No mana spent in Protection Zone

[Demonder]

Hello guys.
I'm in doubt if it is possible.
I use a server 8.57 (TFS 0.3.6) and i wanna know if is possible to make players do not gain mana spent when use any spell in Protection Zone, buy only out of the same.
Could someone give me an idea where to start? or if possible make a simple example?

Thanks
Att Demonder

 

[Cykotitan]

spells.cpp

void Spell::postCastSpell(Player* player, uint32_t manaCost, uint32_t soulCost) const
{
	if(manaCost > 0)
	{
		player->changeMana(-(int32_t)manaCost);
		if(!player->hasFlag(PlayerFlag_NotGainMana) [B][COLOR="red"]&& player->getZone() != ZONE_PROTECTION[/COLOR][/B] && (player->getZone() != ZONE_PVP
			|| g_config.getBool(ConfigManager::PVPZONE_ADDMANASPENT)))
			player->addManaSpent(manaCost);
	}

	if(soulCost > 0)
		player->changeSoul(-(int32_t)soulCost);
}