/* * Dirent interface for Microsoft Visual Studio * * Copyright (C) 1998-2019 Toni Ronkko * This file is part of dirent. Dirent may be freely distributed * under the MIT license. For all details and documentation, see * https://github.com/tronkko/dirent */ #ifndef DIRENT_H #define DIRENT_H /* Hide warnings about unreferenced local functions */ #if defined(__clang__) # pragma clang diagnostic ignored "-Wunused-function" #elif defined(_MSC_VER) # pragma warning(disable:4505) #elif defined(__GNUC__) # pragma GCC diagnostic ignored "-Wunused-function" #endif /* * Include windows.h without Windows Sockets 1.1 to prevent conflicts with * Windows Sockets 2.0. */ #ifndef WIN32_LEAN_AND_MEAN # define WIN32_LEAN_AND_MEAN #endif #include #include #include #include #include #include #include #include #include #include #include /* Indicates that d_type field is available in dirent structure */ #define _DIRENT_HAVE_D_TYPE /* Indicates that d_namlen field is available in dirent structure */ #define _DIRENT_HAVE_D_NAMLEN /* Entries missing from MSVC 6.0 */ #if !defined(FILE_ATTRIBUTE_DEVICE) # define FILE_ATTRIBUTE_DEVICE 0x40 #endif /* File type and permission flags for stat(), general mask */ #if !defined(S_IFMT) # define S_IFMT _S_IFMT #endif /* Directory bit */ #if !defined(S_IFDIR) # define S_IFDIR _S_IFDIR #endif /* Character device bit */ #if !defined(S_IFCHR) # define S_IFCHR _S_IFCHR #endif /* Pipe bit */ #if !defined(S_IFFIFO) # define S_IFFIFO _S_IFFIFO #endif /* Regular file bit */ #if !defined(S_IFREG) # define S_IFREG _S_IFREG #endif /* Read permission */ #if !defined(S_IREAD) # define S_IREAD _S_IREAD #endif /* Write permission */ #if !defined(S_IWRITE) # define S_IWRITE _S_IWRITE #endif /* Execute permission */ #if !defined(S_IEXEC) # define S_IEXEC _S_IEXEC #endif /* Pipe */ #if !defined(S_IFIFO) # define S_IFIFO _S_IFIFO #endif /* Block device */ #if !defined(S_IFBLK) # define S_IFBLK 0 #endif /* * Symbolic link. Be ware that S_IFLNK value and S_ISLNK() macro are only * usable with dirent - they do not work with stat() function call! */ #if !defined(S_IFLNK) # define S_IFLNK (_S_IFDIR | _S_IFREG) #endif /* Socket */ #if !defined(S_IFSOCK) # define S_IFSOCK 0 #endif /* Read user permission */ #if !defined(S_IRUSR) # define S_IRUSR S_IREAD #endif /* Write user permission */ #if !defined(S_IWUSR) # define S_IWUSR S_IWRITE #endif /* Execute user permission */ #if !defined(S_IXUSR) # define S_IXUSR 0 #endif /* User full permissions */ #if !defined(S_IRWXU) # define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR) #endif /* Read group permission */ #if !defined(S_IRGRP) # define S_IRGRP 0 #endif /* Write group permission */ #if !defined(S_IWGRP) # define S_IWGRP 0 #endif /* Execute group permission */ #if !defined(S_IXGRP) # define S_IXGRP 0 #endif /* Group full permissions */ #if !defined(S_IRWXG) # define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP) #endif /* Read others permission */ #if !defined(S_IROTH) # define S_IROTH 0 #endif /* Write others permission */ #if !defined(S_IWOTH) # define S_IWOTH 0 #endif /* Execute others permission */ #if !defined(S_IXOTH) # define S_IXOTH 0 #endif /* Other full permissions */ #if !defined(S_IRWXO) # define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH) #endif /* Maximum length of file name */ #if !defined(PATH_MAX) # define PATH_MAX MAX_PATH #endif #if !defined(FILENAME_MAX) # define FILENAME_MAX MAX_PATH #endif #if !defined(NAME_MAX) # define NAME_MAX FILENAME_MAX #endif /* File type flags for d_type */ #define DT_UNKNOWN 0 #define DT_REG S_IFREG #define DT_DIR S_IFDIR #define DT_FIFO S_IFIFO #define DT_SOCK S_IFSOCK #define DT_CHR S_IFCHR #define DT_BLK S_IFBLK #define DT_LNK S_IFLNK /* Macros for converting between st_mode and d_type */ #define IFTODT(mode) ((mode) & S_IFMT) #define DTTOIF(type) (type) /* * File type macros. Note that block devices and sockets cannot be * distinguished on Windows, and the macros S_ISBLK and S_ISSOCK are only * defined for compatibility. These macros should always return false on * Windows. */ #if !defined(S_ISFIFO) # define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO) #endif #if !defined(S_ISDIR) # define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) #endif #if !defined(S_ISREG) # define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG) #endif #if !defined(S_ISLNK) # define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK) #endif #if !defined(S_ISSOCK) # define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK) #endif #if !defined(S_ISCHR) # define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR) #endif #if !defined(S_ISBLK) # define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK) #endif /* Return the exact length of the file name without zero terminator */ #define _D_EXACT_NAMLEN(p) ((p)->d_namlen) /* Return the maximum size of a file name */ #define _D_ALLOC_NAMLEN(p) ((PATH_MAX)+1) #ifdef __cplusplus extern "C" { #endif /* Wide-character version */ struct _wdirent { /* Always zero */ long d_ino; /* Position of next file in a directory stream */ long d_off; /* Structure size */ unsigned short d_reclen; /* Length of name without \0 */ size_t d_namlen; /* File type */ int d_type; /* File name */ wchar_t d_name[PATH_MAX+1]; }; typedef struct _wdirent _wdirent; struct _WDIR { /* Current directory entry */ struct _wdirent ent; /* Private file data */ WIN32_FIND_DATAW data; /* True if data is valid */ int cached; /* True if next entry is invalid */ int invalid; /* Win32 search handle */ HANDLE handle; /* Initial directory name */ wchar_t *patt; }; typedef struct _WDIR _WDIR; /* Multi-byte character version */ struct dirent { /* Always zero */ long d_ino; /* Position of next file in a directory stream */ long d_off; /* Structure size */ unsigned short d_reclen; /* Length of name without \0 */ size_t d_namlen; /* File type */ int d_type; /* File name */ char d_name[PATH_MAX+1]; }; typedef struct dirent dirent; struct DIR { struct dirent ent; struct _WDIR *wdirp; }; typedef struct DIR DIR; /* Dirent functions */ static DIR *opendir(const char *dirname); static _WDIR *_wopendir(const wchar_t *dirname); static struct dirent *readdir(DIR *dirp); static struct _wdirent *_wreaddir(_WDIR *dirp); static int readdir_r( DIR *dirp, struct dirent *entry, struct dirent **result); static int _wreaddir_r( _WDIR *dirp, struct _wdirent *entry, struct _wdirent **result); static int closedir(DIR *dirp); static int _wclosedir(_WDIR *dirp); static void rewinddir(DIR *dirp); static void _wrewinddir(_WDIR *dirp); static long telldir(DIR *dirp); static long _wtelldir(_WDIR *dirp); static void seekdir(DIR *dirp, long loc); static void _wseekdir(_WDIR *dirp, long loc); static int scandir(const char *dirname, struct dirent ***namelist, int (*filter)(const struct dirent*), int (*compare)(const struct dirent**, const struct dirent**)); static int alphasort(const struct dirent **a, const struct dirent **b); static int versionsort(const struct dirent **a, const struct dirent **b); static int strverscmp(const char *a, const char *b); /* For compatibility with Symbian */ #define wdirent _wdirent #define WDIR _WDIR #define wopendir _wopendir #define wreaddir _wreaddir #define wclosedir _wclosedir #define wrewinddir _wrewinddir #define wtelldir _wtelldir #define wseekdir _wseekdir /* Compatibility with older Microsoft compilers and non-Microsoft compilers */ #if !defined(_MSC_VER) || _MSC_VER < 1400 # define wcstombs_s dirent_wcstombs_s # define mbstowcs_s dirent_mbstowcs_s #endif /* Optimize dirent_set_errno() away on modern Microsoft compilers */ #if defined(_MSC_VER) && _MSC_VER >= 1400 # define dirent_set_errno _set_errno #endif /* Internal utility functions */ static WIN32_FIND_DATAW *dirent_first(_WDIR *dirp); static WIN32_FIND_DATAW *dirent_next(_WDIR *dirp); static long dirent_hash(WIN32_FIND_DATAW *datap); #if !defined(_MSC_VER) || _MSC_VER < 1400 static int dirent_mbstowcs_s( size_t *pReturnValue, wchar_t *wcstr, size_t sizeInWords, const char *mbstr, size_t count); #endif #if !defined(_MSC_VER) || _MSC_VER < 1400 static int dirent_wcstombs_s( size_t *pReturnValue, char *mbstr, size_t sizeInBytes, const wchar_t *wcstr, size_t count); #endif #if !defined(_MSC_VER) || _MSC_VER < 1400 static void dirent_set_errno(int error); #endif /* * Open directory stream DIRNAME for read and return a pointer to the * internal working area that is used to retrieve individual directory * entries. */ static _WDIR * _wopendir(const wchar_t *dirname) { wchar_t *p; /* Must have directory name */ if (dirname == NULL || dirname[0] == '\0') { dirent_set_errno(ENOENT); return NULL; } /* Allocate new _WDIR structure */ _WDIR *dirp = (_WDIR*) malloc(sizeof(struct _WDIR)); if (!dirp) return NULL; /* Reset _WDIR structure */ dirp->handle = INVALID_HANDLE_VALUE; dirp->patt = NULL; dirp->cached = 0; dirp->invalid = 0; /* * Compute the length of full path plus zero terminator * * Note that on WinRT there's no way to convert relative paths * into absolute paths, so just assume it is an absolute path. */ #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) /* Desktop */ DWORD n = GetFullPathNameW(dirname, 0, NULL, NULL); #else /* WinRT */ size_t n = wcslen(dirname); #endif /* Allocate room for absolute directory name and search pattern */ dirp->patt = (wchar_t*) malloc(sizeof(wchar_t) * n + 16); if (dirp->patt == NULL) goto exit_closedir; /* * Convert relative directory name to an absolute one. This * allows rewinddir() to function correctly even when current * working directory is changed between opendir() and rewinddir(). * * Note that on WinRT there's no way to convert relative paths * into absolute paths, so just assume it is an absolute path. */ #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) /* Desktop */ n = GetFullPathNameW(dirname, n, dirp->patt, NULL); if (n <= 0) goto exit_closedir; #else /* WinRT */ wcsncpy_s(dirp->patt, n+1, dirname, n); #endif /* Append search pattern \* to the directory name */ p = dirp->patt + n; switch (p[-1]) { case '\\': case '/': case ':': /* Directory ends in path separator, e.g. c:\temp\ */ /*NOP*/; break; default: /* Directory name doesn't end in path separator */ *p++ = '\\'; } *p++ = '*'; *p = '\0'; /* Open directory stream and retrieve the first entry */ if (!dirent_first(dirp)) goto exit_closedir; /* Success */ return dirp; /* Failure */ exit_closedir: _wclosedir(dirp); return NULL; } /* * Read next directory entry. * * Returns pointer to static directory entry which may be overwritten by * subsequent calls to _wreaddir(). */ static struct _wdirent * _wreaddir(_WDIR *dirp) { /* * Read directory entry to buffer. We can safely ignore the return * value as entry will be set to NULL in case of error. */ struct _wdirent *entry; (void) _wreaddir_r(dirp, &dirp->ent, &entry); /* Return pointer to statically allocated directory entry */ return entry; } /* * Read next directory entry. * * Returns zero on success. If end of directory stream is reached, then sets * result to NULL and returns zero. */ static int _wreaddir_r( _WDIR *dirp, struct _wdirent *entry, struct _wdirent **result) { /* Validate directory handle */ if (!dirp || dirp->handle == INVALID_HANDLE_VALUE || !dirp->patt) { dirent_set_errno(EBADF); *result = NULL; return -1; } /* Read next directory entry */ WIN32_FIND_DATAW *datap = dirent_next(dirp); if (!datap) { /* Return NULL to indicate end of directory */ *result = NULL; return /*OK*/0; } /* * Copy file name as wide-character string. If the file name is too * long to fit in to the destination buffer, then truncate file name * to PATH_MAX characters and zero-terminate the buffer. */ size_t i = 0; while (i < PATH_MAX && datap->cFileName[i] != 0) { entry->d_name[i] = datap->cFileName[i]; i++; } entry->d_name[i] = 0; /* Length of file name excluding zero terminator */ entry->d_namlen = i; /* Determine file type */ DWORD attr = datap->dwFileAttributes; if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) entry->d_type = DT_CHR; else if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) != 0) entry->d_type = DT_LNK; else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) entry->d_type = DT_DIR; else entry->d_type = DT_REG; /* Read the next directory entry to cache */ datap = dirent_next(dirp); if (datap) { /* Compute 31-bit hash of the next directory entry */ entry->d_off = dirent_hash(datap); /* Push the next directory entry back to cache */ dirp->cached = 1; } else { /* End of directory stream */ entry->d_off = (long) ((~0UL) >> 1); } /* Reset other fields */ entry->d_ino = 0; entry->d_reclen = sizeof(struct _wdirent); /* Set result address */ *result = entry; return /*OK*/0; } /* * Close directory stream opened by opendir() function. This invalidates the * DIR structure as well as any directory entry read previously by * _wreaddir(). */ static int _wclosedir(_WDIR *dirp) { if (!dirp) { dirent_set_errno(EBADF); return /*failure*/-1; } /* * Release search handle if we have one. Being able to handle * partially initialized _WDIR structure allows us to use this * function to handle errors occurring within _wopendir. */ if (dirp->handle != INVALID_HANDLE_VALUE) { FindClose(dirp->handle); } /* * Release search pattern. Note that we don't need to care if * dirp->patt is NULL or not: function free is guaranteed to act * appropriately. */ free(dirp->patt); /* Release directory structure */ free(dirp); return /*success*/0; } /* * Rewind directory stream such that _wreaddir() returns the very first * file name again. */ static void _wrewinddir(_WDIR* dirp) { /* Check directory pointer */ if (!dirp || dirp->handle == INVALID_HANDLE_VALUE || !dirp->patt) return; /* Release existing search handle */ FindClose(dirp->handle); /* Open new search handle */ dirent_first(dirp); } /* Get first directory entry */ static WIN32_FIND_DATAW * dirent_first(_WDIR *dirp) { /* Open directory and retrieve the first entry */ dirp->handle = FindFirstFileExW( dirp->patt, FindExInfoStandard, &dirp->data, FindExSearchNameMatch, NULL, 0); if (dirp->handle == INVALID_HANDLE_VALUE) goto error; /* A directory entry is now waiting in memory */ dirp->cached = 1; return &dirp->data; error: /* Failed to open directory: no directory entry in memory */ dirp->cached = 0; dirp->invalid = 1; /* Set error code */ DWORD errorcode = GetLastError(); switch (errorcode) { case ERROR_ACCESS_DENIED: /* No read access to directory */ dirent_set_errno(EACCES); break; case ERROR_DIRECTORY: /* Directory name is invalid */ dirent_set_errno(ENOTDIR); break; case ERROR_PATH_NOT_FOUND: default: /* Cannot find the file */ dirent_set_errno(ENOENT); } return NULL; } /* Get next directory entry */ static WIN32_FIND_DATAW * dirent_next(_WDIR *dirp) { /* Return NULL if seek position was invalid */ if (dirp->invalid) return NULL; /* Is the next directory entry already in cache? */ if (dirp->cached) { /* Yes, a valid directory entry found in memory */ dirp->cached = 0; return &dirp->data; } /* Read the next directory entry from stream */ if (FindNextFileW(dirp->handle, &dirp->data) == FALSE) { /* End of directory stream */ return NULL; } /* Success */ return &dirp->data; } /* * Compute 31-bit hash of file name. * * See djb2 at http://www.cse.yorku.ca/~oz/hash.html */ static long dirent_hash(WIN32_FIND_DATAW *datap) { unsigned long hash = 5381; unsigned long c; const wchar_t *p = datap->cFileName; const wchar_t *e = p + MAX_PATH; while (p != e && (c = *p++) != 0) { hash = (hash << 5) + hash + c; } return (long) (hash & ((~0UL) >> 1)); } /* Open directory stream using plain old C-string */ static DIR *opendir(const char *dirname) { /* Must have directory name */ if (dirname == NULL || dirname[0] == '\0') { dirent_set_errno(ENOENT); return NULL; } /* Allocate memory for DIR structure */ struct DIR *dirp = (DIR*) malloc(sizeof(struct DIR)); if (!dirp) return NULL; /* Convert directory name to wide-character string */ wchar_t wname[PATH_MAX + 1]; size_t n; int error = mbstowcs_s(&n, wname, PATH_MAX + 1, dirname, PATH_MAX+1); if (error) goto exit_failure; /* Open directory stream using wide-character name */ dirp->wdirp = _wopendir(wname); if (!dirp->wdirp) goto exit_failure; /* Success */ return dirp; /* Failure */ exit_failure: free(dirp); return NULL; } /* Read next directory entry */ static struct dirent * readdir(DIR *dirp) { /* * Read directory entry to buffer. We can safely ignore the return * value as entry will be set to NULL in case of error. */ struct dirent *entry; (void) readdir_r(dirp, &dirp->ent, &entry); /* Return pointer to statically allocated directory entry */ return entry; } /* * Read next directory entry into called-allocated buffer. * * Returns zero on success. If the end of directory stream is reached, then * sets result to NULL and returns zero. */ static int readdir_r( DIR *dirp, struct dirent *entry, struct dirent **result) { /* Read next directory entry */ WIN32_FIND_DATAW *datap = dirent_next(dirp->wdirp); if (!datap) { /* No more directory entries */ *result = NULL; return /*OK*/0; } /* Attempt to convert file name to multi-byte string */ size_t n; int error = wcstombs_s( &n, entry->d_name, PATH_MAX + 1, datap->cFileName, PATH_MAX + 1); /* * If the file name cannot be represented by a multi-byte string, then * attempt to use old 8+3 file name. This allows the program to * access files although file names may seem unfamiliar to the user. * * Be ware that the code below cannot come up with a short file name * unless the file system provides one. At least VirtualBox shared * folders fail to do this. */ if (error && datap->cAlternateFileName[0] != '\0') { error = wcstombs_s( &n, entry->d_name, PATH_MAX + 1, datap->cAlternateFileName, PATH_MAX + 1); } if (!error) { /* Length of file name excluding zero terminator */ entry->d_namlen = n - 1; /* Determine file type */ DWORD attr = datap->dwFileAttributes; if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) entry->d_type = DT_CHR; else if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) != 0) entry->d_type = DT_LNK; else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) entry->d_type = DT_DIR; else entry->d_type = DT_REG; /* Get offset of next file */ datap = dirent_next(dirp->wdirp); if (datap) { /* Compute 31-bit hash of the next directory entry */ entry->d_off = dirent_hash(datap); /* Push the next directory entry back to cache */ dirp->wdirp->cached = 1; } else { /* End of directory stream */ entry->d_off = (long) ((~0UL) >> 1); } /* Reset fields */ entry->d_ino = 0; entry->d_reclen = sizeof(struct dirent); } else { /* * Cannot convert file name to multi-byte string so construct * an erroneous directory entry and return that. Note that * we cannot return NULL as that would stop the processing * of directory entries completely. */ entry->d_name[0] = '?'; entry->d_name[1] = '\0'; entry->d_namlen = 1; entry->d_type = DT_UNKNOWN; entry->d_ino = 0; entry->d_off = -1; entry->d_reclen = 0; } /* Return pointer to directory entry */ *result = entry; return /*OK*/0; } /* Close directory stream */ static int closedir(DIR *dirp) { int ok; if (!dirp) goto exit_failure; /* Close wide-character directory stream */ ok = _wclosedir(dirp->wdirp); dirp->wdirp = NULL; /* Release multi-byte character version */ free(dirp); return ok; exit_failure: /* Invalid directory stream */ dirent_set_errno(EBADF); return /*failure*/-1; } /* Rewind directory stream to beginning */ static void rewinddir(DIR *dirp) { if (!dirp) return; /* Rewind wide-character string directory stream */ _wrewinddir(dirp->wdirp); } /* Get position of directory stream */ static long _wtelldir(_WDIR *dirp) { if (!dirp || dirp->handle == INVALID_HANDLE_VALUE) { dirent_set_errno(EBADF); return /*failure*/-1; } /* Read next file entry */ WIN32_FIND_DATAW *datap = dirent_next(dirp); if (!datap) { /* End of directory stream */ return (long) ((~0UL) >> 1); } /* Store file entry to cache for readdir() */ dirp->cached = 1; /* Return the 31-bit hash code to be used as stream position */ return dirent_hash(datap); } /* Get position of directory stream */ static long telldir(DIR *dirp) { if (!dirp) { dirent_set_errno(EBADF); return -1; } return _wtelldir(dirp->wdirp); } /* Seek directory stream to offset */ static void _wseekdir(_WDIR *dirp, long loc) { if (!dirp) return; /* Directory must be open */ if (dirp->handle == INVALID_HANDLE_VALUE) goto exit_failure; /* Ensure that seek position is valid */ if (loc < 0) goto exit_failure; /* Restart directory stream from the beginning */ FindClose(dirp->handle); if (!dirent_first(dirp)) goto exit_failure; /* Reset invalid flag so that we can read from the stream again */ dirp->invalid = 0; /* * Read directory entries from the beginning until the hash matches a * file name. Be ware that hash code is only 31 bits longs and * duplicates are possible: the hash code cannot return the position * with 100.00% accuracy! Moreover, the method is slow for large * directories. */ long hash; do { /* Read next directory entry */ WIN32_FIND_DATAW *datap = dirent_next(dirp); if (!datap) { /* * End of directory stream was reached before finding * the requested location. Perhaps the file in * question was deleted or moved out of the directory. */ goto exit_failure; } /* Does the file name match the hash? */ hash = dirent_hash(datap); } while (hash != loc); /* * File name matches the hash! Push the directory entry back to cache * from where next readdir() will return it. */ dirp->cached = 1; dirp->invalid = 0; return; exit_failure: /* Ensure that readdir will return NULL */ dirp->invalid = 1; } /* Seek directory stream to offset */ static void seekdir(DIR *dirp, long loc) { if (!dirp) return; _wseekdir(dirp->wdirp, loc); } /* Scan directory for entries */ static int scandir( const char *dirname, struct dirent ***namelist, int (*filter)(const struct dirent*), int (*compare)(const struct dirent**, const struct dirent**)) { int result; /* Open directory stream */ DIR *dir = opendir(dirname); if (!dir) { /* Cannot open directory */ return /*Error*/ -1; } /* Read directory entries to memory */ struct dirent *tmp = NULL; struct dirent **files = NULL; size_t size = 0; size_t allocated = 0; while (1) { /* Allocate room for a temporary directory entry */ if (!tmp) { tmp = (struct dirent*) malloc(sizeof(struct dirent)); if (!tmp) goto exit_failure; } /* Read directory entry to temporary area */ struct dirent *entry; if (readdir_r(dir, tmp, &entry) != /*OK*/0) goto exit_failure; /* Stop if we already read the last directory entry */ if (entry == NULL) goto exit_success; /* Determine whether to include the entry in results */ if (filter && !filter(tmp)) continue; /* Enlarge pointer table to make room for another pointer */ if (size >= allocated) { /* Compute number of entries in the new table */ size_t num_entries = size * 2 + 16; /* Allocate new pointer table or enlarge existing */ void *p = realloc(files, sizeof(void*) * num_entries); if (!p) goto exit_failure; /* Got the memory */ files = (dirent**) p; allocated = num_entries; } /* Store the temporary entry to ptr table */ files[size++] = tmp; tmp = NULL; } exit_failure: /* Release allocated entries */ for (size_t i = 0; i < size; i++) { free(files[i]); } /* Release the pointer table */ free(files); files = NULL; /* Exit with error code */ result = /*error*/ -1; goto exit_status; exit_success: /* Sort directory entries */ if (size > 1 && compare) { qsort(files, size, sizeof(void*), (int (*) (const void*, const void*)) compare); } /* Pass pointer table to caller */ if (namelist) *namelist = files; /* Return the number of directory entries read */ result = (int) size; exit_status: /* Release temporary directory entry, if we had one */ free(tmp); /* Close directory stream */ closedir(dir); return result; } /* Alphabetical sorting */ static int alphasort(const struct dirent **a, const struct dirent **b) { return strcoll((*a)->d_name, (*b)->d_name); } /* Sort versions */ static int versionsort(const struct dirent **a, const struct dirent **b) { return strverscmp((*a)->d_name, (*b)->d_name); } /* Compare strings */ static int strverscmp(const char *a, const char *b) { size_t i = 0; size_t j; /* Find first difference */ while (a[i] == b[i]) { if (a[i] == '\0') { /* No difference */ return 0; } ++i; } /* Count backwards and find the leftmost digit */ j = i; while (j > 0 && isdigit(a[j-1])) { --j; } /* Determine mode of comparison */ if (a[j] == '0' || b[j] == '0') { /* Find the next non-zero digit */ while (a[j] == '0' && a[j] == b[j]) { j++; } /* String with more digits is smaller, e.g 002 < 01 */ if (isdigit(a[j])) { if (!isdigit(b[j])) { return -1; } } else if (isdigit(b[j])) { return 1; } } else if (isdigit(a[j]) && isdigit(b[j])) { /* Numeric comparison */ size_t k1 = j; size_t k2 = j; /* Compute number of digits in each string */ while (isdigit(a[k1])) { k1++; } while (isdigit(b[k2])) { k2++; } /* Number with more digits is bigger, e.g 999 < 1000 */ if (k1 < k2) return -1; else if (k1 > k2) return 1; } /* Alphabetical comparison */ return (int) ((unsigned char) a[i]) - ((unsigned char) b[i]); } /* Convert multi-byte string to wide character string */ #if !defined(_MSC_VER) || _MSC_VER < 1400 static int dirent_mbstowcs_s( size_t *pReturnValue, wchar_t *wcstr, size_t sizeInWords, const char *mbstr, size_t count) { /* Older Visual Studio or non-Microsoft compiler */ size_t n = mbstowcs(wcstr, mbstr, sizeInWords); if (wcstr && n >= count) return /*error*/ 1; /* Zero-terminate output buffer */ if (wcstr && sizeInWords) { if (n >= sizeInWords) n = sizeInWords - 1; wcstr[n] = 0; } /* Length of multi-byte string with zero terminator */ if (pReturnValue) { *pReturnValue = n + 1; } /* Success */ return 0; } #endif /* Convert wide-character string to multi-byte string */ #if !defined(_MSC_VER) || _MSC_VER < 1400 static int dirent_wcstombs_s( size_t *pReturnValue, char *mbstr, size_t sizeInBytes, const wchar_t *wcstr, size_t count) { /* Older Visual Studio or non-Microsoft compiler */ size_t n = wcstombs(mbstr, wcstr, sizeInBytes); if (mbstr && n >= count) return /*error*/1; /* Zero-terminate output buffer */ if (mbstr && sizeInBytes) { if (n >= sizeInBytes) { n = sizeInBytes - 1; } mbstr[n] = '\0'; } /* Length of resulting multi-bytes string WITH zero-terminator */ if (pReturnValue) { *pReturnValue = n + 1; } /* Success */ return 0; } #endif /* Set errno variable */ #if !defined(_MSC_VER) || _MSC_VER < 1400 static void dirent_set_errno(int error) { /* Non-Microsoft compiler or older Microsoft compiler */ errno = error; } #endif #ifdef __cplusplus } #endif #endif /*DIRENT_H*/