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50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
/* Return number of characters in multibyte representation for current
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character set.
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Copyright (C) 1996-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <langinfo.h>
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#include <locale.h>
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#include <stdlib.h>
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#include "localeinfo.h"
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/* This is a gross hack to get broken programs running.
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ISO C provides no mean to find out how many bytes the wide
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character representation really uses. But it defines MB_CUR_LEN to
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return the information for the multi-byte character representation.
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Many programmers don't know the difference between the two and
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think this means the same. But assuming all characters have a size
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of MB_CUR_LEN after they have been processed by `mbrtowc' is wrong.
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Instead the maximum number of characters used for the conversion is
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MB_CUR_LEN.
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It is known that some Motif applications have this problem. To
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cure this one has to make sure the glibc uses the function in this
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file instead of the one in locale/mb_cur_max.c. This can either be
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done by linking with this file or by using the LD_PRELOAD feature
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of the dynamic linker. */
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size_t
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__ctype_get_mb_cur_max (void)
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{
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union locale_data_value u;
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u.string = nl_langinfo (_NL_CTYPE_MB_CUR_MAX);
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return ((size_t []) { 1, 1, 1, 2, 2, 3, 4 })[u.word];
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}
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