d8df31f3d8
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@218 42af7a65-404d-4744-a932-0658087f49c3
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/************************************************************
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* fs_inodefinddir.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 <errno.h>
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#include <nuttx/fs.h>
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#include "fs_internal.h"
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#if CONFIG_NFILE_DESCRIPTORS >0
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Variables
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************************************************************/
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/************************************************************
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* Public Variables
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************************************************************/
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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: inode_finddir
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*
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* Description:
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* This is called from the opendir() logic to get a reference
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* to the inode associated with a directory. There are no
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* real directories in this design; For our purposes, a
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* directory inode is simply one that has children.
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*
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************************************************************/
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FAR struct inode *inode_finddir(const char *path)
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{
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FAR struct inode *node;
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FAR struct inode *child = NULL;
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/* If we are given 'nothing' then we will interpret this as
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* request for the root inode.
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*/
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if (!path || *path == 0 || strcmp(path, "/") == 0)
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{
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return root_inode;
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}
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/* We don't know what to do with relative pathes */
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if (*path != '/')
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{
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return NULL;
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}
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/* Find the node matching the path. */
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inode_semtake();
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/* Handle some special cases */
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node = inode_search(&path, (FAR void*)NULL, (FAR void*)NULL, (FAR const char**)NULL);
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if (node)
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{
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/* Does the inode have a child? If so that the child
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* would be the 'head' of a list of nodes under the
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* directory.
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*/
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child = node->i_child;
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if (child)
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{
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/* If found, then increment the count of
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* references on the child node.
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*/
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child->i_crefs++;
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}
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}
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inode_semgive();
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return child;
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS */
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