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