safe.c revision f4e309b17743e86c15cdb5960da51f684a1f4a6f
/*
* Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/* $Id$ */
/*! \file */
#include <config.h>
#include <isc/safe.h>
#include <isc/util.h>
#ifdef _MSC_VER
#pragma optimize("", off)
#endif
isc_boolean_t
isc_safe_memcmp(const void *s1, const void *s2, size_t n) {
isc_uint8_t acc = 0;
if (n != 0U) {
const isc_uint8_t *p1 = s1, *p2 = s2;
do {
acc |= *p1++ ^ *p2++;
} while (--n != 0U);
}
return (ISC_TF(acc == 0));
}