+
−/* Determine number of screen columns needed for a size-bounded wide string.
+
−   Copyright (C) 1999, 2011-2013 Free Software Foundation, Inc.
+
−   Written by Bruno Haible <bruno@clisp.org>, 1999.
+
−
+
−   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/>.  */
+
−
+
−int
+
−wcswidth (const wchar_t *s, size_t n)
+
−{
+
−  int count = 0;
+
−  for (; n > 0; s++, n--)
+
−    {
+
−      wchar_t c = *s;
+
−      if (c == (wchar_t)'\0')
+
−        break;
+
−      {
+
−        int width = wcwidth (c);
+
−        if (width < 0)
+
−          goto found_nonprinting;
+
−        if (width > INT_MAX - count)
+
−          goto overflow;
+
−        count += width;
+
−      }
+
−    }
+
−  return count;
+
−
+
− found_nonprinting:
+
−  return -1;
+
−
+
− overflow:
+
−  return INT_MAX;
+
−}