fixes #240 nngcat is MIA

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.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/nng.c b/src/nng.c
index b906431b..c2e3161d 100644
--- a/src/nng.c
+++ b/src/nng.c
@@ -732,6 +732,8 @@ static const struct {
 	{ NNG_EWRITEONLY, "Write only resource" },
 	{ NNG_ECRYPTO, "Cryptographic error" },
 	{ NNG_EPEERAUTH, "Peer could not be authenticated" },
+	{ NNG_ENOARG, "Option requires argument" },
+	{ NNG_EAMBIGUOUS, "Ambiguous option" },
 	{ NNG_EINTERNAL, "Internal error detected" },
 	{ 0, NULL },
 	// clang-format on