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/* Return number of characters in multibyte representation for current
character set.
Copyright (C) 1996-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <langinfo.h>
#include <locale.h>
#include <stdlib.h>
#include "localeinfo.h"
/* This is a gross hack to get broken programs running.
ISO C provides no mean to find out how many bytes the wide
character representation really uses. But it defines MB_CUR_LEN to
return the information for the multi-byte character representation.
Many programmers don't know the difference between the two and
think this means the same. But assuming all characters have a size
of MB_CUR_LEN after they have been processed by `mbrtowc' is wrong.
Instead the maximum number of characters used for the conversion is
MB_CUR_LEN.
It is known that some Motif applications have this problem. To
cure this one has to make sure the glibc uses the function in this
file instead of the one in locale/mb_cur_max.c. This can either be
done by linking with this file or by using the LD_PRELOAD feature
of the dynamic linker. */
size_t
__ctype_get_mb_cur_max (void)
{
union locale_data_value u;
u.string = nl_langinfo (_NL_CTYPE_MB_CUR_MAX);
return ((size_t []) { 1, 1, 1, 2, 2, 3, 4 })[u.word];
}
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