdef HAVE_UTIME
CWD_API int virtual_utime(const char *filename, struct utimbuf *buf) /* {{{ */
{
  cwd_state new_state;
  int ret;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, filename, NULL, CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#ifdef ZEND_WIN32
  ret = win32_utime(new_state.cwd, buf);
#else
  ret = utime(new_state.cwd, buf);
#endif

  CWD_STATE_FREE_ERR(&new_state);
  return ret;
}
/* }}} */
#endif

CWD_API int virtual_chmod(const char *filename, mode_t mode) /* {{{ */
{
  cwd_state new_state;
  int ret;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, filename, NULL, CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#ifdef ZEND_WIN32
  {
    mode_t _tmp = mode;

    mode = 0;

    if (_tmp & _S_IREAD) {
      mode |= _S_IREAD;
    }
    if (_tmp & _S_IWRITE) {
      mode |= _S_IWRITE;
    }
    ret = php_win32_ioutil_chmod(new_state.cwd, mode);
  }
#else
  ret = chmod(new_state.cwd, mode);
#endif

  CWD_STATE_FREE_ERR(&new_state);
  return ret;
}
/* }}} */

#if !defined(ZEND_WIN32)
CWD_API int virtual_chown(const char *filename, uid_t owner, gid_t group, int link) /* {{{ */
{
  cwd_state new_state;
  int ret;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, filename, NULL, link ? CWD_EXPAND : CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

  if (link) {
#ifdef HAVE_LCHOWN
    ret = lchown(new_state.cwd, owner, group);
#else
    ret = -1;
#endif
  } else {
    ret = chown(new_state.cwd, owner, group);
  }

  CWD_STATE_FREE_ERR(&new_state);
  return ret;
}
/* }}} */
#endif

CWD_API int virtual_open(const char *path, int flags, ...) /* {{{ */
{
  cwd_state new_state;
  int f;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_FILEPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

  if (flags & O_CREAT) {
    mode_t mode;
    va_list arg;

    va_start(arg, flags);
    mode = (mode_t) va_arg(arg, int);
    va_end(arg);

#ifdef ZEND_WIN32
    f = php_win32_ioutil_open(new_state.cwd, flags, mode);
#else
    f = open(new_state.cwd, flags, mode);
#endif
  } else {
#ifdef ZEND_WIN32
    f = php_win32_ioutil_open(new_state.cwd, flags);
#else
    f = open(new_state.cwd, flags);
#endif
  }
  CWD_STATE_FREE_ERR(&new_state);
  return f;
}
/* }}} */

CWD_API int virtual_creat(const char *path, mode_t mode) /* {{{ */
{
  cwd_state new_state;
  int f;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_FILEPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

  f = creat(new_state.cwd,  mode);

  CWD_STATE_FREE_ERR(&new_state);
  return f;
}
/* }}} */

CWD_API int virtual_rename(const char *oldname, const char *newname) /* {{{ */
{
  cwd_state old_state;
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&old_state, &CWDG(cwd));
  if (virtual_file_ex(&old_state, oldname, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&old_state);
    return -1;
  }
  oldname = old_state.cwd;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, newname, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&old_state);
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }
  newname = new_state.cwd;

  /* rename on windows will fail if newname already exists.
     MoveFileEx has to be used */
#ifdef ZEND_WIN32
  /* MoveFileEx returns 0 on failure, other way 'round for this function */
  retval = php_win32_ioutil_rename(oldname, newname);
#else
  retval = rename(oldname, newname);
#endif

  CWD_STATE_FREE_ERR(&old_state);
  CWD_STATE_FREE_ERR(&new_state);

  return retval;
}
/* }}} */

CWD_API int virtual_stat(const char *path, zend_stat_t *buf) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

  retval = php_sys_stat(new_state.cwd, buf);

  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

CWD_API int virtual_lstat(const char *path, zend_stat_t *buf) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

  retval = php_sys_lstat(new_state.cwd, buf);

  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

CWD_API int virtual_unlink(const char *path) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, path, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#ifdef ZEND_WIN32
  retval = php_win32_ioutil_unlink(new_state.cwd);
#else
  retval = unlink(new_state.cwd);
#endif

  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

CWD_API int virtual_mkdir(const char *pathname, mode_t mode) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, pathname, NULL, CWD_FILEPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#ifdef ZEND_WIN32
  retval = php_win32_ioutil_mkdir(new_state.cwd, mode);
#else
  retval = mkdir(new_state.cwd, mode);
#endif
  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

CWD_API int virtual_rmdir(const char *pathname) /* {{{ */
{
  cwd_state new_state;
  int retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, pathname, NULL, CWD_EXPAND)) {
    CWD_STATE_FREE_ERR(&new_state);
    return -1;
  }

#ifdef ZEND_WIN32
  retval = php_win32_ioutil_rmdir(new_state.cwd);
#else
  retval = rmdir(new_state.cwd);
#endif
  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

#ifdef ZEND_WIN32
DIR *opendir(const char *name);
#endif

CWD_API DIR *virtual_opendir(const char *pathname) /* {{{ */
{
  cwd_state new_state;
  DIR *retval;

  CWD_STATE_COPY(&new_state, &CWDG(cwd));
  if (virtual_file_ex(&new_state, pathname, NULL, CWD_REALPATH)) {
    CWD_STATE_FREE_ERR(&new_state);
    return NULL;
  }

  retval = opendir(new_state.cwd);

  CWD_STATE_FREE_ERR(&new_state);
  return retval;
}
/* }}} */

#ifdef ZEND_WIN32
CWD_API FILE *virtual_popen(const char *command, const char *type) /* {{{ */
{
  return popen_ex(command, type, CWDG(cwd).cwd, NULL);
}
/* }}} */
#else /* Unix */
CWD_API FILE *virtual_popen(const char *command, const char *type) /* {{{ */
{
  size_t command_length;
  int dir_length, extra = 0;
  char *command_line;
  char *ptr, *dir;
  FILE *retval;

  command_length = strlen(command);

  dir_length = CWDG(cwd).cwd_length;
  dir = CWDG(cwd).cwd;
  while (dir_length > 0) {
    if (*dir == '\'') extra+=3;
    dir++;
    dir_length--;
  }
  dir_length = CWDG(cwd).cwd_length;
  dir = CWDG(cwd).cwd;

  ptr = command_line = (char *) emalloc(command_length + sizeof("cd '' ; ") + dir_length + extra+1+1);
  ptr = zend_mempcpy(ptr, "cd ", sizeof("cd ") - 1);

  if (CWDG(cwd).cwd_length == 0) {
    *ptr++ = DEFAULT_SLASH;
  } else {
    *ptr++ = '\'';
    while (dir_length > 0) {
      switch (*dir) {
      case '\'':
        *ptr++ = '\'';
        *ptr++ = '\\';
        *ptr++ = '\'';
        ZEND_FALLTHROUGH;
      default:
        *ptr++ = *dir;
      }
      dir++;
      dir_length--;
    }
    *ptr++ = '\'';
  }

  *ptr++ = ' ';
  *ptr++ = ';';
  *ptr++ = ' ';

  memcpy(ptr, command, command_length+1);
  retval = popen(command_line, type);

  efree(command_line);
  return retval;
}
/* }}} */
#endif

CWD_API char *tsrm_realpath(const char *path, char *real_path) /* {{{ */
{
  cwd_state new_state;
  char cwd[MAXPATHLEN];

  /* realpath("") returns CWD */
  if (!*path) {
    new_state.cwd = (char*)emalloc(1);
    new_state.cwd[0] = '\0';
    new_state.cwd_length = 0;
    if (VCWD_GETCWD(cwd, MAXPATHLEN)) {
      path = cwd;
    }
  } else if (!IS_ABSOLUTE_PATH(path, strlen(path)) &&
          VCWD_GETCWD(cwd, MAXPATHLEN)) {
    new_state.cwd = estrdup(cwd);
    new_state.cwd_length = strlen(cwd);
  } else {
    new_state.cwd = (char*)emalloc(1);
    new_state.cwd[0] = '\0';
    new_state.cwd_length = 0;
  }

  if (virtual_file_ex(&new_state, path, NULL, CWD_REALPATH)) {
    efree(new_state.cwd);
    return NULL;
  }

  if (real_path) {
    size_t copy_len = new_state.cwd_length>MAXPATHLEN-1 ? MAXPATHLEN-1 : new_state.cwd_length;
    memcpy(real_path, new_state.cwd, copy_len);
    real_path[copy_len] = '\0';
    efree(new_state.cwd);
    return real_path;
  } else {
    return new_state.cwd;
  }
}
/* }}} */

Coverage Report

Created: 2026-10-28 06:20