mirror of https://github.com/acidanthera/audk.git
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*++
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Copyright (c) 2004, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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EfiCompareMem.c
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Abstract:
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Generic compare-memory routine.
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--*/
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#include "Tiano.h"
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#include "EfiDriverLib.h"
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INTN
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EfiCompareMem (
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IN VOID *MemOne,
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IN VOID *MemTwo,
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IN UINTN Length
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)
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/*++
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Routine Description:
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Compares two memory buffers of a given length.
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Arguments:
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MemOne - First memory buffer
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MemTwo - Second memory buffer
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Len - Length of Mem1 and Mem2 memory regions to compare
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Returns:
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= 0 if MemOne == MemTwo
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--*/
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{
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INTN ReturnValue;
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if (!(EFI_UINTN_ALIGNED (MemOne) || EFI_UINTN_ALIGNED (MemTwo) || EFI_UINTN_ALIGNED (Length))) {
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//
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// If Destination/Source/Length are aligned do UINTN conpare
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//
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for (; Length > 0; Length -= sizeof (INTN), MemOne = (VOID *)((UINTN)MemOne + sizeof (INTN)), MemTwo = (VOID *)((UINTN)MemTwo + sizeof (INTN))) {
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if (*(INTN *)MemOne != *(INTN *)MemTwo) {
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break;
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}
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}
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}
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//
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// If Destination/Source/Length not aligned do byte compare
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//
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for (; Length > 0; Length--, MemOne = (VOID *)((UINTN)MemOne + 1), MemTwo = (VOID *)((UINTN)MemTwo + 1)) {
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ReturnValue = (INTN)(*(INT8 *)MemOne - *(INT8 *)MemTwo);
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if (ReturnValue != 0) {
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return ReturnValue;
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}
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}
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return 0;
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}
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