1 /* Look at first character in UTF-16 string.
2 Copyright (C) 1999-2000, 2002, 2006-2007, 2009-2019 Free Software
4 Written by Bruno Haible <bruno@clisp.org>, 2002.
6 This program is free software: you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with this program. If not, see <https://www.gnu.org/licenses/>. */
25 u16_strmbtouc (ucs4_t
*puc
, const uint16_t *s
)
27 /* Keep in sync with unistr.h and u16-mbtouc-aux.c. */
30 if (c
< 0xd800 || c
>= 0xe000)
33 return (c
!= 0 ? 1 : 0);
37 if (s
[1] >= 0xdc00 && s
[1] < 0xe000)
39 *puc
= 0x10000 + ((c
- 0xd800) << 10) + (s
[1] - 0xdc00);
43 /* invalid or incomplete multibyte character */