1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /* $OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $ */
7
8 /*
9 * Copyright (c) 1990, 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include "lint.h"
42 #include <string.h>
43 #include <stdio.h>
44
45 #if defined(LIBC_SCCS) && !defined(lint)
46 #if 0
47 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93";
48 #else
49 static char *rcsid =
50 "$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $";
51 #endif
52 #endif /* LIBC_SCCS and not lint */
53
54 /*
55 * Get next token from string *stringp, where tokens are possibly-empty
56 * strings separated by characters from delim.
57 *
58 * Writes NULs into the string at *stringp to end tokens.
59 * delim need not remain constant from call to call.
60 * On return, *stringp points past the last NUL written (if there might
61 * be further tokens), or is NULL (if there are definitely no more tokens).
62 *
63 * If *stringp is NULL, strsep returns NULL.
64 */
65 char *
strsep(char ** stringp,const char * delim)66 strsep(char **stringp, const char *delim)
67 {
68 register char *s;
69 register const char *spanp;
70 register int c, sc;
71 char *tok;
72
73 if ((s = *stringp) == NULL)
74 return (NULL);
75 for (tok = s; ; ) {
76 c = *s++;
77 spanp = delim;
78 do {
79 if ((sc = *spanp++) == c) {
80 if (c == 0)
81 s = NULL;
82 else
83 s[-1] = 0;
84 *stringp = s;
85 return (tok);
86 }
87 } while (sc != 0);
88 }
89 /* NOTREACHED */
90 }
91