Making message go to battle log

[bWolfie 140]

So I currently have this clif->message which displays in your chat when you cast a certain skill. It only goes to the public log and I want it to go to 'Battle Message' (using 20141022 client).

 

I noticed in msgstring it has these lines:

 [%s] deal '%d' damage on you.#
 [%s] received damage from [%s] with '%d' damage.#
 [%s] received '%d' damage.#
 [%s] deal damage to [%s] with '%d' damage.#

Where can I find it in the source to send a message like this? Because I want the message to only appear as a Battle Message.

 

To reiterate, I want to display my custom message so it appears as a battle message like this:

 

Thanks