diff options
Diffstat (limited to 'lib/wcwidth.c')
-rw-r--r-- | lib/wcwidth.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/wcwidth.c b/lib/wcwidth.c new file mode 100644 index 0000000..8dea611 --- /dev/null +++ b/lib/wcwidth.c @@ -0,0 +1,51 @@ +/* Determine the number of screen columns needed for a character. + Copyright (C) 2006, 2007 Free Software Foundation, Inc. + + This program 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 3 of the License, or + (at your option) any later version. + + This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <wchar.h> + +/* Get iswprint. */ +#include <wctype.h> + +#include "localcharset.h" +#include "streq.h" +#include "uniwidth.h" + +#undef wcwidth + +int +rpl_wcwidth (wchar_t wc) +{ + /* In UTF-8 locales, use a Unicode aware width function. */ + const char *encoding = locale_charset (); + if (STREQ (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0 ,0)) + { + /* We assume that in a UTF-8 locale, a wide character is the same as a + Unicode character. */ + return uc_width (wc, encoding); + } + else + { + /* Otherwise, fall back to the system's wcwidth function. */ +#if HAVE_WCWIDTH + return wcwidth (wc); +#else + return wc == 0 ? 0 : iswprint (wc) ? 1 : -1; +#endif + } +} |