kilo commentary:

Steps 80-84 of the kilo construction process have to do with rendering tab characters as spaces on the screen. Part of this is converting tab characters to the equivalent number of spaces, which is done by this bit of code:

      row->render[idx++] = ' ';
      while (idx % KILO_TAB_STOP != 0) row->render[idx++] = ' ';

Which... this is equivalent to this, right?

      do
          row->render[idx++] = ' ';
      while (idx % KILO_TAB_STOP != 0);

I mean, I realize that the do-while construct is relatively uncommon to use in C (at least in my experience), but this is a perfect example of where to use it.