> Moving main() to the bottom and usage() to the top would eliminate the 
> need to declare them.
I agree here.

> 
> Functions push() and pop() seem to only be used once each.  
> Would it be too bad to have these few lines directly in the du function?

I don't agree here, because I think the code is more clear with them.

Best regards,

-- 
Roberto E. Vargas Caballero
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'Write programs that do one thing and do it well. Write programs to work
together. Write programs to handle text streams, because that is a
universal interface'

(Doug McIlroy)

In Other Words - Don't design like polkit or systemd
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