xref: /illumos-gate/usr/src/lib/libc/port/i18n/wstok.c (revision 1da57d55)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1986 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 /*
31  * uses wcspbrk and wcsspn to break string into tokens on
32  * sequentially subsequent calls. returns WNULL when no
33  * non-separator characters remain.
34  * 'subsequent' calls are calls with first argument WNULL.
35  */
36 
37 #pragma weak _wstok = wstok
38 
39 #include "lint.h"
40 #include "mtlib.h"
41 #include "mse_int.h"
42 #include <stdlib.h>
43 #include <wchar.h>
44 #include <thread.h>
45 #include "libc.h"
46 #include "tsd.h"
47 
48 #ifndef WNULL
49 #define	WNULL	(wchar_t *)0
50 #endif
51 
52 wchar_t *
__wcstok_xpg5(wchar_t * string,const wchar_t * sepset,wchar_t ** ptr)53 __wcstok_xpg5(wchar_t *string, const wchar_t *sepset, wchar_t **ptr)
54 {
55 	wchar_t *q, *r;
56 
57 	/* first or subsequent call */
58 	if ((string == WNULL && (string = *ptr) == 0) ||
59 	    (((q = string + wcsspn(string, sepset)) != WNULL) && *q == L'\0'))
60 		return (WNULL);
61 
62 	/* sepset becomes next string after separator */
63 	if ((r = wcspbrk(q, sepset)) == WNULL)	/* move past token */
64 		*ptr = 0;	/* indicate this is last token */
65 	else {
66 		*r = L'\0';
67 		*ptr = r + 1;
68 	}
69 	return (q);
70 }
71 
72 
73 wchar_t *
wcstok(wchar_t * string,const wchar_t * sepset)74 wcstok(wchar_t *string, const wchar_t *sepset)
75 {
76 	wchar_t **lasts = tsdalloc(_T_WCSTOK, sizeof (wchar_t *), NULL);
77 
78 	if (lasts == NULL)
79 		return (NULL);
80 	return (__wcstok_xpg5(string, sepset, lasts));
81 }
82 
83 wchar_t *
wstok(wchar_t * string,const wchar_t * sepset)84 wstok(wchar_t *string, const wchar_t *sepset)
85 {
86 	return (wcstok(string, sepset));
87 }
88