mirror of
https://git.proxmox.com/git/mirror_edk2
synced 2025-11-04 01:03:23 +00:00
373ade0eb6
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7148 6f19259b-4bc3-4df7-8a09-765794883524
68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/** @file
|
|
CompareMem() implementation.
|
|
|
|
The following BaseMemoryLib instances contain the same copy of this file:
|
|
|
|
BaseMemoryLib
|
|
BaseMemoryLibMmx
|
|
BaseMemoryLibSse2
|
|
BaseMemoryLibRepStr
|
|
BaseMemoryLibOptDxe
|
|
BaseMemoryLibOptPei
|
|
PeiMemoryLib
|
|
DxeMemoryLib
|
|
|
|
Copyright (c) 2006 - 2008, Intel Corporation
|
|
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);
|
|
}
|