strsep.c revision 126274 
1/* OPENBSD ORIGINAL: lib/libc/string/strsep.c */
2
3/*	$OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $	*/
4
5/*-
6 * Copyright (c) 1990, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "includes.h"
35
36#if !defined(HAVE_STRSEP)
37
38#include <string.h>
39#include <stdio.h>
40
41#if defined(LIBC_SCCS) && !defined(lint)
42#if 0
43static char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";
44#else
45static char *rcsid = "$OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $";
46#endif
47#endif /* LIBC_SCCS and not lint */
48
49/*
50 * Get next token from string *stringp, where tokens are possibly-empty
51 * strings separated by characters from delim.
52 *
53 * Writes NULs into the string at *stringp to end tokens.
54 * delim need not remain constant from call to call.
55 * On return, *stringp points past the last NUL written (if there might
56 * be further tokens), or is NULL (if there are definitely no more tokens).
57 *
58 * If *stringp is NULL, strsep returns NULL.
59 */
60char *
61strsep(char **stringp, const char *delim)
62{
63	char *s;
64	const char *spanp;
65	int c, sc;
66	char *tok;
67
68	if ((s = *stringp) == NULL)
69		return (NULL);
70	for (tok = s;;) {
71		c = *s++;
72		spanp = delim;
73		do {
74			if ((sc = *spanp++) == c) {
75				if (c == 0)
76					s = NULL;
77				else
78					s[-1] = 0;
79				*stringp = s;
80				return (tok);
81			}
82		} while (sc != 0);
83	}
84	/* NOTREACHED */
85}
86
87#endif /* !defined(HAVE_STRSEP) */
88