I doubt it, it does look uglier than modern C but it looks like it's written to work in ANSI-C/C89 entirely without any language extensions since then. That's

I doubt it, it does look uglier than modern C but it looks like it's written to work in ANSI-C/C89 entirely without any language extensions since then. That's going to shape things quite a bit (in particular the dense bit of variable declarations at the top of every function) simply because a lot of the things like being able to declare variables later on in the source code just wasn't a thing in that version of the language.