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	reallocarray.c - sbase - suckless unix tools
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	---
	reallocarray.c (1617B)
	---
	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 "../util.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 }
	40
	41 void *
	42 ereallocarray(void *optr, size_t nmemb, size_t size)
	43 {
	44 return enreallocarray(1, optr, nmemb, size);
	45 }
	46
	47 void *
	48 enreallocarray(int status, void *optr, size_t nmemb, size_t size)
	49 {
	50 void *p;
	51
	52 if (!(p = reallocarray(optr, nmemb, size)))
	53 enprintf(status, "reallocarray: out of memory\n");
	54
	55 return p;
	56 }