/** @file | |
CompareMem() implementation. | |
The following BaseMemoryLib instances contain the same copy of this file: | |
BaseMemoryLib | |
BaseMemoryLibMmx | |
BaseMemoryLibSse2 | |
BaseMemoryLibRepStr | |
BaseMemoryLibOptDxe | |
BaseMemoryLibOptPei | |
PeiMemoryLib | |
UefiMemoryLib | |
Copyright (c) 2006 - 2009, 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. | |
**/ | |
#include "MemLibInternals.h" | |
/** | |
Compares the contents of two buffers. | |
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 Length > 0 and DestinationBuffer is NULL, then ASSERT(). | |
If Length > 0 and SourceBuffer is NULL, 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 Pointer to the destination buffer to compare. | |
@param SourceBuffer Pointer to the source buffer to compare. | |
@param Length Number of bytes to compare. | |
@return 0 All Length bytes of the two buffers are identical. | |
@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first | |
mismatched byte in DestinationBuffer. | |
**/ | |
INTN | |
EFIAPI | |
CompareMem ( | |
IN CONST VOID *DestinationBuffer, | |
IN CONST VOID *SourceBuffer, | |
IN UINTN Length | |
) | |
{ | |
if (Length == 0 || DestinationBuffer == SourceBuffer) { | |
return 0; | |
} | |
ASSERT (DestinationBuffer != NULL); | |
ASSERT (SourceBuffer != NULL); | |
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer)); | |
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer)); | |
return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length); | |
} |