1*00b67f09SDavid van Moolenbroek /* $NetBSD: safe.c,v 1.3 2014/12/10 04:37:59 christos Exp $ */
2*00b67f09SDavid van Moolenbroek
3*00b67f09SDavid van Moolenbroek /*
4*00b67f09SDavid van Moolenbroek * Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
5*00b67f09SDavid van Moolenbroek *
6*00b67f09SDavid van Moolenbroek * Permission to use, copy, modify, and/or distribute this software for any
7*00b67f09SDavid van Moolenbroek * purpose with or without fee is hereby granted, provided that the above
8*00b67f09SDavid van Moolenbroek * copyright notice and this permission notice appear in all copies.
9*00b67f09SDavid van Moolenbroek *
10*00b67f09SDavid van Moolenbroek * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
11*00b67f09SDavid van Moolenbroek * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
12*00b67f09SDavid van Moolenbroek * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
13*00b67f09SDavid van Moolenbroek * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
14*00b67f09SDavid van Moolenbroek * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
15*00b67f09SDavid van Moolenbroek * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16*00b67f09SDavid van Moolenbroek * PERFORMANCE OF THIS SOFTWARE.
17*00b67f09SDavid van Moolenbroek */
18*00b67f09SDavid van Moolenbroek
19*00b67f09SDavid van Moolenbroek /* Id */
20*00b67f09SDavid van Moolenbroek
21*00b67f09SDavid van Moolenbroek /*! \file */
22*00b67f09SDavid van Moolenbroek
23*00b67f09SDavid van Moolenbroek #include <config.h>
24*00b67f09SDavid van Moolenbroek
25*00b67f09SDavid van Moolenbroek #include <isc/safe.h>
26*00b67f09SDavid van Moolenbroek #include <isc/util.h>
27*00b67f09SDavid van Moolenbroek
28*00b67f09SDavid van Moolenbroek #ifdef _MSC_VER
29*00b67f09SDavid van Moolenbroek #pragma optimize("", off)
30*00b67f09SDavid van Moolenbroek #endif
31*00b67f09SDavid van Moolenbroek
32*00b67f09SDavid van Moolenbroek isc_boolean_t
isc_safe_memcmp(const void * s1,const void * s2,size_t n)33*00b67f09SDavid van Moolenbroek isc_safe_memcmp(const void *s1, const void *s2, size_t n) {
34*00b67f09SDavid van Moolenbroek isc_uint8_t acc = 0;
35*00b67f09SDavid van Moolenbroek
36*00b67f09SDavid van Moolenbroek if (n != 0U) {
37*00b67f09SDavid van Moolenbroek const isc_uint8_t *p1 = s1, *p2 = s2;
38*00b67f09SDavid van Moolenbroek
39*00b67f09SDavid van Moolenbroek do {
40*00b67f09SDavid van Moolenbroek acc |= *p1++ ^ *p2++;
41*00b67f09SDavid van Moolenbroek } while (--n != 0U);
42*00b67f09SDavid van Moolenbroek }
43*00b67f09SDavid van Moolenbroek return (ISC_TF(acc == 0));
44*00b67f09SDavid van Moolenbroek }
45