C isn't an OOP language, as your rightly point out, so there's no built-in way to write a true class. You're best bet is to look at structs, and function pointers, these will let you build an approximation of a class. However, as C is procedural you might want to consider writing more C-like code (i.e. without trying to use classes).
Also, if you can use C, you can probally use C++ and get classes.
