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