mirror of https://github.com/acidanthera/audk.git
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
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/** @file
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CompareMem() implementation.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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The following BaseMemoryLib instances share the same version of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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PeiMemoryLib
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DxeMemoryLib
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**/
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#include "MemLibInternals.h"
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/**
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Compares the contents of two buffers.
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This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer.
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If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the
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value returned is the first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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If Length > 0 and DestinationBuffer is NULL and Length > 0, then ASSERT().
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If Length > 0 and SourceBuffer is NULL and Length > 0, then ASSERT().
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If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().
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If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().
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@param DestinationBuffer Pointer to the destination buffer to compare.
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@param SourceBuffer Pointer to the source buffer to compare.
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@param Length Number of bytes to compare.
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@return 0 All Length bytes of the two buffers are identical.
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@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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**/
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INTN
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EFIAPI
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CompareMem (
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IN CONST VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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)
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{
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if (Length == 0) {
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return 0;
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}
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ASSERT (DestinationBuffer != NULL);
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ASSERT (SourceBuffer != NULL);
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));
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return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length);
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}
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