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40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* Internal header containing implementation of wcwidth() function.
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Copyright (C) 1996-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
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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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<http://www.gnu.org/licenses/>. */
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#include <wchar.h>
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#include <wctype.h>
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#include "../wctype/wchar-lookup.h"
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#include "../locale/localeinfo.h"
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/* Table containing width information. */
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extern const char *__ctype32_width attribute_hidden;
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static __inline int
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internal_wcwidth (wchar_t wc)
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{
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unsigned char res;
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/* The tables have been prepared in such a way that
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1. wc == L'\0' yields res = 0,
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2. !iswprint (wc) implies res = '\xff'. */
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res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc);
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return res == (unsigned char) '\xff' ? -1 : (int) res;
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}
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