ins_shift(int c, int lastc)
{
    if (stop_arrow() == FAIL)
	return;
    AppendCharToRedobuff(c);

    /*
     * 0^D and ^^D: remove all indent.
     */
    if (c == Ctrl_D && (lastc == '0' || lastc == '^')
						  && curwin->w_cursor.col > 0)
    {
	--curwin->w_cursor.col;
	(void)del_char(FALSE);		// delete the '^' or '0'
	// In Replace mode, restore the characters that '^' or '0' replaced.
	if (State & REPLACE_FLAG)
	    replace_pop_ins();
	if (lastc == '^')
	    old_indent = get_indent();	// remember curr. indent
	change_indent(INDENT_SET, 0, TRUE, 0, TRUE);
    }
    else
	change_indent(c == Ctrl_D ? INDENT_DEC : INDENT_INC, 0, TRUE, 0, TRUE);

    if (did_ai && *skipwhite(ml_get_curline()) != NUL)
	did_ai = FALSE;
    did_si = FALSE;
    can_si = FALSE;
    can_si_back = FALSE;
    can_cindent = FALSE;	// no cindenting after ^D or ^T
}