[LTP] test specific command line options

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Cyril Hrubis" <chrubis@suse.cz>
> To: "Jan Stancek" <jstancek@redhat.com>
> Cc: "Han Pingtian" <hanpt@linux.vnet.ibm.com>, ltp@lists.linux.it
> Sent: Monday, 1 August, 2016 11:23:56 AM
> Subject: Re: [LTP] test specific command line options
> 
> Hi!
> > > From the doc I read:
> > > 
> > > ... The 'arg' is where 'optarg' is stored upon match. If option has no
> > > parameter it's set to non-'NULL' value if option was present.
> > > 
> > > But looks like if a option was present which has no parameter, the 'arg'
> > > will set to NULL?
> > 
> > You're right, that looks like a BUG. If you don't provide colon,
> > then "arg" stays NULL, but doc say it should be non-NULL:
> 
> Looks like my mistake.
> 
> > diff --git a/lib/tst_test.c b/lib/tst_test.c
> > index 4f417ea345e7..0b99bedd8d81 100644
> > --- a/lib/tst_test.c
> > +++ b/lib/tst_test.c
> > @@ -384,6 +384,7 @@ static void parse_topt(unsigned int topts_len, int opt,
> > char *optarg)
> >  {
> >         unsigned int i;
> >         struct tst_option *toptions = tst_test->options;
> > +       static char *match = "";
> >  
> >         for (i = 0; i < topts_len; i++) {
> >                 if (toptions[i].optstr[0] == opt)
> > @@ -393,7 +394,10 @@ static void parse_topt(unsigned int topts_len, int
> > opt, char *optarg)
> >         if (i >= topts_len)
> >                 tst_brk(TBROK, "Invalid option '%c' (should not happen)",
> >                 opt);
> >  
> > -       *(toptions[i].arg) = optarg;
> > +       if (optarg)
> > +               *(toptions[i].arg) = optarg;
> > +       else
> > +               *(toptions[i].arg) = match;
> 
> I would do something as:
> 
> 	*(toptions[i].arg) = optarg ? optarg : "";

I pushed your version.

Regards,
Jan