/*****************************************************************************
* dirent.h - dirent API for Microsoft Visual Studio
*
* Copyright (C) 2006 Toni Ronkko
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* ``Software''), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Dec 15, 2009, John Cunningham
* Added rewinddir member function
*
* Jan 18, 2008, Toni Ronkko
* Using FindFirstFileA and WIN32_FIND_DATAA to avoid converting string
* between multi-byte and unicode representations. This makes the
* code simpler and also allows the code to be compiled under MingW. Thanks
* to Azriel Fasten for the suggestion.
*
* Mar 4, 2007, Toni Ronkko
* Bug fix: due to the strncpy_s() function this file only compiled in
* Visual Studio 2005. Using the new string functions only when the
* compiler version allows.
*
* Nov 2, 2006, Toni Ronkko
* Major update: removed support for Watcom C, MS-DOS and Turbo C to
* simplify the file, updated the code to compile cleanly on Visual
* Studio 2005 with both unicode and multi-byte character strings,
* removed rewinddir() as it had a bug.
*
* Aug 20, 2006, Toni Ronkko
* Removed all remarks about MSVC 1.0, which is antiqued now. Simplified
* comments by removing SGML tags.
*
* May 14 2002, Toni Ronkko
* Embedded the function definitions directly to the header so that no
* source modules need to be included in the Visual Studio project. Removed
* all the dependencies to other projects so that this very header can be
* used independently.
*
* May 28 1998, Toni Ronkko
* First version.
*****************************************************************************/
#include "dirent.h"
/* Use the new safe string functions introduced in Visual Studio 2005 */
#if defined(_MSC_VER) && _MSC_VER >= 1400
# define STRNCPY(dest,src,size) strncpy_s((dest),(size),(src),_TRUNCATE)
#else
# define STRNCPY(dest,src,size) strncpy((dest),(src),(size))
#endif
/*****************************************************************************
* Open directory stream DIRNAME for read and return a pointer to the
* internal working area that is used to retrieve individual directory
* entries.
*/
DIR *opendir(const char *dirname)
{
DIR *dirp;
assert (dirname != NULL);
assert (strlen (dirname) < MAX_PATH);
/* construct new DIR structure */
dirp = (DIR*) malloc (sizeof (struct DIR));
if (dirp != NULL) {
char *p;
/* take directory name... */
STRNCPY (dirp->patt, dirname, sizeof(dirp->patt));
dirp->patt[MAX_PATH] = '\0';
/* ... and append search pattern to it */
p = strchr (dirp->patt, '\0');
if (dirp->patt < p && *(p-1) != '\\' && *(p-1) != ':') {
*p++ = '\\';
}
*p++ = '*';
*p = '\0';
/* open stream and retrieve first file */
dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
if (dirp->search_handle == INVALID_HANDLE_VALUE) {
/* invalid search pattern? */
free (dirp);
return NULL;
}
/* there is an un-processed directory entry in memory now */
dirp->cached = 1;
}
return dirp;
}
/*****************************************************************************
* Read a directory entry, and return a pointer to a dirent structure
* containing the name of the entry in d_name field. Individual directory
* entries returned by this very function include regular files,
* sub-directories, pseudo-directories "." and "..", but also volume labels,
* hidden files and system files may be returned.
*/
struct dirent *readdir(DIR *dirp)
{
assert (dirp != NULL);
if (dirp->search_handle == INVALID_HANDLE_VALUE) {
/* directory stream was opened/rewound incorrectly or ended normally */
return NULL;
}
/* get next directory entry */
if (dirp->cached != 0) {
/* a valid directory entry already in memory */
dirp->cached = 0;
} else {
/* read next directory entry from disk */
if (FindNextFileA (dirp->search_handle, &dirp->current.data) == FALSE) {
/* the very last file has been processed or an error occured */
FindClose (dirp->search_handle);
dirp->search_handle = INVALID_HANDLE_VALUE;
return NULL;
}
}
/* copy as a multibyte character string */
STRNCPY ( dirp->current.d_name,
dirp->current.data.cFileName,
sizeof(dirp->current.d_name) );
dirp->current.d_name[MAX_PATH] = '\0';
return &dirp->current;
}
/*****************************************************************************
* Close directory stream opened by opendir() function. Close of the
* directory stream invalidates the DIR structure as well as any previously
* read directory entry.
*/
int closedir(DIR *dirp)
{
assert (dirp != NULL);
/* release search handle */
if (dirp->search_handle != INVALID_HANDLE_VALUE) {
FindClose (dirp->search_handle);
dirp->search_handle = INVALID_HANDLE_VALUE;
}
/* release directory handle */
free (dirp);
return 0;
}
/*****************************************************************************
* Resets the position of the directory stream to which dirp refers to the
* beginning of the directory. It also causes the directory stream to refer
* to the current state of the corresponding directory, as a call to opendir()
* would have done. If dirp does not refer to a directory stream, the effect
* is undefined.
*/
void rewinddir(DIR* dirp)
{
/* release search handle */
if (dirp->search_handle != INVALID_HANDLE_VALUE) {
FindClose (dirp->search_handle);
dirp->search_handle = INVALID_HANDLE_VALUE;
}
/* open new search handle and retrieve first file */
dirp->search_handle = FindFirstFileA (dirp->patt, &dirp->current.data);
if (dirp->search_handle == INVALID_HANDLE_VALUE) {
/* invalid search pattern? */
free (dirp);
return;
}
/* there is an un-processed directory entry in memory now */
dirp->cached = 1;
}
