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/****************************************************************************
* lib/lib_fopen.c
*
* Copyright (C) 2007, 2008 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.
*
****************************************************************************/
/****************************************************************************
* Compilation Switches
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.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
****************************************************************************/
static int lib_mode2oflags(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;
mode++;
}
else
{
/* Write to the end of the file */
oflags |= O_WROK|O_CREAT;
}
break;
/* Open for binary access? */
case 'b' :
default:
break;
}
mode++;
}
}
return oflags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
FAR struct file_struct *lib_fdopen(int fd, const char *mode,
FAR struct filelist *flist,
FAR struct streamlist *slist)
{
FAR struct inode *inode = flist->fl_files[fd].f_inode;
FILE *stream;
int oflags = lib_mode2oflags(mode);
int err;
int i;
if (fd < 0 || !flist || !slist)
{
err = EBADF;
goto errout;
}
/* Make sure that the inode supports the requested access. In
* the case of fdopen, we are not actually creating the file -- in
* particular w and w+ do not truncate the file and any files have
* already been created.
*/
if (inode_checkflags(inode, oflags) != OK)
{
err = EACCES;
goto errout;
}
/* Find an unallocated FILE structure */
stream_semtake(slist);
for (i = 0 ; i < CONFIG_NFILE_STREAMS; i++)
{
stream = &slist->sl_streams[i];
if (stream->fs_filedes < 0)
{
/* Zero the structure */
#if CONFIG_STDIO_BUFFER_SIZE > 0
memset(stream, 0, sizeof(FILE));
#elif CONFIG_NUNGET_CHARS > 0
stream->fs_nungotten = 0;
#endif
#if CONFIG_STDIO_BUFFER_SIZE > 0
/* Initialize the semaphore the manages access to the buffer */
(void)sem_init(&stream->fs_sem, 0, 1);
/* Allocate the IO buffer */
stream->fs_bufstart = malloc(CONFIG_STDIO_BUFFER_SIZE);
if (!stream)
{
err = ENOMEM;
goto errout_with_sem;
}
/* Set up pointers */
stream->fs_bufend = &stream->fs_bufstart[CONFIG_STDIO_BUFFER_SIZE];
stream->fs_bufpos = stream->fs_bufstart;
stream->fs_bufpos = stream->fs_bufstart;
stream->fs_bufread = stream->fs_bufstart;
#endif
/* Save the file description and open flags. Setting the
* file descriptor locks this stream.
*/
stream->fs_filedes = fd;
stream->fs_oflags = oflags;
stream_semgive(slist);
return stream;
}
}
errout_with_sem:
stream_semgive(slist);
errout:
*get_errno_ptr() = err;
return NULL;
}
FILE *fdopen(int fd, const char *mode)
{
FAR struct filelist *flist = sched_getfiles();
FAR struct streamlist *slist = sched_getstreams();
return lib_fdopen(fd, mode, flist, slist);
}
FILE *fopen(const char *path, const char *mode)
{
FAR struct filelist *flist = sched_getfiles();
FAR struct streamlist *slist = sched_getstreams();
int oflags = lib_mode2oflags(mode);
int fd = open(path, oflags, 0666);
FILE *ret = lib_fdopen(fd, mode, flist, slist);
if (!ret)
{
(void)close(fd);
}
return ret;
}
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