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/* Internal header containing implementation of wcwidth() function.
Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <wchar.h>
#include <wctype.h>
#include "../wctype/cname-lookup.h"
/* Array containing width information. */
extern unsigned char *__ctype_width;
/* If the program is compiled without optimization the following declaration
is not visible in the header. */
extern unsigned int *__ctype32_b;
static __inline int
internal_wcwidth (wint_t ch)
{
size_t idx;
unsigned char res;
if (ch == L'\0')
return 0;
idx = cname_lookup (ch);
if (idx == ~((size_t) 0) || (__ctype32_b[idx] & _ISwprint) == 0)
return -1;
res = __ctype_width[idx];
return res == (unsigned char) '\xff' ? -1 : (int) res;
}
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