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/* Count characters in UTF-8 string.
Copyright (C) 2007, 2009-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2007.
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"
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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