Index a pointer being passed as a function argument

Hi,

I'd like to generate the following C code structure using Simulink:

function ( arg1, *arg2) {

int index;

loop { anotherLocalVar = arg2[index]; index++ }

}

How can I receive an unknown dimension variable and index it?

Simulink coder wants me to define the dimension.

Is there any workaround for this?

Thanks!!