This is the mail archive of the cygwin mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: getopt required_argument (Was Re: regtool - 1.8 - Core dump)


On Sun, 27 Feb 2005, Igor Pechtchanski wrote:

> On Sat, 26 Feb 2005, Brian Dessent wrote:
>
> > Alexander Joerg Herrmann wrote:
> >
> > > What I was mentioning is that
> > > regtool -K
> > > causes a core fault and something similar under windows because the
> > > argument is broken. I know that the argument is missing and so should
> > > regtool. It should produce a usage message insteed of a crash imo.
> >
> > The program should not core dump on invalid arguments.  That I agree
> > with, and it's a bug that should be fixed.
>
> Well, it's just a matter of adding a check for optarg being NULL and
> printing an appropriate message (e.g.,
>           if (optarg == NULL) {
>             fprintf(stderr, "Missing key-value separator\n");
>             usage();
>           }
> ).
>
> However, the question is what should getopt's behavior be if something
> specified as a "required_argument" is missing?  Should it simply set
> optarg to NULL, just like it does with "optional_argument", or should it
> return an error code of some sort?  Any getopt experts out there?

Whoops, never mind.  It's a bug, pure and simple.  According to
<http://refspecs.freestandards.org/LSB_2.0.0/LSB-generic/LSB-generic/libutil-getopt-3.html>,
two colons after a character indicate an *optional* argument, and for a
required argument one needs to use only one colon.  The only change needed
is that opts[] needs to only have one colon after "K".
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha@cs.nyu.edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor@watson.ibm.com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"The Sun will pass between the Earth and the Moon tonight for a total
Lunar eclipse..." -- WCBS Radio Newsbrief, Oct 27 2004, 12:01 pm EDT

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]