_mfs_error MFS_Remove_subdir
(
MFS_DRIVE_STRUCT_PTR drive_ptr,
char *pathname /*[IN] pathname of the directory to be removed */
)
{
_mfs_error error_code, saved_error = 0;
uint32_t dir_cluster, parent_cluster, dir_index;
MFS_DIR_ENTRY_PTR dir_entry_ptr;
uint32_t prev_cluster= CLUSTER_INVALID;
uint32_t parent_prev_cluster= CLUSTER_INVALID;
if ( (pathname == NULL) || (*pathname == '\0') )
{
return MFS_INVALID_PARAMETER;
}
error_code = MFS_lock_dos_disk( drive_ptr );
if ( error_code != MFS_NO_ERROR )
{
return error_code;
}
dir_entry_ptr = MFS_Find_entry_on_disk (drive_ptr, pathname, &error_code, &parent_cluster, &dir_index, &parent_prev_cluster);
if ( dir_entry_ptr )
{
if ( mqx_dtohc(dir_entry_ptr->ATTRIBUTE) & MFS_ATTR_DIR_NAME )
{
dir_cluster = clustoh(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER);
if ( dir_cluster != drive_ptr->CUR_DIR_CLUSTER )
{
dir_index = 2; /* Skip over '.' and '..' */
dir_entry_ptr = MFS_Find_directory_entry (drive_ptr, NULL, &dir_cluster, &dir_index, &prev_cluster, MFS_ATTR_ANY, &error_code);
if ( dir_entry_ptr == NULL && !error_code )
{
dir_index = 0;
dir_entry_ptr = MFS_Find_entry_on_disk (drive_ptr, pathname, &error_code, &parent_cluster, &dir_index, &parent_prev_cluster);
if ( dir_entry_ptr )
{
*dir_entry_ptr->NAME = MFS_DEL_FILE;
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
error_code = MFS_remove_lfn_entries(drive_ptr, parent_cluster, dir_index, parent_prev_cluster);
if ( !error_code )
{
saved_error = MFS_Release_chain(drive_ptr, dir_cluster);
}
}
}
else if ( dir_entry_ptr != NULL && !error_code )
{
error_code = MFS_FILE_EXISTS;
}
}
else
{
error_code = MFS_ATTEMPT_TO_REMOVE_CURRENT_DIR;
}
}
else
{
error_code = MFS_WRITE_FAULT;
}
}
else
{
error_code = MFS_PATH_NOT_FOUND;
}
MFS_unlock(drive_ptr,TRUE);
if ( saved_error == MFS_LOST_CHAIN && error_code == MFS_NO_ERROR )
{
error_code = saved_error;
}
return(error_code);
}
void *MFS_Create_file
(
MFS_DRIVE_STRUCT_PTR drive_ptr,
unsigned char attr, /*[IN] attribute for created file*/
char *pathname, /*[IN] directory and filename of the file to be created */
_mfs_error_ptr error_ptr /*[IN/OUT] error code is written to this address */
)
{
MFS_HANDLE_PTR handle;
MFS_HANDLE_PTR next_handle;
MFS_DIR_ENTRY_PTR dir_entry_ptr;
TIME_STRUCT time;
DATE_STRUCT clk_time;
uint32_t dir_cluster;
uint32_t dir_index;
char access;
_mfs_error error_code, saved_code = 0;
if ( (pathname == NULL) || (*pathname == '\0') )
{
*error_ptr = MFS_INVALID_PARAMETER;
return( NULL );
}
#if MFSCFG_READ_ONLY_CHECK
if (MFS_is_read_only (drive_ptr))
{
*error_ptr = MFS_DISK_IS_WRITE_PROTECTED;
return NULL;
}
#endif
error_code = MFS_lock_dos_disk( drive_ptr );
if ( error_code != MFS_NO_ERROR )
{
*error_ptr = error_code;
return( NULL );
}
handle = NULL;
attr &= (MFS_ATTR_READ_ONLY | MFS_ATTR_HIDDEN_FILE | MFS_ATTR_SYSTEM_FILE | MFS_ATTR_ARCHIVE | MFS_ATTR_VOLUME_NAME);
attr |= MFS_ATTR_ARCHIVE;
access = (attr & MFS_ATTR_READ_ONLY) ? MFS_ACCESS_READ_ONLY : MFS_ACCESS_READ_WRITE;
dir_entry_ptr = MFS_Create_entry_slave(drive_ptr, attr, pathname, &dir_cluster, &dir_index, &error_code, TRUE);
if ( (dir_entry_ptr != NULL) && !(attr & MFS_ATTR_VOLUME_NAME) )
{
handle = MFS_Get_handle(drive_ptr,dir_entry_ptr);
if ( handle != NULL )
{
handle->DIR_CLUSTER = dir_cluster;
handle->DIR_INDEX = dir_index;
handle->ACCESS = access;
handle->CURRENT_CLUSTER = 0;
handle->PREVIOUS_CLUSTER = 0;
/*
** If file exists, overwrite and set size to 0
*/
if ( error_code == MFS_FILE_EXISTS )
{
_time_get(&time);
_time_to_date(&time, &clk_time);
NORMALIZE_DATE(&clk_time);
saved_code = MFS_Release_chain(drive_ptr, clustoh(handle->DIR_ENTRY.HFIRST_CLUSTER, handle->DIR_ENTRY.LFIRST_CLUSTER));
if ( saved_code == MFS_NO_ERROR || saved_code == MFS_LOST_CHAIN )
{
clustod(handle->DIR_ENTRY.HFIRST_CLUSTER, handle->DIR_ENTRY.LFIRST_CLUSTER, 0);
mqx_htodl(handle->DIR_ENTRY.FILE_SIZE, 0L);
mqx_htodc(handle->DIR_ENTRY.ATTRIBUTE, attr);
mqx_htods(handle->DIR_ENTRY.TIME, PACK_TIME(clk_time));
mqx_htods(handle->DIR_ENTRY.DATE, PACK_DATE(clk_time));
error_code = MFS_Update_entry(drive_ptr, handle);
/*
** If the same file is already open, mark it as 'freshly
** truncated' so reads and writes don't clobber any data.
*/
if ( error_code == MFS_NO_ERROR )
{
next_handle = (MFS_HANDLE_PTR) _queue_head(&drive_ptr->HANDLE_LIST);
while ( next_handle )
{
if ( next_handle->DIR_CLUSTER == dir_cluster && next_handle->DIR_INDEX == dir_index )
{
next_handle->CURRENT_CLUSTER = 0;
next_handle->PREVIOUS_CLUSTER = 0;
}
next_handle = (MFS_HANDLE_PTR) _queue_next(&drive_ptr->HANDLE_LIST, (QUEUE_ELEMENT_STRUCT_PTR) next_handle);
}
}
}
}
/*
** No need to update the disk image if we didn't change anything.
*/
if ( (mqx_dtohc(handle->DIR_ENTRY.ATTRIBUTE) != attr) && (error_code == MFS_NO_ERROR) )
{
mqx_htodc(handle->DIR_ENTRY.ATTRIBUTE, attr);
error_code = MFS_Update_entry(drive_ptr, handle);
}
}
else
{
error_code = MFS_INSUFFICIENT_MEMORY;
}
}
MFS_unlock(drive_ptr,FALSE);
if ( error_code == MFS_NO_ERROR && saved_code == MFS_LOST_CHAIN )
{
*error_ptr = saved_code;
}
else
{
*error_ptr = error_code;
}
return((void *)handle);
}
_mfs_error MFS_Delete_file
(
MQX_FILE_PTR mfs_fd_ptr, /*[IN] the MFS device on which to operate */
char_ptr pathname /*[IN] directory and file name of the file to delete */
)
{
MFS_DRIVE_STRUCT_PTR drive_ptr;
MFS_DIR_ENTRY_PTR dir_entry_ptr;
_mfs_error error_code, saved_code = 0;
uint_32 dir_cluster, dir_index;
uint_32 first_cluster;
uint_32 prev_cluster= CLUSTER_INVALID;
if ( (pathname == NULL) || (*pathname == '\0') )
{
return MFS_INVALID_PARAMETER;
}
#if MFSCFG_READ_ONLY_CHECK
if (MFS_is_read_only (mfs_fd_ptr, NULL))
{
return MFS_DISK_IS_WRITE_PROTECTED;
}
#endif
error_code = MFS_lock_dos_disk( mfs_fd_ptr, &drive_ptr );
if ( error_code != MFS_NO_ERROR )
{
return error_code;
}
dir_entry_ptr = MFS_Find_entry_on_disk(drive_ptr, pathname, &error_code, &dir_cluster, &dir_index, &prev_cluster);
if ( dir_entry_ptr != NULL )
{
if ( dtohc(dir_entry_ptr->ATTRIBUTE) & (MFS_ATTR_DIR_NAME | MFS_ATTR_VOLUME_NAME | MFS_ATTR_READ_ONLY) )
{
error_code = MFS_ACCESS_DENIED;
}
else
{
first_cluster = clustoh(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER);
if ( first_cluster )
{
saved_code = MFS_Release_chain(drive_ptr, first_cluster);
if ( saved_code != MFS_LOST_CHAIN && saved_code != MFS_NO_ERROR )
{
MFS_unlock(drive_ptr,TRUE);
return(saved_code);
}
}
/*
** Mark all open files with the same name as erased
*/
MFS_Delete_handles(drive_ptr, dir_entry_ptr->NAME, first_cluster);
*dir_entry_ptr->NAME = MFS_DEL_FILE;
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
error_code = MFS_remove_lfn_entries(drive_ptr,dir_cluster,dir_index, prev_cluster);
}
}
MFS_unlock(drive_ptr,TRUE);
if ( saved_code == MFS_LOST_CHAIN && error_code == MFS_NO_ERROR )
{
error_code = saved_code;
}
return(error_code);
}
