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/* Check UTF-16 string.
Copyright (C) 2002, 2006-2007, 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
const uint16_t *
u16_check (const uint16_t *s, size_t n)
{
const uint16_t *s_end = s + n;
while (s < s_end)
{
/* Keep in sync with unistr.h and u16-mbtouc-aux.c. */
uint16_t c = *s;
if (c < 0xd800 || c >= 0xe000)
{
s++;
continue;
}
if (c < 0xdc00)
{
if (s + 2 <= s_end
&& s[1] >= 0xdc00 && s[1] < 0xe000)
{
s += 2;
continue;
}
}
/* invalid or incomplete multibyte character */
return s;
}
return NULL;
}
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