146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/************************************************************
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* fs_readdir.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "fs_internal.h"
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Name: readdir
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*
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* Description:
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* The readdir() function returns a pointer to a dirent
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* structure representing the next directory entry in the
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* directory stream pointed to by dir. It returns NULL on
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* reaching the end-of-file or if an error occurred.
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*
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* Inputs:
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* dirp -- An instance of type DIR created by a previous
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* call to opendir();
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*
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* Return:
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* The readdir() function returns a pointer to a dirent
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* structure, or NULL if an error occurs or end-of-file
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* is reached. On error, errno is set appropriately.
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*
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* EBADF - Invalid directory stream descriptor dir
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*
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************************************************************/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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FAR struct dirent *readdir(DIR *dirp)
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{
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FAR struct internal_dir_s *idir = (struct internal_dir_s *)dirp;
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FAR struct inode *prev;
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if (!idir)
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{
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*get_errno_ptr() = EBADF;
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return NULL;
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}
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/* Check if we are at the end of the list */
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if (!idir->next)
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{
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return NULL;
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}
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/* Copy the inode name into the dirent structure */
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strncpy(idir->dir.d_name, idir->next->i_name, NAME_MAX+1);
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/* If the node has file operations, we will say that it is
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* a file.
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*/
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idir->dir.d_type = 0;
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if (idir->next->i_ops)
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{
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idir->dir.d_type |= DTYPE_FILE;
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}
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/* If the node has child node(s), then we will say that it
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* is a directory. NOTE: that the node can be both!
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*/
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if (idir->next->i_child || !idir->next->i_ops)
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{
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idir->dir.d_type |= DTYPE_DIRECTORY;
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}
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/* Now get the inode to vist next time that readdir() is called */
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inode_semtake();
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prev = idir->next;
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idir->next = prev->i_peer; /* The next node to visit */
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if (idir->next)
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{
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/* Increment the reference count on this next node */
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idir->next->i_crefs++;
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}
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inode_semgive();
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if (prev)
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{
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inode_release(prev);
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}
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return &idir->dir;
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS */
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