1 15974c9d 2021-07-28 op /*	$OpenBSD: strsep.c,v 1.8 2015/08/31 02:53:57 guenther Exp $	*/
 2 15974c9d 2021-07-28 op 
 3 15974c9d 2021-07-28 op /*-
 4 15974c9d 2021-07-28 op  * Copyright (c) 1990, 1993
 5 15974c9d 2021-07-28 op  *	The Regents of the University of California.  All rights reserved.
 6 15974c9d 2021-07-28 op  *
 7 15974c9d 2021-07-28 op  * Redistribution and use in source and binary forms, with or without
 8 15974c9d 2021-07-28 op  * modification, are permitted provided that the following conditions
 9 15974c9d 2021-07-28 op  * are met:
10 15974c9d 2021-07-28 op  * 1. Redistributions of source code must retain the above copyright
11 15974c9d 2021-07-28 op  *    notice, this list of conditions and the following disclaimer.
12 15974c9d 2021-07-28 op  * 2. Redistributions in binary form must reproduce the above copyright
13 15974c9d 2021-07-28 op  *    notice, this list of conditions and the following disclaimer in the
14 15974c9d 2021-07-28 op  *    documentation and/or other materials provided with the distribution.
15 15974c9d 2021-07-28 op  * 3. Neither the name of the University nor the names of its contributors
16 15974c9d 2021-07-28 op  *    may be used to endorse or promote products derived from this software
17 15974c9d 2021-07-28 op  *    without specific prior written permission.
18 15974c9d 2021-07-28 op  *
19 15974c9d 2021-07-28 op  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 15974c9d 2021-07-28 op  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 15974c9d 2021-07-28 op  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 15974c9d 2021-07-28 op  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 15974c9d 2021-07-28 op  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 15974c9d 2021-07-28 op  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 15974c9d 2021-07-28 op  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 15974c9d 2021-07-28 op  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 15974c9d 2021-07-28 op  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 15974c9d 2021-07-28 op  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 15974c9d 2021-07-28 op  * SUCH DAMAGE.
30 15974c9d 2021-07-28 op  */
31 15974c9d 2021-07-28 op 
32 15974c9d 2021-07-28 op #include "compat.h"
33 15974c9d 2021-07-28 op 
34 15974c9d 2021-07-28 op #include <string.h>
35 15974c9d 2021-07-28 op 
36 15974c9d 2021-07-28 op /*
37 15974c9d 2021-07-28 op  * Get next token from string *stringp, where tokens are possibly-empty
38 15974c9d 2021-07-28 op  * strings separated by characters from delim.  
39 15974c9d 2021-07-28 op  *
40 15974c9d 2021-07-28 op  * Writes NULs into the string at *stringp to end tokens.
41 15974c9d 2021-07-28 op  * delim need not remain constant from call to call.
42 15974c9d 2021-07-28 op  * On return, *stringp points past the last NUL written (if there might
43 15974c9d 2021-07-28 op  * be further tokens), or is NULL (if there are definitely no more tokens).
44 15974c9d 2021-07-28 op  *
45 15974c9d 2021-07-28 op  * If *stringp is NULL, strsep returns NULL.
46 15974c9d 2021-07-28 op  */
47 15974c9d 2021-07-28 op char *
48 15974c9d 2021-07-28 op strsep(char **stringp, const char *delim)
49 15974c9d 2021-07-28 op {
50 15974c9d 2021-07-28 op 	char *s;
51 15974c9d 2021-07-28 op 	const char *spanp;
52 15974c9d 2021-07-28 op 	int c, sc;
53 15974c9d 2021-07-28 op 	char *tok;
54 15974c9d 2021-07-28 op 
55 15974c9d 2021-07-28 op 	if ((s = *stringp) == NULL)
56 15974c9d 2021-07-28 op 		return (NULL);
57 15974c9d 2021-07-28 op 	for (tok = s;;) {
58 15974c9d 2021-07-28 op 		c = *s++;
59 15974c9d 2021-07-28 op 		spanp = delim;
60 15974c9d 2021-07-28 op 		do {
61 15974c9d 2021-07-28 op 			if ((sc = *spanp++) == c) {
62 15974c9d 2021-07-28 op 				if (c == 0)
63 15974c9d 2021-07-28 op 					s = NULL;
64 15974c9d 2021-07-28 op 				else
65 15974c9d 2021-07-28 op 					s[-1] = 0;
66 15974c9d 2021-07-28 op 				*stringp = s;
67 15974c9d 2021-07-28 op 				return (tok);
68 15974c9d 2021-07-28 op 			}
69 15974c9d 2021-07-28 op 		} while (sc != 0);
70 15974c9d 2021-07-28 op 	}
71 15974c9d 2021-07-28 op 	/* NOTREACHED */
72 15974c9d 2021-07-28 op }