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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Utility functions that need to be built as part of the firmware.
*/
#include "sysincludes.h"
#include "utility.h"
int SafeMemcmp(const void *s1, const void *s2, size_t n) {
const unsigned char *us1 = s1;
const unsigned char *us2 = s2;
int result = 0;
if (0 == n)
return 0;
/*
* Code snippet without data-dependent branch due to Nate Lawson
* (nate@root.org) of Root Labs.
*/
while (n--)
result |= *us1++ ^ *us2++;
return result != 0;
}
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