1 /* Look at first character in UTF-32 string.
2 Copyright (C) 2002, 2006-2007, 2009-2014 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
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 int
u32_mblen(const uint32_t * s,size_t n)24 u32_mblen (const uint32_t *s, size_t n)
25 {
26 if (n > 0)
27 {
28 uint32_t c = *s;
29
30 #if CONFIG_UNICODE_SAFETY
31 if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
32 #endif
33 return (c != 0 ? 1 : 0);
34 }
35 /* invalid or incomplete multibyte character */
36 return -1;
37 }
38