1/*
2 * Copyright (C) 2013  Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/* $Id$ */
18
19/*! \file */
20
21#include <config.h>
22
23#include <isc/safe.h>
24#include <isc/util.h>
25
26#ifdef _MSC_VER
27#pragma optimize("", off)
28#endif
29
30isc_boolean_t
31isc_safe_memcmp(const void *s1, const void *s2, size_t n) {
32	isc_uint8_t acc = 0;
33
34	if (n != 0U) {
35		const isc_uint8_t *p1 = s1, *p2 = s2;
36
37		do {
38			acc |= *p1++ ^ *p2++;
39		} while (--n != 0U);
40	}
41	return (ISC_TF(acc == 0));
42}
43