]>
Commit | Line | Data |
---|---|---|
1 | /** @file\r | |
2 | CompareMem() implementation.\r | |
3 | \r | |
4 | The following BaseMemoryLib instances contain the same copy of this file:\r | |
5 | BaseMemoryLib\r | |
6 | BaseMemoryLibMmx\r | |
7 | BaseMemoryLibSse2\r | |
8 | BaseMemoryLibRepStr\r | |
9 | BaseMemoryLibOptDxe\r | |
10 | BaseMemoryLibOptPei\r | |
11 | PeiMemoryLib\r | |
12 | UefiMemoryLib\r | |
13 | \r | |
14 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
15 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
16 | \r | |
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 | |
28 | \r | |
29 | If Length > 0 and DestinationBuffer is NULL, then ASSERT().\r | |
30 | If Length > 0 and SourceBuffer is NULL, then ASSERT().\r | |
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 | |
33 | \r | |
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 | |
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 | |
41 | \r | |
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 | |
51 | if ((Length == 0) || (DestinationBuffer == SourceBuffer)) {\r | |
52 | return 0;\r | |
53 | }\r | |
54 | \r | |
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 |