XS(XS_Device__USB_libusb_get_descriptor)
{
    dXSARGS;
    if (items != 5)
        Perl_croak(aTHX_ "Usage: Device::USB::libusb_get_descriptor(dev, type, index, buf, size)");
    {
        void *  dev = INT2PTR(void *,SvIV(ST(0)));
        unsigned char   type = (unsigned char)SvUV(ST(1));
        unsigned char   index = (unsigned char)SvUV(ST(2));
        void *  buf = INT2PTR(void *,SvIV(ST(3)));          // <-- !!
        int     size = (int)SvIV(ST(4));
        int     RETVAL;
        dXSTARG;

        RETVAL = libusb_get_descriptor(dev, type, index, buf, size);
        XSprePUSH; PUSHi((IV)RETVAL);
    }
    XSRETURN(1);
}