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glibc  2.9
wcwidth.h
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00001 /* Internal header containing implementation of wcwidth() function.
00002    Copyright (C) 1996,1997,1999,2000,2001,2002 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <wchar.h>
00022 #include <wctype.h>
00023 #include "../wctype/wchar-lookup.h"
00024 #include "../locale/localeinfo.h"
00025 
00026 /* Table containing width information.  */
00027 extern const char *__ctype32_width attribute_hidden;
00028 
00029 static __inline int
00030 internal_wcwidth (wchar_t wc)
00031 {
00032   unsigned char res;
00033 
00034   /* The tables have been prepared in such a way that
00035      1. wc == L'\0' yields res = 0,
00036      2. !iswprint (wc) implies res = '\xff'.  */
00037   res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc);
00038 
00039   return res == (unsigned char) '\xff' ? -1 : (int) res;
00040 }