1 /* Conversion UTF-16 to UCS-4.
2 Copyright (C) 2001-2002, 2006-2007, 2009-2014 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2001.
4
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program 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 License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19
20 /* Specification. */
21 #include "unistr.h"
22
23 #if defined IN_LIBUNISTRING || HAVE_INLINE
24
25 int
u16_mbtouc_aux(ucs4_t * puc,const uint16_t * s,size_t n)26 u16_mbtouc_aux (ucs4_t *puc, const uint16_t *s, size_t n)
27 {
28 uint16_t c = *s;
29
30 if (c < 0xdc00)
31 {
32 if (n >= 2)
33 {
34 if (s[1] >= 0xdc00 && s[1] < 0xe000)
35 {
36 *puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00);
37 return 2;
38 }
39 /* invalid multibyte character */
40 }
41 else
42 {
43 /* incomplete multibyte character */
44 }
45 }
46 /* invalid multibyte character */
47 *puc = 0xfffd;
48 return 1;
49 }
50
51 #endif
52