2843469876
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17280 a1c6a512-1295-4272-9138-f99709370657
308 lines
8.3 KiB
C
308 lines
8.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: dir.c 13741 2007-06-30 02:08:27Z jethead71 $
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include "fat.h"
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#include "dir.h"
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#include "debug.h"
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#define MAX_OPEN_DIRS 8
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static DIR_UNCACHED opendirs[MAX_OPEN_DIRS];
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#ifdef HAVE_MULTIVOLUME
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/* returns on which volume this is, and copies the reduced name
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(sortof a preprocessor for volume-decorated pathnames) */
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int strip_volume(const char* name, char* namecopy)
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{
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int volume = 0;
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const char *temp = name;
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while (*temp == '/') /* skip all leading slashes */
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++temp;
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if (*temp && !strncmp(temp, VOL_NAMES, VOL_ENUM_POS))
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{
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temp += VOL_ENUM_POS; /* behind special name */
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volume = atoi(temp); /* number is following */
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temp = strchr(temp, '/'); /* search for slash behind */
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if (temp != NULL)
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name = temp; /* use the part behind the volume */
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else
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name = "/"; /* else this must be the root dir */
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}
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strncpy(namecopy, name, MAX_PATH);
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namecopy[MAX_PATH-1] = '\0';
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return volume;
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}
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#endif /* #ifdef HAVE_MULTIVOLUME */
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#ifdef HAVE_HOTSWAP
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// release all dir handles on a given volume "by force", to avoid leaks
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int release_dirs(int volume)
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{
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DIR_UNCACHED* pdir = opendirs;
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int dd;
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int closed = 0;
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for ( dd=0; dd<MAX_OPEN_DIRS; dd++, pdir++)
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{
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if (pdir->fatdir.file.volume == volume)
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{
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pdir->busy = false; /* mark as available, no further action */
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closed++;
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}
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}
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return closed; /* return how many we did */
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}
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#endif /* #ifdef HAVE_HOTSWAP */
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DIR_UNCACHED* opendir_uncached(const char* name)
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{
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char namecopy[MAX_PATH];
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char* part;
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char* end;
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struct fat_direntry entry;
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int dd;
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DIR_UNCACHED* pdir = opendirs;
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#ifdef HAVE_MULTIVOLUME
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int volume;
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#endif
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if ( name[0] != '/' ) {
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DEBUGF("Only absolute paths supported right now\n");
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return NULL;
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}
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/* find a free dir descriptor */
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for ( dd=0; dd<MAX_OPEN_DIRS; dd++, pdir++)
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if ( !pdir->busy )
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break;
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if ( dd == MAX_OPEN_DIRS ) {
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DEBUGF("Too many dirs open\n");
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errno = EMFILE;
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return NULL;
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}
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pdir->busy = true;
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#ifdef HAVE_MULTIVOLUME
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/* try to extract a heading volume name, if present */
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volume = strip_volume(name, namecopy);
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pdir->volumecounter = 0;
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#else
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strncpy(namecopy,name,sizeof(namecopy)); /* just copy */
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namecopy[sizeof(namecopy)-1] = '\0';
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#endif
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if ( fat_opendir(IF_MV2(volume,) &pdir->fatdir, 0, NULL) < 0 ) {
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DEBUGF("Failed opening root dir\n");
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pdir->busy = false;
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return NULL;
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}
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for ( part = strtok_r(namecopy, "/", &end); part;
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part = strtok_r(NULL, "/", &end)) {
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/* scan dir for name */
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while (1) {
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if ((fat_getnext(&pdir->fatdir,&entry) < 0) ||
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(!entry.name[0])) {
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pdir->busy = false;
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return NULL;
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}
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if ( (entry.attr & FAT_ATTR_DIRECTORY) &&
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(!strcasecmp(part, entry.name)) ) {
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pdir->parent_dir = pdir->fatdir;
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if ( fat_opendir(IF_MV2(volume,)
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&pdir->fatdir,
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entry.firstcluster,
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&pdir->parent_dir) < 0 ) {
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DEBUGF("Failed opening dir '%s' (%ld)\n",
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part, entry.firstcluster);
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pdir->busy = false;
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return NULL;
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}
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#ifdef HAVE_MULTIVOLUME
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pdir->volumecounter = -1; /* n.a. to subdirs */
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#endif
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break;
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}
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}
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}
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return pdir;
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}
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int closedir_uncached(DIR_UNCACHED* dir)
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{
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dir->busy=false;
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return 0;
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}
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struct dirent_uncached* readdir_uncached(DIR_UNCACHED* dir)
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{
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struct fat_direntry entry;
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struct dirent_uncached* theent = &(dir->theent);
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if (!dir->busy)
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return NULL;
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#ifdef HAVE_MULTIVOLUME
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/* Volumes (secondary file systems) get inserted into the root directory
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of the first volume, since we have no separate top level. */
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if (dir->volumecounter >= 0 /* on a root dir */
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&& dir->volumecounter < NUM_VOLUMES /* in range */
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&& dir->fatdir.file.volume == 0) /* at volume 0 */
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{ /* fake special directories, which don't really exist, but
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will get redirected upon opendir_uncached() */
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while (++dir->volumecounter < NUM_VOLUMES)
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{
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if (fat_ismounted(dir->volumecounter))
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{
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memset(theent, 0, sizeof(*theent));
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theent->attribute = FAT_ATTR_DIRECTORY | FAT_ATTR_VOLUME;
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snprintf(theent->d_name, sizeof(theent->d_name),
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VOL_NAMES, dir->volumecounter);
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return theent;
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}
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}
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}
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#endif
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/* normal directory entry fetching follows here */
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if (fat_getnext(&(dir->fatdir),&entry) < 0)
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return NULL;
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if ( !entry.name[0] )
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return NULL;
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strncpy(theent->d_name, entry.name, sizeof( theent->d_name ) );
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theent->attribute = entry.attr;
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theent->size = entry.filesize;
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theent->startcluster = entry.firstcluster;
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theent->wrtdate = entry.wrtdate;
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theent->wrttime = entry.wrttime;
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return theent;
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}
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int mkdir_uncached(const char *name)
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{
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DIR_UNCACHED *dir;
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char namecopy[MAX_PATH];
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char* end;
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char *basename;
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char *parent;
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struct dirent_uncached *entry;
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struct fat_dir newdir;
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int rc;
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if ( name[0] != '/' ) {
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DEBUGF("mkdir: Only absolute paths supported right now\n");
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return -1;
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}
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strncpy(namecopy,name,sizeof(namecopy));
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namecopy[sizeof(namecopy)-1] = 0;
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/* Split the base name and the path */
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end = strrchr(namecopy, '/');
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*end = 0;
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basename = end+1;
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if(namecopy == end) /* Root dir? */
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parent = "/";
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else
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parent = namecopy;
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DEBUGF("mkdir: parent: %s, name: %s\n", parent, basename);
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dir = opendir_uncached(parent);
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if(!dir) {
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DEBUGF("mkdir: can't open parent dir\n");
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return -2;
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}
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if(basename[0] == 0) {
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DEBUGF("mkdir: Empty dir name\n");
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errno = EINVAL;
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return -3;
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}
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/* Now check if the name already exists */
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while ((entry = readdir_uncached(dir))) {
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if ( !strcasecmp(basename, entry->d_name) ) {
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DEBUGF("mkdir error: file exists\n");
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errno = EEXIST;
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closedir_uncached(dir);
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return - 4;
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}
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}
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memset(&newdir, sizeof(struct fat_dir), 0);
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rc = fat_create_dir(basename, &newdir, &(dir->fatdir));
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closedir_uncached(dir);
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return rc;
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}
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int rmdir_uncached(const char* name)
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{
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int rc;
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DIR_UNCACHED* dir;
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struct dirent_uncached* entry;
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dir = opendir_uncached(name);
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if (!dir)
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{
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errno = ENOENT; /* open error */
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return -1;
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}
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/* check if the directory is empty */
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while ((entry = readdir_uncached(dir)))
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{
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if (strcmp(entry->d_name, ".") &&
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strcmp(entry->d_name, ".."))
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{
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DEBUGF("rmdir error: not empty\n");
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errno = ENOTEMPTY;
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closedir_uncached(dir);
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return -2;
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}
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}
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rc = fat_remove(&(dir->fatdir.file));
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if ( rc < 0 ) {
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DEBUGF("Failed removing dir: %d\n", rc);
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errno = EIO;
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rc = rc * 10 - 3;
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}
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closedir_uncached(dir);
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return rc;
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}
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