php-src/Zend/zend_virtual_cwd.c

/*
   +----------------------------------------------------------------------+
   | PHP Version 7                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2018 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | 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
#endif

#ifndef HAVE_REALPATH
#define realpath(x,y) strcpy(y,x)
#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;
#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

#ifdef ZEND_WIN32

#ifdef CTL_CODE
#undef CTL_CODE
#endif
#define CTL_CODE(DeviceType,Function,Method,Access) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method))
#define FILE_DEVICE_FILE_SYSTEM 0x00000009
#define METHOD_BUFFERED		0
#define FILE_ANY_ACCESS 	0
#define FSCTL_GET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define MAXIMUM_REPARSE_DATA_BUFFER_SIZE  ( 16 * 1024 )

typedef struct {
	unsigned long  ReparseTag;
	unsigned short ReparseDataLength;
	unsigned short Reserved;
	union {
		struct {
			unsigned short SubstituteNameOffset;
			unsigned short SubstituteNameLength;
			unsigned short PrintNameOffset;
			unsigned short PrintNameLength;
			unsigned long  Flags;
			wchar_t        ReparseTarget[1];
		} SymbolicLinkReparseBuffer;
		struct {
			unsigned short SubstituteNameOffset;
			unsigned short SubstituteNameLength;
			unsigned short PrintNameOffset;
			unsigned short PrintNameLength;
			wchar_t        ReparseTarget[1];
		} MountPointReparseBuffer;
		struct {
			unsigned char  ReparseTarget[1];
		} GenericReparseBuffer;
	};
} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;

#define SECS_BETWEEN_EPOCHS (__int64)11644473600
#define SECS_TO_100NS (__int64)10000000
static inline time_t FileTimeToUnixTime(const FILETIME *FileTime)
{
	__int64 UnixTime;
	SYSTEMTIME SystemTime;
	FileTimeToSystemTime(FileTime, &SystemTime);

	UnixTime = ((__int64)FileTime->dwHighDateTime << 32) +
	FileTime->dwLowDateTime;

	UnixTime -= (SECS_BETWEEN_EPOCHS * SECS_TO_100NS);

	UnixTime /= SECS_TO_100NS; /* now convert to seconds */

	if ((time_t)UnixTime != UnixTime) {
		UnixTime = 0;
	}
	return (time_t)UnixTime;
}

CWD_API ssize_t php_sys_readlink(const char *link, char *target, size_t target_len){ /* {{{ */
	HANDLE hFile;
	wchar_t *linkw = php_win32_ioutil_any_to_w(link), targetw[MAXPATHLEN];
	size_t ret_len, targetw_len, offset = 0;
	char *ret;

	if (!linkw) {
		return -1;
	}

	if (!target_len) {
		free(linkw);
		return -1;
	}

	hFile = CreateFileW(linkw,            // file to open
				 0,  // query possible attributes
				 PHP_WIN32_IOUTIL_DEFAULT_SHARE_MODE,
				 NULL,                  // default security
				 OPEN_EXISTING,         // existing file only
				 FILE_FLAG_BACKUP_SEMANTICS, // normal file
				 NULL);                 // no attr. template
	if( hFile == INVALID_HANDLE_VALUE) {
		free(linkw);
		return -1;
	}

	/* Despite MSDN has documented it won't to, the length returned by
		GetFinalPathNameByHandleA includes the length of the
		null terminator. This behavior is at least reproducible
		with VS2012 and earlier, and seems not to be fixed till
		now. Thus, correcting target_len so it's suddenly don't
		overflown. */
	targetw_len = GetFinalPathNameByHandleW(hFile, targetw, MAXPATHLEN, VOLUME_NAME_DOS);
	if(targetw_len >= target_len || targetw_len >= MAXPATHLEN || targetw_len == 0) {
		free(linkw);
		CloseHandle(hFile);
		return -1;
	}

	if(targetw_len > 4) {
		/* Skip first 4 characters if they are "\\?\" */
		if(targetw[0] == L'\\' && targetw[1] == L'\\' && targetw[2] == L'?' && targetw[3] ==  L'\\') {
			offset = 4;

			/* \\?\UNC\ */
			if (targetw_len > 7 && targetw[4] == L'U' && targetw[5] == L'N' && targetw[6] == L'C') {
				offset += 2;
				targetw[offset] = L'\\';
			}
		}
	}

	ret = php_win32_ioutil_conv_w_to_any(targetw + offset, targetw_len - offset, &ret_len);
	if (!ret || ret_len >= MAXPATHLEN) {
		CloseHandle(hFile);
		free(linkw);
		free(ret);
		return -1;
	}
	memcpy(target, ret, ret_len + 1);

	free(ret);
	CloseHandle(hFile);
	free(linkw);

	return (ssize_t)ret_len;
}
/* }}} */

CWD_API int php_sys_stat_ex(const char *path, zend_stat_t *buf, int lstat) /* {{{ */
{
	WIN32_FILE_ATTRIBUTE_DATA data;
	LARGE_INTEGER t;
	size_t pathw_len = 0;
	ALLOCA_FLAG(use_heap_large)
	wchar_t *pathw = php_win32_ioutil_conv_any_to_w(path, PHP_WIN32_CP_IGNORE_LEN, &pathw_len);

	if (!pathw) {
		return -1;
	}

	if (!GetFileAttributesExW(pathw, GetFileExInfoStandard, &data)) {
		int ret;
#if ZEND_ENABLE_ZVAL_LONG64
		ret = _wstat64(pathw, buf);
#else
		ret = _wstat(pathw, (struct _stat32 *)buf);
#endif
		free(pathw);

		return ret;
	}

	if (pathw_len >= 1 && pathw[1] == L':') {
		if (pathw[0] >= L'A' && pathw[0] <= L'Z') {
			buf->st_dev = buf->st_rdev = pathw[0] - L'A';
		} else {
			buf->st_dev = buf->st_rdev = pathw[0] - L'a';
		}
	} else if (PHP_WIN32_IOUTIL_IS_UNC(pathw, pathw_len)) {
		buf->st_dev = buf->st_rdev = 0;
	} else {
		wchar_t cur_path[MAXPATHLEN+1];

		if (NULL != _wgetcwd(cur_path, sizeof(cur_path)/sizeof(wchar_t))) {
			if (cur_path[1] == L':') {
				if (pathw[0] >= L'A' && pathw[0] <= L'Z') {
					buf->st_dev = buf->st_rdev = pathw[0] - L'A';
				} else {
					buf->st_dev = buf->st_rdev = pathw[0] - L'a';
				}
			} else {
				buf->st_dev = buf->st_rdev = -1;
			}
		} else {
			buf->st_dev = buf->st_rdev = -1;
		}
	}

	buf->st_uid = buf->st_gid = buf->st_ino = 0;

	if (lstat && data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
		/* File is a reparse point. Get the target */
		HANDLE hLink = NULL;
		REPARSE_DATA_BUFFER * pbuffer;
		DWORD retlength = 0;

		hLink = CreateFileW(pathw,
				FILE_READ_ATTRIBUTES,
				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(pathw);
			return -1;
		}

		pbuffer = (REPARSE_DATA_BUFFER *)do_alloca(MAXIMUM_REPARSE_DATA_BUFFER_SIZE, use_heap_large);
		if(!DeviceIoControl(hLink, FSCTL_GET_REPARSE_POINT, NULL, 0, pbuffer,  MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &retlength, NULL)) {
			free_alloca(pbuffer, use_heap_large);
			CloseHandle(hLink);
			free(pathw);
			return -1;
		}

		CloseHandle(hLink);

		if(pbuffer->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
			buf->st_mode = S_IFLNK;
			buf->st_mode |= (data.dwFileAttributes & FILE_ATTRIBUTE_READONLY) ? (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)) : (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)|S_IWRITE|(S_IWRITE>>3)|(S_IWRITE>>6));
		}

#if 0 /* Not used yet */
		else if(pbuffer->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
			buf->st_mode |=;
		}
#endif
		free_alloca(pbuffer, use_heap_large);
	} else {
		buf->st_mode = (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? (S_IFDIR|S_IEXEC|(S_IEXEC>>3)|(S_IEXEC>>6)) : S_IFREG;
		buf->st_mode |= (data.dwFileAttributes & FILE_ATTRIBUTE_READONLY) ? (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)) : (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)|S_IWRITE|(S_IWRITE>>3)|(S_IWRITE>>6));
	}

	if ((data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0) {
		if (pathw_len >= 4 && pathw[pathw_len-4] == L'.') {
			if (_wcsnicmp(pathw+pathw_len-3, L"exe", 3) == 0 ||
				_wcsnicmp(pathw+pathw_len-3, L"com", 3) == 0 ||
				_wcsnicmp(pathw+pathw_len-3, L"bat", 3) == 0 ||
				_wcsnicmp(pathw+pathw_len-3, L"cmd", 3) == 0) {
				buf->st_mode  |= (S_IEXEC|(S_IEXEC>>3)|(S_IEXEC>>6));
			}
		}
	}

	buf->st_nlink = 1;
	t.HighPart = data.nFileSizeHigh;
	t.LowPart = data.nFileSizeLow;
	/* It's an overflow on 32 bit, however it won't fix as long
	as zend_long is 32 bit. */
	buf->st_size = (zend_long)t.QuadPart;
	buf->st_atime = FileTimeToUnixTime(&data.ftLastAccessTime);
	buf->st_ctime = FileTimeToUnixTime(&data.ftCreationTime);
	buf->st_mtime = FileTimeToUnixTime(&data.ftLastWriteTime);

	free(pathw);

	return 0;
}
/* }}} */
#endif

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

	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;

	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 cwd_globals_dtor(virtual_cwd_globals *cwd_g) /* {{{ */
{
	realpath_cache_clean();
}
/* }}} */

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(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_id(&cwd_globals_id, 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 int virtual_cwd_activate(void) /* {{{ */
{
	if (CWDG(cwd).cwd == NULL) {
		CWD_STATE_COPY(&CWDG(cwd), &main_cwd_state);
	}
	return 0;
}
/* }}} */

CWD_API int virtual_cwd_deactivate(void) /* {{{ */
{
	if (CWDG(cwd).cwd != NULL) {
		CWD_STATE_FREE(&CWDG(cwd));
		CWDG(cwd).cwd = NULL;
	}
	return 0;
}
/* }}} */

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(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) /* {{{ */
{
	register zend_ulong h;
	size_t bucket_key_len;
	char *bucket_key_start = tsrm_win32_get_path_sid_key(path, path_len, &bucket_key_len);
	char *bucket_key = (char *)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) /* {{{ */
{
	register 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) /* {{{ */
{
	uint32_t i;

	for (i = 0; i < sizeof(CWDG(realpath_cache))/sizeof(CWDG(realpath_cache)[0]); i++) {
		realpath_cache_bucket *p = CWDG(realpath_cache)[i];
		while (p != NULL) {
			realpath_cache_bucket *r = p;
			p = p->next;
			free(r);
		}
		CWDG(realpath_cache)[i] = NULL;
	}
	CWDG(realpath_cache_size) = 0;
}
/* }}} */

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, int 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;
#define FREE_PATHW() \
	do { free(pathw); } while(0);

#else
	zend_stat_t st;
#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 = 1;
			continue;
		} else if (i + 2 == len && path[i] == '.' && path[i+1] == '.') {
			/* remove '..' and previous directory */
			is_dir = 1;
			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, 1, 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
		if (save) {
			pathw = php_win32_ioutil_any_to_w(path);
			if (!pathw) {
				return (size_t)-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:
		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;
			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 = (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;
				}
				free_alloca(tmp, use_heap);
				CloseHandle(hLink);
				FREE_PATHW()
				return (size_t)-1;
			}

			CloseHandle(hLink);

			if(pbuffer->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
				reparsetarget = pbuffer->SymbolicLinkReparseBuffer.ReparseTarget;
				isabsolute = (pbuffer->SymbolicLinkReparseBuffer.Flags == 0) ? 1 : 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;
				}
				memmove(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;
				}
				memmove(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(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 unaccessable */
				j = tsrm_realpath_r(path, start, i-1, ll, t, save ? CWD_FILEPATH : use_realpath, 1, 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 */
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] = {0};
	size_t start = 1;
	int ll = 0;
	time_t t;
	int ret;
	int add_slash;
	void *tmp;

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

#if VIRTUAL_CWD_DEBUG
	fprintf(stderr,"cwd = %s path = %s\n", state->cwd, path);
#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) {
				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)) {
		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(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(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(resolved_path[0]);
		resolved_path[2] = DEFAULT_SLASH;
		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, 0, NULL);

	if (path_length == (size_t)-1) {
		errno = ENOENT;
		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 int virtual_chdir(const char *path) /* {{{ */
{
	return virtual_file_ex(&CWDG(cwd), path, php_is_dir_ok, CWD_REALPATH)?-1:0;
}
/* }}} */

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;
}
/* }}} */

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;

}
/* }}} */

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;
}
/* }}} */

#if 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, CWD_REALPATH)) {
		CWD_STATE_FREE_ERR(&new_state);
		return -1;
	}

	if (link) {
#if 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);
	memcpy(ptr, "cd ", sizeof("cd ")-1);
	ptr += sizeof("cd ")-1;

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

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */