diff options
Diffstat (limited to 'nuttx/fs/nxffs/nxffs_dirent.c')
| -rw-r--r-- | nuttx/fs/nxffs/nxffs_dirent.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/nuttx/fs/nxffs/nxffs_dirent.c b/nuttx/fs/nxffs/nxffs_dirent.c new file mode 100644 index 000000000..562a5320b --- /dev/null +++ b/nuttx/fs/nxffs/nxffs_dirent.c @@ -0,0 +1,217 @@ +/**************************************************************************** + * fs/nxffs/nxffs_dirent.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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/fs/fs.h> +#include <nuttx/mtd.h> +#include <nuttx/fs/dirent.h> + +#include "nxffs.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * 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; + + fvdbg("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 = sem_wait(&volume->exclsem); + if (ret != OK) + { + 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: + sem_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 = sem_wait(&volume->exclsem); + if (ret != OK) + { + 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 */ + + fvdbg("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; + } + + sem_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; + + fvdbg("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 = sem_wait(&volume->exclsem); + if (ret != OK) + { + goto errout; + } + + /* Reset the offset to the FLASH offset to the first valid inode */ + + dir->u.nxffs.nx_offset = volume->inoffset; + ret = OK; + + sem_post(&volume->exclsem); +errout: + return ret; +} |