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/* Look at first character in UTF-16 string.
Copyright (C) 1999-2000, 2002, 2006-2007, 2009-2015 Free Software
Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
int
u16_mblen (const uint16_t *s, size_t n)
{
if (n > 0)
{
/* Keep in sync with unistr.h and utf16-ucs4.c. */
uint16_t c = *s;
if (c < 0xd800 || c >= 0xe000)
return (c != 0 ? 1 : 0);
#if CONFIG_UNICODE_SAFETY
if (c < 0xdc00)
{
if (n >= 2
&& s[1] >= 0xdc00 && s[1] < 0xe000)
return 2;
}
#else
{
if (n >= 2)
return 2;
}
#endif
}
/* invalid or incomplete multibyte character */
return -1;
}
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