A customer was having troubles with some serial I/O under UNIX, and he asked me to look at it. Doing industrial-strength serial I/O in UNIX is somewhat of a black art, and my work with the VSI-FAX UNIX fax system has given me a bit more experience than most. There is no shame in not getting serial I/O right during your first at-bat, but this C++ module was 5000 lines long. In a single file. How on Earth do people think this way? Is there any good rationale for source files this large?

No, VSI/Esker is not the customer