Assumes char is signed

[arpruss]

in main(), the getopt() return value is assigned to char c, and then compared against -1. This fails on systems (like my Raspberry PI) where char is unsigned. Instead, c should be declared int.

[sshipway]

yes, good point. This used to work back 40 years ago when I first wrote it! Care to submit a PR to fix?

[arpruss]

I had really enjoyed this about 35 years ago, and so I downloaded it and compiled it today. Worked great on Windows/Cygwin, but then got this hiccup.

I'll see if I can figure out how to do a PR. I haven't yet done any PRs since github disabled svn access.