1 | /* $NetBSD: strsep.c,v 1.3 2007/06/04 18:19:28 christos 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 | #include <sys/cdefs.h> |
33 | #if defined(LIBC_SCCS) && !defined(lint) |
34 | #if 0 |
35 | static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93" ; |
36 | #else |
37 | __RCSID("$NetBSD: strsep.c,v 1.3 2007/06/04 18:19:28 christos Exp $" ); |
38 | #endif |
39 | #endif /* LIBC_SCCS and not lint */ |
40 | |
41 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
42 | #include "namespace.h" |
43 | |
44 | #include <assert.h> |
45 | #include <string.h> |
46 | |
47 | #ifdef __weak_alias |
48 | __weak_alias(strsep,_strsep) |
49 | #endif |
50 | |
51 | #else |
52 | #include <sys/param.h> |
53 | #include <lib/libkern/libkern.h> |
54 | #endif /* !_KERNEL && !_STANDALONE */ |
55 | |
56 | #if !HAVE_STRSEP |
57 | /* |
58 | * Get next token from string *stringp, where tokens are possibly-empty |
59 | * strings separated by characters from delim. |
60 | * |
61 | * Writes NULs into the string at *stringp to end tokens. |
62 | * delim need not remain constant from call to call. |
63 | * On return, *stringp points past the last NUL written (if there might |
64 | * be further tokens), or is NULL (if there are definitely no more tokens). |
65 | * |
66 | * If *stringp is NULL, strsep returns NULL. |
67 | */ |
68 | char * |
69 | strsep(char **stringp, const char *delim) |
70 | { |
71 | char *s; |
72 | const char *spanp; |
73 | int c, sc; |
74 | char *tok; |
75 | |
76 | _DIAGASSERT(stringp != NULL); |
77 | _DIAGASSERT(delim != NULL); |
78 | |
79 | if ((s = *stringp) == NULL) |
80 | return (NULL); |
81 | for (tok = s;;) { |
82 | c = *s++; |
83 | spanp = delim; |
84 | do { |
85 | if ((sc = *spanp++) == c) { |
86 | if (c == 0) |
87 | s = NULL; |
88 | else |
89 | s[-1] = 0; |
90 | *stringp = s; |
91 | return (tok); |
92 | } |
93 | } while (sc != 0); |
94 | } |
95 | /* NOTREACHED */ |
96 | } |
97 | #endif |
98 | |