| 1 | /* Internal header containing implementation of wcwidth() function. |
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| 2 | Copyright (C) 1996-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <wchar.h> |
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| 20 | #include <wctype.h> |
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| 21 | #include "../wctype/wchar-lookup.h" |
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| 22 | #include "../locale/localeinfo.h" |
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| 23 | |
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| 24 | /* Table containing width information. */ |
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| 25 | extern const char *__ctype32_width attribute_hidden; |
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| 26 | |
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| 27 | static __inline int |
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| 28 | internal_wcwidth (wchar_t wc) |
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| 29 | { |
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| 30 | unsigned char res; |
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| 31 | |
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| 32 | /* The tables have been prepared in such a way that |
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| 33 | 1. wc == L'\0' yields res = 0, |
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| 34 | 2. !iswprint (wc) implies res = '\xff'. */ |
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| 35 | res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc); |
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| 36 | |
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| 37 | return res == (unsigned char) '\xff' ? -1 : (int) res; |
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| 38 | } |
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| 39 | |
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