How are the ascii diagrams in RFC's generated?

Question

Not sure if this is the correct stackexchange to ask this question, but I was wondering whether anyone knows if the ascii diagrams in http://tools.ietf.org/rfc/rfc5755.txt page 6 are handcrafted or generated using a program that takes the nodes and transitions as input.

If they are generated, does anyone know which program?

Directly searches on Google do not turn up anything relevant.

Answer 1

I believe that Emacs picture-mode, table-mode (M-x table-insert or M-x table-recognize) and possibly another modes simplify ASCII editing.

Also read about proposal to use PDF formats for RFC:

https://datatracker.ietf.org/doc/html/draft-ash-alt-formats-02

Answer 2

If you prefer, you could also draw ASCII diagrams manually with asciiflow. I find this tool pretty handy from time to time. http://asciiflow.com/