[Alan Anderson]

I don't fully understand what your question says, but I think I can figure out why you're asking it.

Would it be sufficient for your purpose if there were a function that took two angles and added a multiple of 360 degrees to the first angle so that it was within 180 degrees of the second one?

Or maybe you want to subtract two angles and modify the difference by adding a multiple of 360 degrees so that it was within the range -180 to +180?