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75cd5204 | 1 | /* Internal header containing implementation of wcwidth() function. |
f7a9f785 | 2 | Copyright (C) 1996-2016 Free Software Foundation, Inc. |
33a934a3 UD |
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 | |
41bdb6e2 AJ |
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. | |
33a934a3 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
33a934a3 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
75cd5204 RM |
19 | |
20 | #include <wchar.h> | |
35946fb7 | 21 | #include <wctype.h> |
ef446144 | 22 | #include "../wctype/wchar-lookup.h" |
0f283ffc | 23 | #include "../locale/localeinfo.h" |
75cd5204 | 24 | |
4c7d276e | 25 | /* Table containing width information. */ |
20febd6a | 26 | extern const char *__ctype32_width attribute_hidden; |
75cd5204 RM |
27 | |
28 | static __inline int | |
b6d64fb0 | 29 | internal_wcwidth (wchar_t wc) |
75cd5204 | 30 | { |
4c7d276e UD |
31 | unsigned char res; |
32 | ||
4a9dcff1 UD |
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'. */ | |
0f283ffc | 36 | res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc); |
4a9dcff1 | 37 | |
4c7d276e | 38 | return res == (unsigned char) '\xff' ? -1 : (int) res; |
75cd5204 | 39 | } |