/****************************************************************************
* lib/stdio/lib_fopen.c
*
* Copyright (C) 2007-2011 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 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "lib_internal.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lib_mode2oflags
****************************************************************************/
static int lib_mode2oflags(FAR const char *mode)
{
int oflags = 0;
if (mode)
{
while(*mode)
{
switch (*mode)
{
/* Open for read access */
case 'r' :
if (*(mode + 1) == '+')
{
/* Open for read/write access */
oflags |= O_RDWR;
mode++;
}
else
{
/* Open for read access */
oflags |= O_RDOK;
}
break;
/* Open for write access? */
case 'w' :
if (*(mode + 1) == '+')
{
/* Open for write read/access, truncating any existing file */
oflags |= O_RDWR|O_CREAT|O_TRUNC;
mode++;
}
else
{
/* Open for write access, truncating any existing file */
oflags |= O_WROK|O_CREAT|O_TRUNC;
}
break;
/* Open for write/append access? */
case 'a' :
if (*(mode + 1) == '+')
{
/* Read from the beginning of the file; write to the end */
oflags |= O_RDWR|O_CREAT|O_APPEND;
mode++;
}
else
{
/* Write to the end of the file */
oflags |= O_WROK|O_CREAT|O_APPEND;
}
break;
/* Open for binary access? */
case 'b' :
default:
break;
}
mode++;
}
}
return oflags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: fdopen
****************************************************************************/
FAR FILE *fdopen(int fd, FAR const char *mode)
{
return fs_fdopen(fd, lib_mode2oflags(mode), NULL);
}
/****************************************************************************
* Name: fopen
****************************************************************************/
FAR FILE *fopen(FAR const char *path, FAR const char *mode)
{
FAR FILE *ret = NULL;
int oflags;
int fd;
/* Open the file */
oflags = lib_mode2oflags(mode);
fd = open(path, oflags, 0666);
/* If the open was successful, then fdopen() the fil using the file
* desciptor returned by open. If open failed, then just return the
* NULL stream -- open() has already set the errno.
*/
if (fd >= 0)
{
ret = fs_fdopen(fd, oflags, NULL);
if (!ret)
{
/* Don't forget to close the file descriptor if any other
* failures are reported by fdopen().
*/
(void)close(fd);
}
}
return ret;
}
