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When porting code to ROS you can try to port the software fully or to just write a ROS interface that translates ROS request and calls some interface functions in the software.

When I port code to ROS, what I usually do is:

Create a ROS package using roscreate-pkg.
Copy the source code to the package and make it compile (without any ROS interfacing). This should result in the same program as before.
Add ros stuff, i.e. ros::init, spinning, subscribers/publishers, maybe switch in some ROS features, i.e. using ros::Time, ROS_INFO, etc.

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