Quote:

  #define MAXIN 128  // max cell input length
  enum { EMPTY, NUM, LABEL, FORMULA };  // cell types
  struct cell {
    int type;
    float val;
    char text[MAXIN];  // raw user input
  };
  #define NCOL 26    // max number of columns (A..Z)
  #define NROW 50    // max number of rows
  struct grid {
    struct cell cells[NCOL][NROW];
  };

I doubt that 171 KB of static allocation would fly on an Apple II! I do wonder how they did memory allocation, it must have been tricky with all the fragmentation.

Are there good command-line interfaces for spreadsheets? I don't do anything super financially-important and I'd prefer to stay in the terminal for quick editing of things, especially if I can have Vi keybindings.

Kinda cool to see... TBH, I'd be more inclined to reach for Rust and Ratatui myslf over C + ncurses. I know this would likely be a much larger executable though.

With MS Edit resurrected similarly, I wonder how hard it would be to get a flushed out text based spreadsheet closer in function to MS Excel or Lotus 123 versions for DOS, but cross platform. Maybe even able to load/save a few different formats from CSV/TSV to XLSX (without OLE/COM embeds).

Other open source command line spreadsheets:

  https://github.com/drclcomputers/GoSheet
  https://github.com/xi/spreadsheet/
  https://github.com/andmarti1424/sc-im
  https://github.com/saulpw/visidata
  https://github.com/bgreenwell/xleak
  https://github.com/SamuelSchlesinger/tshts
  https://github.com/CodeOne45/vex-tui