How to modify skill calculate

[jqkeric11]

If i want to modify skill calculate

What i should do now ?

[Promise]

battle.c

static int64 battle_calc_base_damage(struct status_data *status, struct weapon_atk *wa, struct status_change *sc, unsigned short t_size, struct map_session_data *sd, int flag)
{
	unsigned int atkmin = 0, atkmax = 0;
	short type = 0;
	int64 damage = 0;

	if (!sd) { //Mobs/Pets
		if(flag&4) {
			atkmin = status->matk_min;
			atkmax = status->matk_max;
		} else {
			atkmin = wa->atk;
			atkmax = wa->atk2;
		}
		if (atkmin > atkmax)
			atkmin = atkmax;
	} else { //PCs
		atkmax = wa->atk;
		type = (wa == &status->lhw)?EQI_HAND_L:EQI_HAND_R;

		if (!(flag&1) || (flag&2)) { //Normal attacks
			atkmin = status->dex;

			if (sd->equip_index[type] >= 0 && sd->inventory_data[sd->equip_index[type]])
				atkmin = atkmin*(80 + sd->inventory_data[sd->equip_index[type]]->wlv*20)/100;

			if (atkmin > atkmax)
				atkmin = atkmax;

			if(flag&2 && !(flag&16)) { //Bows
				atkmin = atkmin*atkmax/100;
				if (atkmin > atkmax)
					atkmax = atkmin;
			}
		}
	}

	if (sc && sc->data[SC_MAXIMIZEPOWER])
		atkmin = atkmax;

	//Weapon Damage calculation
	if (!(flag&1))
		damage = (atkmax>atkmin? rnd()%(atkmax-atkmin):0)+atkmin;
	else
		damage = atkmax;

	if (sd) {
		//rodatazone says the range is 0~arrow_atk-1 for non crit
		if (flag&2 && sd->bonus.arrow_atk)
			damage += ( (flag&1) ? sd->bonus.arrow_atk : rnd()%sd->bonus.arrow_atk );

		// Size fix only for players
		if (!(sd->special_state.no_sizefix || (flag&8)))
			damage = damage * (type == EQI_HAND_L ? sd->left_weapon.atkmods[t_size] : sd->right_weapon.atkmods[t_size]) / 100;
	}

	//Finally, add baseatk
	if(flag&4)
		damage += status->matk_min;
	else
		damage += status->batk;

	//rodatazone says that Overrefine bonuses are part of baseatk
	//Here we also apply the weapon_damage_rate bonus so it is correctly applied on left/right hands.
	if(sd) {
		if (type == EQI_HAND_L) {
			if(sd->left_weapon.overrefine)
				damage += rnd()%sd->left_weapon.overrefine+1;
			if (sd->weapon_damage_rate[sd->weapontype2])
				damage += damage * sd->weapon_damage_rate[sd->weapontype2] / 100;
		} else { //Right hand
			if(sd->right_weapon.overrefine)
				damage += rnd()%sd->right_weapon.overrefine+1;
			if (sd->weapon_damage_rate[sd->weapontype1])
				damage += damage * sd->weapon_damage_rate[sd->weapontype1] / 100;
		}
	}

#ifdef RENEWAL
	if (flag&1)
		damage = (damage * 14) / 10;
#endif

	return damage;
}

Here you can edit the damage calc as you want, but we need to know wich part you want to edit.

[Aureon]

What do you mean by skill calculate? Are you referring to modify skill damage?
If that's what you're looking for, you can find it in src/map/battle.c or you can also this, db/skill_damage_db.txt (be sure you uncomment this line on src/config/core.h coz rAthena disabled it by default, then recompile it to take effect)

[Stolao]

can we move this to source request/support ty