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/* Counting the multibyte characters in a string.
Copyright (C) 2007-2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2007.
This file 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 2.1 of the
License, or (at your option) any later version.
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 for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <string.h>
#include <stdlib.h>
#if GNULIB_MCEL_PREFER
# include "mcel.h"
#else
# include "mbiterf.h"
#endif
/* Return the number of multibyte characters in the character string starting
at STRING and ending at STRING + LEN. */
size_t
mbsnlen (const char *string, size_t len)
{
if (MB_CUR_MAX > 1)
{
size_t count = 0;
const char *string_end = string + len;
#if GNULIB_MCEL_PREFER
for (; *string; string += mcel_scan (string, string_end).len)
count++;
#else
mbif_state_t state;
const char *iter;
for (mbif_init (state), iter = string; mbif_avail (state, iter, string_end); )
{
mbchar_t cur = mbif_next (state, iter, string_end);
count++;
iter += mb_len (cur);
}
#endif
return count;
}
else
return len;
}
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