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* fixes #240 nngcat is MIAGarrett D'Amore2018-02-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is intended to provide compatibility with, and has been tested against, legacy nanocat. There are a few differences though. At this time support for the alias names (where argv[0] is set to something like nngreq or somesuch) is missing. By default this library operations without NNG_FLAG_NONBLOCK on dial and listen, so that failures here are immediately diagnosable. (This behavior can be changed with the --async flag.) By default --pair means PAIRv1, but you can specify --pair0 or --pair1 explicitly. (There is also a --compat mode, and in that mode --pair means PAIRv0. The --compat mode also turns on NNG_FLAG_NONBLOCK by default.) The "quoted" mode also quotes tabs. (Legacy nanocat did not.) It is possible to connect to *multiple* peers by using the --dial or --listen (or similar) options multiple times. Shorthands can be used for long options that are not ambiguous. For example, --surv can be used to mean surveyor, but --re is invalid because it can mean req, rep, or respondent. We assume you have a reasonable standard C environment. This won't work in embedded environments without support for FILE *. TLS options are missing but to be added soon. A man page is still to be written.
* Add nng_opts_parse() API for handling command line options.Garrett D'Amore2018-02-22
We have implemented this alternative to getopt() so that we can create nngcat. The reason we did not just use getopt() is that getopt() does not understand long options (which nanocat uses, and we want to preserve for compatibility) and getopt() is not available on Windows (and possibly other non-POSIX platforms.) This function handles long and short options, but does not have support for option clustering. It also is threadsafe & reentrant, unlike getopt.