encode.md

encode.c

Simple exercise for learning C:

• Reads text from STDIN
• By default, rotates all text by one character ("abc" => "bcd")
• Prints to STDOUT
• If the "-n [number]" flag is supplied, rotate by that many characters
• If the "-d" (decode) flag is supplied, rotate in the opposite direction
• If the "-f [filename]" flag is supplied, read from that file rather than STDIN

Extra credit:

• Handle invalid paths gracefully.
• Handle lack of file and STDIN gracefully.

Actually, that second EC might be impossible, just based on the way STDIN works (e.g. run cat by itself -- it just hangs).

Extra credit: make the program write to STDOUT immediately instead of waiting for newlines (e.g. to pipe in the result of tail -f").

What should the behavior be when supplying uppercase characters? Up to the implementer?

Yeah, I'd say.