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/*
* iodir.c
*
* Copyright (C) Thomas Oestreich - May 2002
*
* This file is part of transcode, a video stream processing tool
*
* transcode is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* transcode is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "libtc.h"
#include "iodir.h"
#include <stdlib.h>
#include <string.h>
#ifdef OS_BSD
typedef off_t off64_t;
#define lseek64 lseek
#endif
/* get the next valid directory entry */
static int tc_dirlist_next(TCDirList *tcdir)
{
struct dirent *dent = NULL;
int have_file = 0;
if (tcdir == NULL) {
return -1;
}
do {
dent = readdir(tcdir->dir);
if (dent == NULL) {
break; /* all entries in dirlist have been processed */
}
if ((strncmp(dent->d_name, ".", 1) != 0)
&& (strcmp(dent->d_name, "..") != 0)) {
/* discard special files */
have_file = 1;
}
} while (!have_file);
if (have_file) {
tc_snprintf(tcdir->filename, sizeof(tcdir->filename),
"%s%s%s", tcdir->dir_name, tcdir->path_sep,
dent->d_name);
return 0;
}
return 1;
}
/* qsort helper */
static int compare_name(const void *file1_ptr, const void *file2_ptr)
{
return strcoll(*(const char **)file1_ptr, *(const char **)file2_ptr);
}
static int tc_dirlist_sortbuf(TCDirList *tcdir)
{
int n = 0;
if (tcdir == NULL) {
return -1;
}
tcdir->entries = tc_malloc(tcdir->nfiles * sizeof(char *));
if (tcdir->entries == NULL) {
return -1;
}
while (tc_dirlist_next(tcdir) == 0) {
tcdir->entries[n] = tc_strdup(tcdir->filename);
if (tcdir->entries[n] == NULL) {
tc_log_warn(__FILE__, "can't memorize dirlist entry "
"for '%s'\n", tcdir->filename);
}
n++;
}
qsort(tcdir->entries, tcdir->nfiles, sizeof(char *), compare_name);
tcdir->buffered = 1;
tcdir->findex = 0;
return 0;
}
static int tc_dirlist_set_path_sep(TCDirList *tcdir)
{
size_t len = 0;
char end_of_dir;
len = strlen(tcdir->dir_name);
if (len == 0) {
return -1;
}
end_of_dir = tcdir->dir_name[len - 1];
if (end_of_dir == '/') {
tcdir->path_sep = "";
} else {
tcdir->path_sep = "/";
}
return 0;
}
int tc_dirlist_file_count(TCDirList *tcdir)
{
if (tcdir == NULL) {
return -1;
}
return tcdir->nfiles;
}
int tc_dirlist_open(TCDirList *tcdir, const char *dirname, int sort)
{
int ret;
if (tcdir == NULL) {
return -1;
}
tcdir->filename[0] = '\0';
tcdir->entries = NULL;
tcdir->nfiles = 0;
tcdir->findex = 0;
tcdir->buffered = 0;
tcdir->dir_name = dirname;
ret = tc_dirlist_set_path_sep(tcdir);
if (ret != 0) {
return ret;
}
tcdir->dir = opendir(dirname);
if (tcdir->dir == NULL) {
return -1;
}
rewinddir(tcdir->dir);
while (tc_dirlist_next(tcdir) == 0) {
tcdir->nfiles++;
}
rewinddir(tcdir->dir);
if (sort) {
tc_dirlist_sortbuf(tcdir);
}
return 0;
}
void tc_dirlist_close(TCDirList *tcdir)
{
if (tcdir != NULL) {
if (tcdir->buffered == 1) {
int i = 0;
for (i = 0; i < tcdir->nfiles; i++) {
if (tcdir->entries[i] != NULL) {
/* should be always true */
free(tcdir->entries[i]);
tcdir->nfiles--;
}
}
if (tcdir->entries != NULL) {
/* should be always true */
free(tcdir->entries);
}
if (tcdir->nfiles > 0) {
/* should never happen */
tc_log_warn(__FILE__, "left out %i directory entries",
tcdir->nfiles);
}
}
if (tcdir->dir != NULL) {
closedir(tcdir->dir);
tcdir->dir = NULL;
}
}
}
const char *tc_dirlist_scan(TCDirList *tcdir)
{
const char *ret = NULL;
if (tcdir == NULL) {
return NULL;
}
if (tcdir->buffered == 0) {
if (tc_dirlist_next(tcdir) == 0) {
ret = tcdir->filename;
}
} else {
/* buffered */
if (tcdir->findex < tcdir->nfiles) {
ret = tcdir->entries[tcdir->findex++];
}
}
return ret;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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