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glibc/locale/broken_cur_max.c
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/* Return number of characters in multibyte representation for current | |
character set. | |
Copyright (C) 1996-2016 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 | |
<http://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]; | |
} |