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reallocarray.c (1306B) | |
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1 /* | |
2 * Copyright (c) 2008 Otto Moerbeek <[email protected]> | |
3 * | |
4 * Permission to use, copy, modify, and distribute this software for any | |
5 * purpose with or without fee is hereby granted, provided that the above | |
6 * copyright notice and this permission notice appear in all copies. | |
7 * | |
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANT… | |
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE F… | |
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT … | |
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 */ | |
16 | |
17 #include <sys/types.h> | |
18 #include <errno.h> | |
19 #include <stdint.h> | |
20 #include <stdlib.h> | |
21 | |
22 #include "compat.h" | |
23 | |
24 /* | |
25 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX | |
26 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW | |
27 */ | |
28 #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4)) | |
29 | |
30 void * | |
31 reallocarray(void *optr, size_t nmemb, size_t size) | |
32 { | |
33 if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && | |
34 nmemb > 0 && SIZE_MAX / nmemb < size) { | |
35 errno = ENOMEM; | |
36 return NULL; | |
37 } | |
38 return realloc(optr, size * nmemb); | |
39 } |