static int randart_add_one_property( const item_def &item,
                                     randart_properties_t &proprt )
{
    // This function assumes that no properties have been added to this
    // randart yet.
    const object_class_type cl = item.base_type;
    const int ty = item.sub_type;
    // 0 - ac, 1 - ev, 2 - str, 3 - int, 4 - dex
    int prop;
    int skip = -1;
    // Determine if we need to skip any of the above.
    if (cl == OBJ_ARMOUR || cl == OBJ_JEWELLERY && ty == RING_PROTECTION)
        skip = 0;
    else if (cl == OBJ_JEWELLERY && ty == RING_EVASION)
        skip = 1;
    else if (cl == OBJ_JEWELLERY && ty == RING_STRENGTH)
        skip = 2;
    else if (cl == OBJ_JEWELLERY && ty == RING_INTELLIGENCE)
        skip = 3;
    else if (cl == OBJ_JEWELLERY && ty == RING_DEXTERITY)
        skip = 4;

    // Pick a random enchantment, taking into account the skipped index.
    if (skip >= 0)
    {
        prop = random2(4);
        if (prop >= skip)
            prop++;
    }
    else
    {
        prop = random2(5);
    }
    bool negench = one_chance_in(4);
    switch(prop)
    {
    default:
    case 0:
        if (negench)
            proprt[RAP_AC] -= 1 + random2(3) + random2(3) + random2(3);
        else
            proprt[RAP_AC] = 1 + random2(3) + random2(3) + random2(3);
        break;
    case 1:
        if (negench)
            proprt[RAP_EVASION] -= 1 + random2(3) + random2(3) + random2(3);
        else
            proprt[RAP_EVASION] = 1 + random2(3) + random2(3) + random2(3);
        break;
    case 2:
        if (negench)
            proprt[RAP_STRENGTH] -= 1 + random2(3) + random2(3) 
                + random2(3);
        else
            proprt[RAP_STRENGTH] = 1 + random2(3) + random2(2);
        break;
    case 3:
        if (negench)
            proprt[RAP_INTELLIGENCE] -= 1 + random2(3) + random2(3)
                + random2(3);
        else
            proprt[RAP_INTELLIGENCE] = 1 + random2(3) + random2(2);
        break;
    case 4:
        if (negench)
            proprt[RAP_DEXTERITY] -= 1 + random2(3) + random2(3)
                + random2(3);
        else
            proprt[RAP_DEXTERITY] = 1 + random2(3) + random2(2);
        break;
    }
    return negench ? 0 : 1;
}

    if (randart_wpn_num_props(proprt) == 0)
        power_level += randart_add_one_property(item, proprt);