612 lines
15 KiB
C
612 lines
15 KiB
C
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/*
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* dirent.h - dirent API for Microsoft Visual Studio
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*
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* Copyright (C) 2006-2012 Toni Ronkko
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* ``Software''), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* $Id: dirent.h,v 1.20 2014/03/19 17:52:23 tronkko Exp $
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*/
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#ifndef DIRENT_MSVC_H
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#define DIRENT_MSVC_H
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#include <windows.h>
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#if _MSC_VER >= 1900
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#include <../ucrt/stdio.h>
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#include <../ucrt/wchar.h>
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#include <../ucrt/string.h>
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#include <../ucrt/stdlib.h>
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#include <../ucrt/sys/types.h>
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#include <../ucrt/errno.h>
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#else
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#include <../include/stdio.h>
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#include <../include/wchar.h>
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#include <../include/string.h>
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#include <../include/stdlib.h>
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#include <../include/sys/types.h>
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#include <../include/errno.h>
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#endif
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#include <stdarg.h>
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#include <sys/stat.h>
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/* Indicates that d_type field is available in dirent structure */
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#define _DIRENT_HAVE_D_TYPE
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/* Indicates that d_namlen field is available in dirent structure */
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#define _DIRENT_HAVE_D_NAMLEN
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/* Maximum length of file name */
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#if !defined(PATH_MAX)
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# define PATH_MAX MAX_PATH
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#endif
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#if !defined(FILENAME_MAX)
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# define FILENAME_MAX MAX_PATH
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#endif
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#if !defined(NAME_MAX)
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# define NAME_MAX FILENAME_MAX
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#endif
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/* Return the exact length of d_namlen without zero terminator */
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#define _D_EXACT_NAMLEN(p)((p)->d_namlen)
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/* Return number of bytes needed to store d_namlen */
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#define _D_ALLOC_NAMLEN(p)(PATH_MAX)
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/* Wide-character version */
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struct _wdirent {
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long d_ino; /* Always zero */
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unsigned short d_reclen; /* Structure size */
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size_t d_namlen; /* Length of name without \0 */
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int d_type; /* File type */
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wchar_t d_name[PATH_MAX]; /* File name */
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};
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typedef struct _wdirent _wdirent;
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struct _WDIR {
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struct _wdirent ent; /* Current directory entry */
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WIN32_FIND_DATAW data; /* Private file data */
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int cached; /* True if data is valid */
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HANDLE handle; /* Win32 search handle */
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wchar_t *patt; /* Initial directory name */
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};
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typedef struct _WDIR _WDIR;
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static _WDIR *_wopendir(const wchar_t *dirname);
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static struct _wdirent *_wreaddir(_WDIR *dirp);
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static int _wclosedir(_WDIR *dirp);
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static void _wrewinddir(_WDIR* dirp);
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/* Multi-byte character versions */
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struct dirent {
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long d_ino; /* Always zero */
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unsigned short d_reclen; /* Structure size */
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size_t d_namlen; /* Length of name without \0 */
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int d_type; /* File type */
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char d_name[PATH_MAX]; /* File name */
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};
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typedef struct dirent dirent;
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struct DIR {
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struct dirent ent;
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struct _WDIR *wdirp;
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};
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typedef struct DIR DIR;
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static DIR *opendir(const char *dirname);
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static struct dirent *readdir(DIR *dirp);
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static int closedir(DIR *dirp);
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static void rewinddir(DIR* dirp);
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/* Internal utility functions */
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static WIN32_FIND_DATAW *dirent_first(_WDIR *dirp);
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static WIN32_FIND_DATAW *dirent_next(_WDIR *dirp);
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static int dirent_mbstowcs_s(
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size_t *pReturnValue,
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wchar_t *wcstr,
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size_t sizeInWords,
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const char *mbstr,
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size_t count);
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static int dirent_wcstombs_s(
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size_t *pReturnValue,
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char *mbstr,
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size_t sizeInBytes,
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const wchar_t *wcstr,
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size_t count);
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/*
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* Open directory stream DIRNAME for read and return a pointer to the
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* internal working area that is used to retrieve individual directory
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* entries.
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*/
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static _WDIR*
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_wopendir(const wchar_t *dirname)
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{
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_WDIR *dirp = NULL;
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int error;
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/* Must have directory name */
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if (dirname == NULL || dirname[0] == '\0') {
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_set_errno(ENOENT);
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return NULL;
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}
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/* Allocate new _WDIR structure */
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dirp =(_WDIR*) malloc(sizeof(struct _WDIR));
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if (dirp != NULL) {
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DWORD n;
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/* Reset _WDIR structure */
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dirp->handle = INVALID_HANDLE_VALUE;
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dirp->patt = NULL;
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dirp->cached = 0;
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/* Compute the length of full path plus zero terminator */
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n = GetFullPathNameW(dirname, 0, NULL, NULL);
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/* Allocate room for absolute directory name and search pattern */
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dirp->patt =(wchar_t*) malloc(sizeof(wchar_t) * n + 16);
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if (dirp->patt) {
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/*
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* Convert relative directory name to an absolute one. This
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* allows rewinddir() to function correctly even when current
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* working directory is changed between opendir() and rewinddir().
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*/
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n = GetFullPathNameW(dirname, n, dirp->patt, NULL);
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if (n > 0) {
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wchar_t *p;
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/* Append search pattern \* to the directory name */
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p = dirp->patt + n;
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if (dirp->patt < p) {
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switch(p[-1]) {
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case '\\':
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case '/':
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case ':':
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/* Directory ends in path separator, e.g. c:\temp\ */
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/*NOP*/;
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break;
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default:
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/* Directory name doesn't end in path separator */
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*p++ = '\\';
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}
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}
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*p++ = '*';
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*p = '\0';
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/* Open directory stream and retrieve the first entry */
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if (dirent_first(dirp)) {
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/* Directory stream opened successfully */
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error = 0;
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} else {
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/* Cannot retrieve first entry */
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error = 1;
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_set_errno(ENOENT);
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}
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} else {
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/* Cannot retrieve full path name */
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_set_errno(ENOENT);
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error = 1;
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}
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} else {
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/* Cannot allocate memory for search pattern */
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error = 1;
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}
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} else {
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/* Cannot allocate _WDIR structure */
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error = 1;
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}
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/* Clean up in case of error */
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if (error && dirp) {
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_wclosedir(dirp);
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dirp = NULL;
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}
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return dirp;
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}
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/*
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* Read next directory entry. The directory entry is returned in dirent
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* structure in the d_name field. Individual directory entries returned by
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* this function include regular files, sub-directories, pseudo-directories
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* "." and ".." as well as volume labels, hidden files and system files.
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*/
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static struct _wdirent*
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_wreaddir(_WDIR *dirp)
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{
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WIN32_FIND_DATAW *datap;
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struct _wdirent *entp;
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/* Read next directory entry */
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datap = dirent_next(dirp);
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if (datap) {
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size_t n;
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DWORD attr;
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/* Pointer to directory entry to return */
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entp = &dirp->ent;
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/*
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* Copy file name as wide-character string. If the file name is too
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* long to fit in to the destination buffer, then truncate file name
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* to PATH_MAX characters and zero-terminate the buffer.
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*/
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n = 0;
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while(n + 1 < PATH_MAX && datap->cFileName[n] != 0) {
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entp->d_name[n] = datap->cFileName[n];
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n++;
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}
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dirp->ent.d_name[n] = 0;
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/* Length of file name excluding zero terminator */
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entp->d_namlen = n;
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/* File type */
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attr = datap->dwFileAttributes;
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if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
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entp->d_type = DT_CHR;
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} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
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entp->d_type = DT_DIR;
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} else {
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entp->d_type = DT_REG;
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}
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/* Reset dummy fields */
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entp->d_ino = 0;
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entp->d_reclen = sizeof(struct _wdirent);
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} else {
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/* Last directory entry read */
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entp = NULL;
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}
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return entp;
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}
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/*
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* Close directory stream opened by opendir() function. This invalidates the
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* DIR structure as well as any directory entry read previously by
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* _wreaddir().
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*/
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static int
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_wclosedir(_WDIR *dirp)
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{
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int ok;
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if (dirp) {
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/* Release search handle */
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if (dirp->handle != INVALID_HANDLE_VALUE) {
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FindClose(dirp->handle);
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dirp->handle = INVALID_HANDLE_VALUE;
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}
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/* Release search pattern */
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if (dirp->patt) {
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free(dirp->patt);
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dirp->patt = NULL;
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}
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/* Release directory structure */
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free(dirp);
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ok = /*success*/0;
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} else {
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/* Invalid directory stream */
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_set_errno(EBADF);
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ok = /*failure*/-1;
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}
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return ok;
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}
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/*
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* Rewind directory stream such that _wreaddir() returns the very first
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* file name again.
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*/
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static void
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_wrewinddir(_WDIR* dirp)
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{
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if (dirp) {
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/* Release existing search handle */
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if (dirp->handle != INVALID_HANDLE_VALUE) {
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FindClose(dirp->handle);
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}
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/* Open new search handle */
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dirent_first(dirp);
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}
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}
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/* Get first directory entry(internal) */
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static WIN32_FIND_DATAW*
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dirent_first(_WDIR *dirp)
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{
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WIN32_FIND_DATAW *datap;
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/* Open directory and retrieve the first entry */
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dirp->handle = FindFirstFileW(dirp->patt, &dirp->data);
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if (dirp->handle != INVALID_HANDLE_VALUE) {
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/* a directory entry is now waiting in memory */
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datap = &dirp->data;
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dirp->cached = 1;
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} else {
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/* Failed to re-open directory: no directory entry in memory */
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dirp->cached = 0;
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datap = NULL;
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}
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return datap;
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}
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/* Get next directory entry(internal) */
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static WIN32_FIND_DATAW*
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dirent_next(_WDIR *dirp)
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{
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WIN32_FIND_DATAW *p;
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/* Get next directory entry */
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if (dirp->cached != 0) {
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/* A valid directory entry already in memory */
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p = &dirp->data;
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dirp->cached = 0;
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} else if (dirp->handle != INVALID_HANDLE_VALUE) {
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/* Get the next directory entry from stream */
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if (FindNextFileW(dirp->handle, &dirp->data) != FALSE) {
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/* Got a file */
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p = &dirp->data;
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} else {
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/* The very last entry has been processed or an error occured */
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FindClose(dirp->handle);
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dirp->handle = INVALID_HANDLE_VALUE;
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p = NULL;
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}
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||
|
|
|
||
|
|
} 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;
|
||
|
|
|
||
|
|
/* Must have directory name */
|
||
|
|
if (dirname == NULL || dirname[0] == '\0') {
|
||
|
|
_set_errno(ENOENT);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Allocate memory for DIR structure */
|
||
|
|
dirp =(DIR*) malloc(sizeof(struct DIR));
|
||
|
|
if (dirp) {
|
||
|
|
wchar_t wname[PATH_MAX];
|
||
|
|
size_t n;
|
||
|
|
|
||
|
|
/* Convert directory name to wide-character string */
|
||
|
|
error = dirent_mbstowcs_s(&n, wname, PATH_MAX, dirname, PATH_MAX);
|
||
|
|
if (!error) {
|
||
|
|
|
||
|
|
/* Open directory stream using wide-character name */
|
||
|
|
dirp->wdirp = _wopendir(wname);
|
||
|
|
if (dirp->wdirp) {
|
||
|
|
/* Directory stream opened */
|
||
|
|
error = 0;
|
||
|
|
} else {
|
||
|
|
/* Failed to open directory stream */
|
||
|
|
error = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
error = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* Cannot allocate DIR structure */
|
||
|
|
error = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Clean up in case of error */
|
||
|
|
if (error && dirp) {
|
||
|
|
free(dirp);
|
||
|
|
dirp = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return dirp;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read next directory entry.
|
||
|
|
*
|
||
|
|
* When working with text consoles, please note that file names returned by
|
||
|
|
* readdir() are represented in the default ANSI code page while any output to
|
||
|
|
* console is typically formatted on another code page. Thus, non-ASCII
|
||
|
|
* characters in file names will not usually display correctly on console. The
|
||
|
|
* problem can be fixed in two ways:(1) change the character set of console
|
||
|
|
* to 1252 using chcp utility and use Lucida Console font, or(2) use
|
||
|
|
* _cprintf function when writing to console. The _cprinf() will re-encode
|
||
|
|
* ANSI strings to the console code page so many non-ASCII characters will
|
||
|
|
* display correcly.
|
||
|
|
*/
|
||
|
|
static struct dirent*
|
||
|
|
readdir(DIR *dirp)
|
||
|
|
{
|
||
|
|
WIN32_FIND_DATAW *datap;
|
||
|
|
struct dirent *entp;
|
||
|
|
|
||
|
|
/* 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, dirp->ent.d_name, PATH_MAX, datap->cFileName, PATH_MAX);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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, dirp->ent.d_name, PATH_MAX,
|
||
|
|
datap->cAlternateFileName, PATH_MAX);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!error) {
|
||
|
|
DWORD attr;
|
||
|
|
|
||
|
|
/* Initialize directory entry for return */
|
||
|
|
entp = &dirp->ent;
|
||
|
|
|
||
|
|
/* Length of file name excluding zero terminator */
|
||
|
|
entp->d_namlen = n - 1;
|
||
|
|
|
||
|
|
/* File attributes */
|
||
|
|
attr = datap->dwFileAttributes;
|
||
|
|
if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
|
||
|
|
entp->d_type = DT_CHR;
|
||
|
|
} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
|
||
|
|
entp->d_type = DT_DIR;
|
||
|
|
} else {
|
||
|
|
entp->d_type = DT_REG;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Reset dummy fields */
|
||
|
|
entp->d_ino = 0;
|
||
|
|
entp->d_reclen = sizeof(struct dirent);
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/*
|
||
|
|
* Cannot convert file name to multi-byte string so construct
|
||
|
|
* an errornous directory entry and return that. Note that
|
||
|
|
* we cannot return NULL as that would stop the processing
|
||
|
|
* of directory entries completely.
|
||
|
|
*/
|
||
|
|
entp = &dirp->ent;
|
||
|
|
entp->d_name[0] = '?';
|
||
|
|
entp->d_name[1] = '\0';
|
||
|
|
entp->d_namlen = 1;
|
||
|
|
entp->d_type = DT_UNKNOWN;
|
||
|
|
entp->d_ino = 0;
|
||
|
|
entp->d_reclen = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* No more directory entries */
|
||
|
|
entp = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return entp;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 */
|
||
|
|
_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);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Convert multi-byte string to wide character string */
|
||
|
|
static int
|
||
|
|
dirent_mbstowcs_s(size_t *pReturnValue, wchar_t *wcstr,
|
||
|
|
size_t sizeInWords, const char *mbstr, size_t count)
|
||
|
|
{
|
||
|
|
return mbstowcs_s(pReturnValue, wcstr, sizeInWords, mbstr, count);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Convert wide-character string to multi-byte string */
|
||
|
|
static int
|
||
|
|
dirent_wcstombs_s(size_t *pReturnValue, char *mbstr,
|
||
|
|
size_t sizeInBytes, /* max size of mbstr */
|
||
|
|
const wchar_t *wcstr, size_t count)
|
||
|
|
{
|
||
|
|
return wcstombs_s(pReturnValue, mbstr, sizeInBytes, wcstr, count);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /*DIRENT_H*/
|