1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** USBX Component */
16 /** */
17 /** Utility */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22
23 /* Include necessary system files. */
24
25 #define UX_SOURCE_CODE
26
27 #include "ux_api.h"
28
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* _ux_utility_memory_compare PORTABLE C */
35 /* 6.1 */
36 /* AUTHOR */
37 /* */
38 /* Chaoqiong Xiao, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function compares two memory blocks. */
43 /* */
44 /* INPUT */
45 /* */
46 /* memory_source Pointer to source */
47 /* memory_destination Pointer to destination */
48 /* length Number of bytes to compare */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* UX_SUCCESS If blocks are equal */
53 /* UX_ERROR If blocks are not equal */
54 /* */
55 /* CALLS */
56 /* */
57 /* None */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* USBX Components */
62 /* */
63 /* RELEASE HISTORY */
64 /* */
65 /* DATE NAME DESCRIPTION */
66 /* */
67 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
68 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
69 /* resulting in version 6.1 */
70 /* */
71 /**************************************************************************/
_ux_utility_memory_compare(VOID * memory_source,VOID * memory_destination,ULONG length)72 UINT _ux_utility_memory_compare(VOID *memory_source, VOID *memory_destination, ULONG length)
73 {
74
75 UCHAR * source;
76 UCHAR * destination;
77
78
79 /* Setup source and destination byte oriented pointers. */
80 source = (UCHAR *) memory_source;
81 destination = (UCHAR *) memory_destination;
82
83 /* Loop to compare blocks. */
84 while(length--)
85 {
86
87 /* Compare a single byte. */
88 if(*destination++ != *source++)
89 {
90
91 /* Not equal, return an error. */
92 return(UX_ERROR);
93 }
94 }
95
96 /* Blocks are equal, return success. */
97 return(UX_SUCCESS);
98 }
99
100
