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