_mfs_error MFS_Create_subdir
(
MFS_DRIVE_STRUCT_PTR drive_ptr,
char *pathname /*[IN] pathname of the directory to be created */
)
{
MFS_DIR_ENTRY_PTR dir_entry_ptr;
uint32_t dir_cluster;
uint32_t parent_cluster;
uint32_t free_cluster;
uint32_t dir_index;
_mfs_error error_code;
char *temp_dirname;
char *temp_filename;
if ( (pathname == NULL) || (*pathname == '\0') )
{
return MFS_INVALID_PARAMETER;
}
#if MFSCFG_READ_ONLY_CHECK
if (MFS_is_read_only (drive_ptr))
{
return MFS_DISK_IS_WRITE_PROTECTED;
}
#endif
error_code = MFS_alloc_2paths(&temp_dirname,&temp_filename);
if ( error_code != MFS_NO_ERROR )
{
return( error_code );
}
error_code = MFS_lock_dos_disk( drive_ptr );
if ( error_code != MFS_NO_ERROR )
{
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
return error_code;
}
MFS_Parse_pathname (temp_dirname, temp_filename, pathname);
dir_cluster = drive_ptr->CUR_DIR_CLUSTER;
parent_cluster = MFS_Find_directory (drive_ptr, temp_dirname, dir_cluster);
dir_cluster = parent_cluster;
if ( MFS_is_valid_lfn(temp_filename) )
{
if ( dir_cluster != CLUSTER_INVALID )
{
/*
** We'll obtain a cluster for the new directory first. If we
** cannot create the directory afterwards, it is easier to re-free
** the cluster than to remove the new entry.
*/
free_cluster = MFS_Find_unused_cluster_from(drive_ptr, drive_ptr->NEXT_FREE_CLUSTER);
if ( free_cluster != CLUSTER_INVALID )
{
error_code = MFS_Clear_cluster(drive_ptr, free_cluster);
if ( error_code )
{
MFS_unlock(drive_ptr,TRUE);
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
return( error_code );
}
error_code = MFS_Put_fat(drive_ptr, free_cluster, CLUSTER_EOF);
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr, temp_filename, MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, free_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
/*
** We shall now create the "." and ".." entries.
*/
dir_cluster = free_cluster;
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr,".", MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, free_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr,"..", MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
if ( drive_ptr->FAT_TYPE == MFS_FAT32 )
{
if ( drive_ptr->BPB32.ROOT_CLUSTER == parent_cluster )
{
/*
** Even though the FAT32 root sector can be
** anywhere, it is identified as 0 when referenced
** through a directory entry
*/
parent_cluster = 0;
}
}
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, parent_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
}
}
}
else
{
MFS_Put_fat(drive_ptr, free_cluster, CLUSTER_UNUSED);
}
}
else
{
error_code = MFS_DISK_FULL;
}
}
else
{
error_code = MFS_PATH_NOT_FOUND;
}
}
else if ( MFS_lfn_dirname_valid(temp_filename) )
{
if ( dir_cluster )
{
error_code = MFS_FILE_EXISTS;
}
else
{
error_code = MFS_CANNOT_CREATE_DIRECTORY;
}
}
else
{
error_code = MFS_INVALID_PARAMETER;
}
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
MFS_unlock(drive_ptr,TRUE);
return(error_code);
}
MFS_DIR_ENTRY_PTR MFS_Create_entry_slave
(
MFS_DRIVE_STRUCT_PTR drive_ptr, /*[IN] the drive on which to operate */
uchar attr, /*[IN] attribute to be given to the new file */
char_ptr pathname, /*[IN] directory and file name to be given to the new file */
uint_32_ptr cluster_ptr, /*[OUT] cluster # in the directory where the entry was created */
uint_32_ptr index_ptr, /*[OUT] index # in the directory where the entry was created*/
_mfs_error_ptr error_ptr, /*[IN/OUT] error code is written to this address */
boolean overwrite /*[IN] if TRUE, we will overwrite an existing entry w/the same name */
)
{
MFS_DIR_ENTRY_PTR dir_entry_ptr;
char_ptr temp_dirname;
char_ptr temp_filename;
uchar at;
uint_32 dir_cluster;
uint_32 dir_index;
uint_32 vol_cluster,
vol_index;
_mfs_error error_code;
uint_32 prev_cluster;
#if MFSCFG_READ_ONLY_CHECK
if (MFS_is_read_only (NULL, drive_ptr))
{
if ( error_ptr )
{
*error_ptr = MFS_DISK_IS_WRITE_PROTECTED;
}
return NULL;
}
#endif
dir_index = 0;
dir_cluster = drive_ptr->CUR_DIR_CLUSTER;
dir_entry_ptr = NULL;
error_code = MFS_alloc_2paths(&temp_dirname,&temp_filename);
if ( error_code )
{
return( NULL );
}
error_code = MFS_Parse_pathname(temp_dirname, temp_filename, pathname);
if ( error_code == MFS_NO_ERROR )
{
dir_cluster = MFS_Find_directory(drive_ptr, temp_dirname, dir_cluster);
if ( dir_cluster == CLUSTER_INVALID )
{
error_code = MFS_PATH_NOT_FOUND;
}
else
{
if ( MFS_is_valid_lfn(temp_filename) )
{
if ( attr & MFS_ATTR_VOLUME_NAME )
{
/*
** If creating a volume label, it must be in the root
** directory.
*/
if ( dir_cluster == 0 )
{
vol_cluster = 0;
vol_index = 0;
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, NULL, &vol_cluster,
&vol_index, &prev_cluster, MFS_ATTR_VOLUME_NAME, &error_code);
if ( dir_entry_ptr )
{
error_code = MFS_ALREADY_ASSIGNED;
}
}
else
{
error_code = MFS_ACCESS_DENIED;
}
}
if ( error_code == MFS_NO_ERROR )
{
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr, temp_filename, attr, &dir_cluster, &dir_index, &error_code);
/* if dir_entry_ptr == NULL
** we couldn't create a new entry.
** if not NULL, it may be a brand new entry (MFS_NO_ERROR) or
** an old one (MFS_FILE_EXISTS)
*/
if ( dir_entry_ptr != NULL )
{
at = dtohc(dir_entry_ptr->ATTRIBUTE);
if ( (error_code != MFS_NO_ERROR) && (overwrite == FALSE) )
{
dir_entry_ptr = NULL;
}
else if ( (error_code == MFS_FILE_EXISTS) && ((at & MFS_ATTR_DIR_NAME) != (attr & MFS_ATTR_DIR_NAME))
|| ((at & MFS_ATTR_VOLUME_NAME) != (attr & MFS_ATTR_VOLUME_NAME)) )
{
error_code = MFS_WRITE_FAULT;
dir_entry_ptr = NULL;
}
else if ( at & MFS_ATTR_READ_ONLY && error_code !=
MFS_NO_ERROR )
{
/*
** If not freshly created
*/
error_code = MFS_ACCESS_DENIED;
dir_entry_ptr = NULL;
}
}
*cluster_ptr = dir_cluster;
*index_ptr = dir_index;
}
}
else
{
error_code = MFS_INVALID_PARAMETER;
dir_entry_ptr = NULL;
}
}
}
if ( error_ptr )
{
*error_ptr = error_code;
}
MFS_free_path(temp_filename);
MFS_free_path(temp_dirname);
return(dir_entry_ptr);
}