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/* Count characters in UTF-8 string.
Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2007.
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"
size_t
u8_mbsnlen (const uint8_t *s, size_t n)
{
size_t characters;
characters = 0;
while (n > 0)
{
ucs4_t uc;
int count = u8_mbtoucr (&uc, s, n);
characters++;
if (count == -2)
break;
if (count < 0)
count = u8_mbtouc (&uc, s, n);
else if (count == 0)
count = 1;
s += count;
n -= count;
}
return characters;
}
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