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- /****************************************************************************
- * fs/nxffs/nxffs_dirent.c
- *
- * Copyright (C) 2011, 2017-2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * References: Linux/Documentation/filesystems/romfs.txt
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <string.h>
- #include <dirent.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/fs/fs.h>
- #include <nuttx/mtd/mtd.h>
- #include <nuttx/fs/dirent.h>
- #include "nxffs.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxffs_opendir
- *
- * Description:
- * Open a directory for read access
- *
- ****************************************************************************/
- int nxffs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
- FAR struct fs_dirent_s *dir)
- {
- struct nxffs_volume_s *volume;
- int ret;
- finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
- /* Sanity checks */
- DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
- /* Recover the file system state from the NuttX inode instance */
- volume = mountpt->i_private;
- ret = nxsem_wait(&volume->exclsem);
- if (ret < 0)
- {
- goto errout;
- }
- /* The requested directory must be the volume-relative "root" directory */
- if (relpath && relpath[0] != '\0')
- {
- ret = -ENOENT;
- goto errout_with_semaphore;
- }
- /* Set the offset to the offset to the first valid inode */
- dir->u.nxffs.nx_offset = volume->inoffset;
- ret = OK;
- errout_with_semaphore:
- nxsem_post(&volume->exclsem);
- errout:
- return ret;
- }
- /****************************************************************************
- * Name: nxffs_readdir
- *
- * Description: Read the next directory entry
- *
- ****************************************************************************/
- int nxffs_readdir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir)
- {
- FAR struct nxffs_volume_s *volume;
- FAR struct nxffs_entry_s entry;
- off_t offset;
- int ret;
- /* Sanity checks */
- DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
- /* Recover the file system state from the NuttX inode instance */
- volume = mountpt->i_private;
- ret = nxsem_wait(&volume->exclsem);
- if (ret < 0)
- {
- goto errout;
- }
- /* Read the next inode header from the offset */
- offset = dir->u.nxffs.nx_offset;
- ret = nxffs_nextentry(volume, offset, &entry);
- /* If the read was successful, then handle the reported inode. Note
- * that when the last inode has been reported, the value -ENOENT will
- * be returned.. which is correct for the readdir() method.
- */
- if (ret == OK)
- {
- /* Return the filename and file type */
- finfo("Offset %d: \"%s\"\n", entry.hoffset, entry.name);
- dir->fd_dir.d_type = DTYPE_FILE;
- strncpy(dir->fd_dir.d_name, entry.name, NAME_MAX+1);
- /* Discard this entry and set the next offset. */
- dir->u.nxffs.nx_offset = nxffs_inodeend(volume, &entry);
- nxffs_freeentry(&entry);
- ret = OK;
- }
- nxsem_post(&volume->exclsem);
- errout:
- return ret;
- }
- /****************************************************************************
- * Name: nxffs_rewindir
- *
- * Description:
- * Reset directory read to the first entry
- *
- ****************************************************************************/
- int nxffs_rewinddir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir)
- {
- FAR struct nxffs_volume_s *volume;
- int ret;
- finfo("Entry\n");
- /* Sanity checks */
- DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
- /* Recover the file system state from the NuttX inode instance */
- volume = mountpt->i_private;
- ret = nxsem_wait(&volume->exclsem);
- if (ret < 0)
- {
- goto errout;
- }
- /* Reset the offset to the FLASH offset to the first valid inode */
- dir->u.nxffs.nx_offset = volume->inoffset;
- ret = OK;
- nxsem_post(&volume->exclsem);
- errout:
- return ret;
- }
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