1/* Copyright (C) 1995-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <wchar.h>
20#include <errno.h>
21
22
23/* Parse WCS into tokens separated by characters in DELIM. If WCS is
24 NULL, the last string wcstok() was called with is used. */
25wchar_t *
26wcstok (wchar_t *wcs, const wchar_t *delim, wchar_t **save_ptr)
27{
28 wchar_t *result;
29
30 if (wcs == NULL)
31 {
32 if (*save_ptr == NULL)
33 {
34 __set_errno (EINVAL);
35 return NULL;
36 }
37 else
38 wcs = *save_ptr;
39 }
40
41 /* Scan leading delimiters. */
42 wcs += wcsspn (wcs, delim);
43 if (*wcs == L'\0')
44 {
45 *save_ptr = NULL;
46 return NULL;
47 }
48
49 /* Find the end of the token. */
50 result = wcs;
51 wcs = wcspbrk (result, delim);
52 if (wcs == NULL)
53 /* This token finishes the string. */
54 *save_ptr = NULL;
55 else
56 {
57 /* Terminate the token and make *SAVE_PTR point past it. */
58 *wcs = L'\0';
59 *save_ptr = wcs + 1;
60 }
61 return result;
62}
63