strsep.c revision 106121 
1/*	$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "includes.h"
37
38#if !defined(HAVE_STRSEP)
39
40#include <string.h>
41#include <stdio.h>
42
43#if defined(LIBC_SCCS) && !defined(lint)
44#if 0
45static char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";
46#else
47static char *rcsid = "$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $";
48#endif
49#endif /* LIBC_SCCS and not lint */
50
51/*
52 * Get next token from string *stringp, where tokens are possibly-empty
53 * strings separated by characters from delim.
54 *
55 * Writes NULs into the string at *stringp to end tokens.
56 * delim need not remain constant from call to call.
57 * On return, *stringp points past the last NUL written (if there might
58 * be further tokens), or is NULL (if there are definitely no more tokens).
59 *
60 * If *stringp is NULL, strsep returns NULL.
61 */
62char *
63strsep(char **stringp, const char *delim)
64{
65	register char *s;
66	register const char *spanp;
67	register int c, sc;
68	char *tok;
69
70	if ((s = *stringp) == NULL)
71		return (NULL);
72	for (tok = s;;) {
73		c = *s++;
74		spanp = delim;
75		do {
76			if ((sc = *spanp++) == c) {
77				if (c == 0)
78					s = NULL;
79				else
80					s[-1] = 0;
81				*stringp = s;
82				return (tok);
83			}
84		} while (sc != 0);
85	}
86	/* NOTREACHED */
87}
88
89#endif /* !defined(HAVE_STRSEP) */
90