1 #include "config.h"
2
3 #if HAVE_REALLOCARRAY
4
5 int 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
38 void *
reallocarray(void * optr,size_t nmemb,size_t size)39 reallocarray(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