projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| c5ecf6c1 | 1 | /** @file\r |
| 2 | CompareMem() implementation.\r | |
| 3 | \r | |
| 2bfb6009 | 4 | The following BaseMemoryLib instances contain the same copy of this file:\r |
| c5ecf6c1 | 5 | BaseMemoryLib\r |
| 6 | BaseMemoryLibMmx\r | |
| 7 | BaseMemoryLibSse2\r | |
| 8 | BaseMemoryLibRepStr\r | |
| 2bfb6009 LG |
9 | BaseMemoryLibOptDxe\r |
| 10 | BaseMemoryLibOptPei\r | |
| c5ecf6c1 | 11 | PeiMemoryLib\r |
| 1fef058f | 12 | UefiMemoryLib\r |
| c5ecf6c1 | 13 | \r |
| 9095d37b | 14 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
| 9344f092 | 15 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| d531bfee | 16 | \r |
| c5ecf6c1 | 17 | **/\r |
| 18 | \r | |
| 19 | #include "MemLibInternals.h"\r | |
| 20 | \r | |
| 21 | /**\r | |
| 22 | Compares the contents of two buffers.\r | |
| 23 | \r | |
| 24 | This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer.\r | |
| 25 | If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the\r | |
| 26 | value returned is the first mismatched byte in SourceBuffer subtracted from the first\r | |
| 27 | mismatched byte in DestinationBuffer.\r | |
| 9095d37b | 28 | \r |
| 2bfb6009 LG |
29 | If Length > 0 and DestinationBuffer is NULL, then ASSERT().\r |
| 30 | If Length > 0 and SourceBuffer is NULL, then ASSERT().\r | |
| eb1c78db | 31 | If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().\r |
| 32 | If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r | |
| c5ecf6c1 | 33 | \r |
| 15c952e7 | 34 | @param DestinationBuffer The pointer to the destination buffer to compare.\r |
| 35 | @param SourceBuffer The pointer to the source buffer to compare.\r | |
| 36 | @param Length The number of bytes to compare.\r | |
| c5ecf6c1 | 37 | \r |
| 38 | @return 0 All Length bytes of the two buffers are identical.\r | |
| 39 | @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r | |
| 40 | mismatched byte in DestinationBuffer.\r | |
| 9095d37b | 41 | \r |
| c5ecf6c1 | 42 | **/\r |
| 43 | INTN\r | |
| 44 | EFIAPI\r | |
| 45 | CompareMem (\r | |
| 46 | IN CONST VOID *DestinationBuffer,\r | |
| 47 | IN CONST VOID *SourceBuffer,\r | |
| 48 | IN UINTN Length\r | |
| 49 | )\r | |
| 50 | {\r | |
| 2f88bd3a | 51 | if ((Length == 0) || (DestinationBuffer == SourceBuffer)) {\r |
| c5ecf6c1 | 52 | return 0;\r |
| 53 | }\r | |
| 2f88bd3a | 54 | \r |
| c5ecf6c1 | 55 | ASSERT (DestinationBuffer != NULL);\r |
| 56 | ASSERT (SourceBuffer != NULL);\r | |
| 57 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));\r | |
| 58 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));\r | |
| 59 | \r | |
| 60 | return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length);\r | |
| 61 | }\r |