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1 8951cb19 2022-07-01 op /*
2 8951cb19 2022-07-01 op * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
3 8951cb19 2022-07-01 op *
4 8951cb19 2022-07-01 op * Permission to use, copy, modify, and distribute this software for any
5 8951cb19 2022-07-01 op * purpose with or without fee is hereby granted, provided that the above
6 8951cb19 2022-07-01 op * copyright notice and this permission notice appear in all copies.
7 8951cb19 2022-07-01 op *
8 8951cb19 2022-07-01 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 8951cb19 2022-07-01 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 8951cb19 2022-07-01 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 8951cb19 2022-07-01 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 8951cb19 2022-07-01 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 8951cb19 2022-07-01 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 8951cb19 2022-07-01 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 8951cb19 2022-07-01 op */
16 8951cb19 2022-07-01 op
17 8951cb19 2022-07-01 op #include <sys/types.h>
18 8951cb19 2022-07-01 op #include <errno.h>
19 8951cb19 2022-07-01 op #include <stdint.h>
20 8951cb19 2022-07-01 op #include <stdlib.h>
21 8951cb19 2022-07-01 op
22 8951cb19 2022-07-01 op /*
23 8951cb19 2022-07-01 op * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
24 8951cb19 2022-07-01 op * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
25 8951cb19 2022-07-01 op */
26 8951cb19 2022-07-01 op #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
27 8951cb19 2022-07-01 op
28 8951cb19 2022-07-01 op void *
29 8951cb19 2022-07-01 op reallocarray(void *optr, size_t nmemb, size_t size)
30 8951cb19 2022-07-01 op {
31 8951cb19 2022-07-01 op if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
32 8951cb19 2022-07-01 op nmemb > 0 && SIZE_MAX / nmemb < size) {
33 8951cb19 2022-07-01 op errno = ENOMEM;
34 8951cb19 2022-07-01 op return NULL;
35 8951cb19 2022-07-01 op }
36 8951cb19 2022-07-01 op return realloc(optr, size * nmemb);
37 8951cb19 2022-07-01 op }