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dirent.h
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dirent.h
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/*
* 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
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wunused-function"
#elif defined(_MSC_VER)
# pragma warning(disable:4505) // error C4505: '_wreaddir': unreferenced local function has been removed
#else
# pragma GCC diagnostic ignored "-Wunused-function"
#endif // _MSC_VER
/*
* 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 <windows.h>
#include <stdio.h>
#include <stdarg.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
/* 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
/* Link */
#if !defined(S_IFLNK)
# define S_IFLNK 0
#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
/* 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
/* 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
/* 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, sockets and links cannot be
* distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK 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;
/* File position within 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;
/* 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;
/* File position within 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 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);
/* For compatibility with Symbian */
#define wdirent _wdirent
#define WDIR _WDIR
#define wopendir _wopendir
#define wreaddir _wreaddir
#define wclosedir _wclosedir
#define wrewinddir _wrewinddir
/* Internal utility functions */
static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);
static int dirent_mbstowcs_s(
size_t *pReturnValue,
wchar_t *wcstr,
size_t sizeInWords,
const char *mbstr,
size_t count);
static int dirent_wcstombs_s(
size_t *pReturnValue,
char *mbstr,
size_t sizeInBytes,
const wchar_t *wcstr,
size_t count);
static void dirent_set_errno (int error);
/*
* 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)
{
_WDIR *dirp = NULL;
DWORD n;
wchar_t *p;
/* Must have directory name */
if (dirname == NULL || dirname[0] == '\0') {
dirent_set_errno (ENOENT);
return NULL;
}
/* Allocate new _WDIR structure */
dirp = (_WDIR*) malloc (sizeof (struct _WDIR));
if (!dirp) {
return NULL;
}
/* Reset _WDIR structure */
dirp->handle = INVALID_HANDLE_VALUE;
dirp->patt = NULL;
dirp->cached = 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 defined(WINAPI_FAMILY) && defined(WINAPI_FAMILY_PHONE_APP) && (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
/* WinRT */
n = wcslen (dirname);
#else
/* Regular Windows */
n = GetFullPathNameW (dirname, 0, NULL, NULL);
#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 defined(WINAPI_FAMILY) && defined(WINAPI_FAMILY_PHONE_APP) && (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
/* WinRT */
wcsncpy_s (dirp->patt, n+1, dirname, n);
#else
/* Regular Windows */
n = GetFullPathNameW (dirname, n, dirp->patt, NULL);
if (n <= 0) {
goto exit_closedir;
}
#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)
{
struct _wdirent *entry;
/*
* Read directory entry to buffer. We can safely ignore the return value
* as entry will be set to NULL in case of error.
*/
(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)
{
WIN32_FIND_DATAW *datap;
/* Read next directory entry */
datap = dirent_next (dirp);
if (datap) {
size_t n;
DWORD attr;
/*
* 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.
*/
n = 0;
while (n < PATH_MAX && datap->cFileName[n] != 0) {
entry->d_name[n] = datap->cFileName[n];
n++;
}
entry->d_name[n] = 0;
/* Length of file name excluding zero terminator */
entry->d_namlen = n;
/* File type */
attr = datap->dwFileAttributes;
if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
entry->d_type = DT_CHR;
} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
entry->d_type = DT_DIR;
} else {
entry->d_type = DT_REG;
}
/* Reset dummy fields */
entry->d_ino = 0;
entry->d_off = 0;
entry->d_reclen = sizeof (struct _wdirent);
/* Set result address */
*result = entry;
} else {
/* Return NULL to indicate end of directory */
*result = NULL;
}
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)
{
int ok;
if (dirp) {
/* Release search handle */
if (dirp->handle != INVALID_HANDLE_VALUE) {
FindClose (dirp->handle);
}
/* Release search pattern */
free (dirp->patt);
/* Release directory structure */
free (dirp);
ok = /*success*/0;
} else {
/* Invalid directory stream */
dirent_set_errno (EBADF);
ok = /*failure*/-1;
}
return ok;
}
/*
* Rewind directory stream such that _wreaddir() returns the very first
* file name again.
*/
static void
_wrewinddir(
_WDIR* dirp)
{
if (dirp) {
/* Release existing search handle */
if (dirp->handle != INVALID_HANDLE_VALUE) {
FindClose (dirp->handle);
}
/* Open new search handle */
dirent_first (dirp);
}
}
/* Get first directory entry (internal) */
static WIN32_FIND_DATAW*
dirent_first(
_WDIR *dirp)
{
WIN32_FIND_DATAW *datap;
DWORD error;
/* Open directory and retrieve the first entry */
dirp->handle = FindFirstFileExW(
dirp->patt, FindExInfoStandard, &dirp->data,
FindExSearchNameMatch, NULL, 0);
if (dirp->handle != INVALID_HANDLE_VALUE) {
/* a directory entry is now waiting in memory */
datap = &dirp->data;
dirp->cached = 1;
} else {
/* Failed to open directory: no directory entry in memory */
dirp->cached = 0;
datap = NULL;
/* Set error code */
error = GetLastError ();
switch (error) {
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 datap;
}
/*
* Get next directory entry (internal).
*
* Returns
*/
static WIN32_FIND_DATAW*
dirent_next(
_WDIR *dirp)
{
WIN32_FIND_DATAW *p;
/* Get next directory entry */
if (dirp->cached != 0) {
/* A valid directory entry already in memory */
p = &dirp->data;
dirp->cached = 0;
} else if (dirp->handle != INVALID_HANDLE_VALUE) {
/* Get the next directory entry from stream */
if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {
/* Got a file */
p = &dirp->data;
} else {
/* The very last entry has been processed or an error occurred */
FindClose (dirp->handle);
dirp->handle = INVALID_HANDLE_VALUE;
p = NULL;
}
} else {
/* End of directory stream reached */
p = NULL;
}
return p;
}
/*
* Open directory stream using plain old C-string.
*/
static DIR*
opendir(
const char *dirname)
{
struct DIR *dirp;
int error;
wchar_t wname[PATH_MAX + 1];
size_t n;
/* Must have directory name */
if (dirname == NULL || dirname[0] == '\0') {
dirent_set_errno (ENOENT);
return NULL;
}
/* Allocate memory for DIR structure */
dirp = (DIR*) malloc (sizeof (struct DIR));
if (!dirp) {
return NULL;
}
/* Convert directory name to wide-character string */
error = dirent_mbstowcs_s(
&n, wname, PATH_MAX + 1, dirname, PATH_MAX + 1);
if (error) {
/*
* Cannot convert file name to wide-character string. This
* occurs if the string contains invalid multi-byte sequences or
* the output buffer is too small to contain the resulting
* string.
*/
goto exit_free;
}
/* Open directory stream using wide-character name */
dirp->wdirp = _wopendir (wname);
if (!dirp->wdirp) {
goto exit_free;
}
/* Success */
return dirp;
/* Failure */
exit_free:
free (dirp);
return NULL;
}
/*
* Read next directory entry.
*/
static struct dirent*
readdir(
DIR *dirp)
{
struct dirent *entry;
/*
* Read directory entry to buffer. We can safely ignore the return value
* as entry will be set to NULL in case of error.
*/
(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)
{
WIN32_FIND_DATAW *datap;
/* Read next directory entry */
datap = dirent_next (dirp->wdirp);
if (datap) {
size_t n;
int error;
/* Attempt to convert file name to multi-byte string */
error = dirent_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 traditional
* Unix-code to access some file names despite of unicode
* characters, 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 = dirent_wcstombs_s(
&n, entry->d_name, PATH_MAX + 1,
datap->cAlternateFileName, PATH_MAX + 1);
}
if (!error) {
DWORD attr;
/* Length of file name excluding zero terminator */
entry->d_namlen = n - 1;
/* File attributes */
attr = datap->dwFileAttributes;
if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
entry->d_type = DT_CHR;
} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
entry->d_type = DT_DIR;
} else {
entry->d_type = DT_REG;
}
/* Reset dummy fields */
entry->d_ino = 0;
entry->d_off = 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;
} else {
/* No more directory entries */
*result = NULL;
}
return /*OK*/0;
}
/*
* Close directory stream.
*/
static int
closedir(
DIR *dirp)
{
int ok;
if (dirp) {
/* Close wide-character directory stream */
ok = _wclosedir (dirp->wdirp);
dirp->wdirp = NULL;
/* Release multi-byte character version */
free (dirp);
} else {
/* Invalid directory stream */
dirent_set_errno (EBADF);
ok = /*failure*/-1;
}
return ok;
}
/*
* Rewind directory stream to beginning.
*/
static void
rewinddir(
DIR* dirp)
{
/* Rewind wide-character string directory stream */
_wrewinddir (dirp->wdirp);
}
/*
* 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**))
{
struct dirent **files = NULL;
size_t size = 0;
size_t allocated = 0;
const size_t init_size = 1;
DIR *dir = NULL;
struct dirent *entry;
struct dirent *tmp = NULL;
size_t i;
int result = 0;
/* Open directory stream */
dir = opendir (dirname);
if (dir) {
/* Read directory entries to memory */
while (1) {
/* Enlarge pointer table to make room for another pointer */
if (size >= allocated) {
void *p;
size_t num_entries;
/* Compute number of entries in the enlarged pointer table */
if (size < init_size) {
/* Allocate initial pointer table */
num_entries = init_size;
} else {
/* Double the size */
num_entries = size * 2;
}
/* Allocate first pointer table or enlarge existing table */
p = realloc (files, sizeof (void*) * num_entries);
if (p != NULL) {
/* Got the memory */
files = (dirent**) p;
allocated = num_entries;
} else {
/* Out of memory */
result = -1;
break;
}
}
/* Allocate room for temporary directory entry */
if (tmp == NULL) {
tmp = (struct dirent*) malloc (sizeof (struct dirent));
if (tmp == NULL) {
/* Cannot allocate temporary directory entry */
result = -1;
break;
}
}
/* Read directory entry to temporary area */
if (readdir_r (dir, tmp, &entry) == /*OK*/0) {
/* Did we get an entry? */
if (entry != NULL) {
int pass;
/* Determine whether to include the entry in result */
if (filter) {
/* Let the filter function decide */
pass = filter (tmp);
} else {
/* No filter function, include everything */
pass = 1;
}
if (pass) {
/* Store the temporary entry to pointer table */
files[size++] = tmp;
tmp = NULL;
/* Keep up with the number of files */
result++;
}
} else {
/*
* End of directory stream reached => sort entries and
* exit.
*/
qsort (files, size, sizeof (void*),
(int (*) (const void*, const void*)) compare);
break;
}
} else {
/* Error reading directory entry */
result = /*Error*/ -1;
break;
}
}
} else {
/* Cannot open directory */
result = /*Error*/ -1;
}
/* Release temporary directory entry */
free (tmp);
/* Release allocated memory on error */
if (result < 0) {
for (i = 0; i < size; i++) {
free (files[i]);
}
free (files);
files = NULL;
}