Annotation of mandoc/compat_reallocarray.c, Revision 1.5
1.5 ! schwarze 1: /* $Id: compat_reallocarray.c,v 1.4 2014/12/11 09:05:01 schwarze Exp $ */
! 2: /* $OpenBSD: reallocarray.c,v 1.3 2015/09/13 08:31:47 guenther Exp $ */
1.1 schwarze 3: /*
4: * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
1.5 ! schwarze 18: #include "config.h"
1.4 schwarze 19:
1.1 schwarze 20: #include <sys/types.h>
21: #include <errno.h>
22: #include <stdint.h>
23: #include <stdlib.h>
24:
1.4 schwarze 25: /*
26: * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
27: * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
28: */
29: #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
1.1 schwarze 30:
31: void *
32: reallocarray(void *optr, size_t nmemb, size_t size)
33: {
34: if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
35: nmemb > 0 && SIZE_MAX / nmemb < size) {
36: errno = ENOMEM;
37: return NULL;
38: }
39: return realloc(optr, size * nmemb);
40: }
CVSweb