1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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/param.h>
33#include <sys/libkern.h>
34
35/*
36 * Get next token from string *stringp, where tokens are possibly-empty
37 * strings separated by characters from delim.
38 *
39 * Writes NULs into the string at *stringp to end tokens.
40 * delim need not remain constant from call to call.
41 * On return, *stringp points past the last NUL written (if there might
42 * be further tokens), or is NULL (if there are definitely no more tokens).
43 *
44 * If *stringp is NULL, strsep returns NULL.
45 */
46char *
47strsep(char **stringp, const char *delim)
48{
49	char *s;
50	const char *spanp;
51	int c, sc;
52	char *tok;
53
54	if ((s = *stringp) == NULL)
55		return (NULL);
56	for (tok = s;;) {
57		c = *s++;
58		spanp = delim;
59		do {
60			if ((sc = *spanp++) == c) {
61				if (c == '\0')
62					s = NULL;
63				else
64					s[-1] = '\0';
65				*stringp = s;
66				return (tok);
67			}
68		} while (sc != '\0');
69	}
70	/* NOTREACHED */
71}
72