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