tools' error output for invalid arg is not helpful

[tedp]

When an invalid argument is provided to avahi tools, the particular argument that is invalid is not displayed. For example:

$ avahi-browse --foo
Invalid command line argument: ?

The following tools are affected:

• avahi-resolve
• avahi-browse
• avahi-set-host-name
• avahi-publish
• avahi-daemon
• avahi-autoipd
• avahi-dnsconfd

The simplest solution is to enable the 'opterr' option (default is on) and let getopt provide an error message. A short patch making this change will be attached.

[lennart]

(In [1358]) Fix error message when passing an invalid command line option (Closes #88)

[lennart]

BTW, I fixed this a little bit defferently than you suggested.

Thank you for your patch!

[tedp]

I found a case where the current (fixed) code is still not helpful. The first example shows a working case, the second shows a failure:

$ ./avahi-autoipd -a
Invalid command line argument: -a
$ ./avahi-autoipd -ab
Invalid command line argument: ./avahi-autoipd

[lennart]

(In [1424]) Fix error message when passing invalid command line arguments. I admit defeat, tedp wins, merging his patch. (Closes #88)