1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. 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 #include <LibConfig.h>
34
35 #include <sys/cdefs.h>
36 #include <string.h>
37 #include <stdio.h>
38
39 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93";
41 #endif /* LIBC_SCCS and not lint */
42
43 /*
44 * Get next token from string *stringp, where tokens are possibly-empty
45 * strings separated by characters from delim.
46 *
47 * Writes NULs into the string at *stringp to end tokens.
48 * delim need not remain constant from call to call.
49 * On return, *stringp points past the last NUL written (if there might
50 * be further tokens), or is NULL (if there are definitely no more tokens).
51 *
52 * If *stringp is NULL, strsep returns NULL.
53 */
54 char *
strsep(register char ** stringp,register const char * delim)55 strsep(
56 register char **stringp,
57 register const char *delim
58 )
59 {
60 register char *s;
61 register const char *spanp;
62 register int c, sc;
63 char *tok;
64
65 if ((s = *stringp) == NULL)
66 return (NULL);
67 for (tok = s;;) {
68 c = *s++;
69 spanp = delim;
70 do {
71 if ((sc = *spanp++) == c) {
72 if (c == 0)
73 s = NULL;
74 else
75 s[-1] = 0;
76 *stringp = s;
77 return (tok);
78 }
79 } while (sc != 0);
80 }
81 /* NOTREACHED */
82 }
83