The parsing code isn't even correct, though. I'm sure it works for the current input source code, but it's a clear sign of an LLM developing by iteration, rather than actually understanding the problem and coming up with a correct solution.

How often does "this table of constants was transcribed incorrectly" even come up as a bug class? Is it worth writing a buggy C parser for a failure mode that doesn't happen? Do you expect that Linux is going to change their constant definitions out from under you?