Comment by wrs

Given that busybox is structured as one function per command

    int COMMAND_main(int argc, char **argv)

and that it's compilable as a library already, I wonder if it would make more sense to use bindgen or the like to start with the actual busybox C code, but with a (trivial) Rust main function. You'd have the current busybox source compiling an ever-smaller library, and a Rust lib next to it. Then move things over to the Rust side one command at a time.