1 #include "config.h" 2 3 #if HAVE_REALLOCARRAY 4 5 int dummy; 6 7 #else 8 9 /* $Id: compat_reallocarray.c,v 1.4 2014/12/11 09:05:01 schwarze Exp $ */ 10 /* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ 11 /* 12 * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> 13 * 14 * Permission to use, copy, modify, and distribute this software for any 15 * purpose with or without fee is hereby granted, provided that the above 16 * copyright notice and this permission notice appear in all copies. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 19 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 20 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 21 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 23 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 24 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 25 */ 26 27 #include <sys/types.h> 28 #include <errno.h> 29 #include <stdint.h> 30 #include <stdlib.h> 31 32 /* 33 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX 34 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW 35 */ 36 #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) 37 38 void * 39 reallocarray(void *optr, size_t nmemb, size_t size) 40 { 41 if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && 42 nmemb > 0 && SIZE_MAX / nmemb < size) { 43 errno = ENOMEM; 44 return NULL; 45 } 46 return realloc(optr, size * nmemb); 47 } 48 49 #endif /*!HAVE_REALLOCARRAY*/ 50