1 dd038bc6 2021-09-21 thomas.ad /*	$OpenBSD: reallocarray.c,v 1.3 2015/09/13 08:31:47 guenther Exp $	*/
 2 dd038bc6 2021-09-21 thomas.ad /*
 3 dd038bc6 2021-09-21 thomas.ad  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
 4 dd038bc6 2021-09-21 thomas.ad  *
 5 dd038bc6 2021-09-21 thomas.ad  * Permission to use, copy, modify, and distribute this software for any
 6 dd038bc6 2021-09-21 thomas.ad  * purpose with or without fee is hereby granted, provided that the above
 7 dd038bc6 2021-09-21 thomas.ad  * copyright notice and this permission notice appear in all copies.
 8 dd038bc6 2021-09-21 thomas.ad  *
 9 dd038bc6 2021-09-21 thomas.ad  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 dd038bc6 2021-09-21 thomas.ad  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 dd038bc6 2021-09-21 thomas.ad  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 dd038bc6 2021-09-21 thomas.ad  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 dd038bc6 2021-09-21 thomas.ad  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 dd038bc6 2021-09-21 thomas.ad  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 dd038bc6 2021-09-21 thomas.ad  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 dd038bc6 2021-09-21 thomas.ad  */
17 dd038bc6 2021-09-21 thomas.ad 
18 dd038bc6 2021-09-21 thomas.ad #include <sys/types.h>
19 dd038bc6 2021-09-21 thomas.ad #include <errno.h>
20 dd038bc6 2021-09-21 thomas.ad #include <stdint.h>
21 dd038bc6 2021-09-21 thomas.ad #include <stdlib.h>
22 dd038bc6 2021-09-21 thomas.ad 
23 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
24 dd038bc6 2021-09-21 thomas.ad 
25 dd038bc6 2021-09-21 thomas.ad /*
26 dd038bc6 2021-09-21 thomas.ad  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
27 dd038bc6 2021-09-21 thomas.ad  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
28 dd038bc6 2021-09-21 thomas.ad  */
29 dd038bc6 2021-09-21 thomas.ad #define MUL_NO_OVERFLOW	((size_t)1 << (sizeof(size_t) * 4))
30 dd038bc6 2021-09-21 thomas.ad 
31 dd038bc6 2021-09-21 thomas.ad void *
32 dd038bc6 2021-09-21 thomas.ad reallocarray(void *optr, size_t nmemb, size_t size)
33 dd038bc6 2021-09-21 thomas.ad {
34 dd038bc6 2021-09-21 thomas.ad 	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
35 dd038bc6 2021-09-21 thomas.ad 	    nmemb > 0 && SIZE_MAX / nmemb < size) {
36 dd038bc6 2021-09-21 thomas.ad 		errno = ENOMEM;
37 dd038bc6 2021-09-21 thomas.ad 		return NULL;
38 dd038bc6 2021-09-21 thomas.ad 	}
39 dd038bc6 2021-09-21 thomas.ad 	return realloc(optr, size * nmemb);
40 dd038bc6 2021-09-21 thomas.ad }