diff options
author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2007-03-14 22:41:09 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2007-03-14 22:41:09 +0000 |
commit | fecf0431f397b50ca503523f4728dba5bcbf45a5 (patch) | |
tree | 9d9bab896ace384c17eb83026921f5e8218bae8c /nuttx/fs/fs_readdir.c | |
parent | a911fb9e5057bac1259ad597fd7af570d60bb12a (diff) |
Added opendir, readdir, closedir, etc.
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@62 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/fs/fs_readdir.c')
-rw-r--r-- | nuttx/fs/fs_readdir.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/nuttx/fs/fs_readdir.c b/nuttx/fs/fs_readdir.c new file mode 100644 index 0000000000..40f4f1747b --- /dev/null +++ b/nuttx/fs/fs_readdir.c @@ -0,0 +1,145 @@ +/************************************************************ + * fs_readdir.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> +#include <string.h> +#include <dirent.h> +#include <errno.h> +#include <nuttx/fs.h> +#include "fs_internal.h" + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Name: readdir + * + * Description: + * The readdir() function returns a pointer to a dirent + * structure representing the next directory entry in the + * directory stream pointed to by dir. It returns NULL on + * reaching the end-of-file or if an error occurred. + * + * Inputs: + * dirp -- An instance of type DIR created by a previous + * call to opendir(); + * + * Return: + * The readdir() function returns a pointer to a dirent + * structure, or NULL if an error occurs or end-of-file + * is reached. On error, errno is set appropriately. + * + * EBADF - Invalid directory stream descriptor dir + * + ************************************************************/ + +#if CONFIG_NFILE_DESCRIPTORS > 0 + +FAR struct dirent *readdir(DIR *dirp) +{ + FAR struct internal_dir_s *idir = (struct internal_dir_s *)dirp; + FAR struct inode *prev; + + if (!idir) + { + *get_errno_ptr() = EBADF; + return NULL; + } + + /* Check if we are at the end of the list */ + + if (!idir->next) + { + return NULL; + } + + /* Copy the inode name into the dirent structure */ + + strncpy(idir->dir.d_name, idir->next->i_name, NAME_MAX+1); + + /* If the node has file operations, we will say that it is + * a file. + */ + + idir->dir.d_type = 0; + if (idir->next->i_ops) + { + idir->dir.d_type |= DTYPE_FILE; + } + + /* If the node has child node(s), then we will say that it + * is a directory. NOTE: that the node can be both! + */ + + if (idir->next->i_child || !idir->next->i_ops) + { + idir->dir.d_type |= DTYPE_FILE; + } + + /* Now get the inode to vist next time that readdir() is called */ + + inode_semtake(); + + prev = idir->next; + idir->next = prev->i_peer; /* The next node to visit */ + + if (idir->next) + { + /* Increment the reference count on this next node */ + + idir->next->i_crefs++; + } + + inode_semgive(); + + if (prev) + { + inode_release(prev); + } + + return &idir->dir; +} + +#endif /* CONFIG_NFILE_DESCRIPTORS */ |