1 /* $NetBSD: strsep.c,v 1.3 2007/06/04 18:19:28 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: strsep.c,v 1.3 2007/06/04 18:19:28 christos Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #if !defined(_KERNEL) && !defined(_STANDALONE)
42 #include "namespace.h"
43
44 #include <assert.h>
45 #include <string.h>
46
47 #ifdef __weak_alias
__weak_alias(strsep,_strsep)48 __weak_alias(strsep,_strsep)
49 #endif
50
51 #else
52 #include <sys/param.h>
53 #include <lib/libkern/libkern.h>
54 #endif /* !_KERNEL && !_STANDALONE */
55
56 #if !HAVE_STRSEP
57 /*
58 * Get next token from string *stringp, where tokens are possibly-empty
59 * strings separated by characters from delim.
60 *
61 * Writes NULs into the string at *stringp to end tokens.
62 * delim need not remain constant from call to call.
63 * On return, *stringp points past the last NUL written (if there might
64 * be further tokens), or is NULL (if there are definitely no more tokens).
65 *
66 * If *stringp is NULL, strsep returns NULL.
67 */
68 char *
69 strsep(char **stringp, const char *delim)
70 {
71 char *s;
72 const char *spanp;
73 int c, sc;
74 char *tok;
75
76 _DIAGASSERT(stringp != NULL);
77 _DIAGASSERT(delim != NULL);
78
79 if ((s = *stringp) == NULL)
80 return (NULL);
81 for (tok = s;;) {
82 c = *s++;
83 spanp = delim;
84 do {
85 if ((sc = *spanp++) == c) {
86 if (c == 0)
87 s = NULL;
88 else
89 s[-1] = 0;
90 *stringp = s;
91 return (tok);
92 }
93 } while (sc != 0);
94 }
95 /* NOTREACHED */
96 }
97 #endif
98