Annotation of mandoc/compat_reallocarray.c, Revision 1.3
1.1 schwarze 1: #include "config.h"
2:
1.3 ! schwarze 3: #if HAVE_REALLOCARRAY
1.1 schwarze 4:
5: int dummy;
6:
7: #else
8:
9: /* $OpenBSD: malloc.c,v 1.158 2014/04/23 15:07:27 tedu Exp $ */
10: /*
11: * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
12: *
13: * Permission to use, copy, modify, and distribute this software for any
14: * purpose with or without fee is hereby granted, provided that the above
15: * copyright notice and this permission notice appear in all copies.
16: *
17: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
18: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
19: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
20: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
21: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
22: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
23: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24: */
25: #include <sys/types.h>
26: #include <errno.h>
27: #include <stdint.h>
28: #include <stdlib.h>
29:
30: #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
31:
32: void *
33: reallocarray(void *optr, size_t nmemb, size_t size)
34: {
35: if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
36: nmemb > 0 && SIZE_MAX / nmemb < size) {
37: errno = ENOMEM;
38: return NULL;
39: }
40: return realloc(optr, size * nmemb);
41: }
42:
43: #endif /*!HAVE_REALLOCARRAY*/
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