strsep.c revision 124208 
1/*	$OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt 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 "includes.h"
33
34#if !defined(HAVE_STRSEP)
35
36#include <string.h>
37#include <stdio.h>
38
39#if defined(LIBC_SCCS) && !defined(lint)
40#if 0
41static char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";
42#else
43static char *rcsid = "$OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $";
44#endif
45#endif /* LIBC_SCCS and not lint */
46
47/*
48 * Get next token from string *stringp, where tokens are possibly-empty
49 * strings separated by characters from delim.
50 *
51 * Writes NULs into the string at *stringp to end tokens.
52 * delim need not remain constant from call to call.
53 * On return, *stringp points past the last NUL written (if there might
54 * be further tokens), or is NULL (if there are definitely no more tokens).
55 *
56 * If *stringp is NULL, strsep returns NULL.
57 */
58char *
59strsep(char **stringp, const char *delim)
60{
61	char *s;
62	const char *spanp;
63	int c, sc;
64	char *tok;
65
66	if ((s = *stringp) == NULL)
67		return (NULL);
68	for (tok = s;;) {
69		c = *s++;
70		spanp = delim;
71		do {
72			if ((sc = *spanp++) == c) {
73				if (c == 0)
74					s = NULL;
75				else
76					s[-1] = 0;
77				*stringp = s;
78				return (tok);
79			}
80		} while (sc != 0);
81	}
82	/* NOTREACHED */
83}
84
85#endif /* !defined(HAVE_STRSEP) */
86