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| 1 /* Determine the number of screen columns needed for a character. |
| 2 Copyright (C) 2006, 2007 Free Software Foundation, Inc. |
| 3 |
| 4 This program is free software: you can redistribute it and/or modify |
| 5 it under the terms of the GNU General Public License as published by |
| 6 the Free Software Foundation; either version 3 of the License, or |
| 7 (at your option) any later version. |
| 8 |
| 9 This program is distributed in the hope that it will be useful, |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 GNU General Public License for more details. |
| 13 |
| 14 You should have received a copy of the GNU General Public License |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 |
| 17 #include <config.h> |
| 18 |
| 19 /* Specification. */ |
| 20 #include <wchar.h> |
| 21 |
| 22 /* Get iswprint. */ |
| 23 #include <wctype.h> |
| 24 |
| 25 #include "localcharset.h" |
| 26 #include "streq.h" |
| 27 #include "uniwidth.h" |
| 28 |
| 29 #undef wcwidth |
| 30 |
| 31 int |
| 32 rpl_wcwidth (wchar_t wc) |
| 33 { |
| 34 /* In UTF-8 locales, use a Unicode aware width function. */ |
| 35 const char *encoding = locale_charset (); |
| 36 if (STREQ (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0 ,0)) |
| 37 { |
| 38 /* We assume that in a UTF-8 locale, a wide character is the same as a |
| 39 Unicode character. */ |
| 40 return uc_width (wc, encoding); |
| 41 } |
| 42 else |
| 43 { |
| 44 /* Otherwise, fall back to the system's wcwidth function. */ |
| 45 #if HAVE_WCWIDTH |
| 46 return wcwidth (wc); |
| 47 #else |
| 48 return wc == 0 ? 0 : iswprint (wc) ? 1 : -1; |
| 49 #endif |
| 50 } |
| 51 } |
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