X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseMemoryLib%2FCompareMemWrapper.c;h=d30d8698c4ca893d3a173fec8ca3aa40be14c669;hb=32eb6739b961a5b4cc204b94220fa5ad15f79a9b;hp=b6f852cdf122e916920170e27fee8d78f5ac41a2;hpb=f734a10ab104f1072f94cab66a5489e0fd8fce8a;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseMemoryLib/CompareMemWrapper.c b/MdePkg/Library/BaseMemoryLib/CompareMemWrapper.c
index b6f852cdf1..d30d8698c4 100644
--- a/MdePkg/Library/BaseMemoryLib/CompareMemWrapper.c
+++ b/MdePkg/Library/BaseMemoryLib/CompareMemWrapper.c
@@ -1,32 +1,26 @@
 /** @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:
-
+  The following BaseMemoryLib instances contain the same copy of this file:
     BaseMemoryLib
     BaseMemoryLibMmx
     BaseMemoryLibSse2
     BaseMemoryLibRepStr
+    BaseMemoryLibOptDxe
+    BaseMemoryLibOptPei
     PeiMemoryLib
-    DxeMemoryLib
+    UefiMemoryLib
 
-**/
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+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.
 
-//
-// Include common header file for this module.
-//
+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"
 
@@ -37,15 +31,15 @@
   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 and Length > 0, then ASSERT().
-  If Length > 0 and 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(). 
 
+  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.
+  @param  DestinationBuffer A pointer to the destination buffer to compare.
+  @param  SourceBuffer      A pointer to the source buffer to compare.
+  @param  Length            The 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
@@ -60,7 +54,7 @@ CompareMem (
   IN UINTN       Length
   )
 {
-  if (Length == 0) {
+  if (Length == 0 || DestinationBuffer == SourceBuffer) {
     return 0;
   }
   ASSERT (DestinationBuffer != NULL);