1/*	$Id: compat_strsep.c,v 1.5 2020/06/15 01:37:15 schwarze Exp $	*/
2/*	$OpenBSD: strsep.c,v 1.8 2015/08/31 02:53:57 guenther Exp $	*/
3
4/*-
5 * Copyright (c) 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32#include "config.h"
33
34/*
35 * Get next token from string *stringp, where tokens are possibly-empty
36 * strings separated by characters from delim.
37 *
38 * Writes NULs into the string at *stringp to end tokens.
39 * delim need not remain constant from call to call.
40 * On return, *stringp points past the last NUL written (if there might
41 * be further tokens), or is NULL (if there are definitely no more tokens).
42 *
43 * If *stringp is NULL, strsep returns NULL.
44 */
45char *
46strsep(char **stringp, const char *delim)
47{
48	char *s;
49	const char *spanp;
50	int c, sc;
51	char *tok;
52
53	if ((s = *stringp) == NULL)
54		return (NULL);
55	for (tok = s;;) {
56		c = *s++;
57		spanp = delim;
58		do {
59			if ((sc = *spanp++) == c) {
60				if (c == 0)
61					s = NULL;
62				else
63					s[-1] = 0;
64				*stringp = s;
65				return (tok);
66			}
67		} while (sc != 0);
68	}
69	/* NOTREACHED */
70}
71