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64 lines
2.0 KiB
64 lines
2.0 KiB
4 years ago
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/** @file
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CopyMem() implementation.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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BaseMemoryLibOptDxe
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BaseMemoryLibOptPei
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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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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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**/
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#include "MemLibInternals.h"
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/**
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Copies a source buffer to a destination buffer, and returns the destination buffer.
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This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns
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DestinationBuffer. The implementation must be reentrant, and it must handle the case
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where SourceBuffer overlaps DestinationBuffer.
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If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().
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If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().
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@param DestinationBuffer The pointer to the destination buffer of the memory copy.
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@param SourceBuffer The pointer to the source buffer of the memory copy.
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@param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.
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@return DestinationBuffer.
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**/
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VOID *
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EFIAPI
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CopyMem (
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OUT VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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)
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{
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if (Length == 0) {
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return DestinationBuffer;
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}
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));
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if (DestinationBuffer == SourceBuffer) {
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return DestinationBuffer;
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}
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return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length);
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}
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