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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/** @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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SPDX-License-Identifier: BSD-2-Clause-Patent
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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 A pointer to the destination buffer of the memory copy.
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@param SourceBuffer A 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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