1/** @file 2 CopyMem() implementation. 3 4 The following BaseMemoryLib instances contain the same copy of this file: 5 6 BaseMemoryLib 7 BaseMemoryLibMmx 8 BaseMemoryLibSse2 9 BaseMemoryLibRepStr 10 BaseMemoryLibOptDxe 11 BaseMemoryLibOptPei 12 PeiMemoryLib 13 UefiMemoryLib 14 15 Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 16 This program and the accompanying materials 17 are licensed and made available under the terms and conditions of the BSD License 18 which accompanies this distribution. The full text of the license may be found at 19 http://opensource.org/licenses/bsd-license.php. 20 21 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 22 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 23 24**/ 25 26#include "MemLibInternals.h" 27 28/** 29 Copies a source buffer to a destination buffer, and returns the destination buffer. 30 31 This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns 32 DestinationBuffer. The implementation must be reentrant, and it must handle the case 33 where SourceBuffer overlaps DestinationBuffer. 34 35 If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). 36 If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). 37 38 @param DestinationBuffer The pointer to the destination buffer of the memory copy. 39 @param SourceBuffer The pointer to the source buffer of the memory copy. 40 @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer. 41 42 @return DestinationBuffer. 43 44**/ 45VOID * 46EFIAPI 47CopyMem ( 48 OUT VOID *DestinationBuffer, 49 IN CONST VOID *SourceBuffer, 50 IN UINTN Length 51 ) 52{ 53 if (Length == 0) { 54 return DestinationBuffer; 55 } 56 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer)); 57 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer)); 58 59 if (DestinationBuffer == SourceBuffer) { 60 return DestinationBuffer; 61 } 62 return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length); 63} 64