+
−/* Determine the number of screen columns needed for a character.
+
−   Copyright (C) 2006-2007, 2010-2015 Free Software Foundation, Inc.
+
−
+
−   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 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 General Public License for more details.
+
−
+
−   You should have received a copy of the GNU 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"
+
−
+
−int
+
−wcwidth (wchar_t wc)
+
−#undef wcwidth
+
−{
+
−  /* In UTF-8 locales, use a Unicode aware width function.  */
+
−  const char *encoding = locale_charset ();
+
−  if (STREQ_OPT (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
+
−    }
+
−}