1 /* $OpenBSD: strsep.c,v 1.6 2005/08/08 08:05:37 espie 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 /* OPENBSD ORIGINAL: lib/libc/string/strsep.c */
33
34 #include "includes.h"
35
36 #if !defined(HAVE_STRSEP)
37
38 #include <string.h>
39 #include <stdio.h>
40
41 /*
42 * Get next token from string *stringp, where tokens are possibly-empty
43 * strings separated by characters from delim.
44 *
45 * Writes NULs into the string at *stringp to end tokens.
46 * delim need not remain constant from call to call.
47 * On return, *stringp points past the last NUL written (if there might
48 * be further tokens), or is NULL (if there are definitely no more tokens).
49 *
50 * If *stringp is NULL, strsep returns NULL.
51 */
52 char *
strsep(char ** stringp,const char * delim)53 strsep(char **stringp, const char *delim)
54 {
55 char *s;
56 const char *spanp;
57 int c, sc;
58 char *tok;
59
60 if ((s = *stringp) == NULL)
61 return (NULL);
62 for (tok = s;;) {
63 c = *s++;
64 spanp = delim;
65 do {
66 if ((sc = *spanp++) == c) {
67 if (c == 0)
68 s = NULL;
69 else
70 s[-1] = 0;
71 *stringp = s;
72 return (tok);
73 }
74 } while (sc != 0);
75 }
76 /* NOTREACHED */
77 }
78
79 #endif /* !defined(HAVE_STRSEP) */
80