/* set clipboard copy format */
_setcbf(m, v)
{
        local cbf;

        /* get format */
        cbf = castint(getconf("CLIPBOARD_COPYFORMAT"));

        /* clear bit */
        cbf &= ~m;

        /* set bit */
        if (v) cbf |= m;

        setconf("CLIPBOARD_COPYFORMAT", strnum(cbf));
}