1285031Sdes/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ 2285031Sdes/* 3285031Sdes * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> 4285031Sdes * 5285031Sdes * Permission to use, copy, modify, and distribute this software for any 6285031Sdes * purpose with or without fee is hereby granted, provided that the above 7285031Sdes * copyright notice and this permission notice appear in all copies. 8285031Sdes * 9285031Sdes * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10285031Sdes * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11285031Sdes * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12285031Sdes * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13285031Sdes * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14285031Sdes * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15285031Sdes * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16285031Sdes */ 17285031Sdes 18285031Sdes/* OPENBSD ORIGINAL: lib/libc/stdlib/reallocarray.c */ 19285031Sdes 20285031Sdes#include "includes.h" 21285031Sdes#ifndef HAVE_REALLOCARRAY 22285031Sdes 23285031Sdes#include <sys/types.h> 24285031Sdes#include <errno.h> 25285031Sdes#ifdef HAVE_STDINT_H 26285031Sdes#include <stdint.h> 27285031Sdes#endif 28285031Sdes#include <stdlib.h> 29285031Sdes 30285031Sdes/* 31285031Sdes * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX 32285031Sdes * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW 33285031Sdes */ 34285031Sdes#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) 35285031Sdes 36285031Sdesvoid * 37285031Sdesreallocarray(void *optr, size_t nmemb, size_t size) 38285031Sdes{ 39285031Sdes if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && 40285031Sdes nmemb > 0 && SIZE_MAX / nmemb < size) { 41285031Sdes errno = ENOMEM; 42285031Sdes return NULL; 43285031Sdes } 44285031Sdes return realloc(optr, size * nmemb); 45285031Sdes} 46285031Sdes#endif /* HAVE_REALLOCARRAY */ 47