forked from Archive/PX4-Autopilot
123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/****************************************************************************
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* lib/dirent/lib_readdirr.c
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*
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* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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 <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include <nuttx/fs/fs.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_r
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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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* entry -- The storage pointed to by entry must be large
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* enough for a dirent with an array of char d_name
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* members containing at least {NAME_MAX}+1 elements.
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* result -- Upon successful return, the pointer returned
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* at *result shall have the same value as the
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* argument entry. Upon reaching the end of the directory
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* stream, this pointer shall have the value NULL.
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*
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* Return:
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* If successful, the readdir_r() function return s zero;
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* otherwise, an error number is returned to indicate the
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* error.
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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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int readdir_r(FAR DIR *dirp, FAR struct dirent *entry,
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FAR struct dirent **result)
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{
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struct dirent *tmp;
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/* NOTE: The following use or errno is *not* thread-safe */
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set_errno(0);
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tmp = readdir(dirp);
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if (!tmp)
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{
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int error = get_errno();
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if (!error)
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{
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if (result)
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{
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*result = NULL;
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}
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return 0;
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}
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else
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{
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return error;
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}
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}
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if (entry)
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{
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memcpy(entry, tmp, sizeof(struct dirent));
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}
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if (result)
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{
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*result = entry;
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}
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return 0;
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}
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