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+/* 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
+ }
+}