EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCopyMem.c

   1 /*++
   2
   3 Copyright (c) 2004, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   EfiCopyMem.c
  15
  16 Abstract:
  17
  18   Implementation of the EfiCopyMem routine. This function is broken
  19   out into its own source file so that it can be excluded from a
  20   build for a particular platform easily if an optimized version
  21   is desired.
  22
  23 --*/
  24
  25 #include "Tiano.h"
  26
  27 VOID
  28 EfiCommonLibCopyMem (
  29   IN VOID   *Destination,
  30   IN VOID   *Source,
  31   IN UINTN  Length
  32   )
  33 /*++
  34
  35 Routine Description:
  36
  37   Copy Length bytes from Source to Destination.
  38
  39 Arguments:
  40
  41   Destination - Target of copy
  42
  43   Source      - Place to copy from
  44
  45   Length      - Number of bytes to copy
  46
  47 Returns:
  48
  49   None
  50
  51 --*/
  52 {
  53   CHAR8 *Destination8;
  54   CHAR8 *Source8;
  55
  56   if (Source < Destination) {
  57     Destination8  = (CHAR8 *) Destination + Length - 1;
  58     Source8       = (CHAR8 *) Source + Length - 1;
  59     while (Length--) {
  60       *(Destination8--) = *(Source8--);
  61     }
  62   } else {
  63     Destination8  = (CHAR8 *) Destination;
  64     Source8       = (CHAR8 *) Source;
  65     while (Length--) {
  66       *(Destination8++) = *(Source8++);
  67     }
  68   }
  69 }