BigDecimal#quo

static VALUE
BigDecimal_quo(int argc, VALUE *argv, VALUE self)
{
    VALUE value, digits, result;
    SIGNED_VALUE n = -1;

    argc = rb_scan_args(argc, argv, "11", &value, &digits);
    if (argc > 1) {
        n = check_int_precision(digits);
    }

    if (n > 0) {
        result = BigDecimal_div2(self, value, digits);
    }
    else {
        result = BigDecimal_div(self, value);
    }

    return result;
}