1 /* $NetBSD: bcmp.c,v 1.10 2020/01/29 09:18:26 ad Exp $ */
2
3 /*-
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1987, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61 #include <sys/cdefs.h>
62 #if defined(LIBC_SCCS) && !defined(lint)
63 #if 0
64 static char sccsid[] = "@(#)bcmp.c 8.1 (Berkeley) 6/4/93";
65 #else
66 __RCSID("$NetBSD: bcmp.c,v 1.10 2020/01/29 09:18:26 ad Exp $");
67 #endif
68 #endif /* LIBC_SCCS and not lint */
69
70
71 #if defined(_KERNEL) || defined(_STANDALONE)
72 #include <lib/libkern/libkern.h>
73 #if defined(_STANDALONE)
74 #include <lib/libsa/stand.h>
75 #endif
76 #else
77 #include <sys/types.h>
78
79 #include <assert.h>
80 #include <string.h>
81 #endif
82
83 /*
84 * bcmp -- vax cmpc3 instruction
85 */
86 int
bcmp(const void * s1,const void * s2,size_t n)87 bcmp(const void *s1, const void *s2, size_t n)
88 {
89 const unsigned char *c1, *c2;
90
91 #ifndef _STANDALONE
92 const uintptr_t *b1, *b2;
93
94 b1 = s1;
95 b2 = s2;
96
97 #ifndef __NO_STRICT_ALIGNMENT
98 if ((((uintptr_t)b1 | (uintptr_t)b2) & (sizeof(uintptr_t) - 1)) == 0)
99 #endif
100 {
101 while (n >= sizeof(uintptr_t)) {
102 if (*b1++ != *b2++)
103 return 1;
104 n -= sizeof(uintptr_t);
105 }
106 }
107
108 c1 = (const unsigned char *)b1;
109 c2 = (const unsigned char *)b2;
110 #else
111 c1 = (const unsigned char *)s1;
112 c2 = (const unsigned char *)s2;
113 #endif
114
115 if (n != 0) {
116 do {
117 if (*c1++ != *c2++)
118 return 1;
119 } while (--n != 0);
120 }
121
122 return 0;
123 }
124