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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2020 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"
char * __disable_sanitizer
vasnprintf(char *str, size_t *lenp, const char *fmt, va_list ap)
{
struct __file_str f = FDEV_SETUP_STRING_ALLOC_BUF(str, *lenp);
int i;
i = vfprintf(&f.file, fmt, ap);
/*
* Use fputc to append a NULL to handle
* buffer overflow cases
*/
if (i >= 0) {
if (fputc('\0', &f.file) < 0)
i = EOF;
}
char *ret = POINTER_MINUS(f.end, f.size);
if (i >= 0) {
*lenp = (size_t)i;
/* Try to shrink the buffer */
if (f.alloc) {
char *s = realloc(ret, i + 1);
if (s)
ret = s;
}
} else {
if (f.alloc)
free(ret);
ret = NULL;
}
return ret;
}
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