Function lua_get_CAN_device

libraries/AP_Scripting/lua_bindings.cpp:690–718

#if AP_SCRIPTING_CAN_SENSOR_ENABLED
int lua_get_CAN_device(lua_State *L) {

    // Allow : and . access
    const int arg_offset = (luaL_testudata(L, 1, "CAN") != NULL) ? 1 : 0;

    binding_argcheck(L, 1 + arg_offset);

    const uint32_t raw_buffer_len = get_uint32(L, 1 + arg_offset, 1, 25);
    const uint32_t buffer_len = static_cast<uint32_t>(raw_buffer_len);

    auto *scripting = AP::scripting();

    if (scripting->_CAN_dev == nullptr) {
        scripting->_CAN_dev = NEW_NOTHROW ScriptingCANSensor(AP_CAN::Protocol::Scripting);
        if (scripting->_CAN_dev == nullptr) {
            return luaL_argerror(L, 1, "CAN device nullptr");
        }
    }

    if (!scripting->_CAN_dev->initialized()) {
        // Driver not initialized, probably because there is no can driver set to scripting
        // Return nil
        return 0;
    }

    *new_ScriptingCANBuffer(L) = scripting->_CAN_dev->add_buffer(buffer_len);

    return 1;
}

int lua_get_CAN_device2(lua_State *L) {