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Asked: 2026-06-04T07:47:23+00:00

I have a 3500 lines long C function written by someone else that i

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I have a 3500 lines long C function written by someone else that i need to break it apart without causing any regression. Since it is in C, the main problem i face is maintaining the state of the variables. For example if i break a small part of the code into another function, i will need to pass 10 arguments. Some of them will actually change inside the code of the new function. So effectively i will need to pass a pointer to them. It becomes very messy. Is there is better way of dealing with such refactoring? Any “best practice”?

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  1. Editorial Team

    Unit testing. Extract small portions of the code that depend on 3 variables or less (1 variable best) and test the hell out of it. Replace that code in original function with a call to new function.

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