MdePkg/Library/BaseMemoryLib/CompareMemWrapper.c File Reference


Functions

INTN EFIAPI CompareMem (IN CONST VOID *DestinationBuffer, IN CONST VOID *SourceBuffer, IN UINTN Length)

Detailed Description

CompareMem() implementation.

The following BaseMemoryLib instances contain the same copy of this file: BaseMemoryLib BaseMemoryLibMmx BaseMemoryLibSse2 BaseMemoryLibRepStr BaseMemoryLibOptDxe BaseMemoryLibOptPei PeiMemoryLib UefiMemoryLib

Copyright (c) 2006 - 2010, 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.


Function Documentation

INTN EFIAPI CompareMem ( IN CONST VOID *  DestinationBuffer,
IN CONST VOID *  SourceBuffer,
IN UINTN  Length 
)

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().

Parameters:
DestinationBuffer A pointer to the destination buffer to compare.
SourceBuffer A pointer to the source buffer to compare.
Length The number of bytes to compare.
Returns:
0 All Length bytes of the two buffers are identical.
Return values:
Non-zero The first mismatched byte in SourceBuffer subtracted from the first mismatched byte in DestinationBuffer.

References ASSERT, InternalMemCompareMem(), MAX_ADDRESS, and NULL.


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