str_to_slot
err = str_to_slot(buf, &domain, &bus, &slot, &func);
err = str_to_slot(buf, &domain, &bus, &slot, &func);
err = str_to_slot(buf, &domain, &bus, &slot, &func);
err = str_to_slot(buf, &domain, &bus, &slot, &func);
err = str_to_slot(buf, &domain, &bus, &slot, &func);