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7b3b4b29 | 1 | /** @file\r |
2 | CompareMem() implementation.\r | |
3 | \r | |
2bfb6009 | 4 | The following BaseMemoryLib instances contain the same copy of this file:\r |
7b3b4b29 | 5 | \r |
6 | BaseMemoryLib\r | |
7 | BaseMemoryLibMmx\r | |
8 | BaseMemoryLibSse2\r | |
9 | BaseMemoryLibRepStr\r | |
2bfb6009 LG |
10 | BaseMemoryLibOptDxe\r |
11 | BaseMemoryLibOptPei\r | |
7b3b4b29 | 12 | PeiMemoryLib\r |
13 | DxeMemoryLib\r | |
14 | \r | |
eb1c78db | 15 | Copyright (c) 2006-2008, Intel Corporation\r |
16 | All rights reserved. This program and the accompanying materials\r | |
17 | are licensed and made available under the terms and conditions of the BSD License\r | |
18 | which accompanies this distribution. The full text of the license may be found at\r | |
19 | http://opensource.org/licenses/bsd-license.php\r | |
1efcc4ae | 20 | \r |
eb1c78db | 21 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
22 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
7b3b4b29 | 23 | \r |
eb1c78db | 24 | **/\r |
7b3b4b29 | 25 | \r |
26 | #include "MemLibInternals.h"\r | |
27 | \r | |
28 | /**\r | |
29 | Compares the contents of two buffers.\r | |
30 | \r | |
31 | This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer.\r | |
32 | If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the\r | |
33 | value returned is the first mismatched byte in SourceBuffer subtracted from the first\r | |
34 | mismatched byte in DestinationBuffer.\r | |
efb23117 | 35 | \r |
2bfb6009 LG |
36 | If Length > 0 and DestinationBuffer is NULL, then ASSERT().\r |
37 | If Length > 0 and SourceBuffer is NULL, then ASSERT().\r | |
eb1c78db | 38 | If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().\r |
39 | If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r | |
7b3b4b29 | 40 | \r |
41 | @param DestinationBuffer Pointer to the destination buffer to compare.\r | |
42 | @param SourceBuffer Pointer to the source buffer to compare.\r | |
43 | @param Length Number of bytes to compare.\r | |
44 | \r | |
eb1c78db | 45 | @return 0 All Length bytes of the two buffers are identical.\r |
7b3b4b29 | 46 | @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r |
47 | mismatched byte in DestinationBuffer.\r | |
efb23117 | 48 | \r |
7b3b4b29 | 49 | **/\r |
50 | INTN\r | |
51 | EFIAPI\r | |
52 | CompareMem (\r | |
53 | IN CONST VOID *DestinationBuffer,\r | |
54 | IN CONST VOID *SourceBuffer,\r | |
55 | IN UINTN Length\r | |
56 | )\r | |
57 | {\r | |
cc4e0485 | 58 | if (Length == 0 || DestinationBuffer == SourceBuffer) {\r |
7b3b4b29 | 59 | return 0;\r |
60 | }\r | |
61 | ASSERT (DestinationBuffer != NULL);\r | |
62 | ASSERT (SourceBuffer != NULL);\r | |
63 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));\r | |
64 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));\r | |
65 | \r | |
66 | return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length);\r | |
67 | }\r |