1 /* Copyright (C) 2011-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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.
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.
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/>. */
23 /* This is the private state used if PS is NULL. */
24 static mbstate_t state
;
27 c16rtomb (char *s
, char16_t c16
, mbstate_t *ps
)
36 /* Reset any state relating to surrogate pairs. */
37 ps
->__count
&= 0x7fffffff;
38 ps
->__value
.__wch
= 0;
42 if (ps
->__count
& 0x80000000)
44 /* The previous call passed in the first surrogate of a
46 ps
->__count
&= 0x7fffffff;
47 if (wc
>= 0xdc00 && wc
< 0xe000)
49 + ((ps
->__value
.__wch
& 0x3ff) << 10)
52 /* This is not a low surrogate; ensure an EILSEQ error by
53 trying to decode the high surrogate as a wide character on
55 wc
= ps
->__value
.__wch
;
56 ps
->__value
.__wch
= 0;
58 else if (wc
>= 0xd800 && wc
< 0xdc00)
60 /* The high part of a surrogate pair. */
61 ps
->__count
|= 0x80000000;
62 ps
->__value
.__wch
= wc
;
66 return wcrtomb (s
, wc
, ps
);