| /* Internal header containing implementation of wcwidth() function. |
| Copyright (C) 1996-2016 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <wchar.h> |
| #include <wctype.h> |
| #include "../wctype/wchar-lookup.h" |
| #include "../locale/localeinfo.h" |
| |
| /* Table containing width information. */ |
| extern const char *__ctype32_width attribute_hidden; |
| |
| static __inline int |
| internal_wcwidth (wchar_t wc) |
| { |
| unsigned char res; |
| |
| /* The tables have been prepared in such a way that |
| 1. wc == L'\0' yields res = 0, |
| 2. !iswprint (wc) implies res = '\xff'. */ |
| res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc); |
| |
| return res == (unsigned char) '\xff' ? -1 : (int) res; |
| } |