opensolaris_string.c revision 168404 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <sys/param.h>
27#include <sys/string.h>
28
29#define	IS_DIGIT(c)	((c) >= '0' && (c) <= '9')
30
31#define	IS_ALPHA(c)	\
32	(((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
33
34char *
35strchr(const char *s, int c)
36{
37	char ch;
38
39	ch = c;
40	for (;; ++s) {
41		if (*s == ch)
42			return ((char *)s);
43		if (*s == '\0')
44			return (NULL);
45	}
46	/* NOTREACHED */
47}
48
49char *
50strrchr(const char *s, int c)
51{
52	char *save;
53	char ch;
54
55	ch = c;
56	for (save = NULL;; ++s) {
57		if (*s == ch)
58			save = (char *)s;
59		if (*s == '\0')
60			return (save);
61	}
62	/* NOTREACHED */
63}
64
65char *
66strpbrk(const char *s, const char *b)
67{
68	const char *p;
69
70	do {
71		for (p = b; *p != '\0' && *p != *s; ++p)
72			;
73		if (*p != '\0')
74			return ((char *)s);
75	} while (*s++);
76
77	return (NULL);
78}
79
80/*
81 * Convert a string into a valid C identifier by replacing invalid
82 * characters with '_'.  Also makes sure the string is nul-terminated
83 * and takes up at most n bytes.
84 */
85void
86strident_canon(char *s, size_t n)
87{
88	char c;
89	char *end = s + n - 1;
90
91	if ((c = *s) == 0)
92		return;
93
94	if (!IS_ALPHA(c) && c != '_')
95		*s = '_';
96
97	while (s < end && ((c = *(++s)) != 0)) {
98		if (!IS_ALPHA(c) && !IS_DIGIT(c) && c != '_')
99			*s = '_';
100	}
101	*s = 0;
102}
103