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Added directory iterator functions

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This commit is contained in:
Michael Chisholm 2006-08-14 12:04:16 +00:00
parent 1288d8f8ec
commit 11140aaa33
2 changed files with 126 additions and 0 deletions
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104
source/fatdir.c
View File

@ -30,6 +30,9 @@
2006-08-13 - Chishm
* Moved all externally visible directory related functions to fatdir
* Added _FAT_mkdir_r
2006-08-14 - Chishm
* Added directory iterator functions
*/
#include <string.h>
@ -37,6 +40,8 @@
#include <ctype.h>
#include <unistd.h>
#include "fatdir.h"
#include "cache.h"
#include "file_allocation_table.h"
#include "partition.h"
@ -421,3 +426,102 @@ int _FAT_mkdir_r (struct _reent *r, const char *path, int mode) {
return 0;
}
dir_iter_t* _FAT_diropen_r(struct _reent *r, dir_iter_t *dirState, const char *path) {
DIR_ENTRY dirEntry;
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) dirState;
bool fileExists;
state->partition = _FAT_partition_getPartitionFromPath (path);
if (state->partition == NULL) {
r->_errno = ENODEV;
return NULL;
}
// Move the path pointer to the start of the actual path
if (strchr (path, ':') != NULL) {
path = strchr (path, ':') + 1;
}
if (strchr (path, ':') != NULL) {
r->_errno = EINVAL;
return NULL;
}
// Get the start cluster of the directory
fileExists = _FAT_directory_entryFromPath (state->partition, &dirEntry, path, NULL);
if (!fileExists) {
r->_errno = ENOENT;
return NULL;
}
// Make sure it is a directory
if (! _FAT_directory_isDirectory (&dirEntry)) {
r->_errno = ENOTDIR;
return NULL;
}
// Save the start cluster for use when resetting the directory data
state->startCluster = _FAT_directory_entryGetCluster (dirEntry.entryData);
// Get the first entry for use with a call to dirnext
state->validEntry =
_FAT_directory_getFirstEntry (state->partition, &(state->currentEntry), state->startCluster);
// We are now using this entry
state->inUse = true;
return (dir_iter_t*) state;
}
int _FAT_dirreset_r (struct _reent *r, dir_iter_t *dirState) {
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) dirState;
// Make sure we are still using this entry
if (!state->inUse) {
r->_errno = EBADF;
return -1;
}
// Get the first entry for use with a call to dirnext
state->validEntry =
_FAT_directory_getFirstEntry (state->partition, &(state->currentEntry), state->startCluster);
return 0;
}
int _FAT_dirnext_r (struct _reent *r, dir_iter_t *dirState, char *filename, struct stat *filestat) {
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) dirState;
// Make sure we are still using this entry
if (!state->inUse) {
r->_errno = EBADF;
return -1;
}
// Make sure there is another file to report on
if (! state->validEntry) {
r->_errno = ENOENT;
return -1;
}
// Get the filename
strncpy (filename, state->currentEntry.filename, MAX_FILENAME_LENGTH);
// Get the stats, if requested
if (filestat != NULL) {
_FAT_directory_entryStat (state->partition, &(state->currentEntry), filestat);
}
// Look for the next entry for use next time
state->validEntry =
_FAT_directory_getNextEntry (state->partition, &(state->currentEntry));
return 0;
}
int _FAT_dirclose_r (struct _reent *r, dir_iter_t *dirState) {
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) dirState;
// We are no longer using this entry
state->inUse = false;
return 0;
}

22
source/fatdir.h
View File

@ -30,6 +30,9 @@
2006-08-13 - Chishm
* Moved all externally visible directory related functions to fatdir
* Added _FAT_mkdir_r
2006-08-14 - Chishm
* Added directory iterator functions
*/
@ -38,7 +41,17 @@
#include <sys/reent.h>
#include <sys/stat.h>
#include <sys/iosupport.h>
#include "common.h"
#include "directory.h"
typedef struct {
PARTITION* partition;
DIR_ENTRY currentEntry;
u32 startCluster;
bool inUse;
bool validEntry;
} DIR_STATE_STRUCT;
extern int _FAT_stat_r (struct _reent *r, const char *path, struct stat *st);
@ -52,4 +65,13 @@ extern int _FAT_rename_r (struct _reent *r, const char *oldName, const char *new
extern int _FAT_mkdir_r (struct _reent *r, const char *path, int mode);
/*
Directory iterator functions
*/
extern dir_iter_t* _FAT_diropen_r(struct _reent *r, dir_iter_t *dirState, const char *path);
extern int _FAT_dirreset_r (struct _reent *r, dir_iter_t *dirState);
extern int _FAT_dirnext_r (struct _reent *r, dir_iter_t *dirState, char *filename, struct stat *filestat);
extern int _FAT_dirclose_r (struct _reent *r, dir_iter_t *dirState);
#endif // _FATDIR_H