gistfile1.txt

void
ClearCells(XtermWidget xw, int flags, unsigned len, int row, int col)
{
    if (len != 0) {
	TScreen *screen = TScreenOf(xw);
	LineData *ld;
	unsigned n;

	ld = getLineData(screen, row);

  // mix flags received as argument with actual flags
  // in xw - current attributes set
	flags = (int) ((unsigned) flags | TERM_COLOR_FLAGS(xw));

  // use spaces for clearing cells
	for (n = 0; n < len; ++n)
	    ld->charData[(unsigned) col + n] = (CharData) ' ';

	memset(ld->attribs + col, flags, (size_t) len);

	if_OPT_ISO_COLORS(screen, {
	    CellColor p = xtermColorPair(xw);
	    for (n = 0; n < len; ++n) {
		ld->color[(unsigned) col + n] = p;
	    }
	});
	if_OPT_WIDE_CHARS(screen, {
	    size_t off;
	    for_each_combData(off, ld) {
		memset(ld->combData[off] + col, 0, (size_t) len * sizeof(CharData));
	    }
	});
    }
}