When getopt or getopt_long encounters an illegal option, it stores the offending option character in optopt. When the illegal option is a long option, where can I find out what the option was? And does anything meaningful get stored in optopt then?
I've set opterr = 0 to suppress the automatically printed error message. I want to create my own message that I can print or log where I'd like, but I want to include the name of the unrecognized option.
The closest I can find is that if you get a BADCH return the argv item that caused it is in argv[optind-1]. Seems like there should be a better way to find the problem argument.