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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2019 Keith Packard
*
* 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 of the copyright holder 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 HOLDER 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.
*/
#include "stdio_private.h"
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
FILE *
freopen(const char *pathname, const char *mode, FILE *stream)
{
struct __file_bufio *pf = (struct __file_bufio *) stream;
int fd;
int stdio_flags;
int open_flags;
/* Can't reopen FILEs which aren't buffered */
if (!(stream->flags & __SBUF))
return NULL;
stdio_flags = __posix_sflags(mode, &open_flags);
if (stdio_flags == 0)
return NULL;
fd = open(pathname, open_flags, 0666);
if (fd < 0)
return NULL;
fflush(stream);
__bufio_lock(stream);
close(pf->fd);
stream->flags = (stream->flags & ~(__SRD|__SWR|__SERR|__SEOF)) | stdio_flags;
pf->pos = 0;
pf->fd = fd;
/* Switch to POSIX backend */
pf->read = read;
pf->write = write;
pf->lseek = lseek;
pf->close = close;
__bufio_unlock(stream);
return stream;
}
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