/* Determine the number of screen columns needed for a character.
- Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Get iswprint. */
#include <wctype.h>
+#include "localcharset.h"
+#include "streq.h"
+#include "uniwidth.h"
+
+#undef wcwidth
+
int
rpl_wcwidth (wchar_t wc)
{
- return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
+ /* 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
+ }
}