xref: /illumos-gate/usr/src/common/util/memstr.c (revision 7c478bd9)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate 
29*7c478bd9Sstevel@tonic-gate #if defined(_BOOT)
30*7c478bd9Sstevel@tonic-gate #include <sys/salib.h>
31*7c478bd9Sstevel@tonic-gate #else
32*7c478bd9Sstevel@tonic-gate #include <sys/systm.h>
33*7c478bd9Sstevel@tonic-gate #endif
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate /*
36*7c478bd9Sstevel@tonic-gate  * Implementations of functions described in memory(3C).
37*7c478bd9Sstevel@tonic-gate  * These functions match the section 3C manpages.
38*7c478bd9Sstevel@tonic-gate  */
39*7c478bd9Sstevel@tonic-gate 
40*7c478bd9Sstevel@tonic-gate void *
41*7c478bd9Sstevel@tonic-gate memmove(void *s1, const void *s2, size_t n)
42*7c478bd9Sstevel@tonic-gate {
43*7c478bd9Sstevel@tonic-gate #if defined(_BOOT)
44*7c478bd9Sstevel@tonic-gate 	bcopy(s2, s1, n);
45*7c478bd9Sstevel@tonic-gate #else
46*7c478bd9Sstevel@tonic-gate 	ovbcopy(s2, s1, n);
47*7c478bd9Sstevel@tonic-gate #endif
48*7c478bd9Sstevel@tonic-gate 	return (s1);
49*7c478bd9Sstevel@tonic-gate }
50*7c478bd9Sstevel@tonic-gate 
51*7c478bd9Sstevel@tonic-gate void *
52*7c478bd9Sstevel@tonic-gate memset(void *s, int c, size_t n)
53*7c478bd9Sstevel@tonic-gate {
54*7c478bd9Sstevel@tonic-gate 	unsigned char *t;
55*7c478bd9Sstevel@tonic-gate 
56*7c478bd9Sstevel@tonic-gate 	if ((unsigned char)c == '\0')
57*7c478bd9Sstevel@tonic-gate 		bzero(s, n);
58*7c478bd9Sstevel@tonic-gate 	else {
59*7c478bd9Sstevel@tonic-gate 		for (t = (unsigned char *)s; n > 0; n--)
60*7c478bd9Sstevel@tonic-gate 			*t++ = (unsigned char)c;
61*7c478bd9Sstevel@tonic-gate 	}
62*7c478bd9Sstevel@tonic-gate 	return (s);
63*7c478bd9Sstevel@tonic-gate }
64*7c478bd9Sstevel@tonic-gate 
65*7c478bd9Sstevel@tonic-gate int
66*7c478bd9Sstevel@tonic-gate memcmp(const void *s1, const void *s2, size_t n)
67*7c478bd9Sstevel@tonic-gate {
68*7c478bd9Sstevel@tonic-gate 	const uchar_t *ps1 = s1;
69*7c478bd9Sstevel@tonic-gate 	const uchar_t *ps2 = s2;
70*7c478bd9Sstevel@tonic-gate 
71*7c478bd9Sstevel@tonic-gate 	if (s1 != s2 && n != 0) {
72*7c478bd9Sstevel@tonic-gate 		do {
73*7c478bd9Sstevel@tonic-gate 			if (*ps1++ != *ps2++)
74*7c478bd9Sstevel@tonic-gate 				return (ps1[-1] - ps2[-1]);
75*7c478bd9Sstevel@tonic-gate 		} while (--n != 0);
76*7c478bd9Sstevel@tonic-gate 	}
77*7c478bd9Sstevel@tonic-gate 
78*7c478bd9Sstevel@tonic-gate 	return (0);
79*7c478bd9Sstevel@tonic-gate }
80*7c478bd9Sstevel@tonic-gate 
81*7c478bd9Sstevel@tonic-gate void *
82*7c478bd9Sstevel@tonic-gate memcpy(void *s1, const void *s2, size_t n)
83*7c478bd9Sstevel@tonic-gate {
84*7c478bd9Sstevel@tonic-gate 	bcopy(s2, s1, n);
85*7c478bd9Sstevel@tonic-gate 	return (s1);
86*7c478bd9Sstevel@tonic-gate }
87*7c478bd9Sstevel@tonic-gate 
88*7c478bd9Sstevel@tonic-gate void *
89*7c478bd9Sstevel@tonic-gate memchr(const void *sptr, int c1, size_t n)
90*7c478bd9Sstevel@tonic-gate {
91*7c478bd9Sstevel@tonic-gate 	if (n != 0) {
92*7c478bd9Sstevel@tonic-gate 		unsigned char c = (unsigned char)c1;
93*7c478bd9Sstevel@tonic-gate 		const unsigned char *sp = sptr;
94*7c478bd9Sstevel@tonic-gate 
95*7c478bd9Sstevel@tonic-gate 		do {
96*7c478bd9Sstevel@tonic-gate 			if (*sp++ == c)
97*7c478bd9Sstevel@tonic-gate 				return ((void *)--sp);
98*7c478bd9Sstevel@tonic-gate 		} while (--n != 0);
99*7c478bd9Sstevel@tonic-gate 	}
100*7c478bd9Sstevel@tonic-gate 	return (NULL);
101*7c478bd9Sstevel@tonic-gate }
102