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This could be done with a single VT100 escape: print multi-line junk, move the cursor back, print less junky junk, repeat.

(Even with some optimization: for any line that is not changing any more, just emit a CR-LF).

You don't even need to put the TTY into raw mode; no termios calls needed, and \n is your CR-LF.

If you have a better implementation, ship it. Don't trash someone else's work from the sidelines.

edit: OP removed the snark from the comment.

Oooh, good one! Do I have your permission to use it in the code review I'm going into in 30 minutes?

If you were releasing your tool to the reviewer free of charge, absolutely.

Specifically, I removed the text "Seriously?"