[NaS]

Just create a new global array and update it everytime you set a vehicle's interior.
Remember vehicle ids start at 1 and not 0, so you have to access the array with vehicleid - 1 or declare the array with MAX_VEHICLES + 1.

Код:

new gVehicleInteriorIDs[MAX_VEHICLES];

n_LinkVehicleToInterior(vehicleid, interior)
{
    LinkVehicleToInterior(vehicleid, interior),
    gVehicleInteriorIDs[vehicleid - 1] = interior;
}
#define LinkVehicleToInterior n_LinkVehicleToInterior

GetVehicleInterior(vehicleid)
{
    return gVehicleInteriorIDs[vehicleid - 1];
}

Make sure to reset the variable when you create new vehicles, otherwise the array could still contain another interior if that slot was used before.