wcsmbs/wcwidth.h

   1 /* Internal header containing implementation of wcwidth() function.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <wchar.h>
  22 #include "../wctype/cname-lookup.h"
  23
  24 /* Array containing width information.  */
  25 extern unsigned char *__ctype_width;
  26
  27 static __inline int
  28 internal_wcwidth (wint_t ch)
  29 {
  30   size_t idx;
  31
  32   if (ch == L'\0')
  33     return 0;
  34
  35   idx = cname_lookup (ch);
  36   if (idx == ~((size_t) 0))
  37     return -1;
  38
  39   return (int) __ctype_width[idx];
  40 }