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