I think the bit I was remembering was the Terminfo Case Study on page 149 of the Art of Unix Programming - https://citeseerx.ist.psu.edu/viewdoc/download?doi=10

I think the bit I was remembering was the Terminfo Case Study on page 149 of the Art of Unix Programming - https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.629.5901&rep=rep1&type=pdf https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.62... - read it a long time ago though and re-reading now, it's not exactly what I was remembering but that's memory for you...