On 01/11/2014 03:05 PM, mmann78@xxxxxxxxxxxx wrote:
Patch committed to rev 54697.
The issue with tfshark -V option isn't the option itself, its the
OPTSTRING string. I stripped it down from tshark (removing options
that shouldn't be supported in tfshark) and apparently "broke" the
string pattern so that getopt isn't parsing the options correctly. As a
test, I restored it to the current tshark OPTSTRING and the -V option
worked just fine.
Can someone point me to where I can understand the OPTSTRING syntax?
The :'s seem arbitrary to me.
man -s 3 getopt ?
A bit from the Linux version:
optstring is a string containing the legitimate option characters. If
such a character is followed by a colon, the option requires an argu‐
ment, so getopt() places a pointer to the following text in the same
argv-element, or the text of the following argv-element, in optarg.
Two colons mean an option takes an optional arg; if there is text in
the current argv-element (i.e., in the same word as the option name
itself, for example, "-oarg"), then it is returned in optarg, otherwise
optarg is set to zero. This is a GNU extension. If optstring contains
W followed by a semicolon, then -W foo is treated as the long option
--foo. (The -W option is reserved by POSIX.2 for implementation exten‐
sions.) This behavior is a GNU extension, not available with libraries
before glibc 2.
