EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCopyMem.c

/*++

Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
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.             

Module Name:

  EfiCopyMem.c

Abstract:

  Implementation of the EfiCopyMem routine. This function is broken
  out into its own source file so that it can be excluded from a
  build for a particular platform easily if an optimized version 
  is desired.

--*/

#include "Tiano.h"

VOID
EfiCommonLibCopyMem (
  IN VOID   *Destination,
  IN VOID   *Source,
  IN UINTN  Length
  )
/*++

Routine Description:

  Copy Length bytes from Source to Destination.

Arguments:

  Destination - Target of copy

  Source      - Place to copy from

  Length      - Number of bytes to copy

Returns:

  None

--*/
{
  CHAR8 *Destination8;
  CHAR8 *Source8;

  if (Source < Destination) {
    Destination8  = (CHAR8 *) Destination + Length - 1;
    Source8       = (CHAR8 *) Source + Length - 1;
    while (Length--) {
      *(Destination8--) = *(Source8--);
    }
  } else {
    Destination8  = (CHAR8 *) Destination;
    Source8       = (CHAR8 *) Source;
    while (Length--) {
      *(Destination8++) = *(Source8++);
    }
  }
}