| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Internal header containing implementation of wcwidth() function. |
| 2 | Copyright (C) 1996-2016 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 Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the 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 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <wchar.h> |
| 21 | #include <wctype.h> |
| 22 | #include "../wctype/wchar-lookup.h" |
| 23 | #include "../locale/localeinfo.h" |
| 24 | |
| 25 | /* Table containing width information. */ |
| 26 | extern const char *__ctype32_width attribute_hidden; |
| 27 | |
| 28 | static __inline int |
| 29 | internal_wcwidth (wchar_t wc) |
| 30 | { |
| 31 | unsigned char res; |
| 32 | |
| 33 | /* The tables have been prepared in such a way that |
| 34 | 1. wc == L'\0' yields res = 0, |
| 35 | 2. !iswprint (wc) implies res = '\xff'. */ |
| 36 | res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc); |
| 37 | |
| 38 | return res == (unsigned char) '\xff' ? -1 : (int) res; |
| 39 | } |