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/**
* @file
*
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/imfs.h>
#include <sys/param.h>
#include <dirent.h>
#include <string.h>
static ssize_t IMFS_dir_read(
rtems_libio_t *iop,
void *buffer,
size_t count
)
{
/*
* Read up to element iop->offset in the directory chain of the
* imfs_jnode_t struct for this file descriptor.
*/
const IMFS_directory_t *dir;
const rtems_chain_node *node;
const rtems_chain_control *entries;
struct dirent *dir_ent;
ssize_t bytes_transferred;
off_t current_entry;
off_t first_entry;
off_t last_entry;
rtems_filesystem_instance_lock( &iop->pathinfo );
dir = IMFS_iop_to_directory( iop );
entries = &dir->Entries;
/* Move to the first of the desired directory entries */
bytes_transferred = 0;
first_entry = iop->offset;
/* protect against using sizes that are not exact multiples of the */
/* -dirent- size. These could result in unexpected results */
last_entry = first_entry
+ (count / sizeof( *dir_ent )) * sizeof( *dir_ent );
/* The directory was not empty so try to move to the desired entry in chain*/
for (
current_entry = 0,
node = rtems_chain_immutable_first( entries );
current_entry < last_entry
&& !rtems_chain_is_tail( entries, node );
current_entry += sizeof( *dir_ent ),
node = rtems_chain_immutable_next( node )
) {
if( current_entry >= first_entry ) {
const IMFS_jnode_t *imfs_node = (const IMFS_jnode_t *) node;
dir_ent = (struct dirent *) ((char *) buffer + bytes_transferred);
/* Move the entry to the return buffer */
dir_ent->d_off = current_entry;
dir_ent->d_reclen = sizeof( *dir_ent );
dir_ent->d_ino = IMFS_node_to_ino( imfs_node );
#ifdef DT_DIR
dir_ent->d_type = IFTODT( imfs_node->st_mode );
#endif
dir_ent->d_namlen =
MIN( imfs_node->namelen, sizeof( dir_ent->d_name ) - 1 );
dir_ent->d_name[ dir_ent->d_namlen ] = '\0';
memcpy( dir_ent->d_name, imfs_node->name, dir_ent->d_namlen );
iop->offset += sizeof( *dir_ent );
bytes_transferred += (ssize_t) sizeof( *dir_ent );
}
}
rtems_filesystem_instance_unlock( &iop->pathinfo );
return bytes_transferred;
}
static size_t IMFS_directory_size( const IMFS_jnode_t *node )
{
size_t size = 0;
const IMFS_directory_t *dir = (const IMFS_directory_t *) node;
const rtems_chain_control *chain = &dir->Entries;
const rtems_chain_node *current = rtems_chain_immutable_first( chain );
const rtems_chain_node *tail = rtems_chain_immutable_tail( chain );
while ( current != tail ) {
size += sizeof( struct dirent );
current = rtems_chain_immutable_next( current );
}
return size;
}
static int IMFS_stat_directory(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_jnode_t *node = loc->node_access;
buf->st_size = IMFS_directory_size( node );
return IMFS_stat( loc, buf );
}
static const rtems_filesystem_file_handlers_r IMFS_dir_default_handlers = {
.open_h = rtems_filesystem_default_open,
.close_h = rtems_filesystem_default_close,
.read_h = IMFS_dir_read,
.write_h = rtems_filesystem_default_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek_directory,
.fstat_h = IMFS_stat_directory,
.ftruncate_h = rtems_filesystem_default_ftruncate_directory,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.mmap_h = rtems_filesystem_default_mmap,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
const IMFS_mknod_control IMFS_mknod_control_dir_default = {
{
.handlers = &IMFS_dir_default_handlers,
.node_initialize = IMFS_node_initialize_directory,
.node_remove = IMFS_node_remove_directory,
.node_destroy = IMFS_node_destroy_default
},
.node_size = sizeof( IMFS_directory_t )
};
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