Mercurial > irccd
comparison extern/libbsd/reallocarray.c @ 1075:69b90a8d4d35
misc: fix build on macOS
author | David Demelier <markand@malikania.fr> |
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date | Wed, 14 Jul 2021 20:37:27 +0200 |
parents | |
children | 8f26ee9cc6dd |
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1074:4ed442cf25c0 | 1075:69b90a8d4d35 |
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1 /* $OpenBSD: reallocarray.c,v 1.3 2015/09/13 08:31:47 guenther Exp $ */ | |
2 /* | |
3 * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> | |
4 * | |
5 * Permission to use, copy, modify, and distribute this software for any | |
6 * purpose with or without fee is hereby granted, provided that the above | |
7 * copyright notice and this permission notice appear in all copies. | |
8 * | |
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 */ | |
17 | |
18 #include <sys/types.h> | |
19 #include <errno.h> | |
20 #include <stdint.h> | |
21 #include <stdlib.h> | |
22 | |
23 /* | |
24 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX | |
25 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW | |
26 */ | |
27 #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) | |
28 | |
29 void * | |
30 reallocarray(void *optr, size_t nmemb, size_t size) | |
31 { | |
32 if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && | |
33 nmemb > 0 && SIZE_MAX / nmemb < size) { | |
34 errno = ENOMEM; | |
35 return NULL; | |
36 } | |
37 return realloc(optr, size * nmemb); | |
38 } |