title: how to read a large file (at most 2 000 000 000 char) and stock them
body: <p>I'm trying to solve a problem, for that I have an input file containing a maze, I know how o solve the maze but I don't know how to stock the maze.
  I can't stock it in a char array because the file can be at most 2 billions char.
  I don't know how to stock the file without exploding the buffer...
  the file is read with the read command (fread isn't allowed).</p>