1 /*
2 ** Copyright 2001, Travis Geiselbrecht. All rights reserved.
3 ** Distributed under the terms of the NewOS License.
4 */
5 /*
6  * Copyright (c) 2008 Travis Geiselbrecht
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining
9  * a copy of this software and associated documentation files
10  * (the "Software"), to deal in the Software without restriction,
11  * including without limitation the rights to use, copy, modify, merge,
12  * publish, distribute, sublicense, and/or sell copies of the Software,
13  * and to permit persons to whom the Software is furnished to do so,
14  * subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be
17  * included in all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
23  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  */
27 #include <string.h>
28 #include <sys/types.h>
29 
30 #include <lk/compiler.h>
31 
32 int
memcmp(const void * cs,const void * ct,size_t count)33 memcmp(const void *cs, const void *ct, size_t count)
34 {
35     const unsigned char *su1, *su2;
36     int res = 0;
37 
38     for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
39         if ((res = *su1 - *su2) != 0)
40             break;
41     return res;
42 }
43 
44 /*
45  * Any compliant memcmp implementation is a bcmp implementation. Modern clang
46  * sometimes generates bcmp calls, and we do not have a specialized bcmp
47  * implementation.
48  */
49 int bcmp(const void *cs, const void *ct, size_t count) __WEAK_ALIAS("memcmp");
50