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				/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */
				/*
				* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
				*
				* Permission to use, copy, modify, and distribute this software for any
				* purpose with or without fee is hereby granted, provided that the above
				* copyright notice and this permission notice appear in all copies.
				*
				* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
				* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
				* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
				* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
				* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
				* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
				* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
				*/

				#include <sys/types.h>
				#include <errno.h>
				#include <stdint.h>
				#include <stdlib.h>

				#include "config.h"

				#ifndef HAVE_REALLOCARRAY

				/*
				* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
				* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
				*/
				#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))

				void *
				reallocarray(void *optr, size_t nmemb, size_t size)
				{
				if ((nmemb >= MUL_NO_OVERFLOW \|\| size >= MUL_NO_OVERFLOW) &&
				nmemb > 0 && SIZE_MAX / nmemb < size) {
				errno = ENOMEM;
				return NULL;
				}
				return realloc(optr, size * nmemb);
				}

				#endif /* !HAVE_REALLOCARRAY */