Hate Spell Item (Bane Weapon) v0.2

//Hate Spell, v0.2; 5th August, 2019; ZoriaRPG
//Spell Item to increase weapon power of a specific itemclass while the item is active.
//D0: A sound to play as an error...
//D1: The item class to use. Defaults to IC_SWORD.
//D2: Damage Multiplier

//Item Editor Fields
// Cost Counter: The counter to check.
// Cost: The cost to apply per revolution.
// Timer: The number of frames to wait before checking the cost.

item script hatespell
{
    bool isRunning = false; //script-global
    //Did I build item script spam prevention into the engine, so that a player can't cause an item already
    //running a script to restart the script with a second use of that item while the first
    //instance is still running?
    void run(int errSfx, int affectedItemClass, float power_multiplier)
    {
        int f;
        bool quit_by_button_press;
        affectedItemClass = ( affectedItemClass > 0 ) affectedItemClass : IC_SWORD;
        power_multiplier = ( power_multiplier > 0 ) power_multiplier : 1.5000;
        int tempitmpower[256];

        if ( isRunning ) //need to kill it early, don't run twice
        {
            Audio->PlaySound(this->UseSound); //Play the use sound again, when deactivating.
            for ( int q = 0; q < 256; ++q )
            {
                itemdata theItem = Game->LoadItemData(q);
                if ( theItem->Class == affectedItemClass )
                {
                    if ( tempitmpower[q] )
                    {
                        theItem->Power = tempitmpower[q]-1;
                    }
                }
            }
            isRunning = false;
            Quit();
        }

        if ( Game->Counter[this->CostCounter] < this->Cost )
        {
            Audio->PlaySound(errSfx); Quit(); //If we can't pay the cost, quit.
        }
        else
        {
            isRunning = true; //mark as active so that we can't spam it.
        }

        for ( int q = 0; q < 256; ++q )
        {
            itemdata theItem = Game->LoadItemData(q);
            if ( theItem->Class == affectedItemClass )
            {
                tempitmpower[q] = theItem->Power+1;
                theItem->Power *= power_multiplier;
            }
        }
        while(1)
        {
            ++f;
            if ( f < 0 ) f = 1; //fix underflows
            if ( (!(f%this->CostTimer)) ) //every n frames, apply the cost
            {
                if((Game->Counter[this->CostCounter] -= this->Cost) > 0)
                {
                    Waitframe();
                }
                else break;
            }
            if (( Hero->PressA && Hero->ItemA == this->ID ) ||( Hero->PressB && Hero->ItemB == this->ID ) || quit_by_button_press )
            {
                break; ///Using the item again, ends its effect.
            }
            Waitframe();
        }

        Audio->PlaySound(this->UseSound); //Play the use sound again, when deactivating.
        //Restore original item Power values, as the effect has ended.
        for ( int q = 0; q < 256; ++q )
        {
            itemdata theItem = Game->LoadItemData(q);
            if ( theItem->Class == affectedItemClass )
            {
                if ( tempitmpower[q] )
                {
                    theItem->Power = tempitmpower[q]-1;
                }
            }
        }
        Quit();
    }

}