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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2026 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"
int
__bufio_setvbuf(FILE *f, char *buf, int mode, size_t size)
{
struct __file_bufio *bf = (struct __file_bufio *)f;
int ret = -1;
__bufio_lock(f);
if (__bufio_flush_locked(f) < 0) {
ret = _FDEV_ERR;
goto bail;
}
bf->bflags &= ~__BLBF;
switch (mode) {
case _IONBF:
buf = NULL;
size = 1;
break;
case _IOLBF:
bf->bflags |= __BLBF;
break;
case _IOFBF:
break;
default:
goto bail;
}
if (bf->bflags & __BALL) {
if (buf) {
free(bf->buf);
bf->bflags &= ~__BALL;
} else {
/*
* Handling allocation failures here is a bit tricky;
* we don't want to lose the existing buffer. Instead,
* we try to reallocate it
*/
buf = realloc(bf->buf, size);
if (!buf)
goto bail;
}
} else if (!buf) {
buf = malloc(size);
if (!buf)
goto bail;
bf->bflags |= __BALL;
}
if (bf->bflags & __BALL)
bf->xfile.cfile.close = __bufio_close;
bf->buf = buf;
bf->size = size;
ret = 0;
bail:
__bufio_unlock(f);
return ret;
}
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