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