Re: [help-gengetopt] Re: Gengetopt 2.21 enhancement suggestions

[Lorenzo Bettini]

J. David Bryan wrote:
> Hi Lorenzo,
>
>
> On 15 Oct 2007 at 14:49, Lorenzo Bettini wrote:
>
> > > The attached "gengetopt-2.21-enh-2.diff" suggests an implementation.
> > OK, but, in case, how can someone understand if there's actually an 
> > error...
>
> By checking the return value from the parser.  :-)
>
>
> > ...and print the corresponding error message? 
>
> If we are setting "print_errors" to 0, then we don't want the error message 
> from "getopt_long" but instead want to take some other action.  That action 
> would be indicated by checking optarg, optind, optopt, etc. after the 
> parser returns an error value.
>
>
> > by the way, the print_errors field should default to '1' to be backward
> > compliant
>
> I believe the patch has "print_errors" default to 1 everywhere except in 
> "cmdline_parser_params_init", where it is set to 0 because the manual says 
> it should be ("...returns a dynamically allocated structure with all fields 
> initialized to 0").

Actually setting print_errors to 0 in the _init function causes previous 
code not to work anymore in some cases, and this is quite dangerous 
(e.g., some tests in the testsuite do not print error messages anymore); 
thus I set print_errors to 1 also in the _init function and changed the 
documentation accordingly.

After all, the aim of this structure is to make code using the generated 
parser "resistant" to future enhancements to that structure, so I think 
this is the safest solution :-)

cheers
        Lorenzo

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Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
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