1274876Sbapt#include "config.h" 2274876Sbapt 3275432Sbapt#if HAVE_REALLOCARRAY 4274876Sbapt 5274876Sbaptint dummy; 6274876Sbapt 7274876Sbapt#else 8274876Sbapt 9276219Sbapt/* $Id: compat_reallocarray.c,v 1.4 2014/12/11 09:05:01 schwarze Exp $ */ 10276219Sbapt/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ 11274876Sbapt/* 12274876Sbapt * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> 13274876Sbapt * 14274876Sbapt * Permission to use, copy, modify, and distribute this software for any 15274876Sbapt * purpose with or without fee is hereby granted, provided that the above 16274876Sbapt * copyright notice and this permission notice appear in all copies. 17274876Sbapt * 18274876Sbapt * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 19274876Sbapt * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 20274876Sbapt * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 21274876Sbapt * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22274876Sbapt * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 23274876Sbapt * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 24274876Sbapt * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 25274876Sbapt */ 26276219Sbapt 27274876Sbapt#include <sys/types.h> 28274876Sbapt#include <errno.h> 29274876Sbapt#include <stdint.h> 30274876Sbapt#include <stdlib.h> 31274876Sbapt 32276219Sbapt/* 33276219Sbapt * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX 34276219Sbapt * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW 35276219Sbapt */ 36276219Sbapt#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) 37274876Sbapt 38274876Sbaptvoid * 39274876Sbaptreallocarray(void *optr, size_t nmemb, size_t size) 40274876Sbapt{ 41274876Sbapt if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && 42274876Sbapt nmemb > 0 && SIZE_MAX / nmemb < size) { 43274876Sbapt errno = ENOMEM; 44274876Sbapt return NULL; 45274876Sbapt } 46274876Sbapt return realloc(optr, size * nmemb); 47274876Sbapt} 48274876Sbapt 49274876Sbapt#endif /*!HAVE_REALLOCARRAY*/ 50