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231 lines
7.6 KiB
C
231 lines
7.6 KiB
C
/*****************************************************************************
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* dirent.h - dirent API for Microsoft Visual Studio
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*
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* Copyright (C) 2006 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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* Dec 15, 2009, John Cunningham
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* Added rewinddir member function
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*
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* Jan 18, 2008, Toni Ronkko
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* Using FindFirstFileA and WIN32_FIND_DATAA to avoid converting string
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* between multi-byte and unicode representations. This makes the
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* code simpler and also allows the code to be compiled under MingW. Thanks
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* to Azriel Fasten for the suggestion.
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*
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* Mar 4, 2007, Toni Ronkko
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* Bug fix: due to the strncpy_s() function this file only compiled in
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* Visual Studio 2005. Using the new string functions only when the
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* compiler version allows.
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*
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* Nov 2, 2006, Toni Ronkko
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* Major update: removed support for Watcom C, MS-DOS and Turbo C to
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* simplify the file, updated the code to compile cleanly on Visual
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* Studio 2005 with both unicode and multi-byte character strings,
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* removed rewinddir() as it had a bug.
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*
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* Aug 20, 2006, Toni Ronkko
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* Removed all remarks about MSVC 1.0, which is antiqued now. Simplified
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* comments by removing SGML tags.
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*
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* May 14 2002, Toni Ronkko
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* Embedded the function definitions directly to the header so that no
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* source modules need to be included in the Visual Studio project. Removed
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* all the dependencies to other projects so that this very header can be
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* used independently.
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*
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* May 28 1998, Toni Ronkko
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* First version.
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*****************************************************************************/
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#ifndef DIRENT_H
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#define DIRENT_H
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#include <windows.h>
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#include <string.h>
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#include <assert.h>
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typedef struct dirent
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{
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char d_name[MAX_PATH + 1]; /* current dir entry (multi-byte char string) */
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WIN32_FIND_DATAA data; /* file attributes */
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} dirent;
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typedef struct DIR
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{
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dirent current; /* Current directory entry */
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int cached; /* Indicates un-processed entry in memory */
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HANDLE search_handle; /* File search handle */
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char patt[MAX_PATH + 3]; /* search pattern (3 = pattern + "\\*\0") */
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} DIR;
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/* Forward declarations */
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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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/* Use the new safe string functions introduced in Visual Studio 2005 */
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#if defined(_MSC_VER) && _MSC_VER >= 1400
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# define STRNCPY(dest,src,size) strncpy_s((dest),(size),(src),_TRUNCATE)
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#else
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# define STRNCPY(dest,src,size) strncpy((dest),(src),(size))
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#endif
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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 DIR *opendir(const char *dirname)
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{
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DIR *dirp;
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assert (dirname != NULL);
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assert (strlen (dirname) < MAX_PATH);
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/* construct new DIR structure */
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dirp = (DIR*) malloc (sizeof (struct DIR));
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if (dirp != NULL) {
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char *p;
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/* take directory name... */
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STRNCPY (dirp->patt, dirname, sizeof(dirp->patt));
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dirp->patt[MAX_PATH] = '\0';
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/* ... and append search pattern to it */
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p = strchr (dirp->patt, '\0');
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if (dirp->patt < p && *(p-1) != '\\' && *(p-1) != ':') {
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*p++ = '\\';
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}
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*p++ = '*';
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*p = '\0';
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/* open stream and retrieve first file */
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dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
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if (dirp->search_handle == INVALID_HANDLE_VALUE) {
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/* invalid search pattern? */
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free (dirp);
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return NULL;
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}
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/* there is an un-processed directory entry in memory now */
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dirp->cached = 1;
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}
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return dirp;
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}
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/*****************************************************************************
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* Read a directory entry, and return a pointer to a dirent structure
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* containing the name of the entry in d_name field. Individual directory
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* entries returned by this very function include regular files,
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* sub-directories, pseudo-directories "." and "..", but also volume labels,
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* hidden files and system files may be returned.
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*/
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static struct dirent *readdir(DIR *dirp)
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{
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assert (dirp != NULL);
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if (dirp->search_handle == INVALID_HANDLE_VALUE) {
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/* directory stream was opened/rewound incorrectly or ended normally */
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return NULL;
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}
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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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dirp->cached = 0;
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} else {
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/* read next directory entry from disk */
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if (FindNextFileA (dirp->search_handle, &dirp->current.data) == FALSE) {
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/* the very last file has been processed or an error occured */
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FindClose (dirp->search_handle);
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dirp->search_handle = INVALID_HANDLE_VALUE;
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return NULL;
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}
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}
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/* copy as a multibyte character string */
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STRNCPY ( dirp->current.d_name,
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dirp->current.data.cFileName,
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sizeof(dirp->current.d_name) );
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dirp->current.d_name[MAX_PATH] = '\0';
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return &dirp->current;
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}
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/*****************************************************************************
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* Close directory stream opened by opendir() function. Close of the
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* directory stream invalidates the DIR structure as well as any previously
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* read directory entry.
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*/
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static int closedir(DIR *dirp)
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{
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assert (dirp != NULL);
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/* release search handle */
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if (dirp->search_handle != INVALID_HANDLE_VALUE) {
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FindClose (dirp->search_handle);
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dirp->search_handle = INVALID_HANDLE_VALUE;
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}
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/* release directory handle */
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free (dirp);
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return 0;
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}
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/*****************************************************************************
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* Resets the position of the directory stream to which dirp refers to the
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* beginning of the directory. It also causes the directory stream to refer
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* to the current state of the corresponding directory, as a call to opendir()
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* would have done. If dirp does not refer to a directory stream, the effect
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* is undefined.
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*/
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static void rewinddir(DIR* dirp)
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{
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/* release search handle */
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if (dirp->search_handle != INVALID_HANDLE_VALUE) {
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FindClose (dirp->search_handle);
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dirp->search_handle = INVALID_HANDLE_VALUE;
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}
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/* open new search handle and retrieve first file */
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dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
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if (dirp->search_handle == INVALID_HANDLE_VALUE) {
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/* invalid search pattern? */
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free (dirp);
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return;
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}
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/* there is an un-processed directory entry in memory now */
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dirp->cached = 1;
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}
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#endif /*DIRENT_H*/
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