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https://github.com/Telecominfraproject/OpenCellular.git
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a3454fcaa4
Also fixes returned value from Memset(). And SafeMemcmp() should return 0 (equal) if comparing 0 bytes, to match the behavior of memcmp(). BUG=chromium-os:17564 TEST=make && make runtests Change-Id: Id43e70eecf04815216e1fd952271af35e0a66396 Reviewed-on: http://gerrit.chromium.org/gerrit/6539 Reviewed-by: Stefan Reinauer <reinauer@google.com> Reviewed-by: Bill Richardson <wfrichar@chromium.org> Tested-by: Randall Spangler <rspangler@chromium.org>
34 lines
818 B
C
34 lines
818 B
C
/* Copyright (c) 2011 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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void* Memset(void* d, const uint8_t c, uint64_t n) {
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uint8_t* dest = d; /* the only way to keep both cl and gcc happy */
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while (n--) {
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*dest++ = c;
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}
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return d;
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}
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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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/* Code snippet without data-dependent branch due to
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* Nate Lawson (nate@root.org) of Root Labs. */
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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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