splitting First names to tow different fields

Hi Sap All.

I have got a requirement in an Idoc to File Interface where I need to take employee First names field from Source and pass it to two different fields .

First names (sagar ravi kumar) - > First_nam(sagar)

First names (sagar ravi kumar) - > Secnond_names ( ravi kumar).

the only hint we got here is Space -> the second name should start with first space and end to until the string is finished).

can any one help me in this.

must I go for UDF to achieve this in mapping.

Regards.

Jagdish.