I would be very gratefull for the links for material with detailed info about creating the API for Text user interface (TUI) [Character User Interface (CUI)] which can be used in console mode even. It is interesting for me how to create such API, it is more interesting then using existing "black box" by other programmers. I didn't find nothing still.
Years ago I found a book ( yes a paper book:) ), called Advanced C Programming for Displays. This explained the basics of creating a text editor with windows and pulldown menus. you can get this book on amazon. I hope this helps.