46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* Internal header containing implementation of wcwidth() function.
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Copyright (C) 1996, 1997, 1999 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <wchar.h>
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#include <wctype.h>
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#include "../wctype/cname-lookup.h"
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/* Array containing width information. */
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extern unsigned char *__ctype_width;
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/* If the program is compiled without optimization the following declaration
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is not visible in the header. */
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extern unsigned int *__ctype32_b;
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static __inline int
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internal_wcwidth (wint_t ch)
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{
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size_t idx;
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if (ch == L'\0')
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return 0;
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idx = cname_lookup (ch);
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if (idx == ~((size_t) 0) || (__ctype32_b[idx] & _ISwprint) == 0)
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return -1;
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return (int) __ctype_width[idx];
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}
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