projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3eb9473e | 1 | /*++\r |
| 2 | \r | |
| 2c7e5c2f HT |
3 | Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>\r |
| 4 | This program and the accompanying materials \r | |
| 3eb9473e | 5 | are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | which accompanies this distribution. The full text of the license may be found at \r | |
| 7 | http://opensource.org/licenses/bsd-license.php \r | |
| 8 | \r | |
| 9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 11 | \r | |
| 12 | \r | |
| 13 | Module Name:\r | |
| 14 | \r | |
| 15 | CopyMem.c\r | |
| 16 | \r | |
| 17 | Abstract: \r | |
| 18 | \r | |
| 19 | Internal CopyMem\r | |
| 20 | \r | |
| 21 | --*/\r | |
| 22 | \r | |
| 23 | #include "BaseMemoryLibInternal.h"\r | |
| 24 | \r | |
| 25 | /**\r | |
| 26 | Copy Length bytes from Source to Destination.\r | |
| 27 | \r | |
| 28 | @param Destination Target of copy\r | |
| 29 | @param Source Place to copy from\r | |
| 30 | @param Length Number of bytes to copy\r | |
| 31 | \r | |
| 32 | @return Destination\r | |
| 33 | \r | |
| 34 | **/\r | |
| 35 | VOID *\r | |
| 36 | EFIAPI\r | |
| 37 | InternalMemCopyMem (\r | |
| 38 | OUT VOID *Destination,\r | |
| 39 | IN CONST VOID *Source,\r | |
| 40 | IN UINTN Length\r | |
| 41 | )\r | |
| 42 | {\r | |
| 43 | //\r | |
| 44 | // Declare the local variables that actually move the data elements as\r | |
| 45 | // volatile to prevent the optimizer from replacing this function with\r | |
| 46 | // the intrinsic memcpy()\r | |
| 47 | //\r | |
| 48 | volatile UINT8 *Destination8;\r | |
| 49 | CONST UINT8 *Source8;\r | |
| 50 | \r | |
| 51 | if (Source > Destination) {\r | |
| 52 | Destination8 = (UINT8*)Destination;\r | |
| 53 | Source8 = (CONST UINT8*)Source;\r | |
| 54 | while (Length-- != 0) {\r | |
| 55 | *(Destination8++) = *(Source8++);\r | |
| 56 | }\r | |
| 57 | } else if (Source < Destination) {\r | |
| 58 | Destination8 = (UINT8*)Destination + Length;\r | |
| 59 | Source8 = (CONST UINT8*)Source + Length;\r | |
| 60 | while (Length-- != 0) {\r | |
| 61 | *(--Destination8) = *(--Source8);\r | |
| 62 | }\r | |
| 63 | }\r | |
| 64 | return Destination;\r | |
| 65 | }\r |