1#include "config.h"
2
3#if HAVE_REALLOCARRAY
4
5int dummy;
6
7#else
8
9/*	$Id: compat_reallocarray.c,v 1.4 2014/12/11 09:05:01 schwarze Exp $	*/
10/*	$OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $	*/
11/*
12 * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
13 *
14 * Permission to use, copy, modify, and distribute this software for any
15 * purpose with or without fee is hereby granted, provided that the above
16 * copyright notice and this permission notice appear in all copies.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
19 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
21 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
23 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
24 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 */
26
27#include <sys/types.h>
28#include <errno.h>
29#include <stdint.h>
30#include <stdlib.h>
31
32/*
33 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
34 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
35 */
36#define MUL_NO_OVERFLOW	((size_t)1 << (sizeof(size_t) * 4))
37
38void *
39reallocarray(void *optr, size_t nmemb, size_t size)
40{
41	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
42	    nmemb > 0 && SIZE_MAX / nmemb < size) {
43		errno = ENOMEM;
44		return NULL;
45	}
46	return realloc(optr, size * nmemb);
47}
48
49#endif /*!HAVE_REALLOCARRAY*/
50