1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** USBX Component */
17 /** */
18 /** Utility */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23
24 /* Include necessary system files. */
25
26 #define UX_SOURCE_CODE
27
28 #include "ux_api.h"
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* _ux_utility_memory_compare PORTABLE C */
36 /* 6.1 */
37 /* AUTHOR */
38 /* */
39 /* Chaoqiong Xiao, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* This function compares two memory blocks. */
44 /* */
45 /* INPUT */
46 /* */
47 /* memory_source Pointer to source */
48 /* memory_destination Pointer to destination */
49 /* length Number of bytes to compare */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* UX_SUCCESS If blocks are equal */
54 /* UX_ERROR If blocks are not equal */
55 /* */
56 /* CALLS */
57 /* */
58 /* None */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* USBX Components */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
69 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
70 /* resulting in version 6.1 */
71 /* */
72 /**************************************************************************/
_ux_utility_memory_compare(VOID * memory_source,VOID * memory_destination,ULONG length)73 UINT _ux_utility_memory_compare(VOID *memory_source, VOID *memory_destination, ULONG length)
74 {
75
76 UCHAR * source;
77 UCHAR * destination;
78
79
80 /* Setup source and destination byte oriented pointers. */
81 source = (UCHAR *) memory_source;
82 destination = (UCHAR *) memory_destination;
83
84 /* Loop to compare blocks. */
85 while(length--)
86 {
87
88 /* Compare a single byte. */
89 if(*destination++ != *source++)
90 {
91
92 /* Not equal, return an error. */
93 return(UX_ERROR);
94 }
95 }
96
97 /* Blocks are equal, return success. */
98 return(UX_SUCCESS);
99 }
100
101
