Re: [PATCH v2 5/6] qemu-option: move help handling to get_opt_name_value

[Paolo Bonzini <pbonzini@redhat.com>]

On 09/11/20 20:40, Markus Armbruster wrote:
>>
>> +        p = get_opt_name_value(p, firstname, help_wanted, &option, &value);
>> +        if (help_wanted && *help_wanted) {
>> +            return false;
> 
> Doesn't this leak @option and @value?  Remember, [2]
> get_opt_name_value() always sets *name and *value.

Yes, it does. :(

>>           if (help_wanted) {
>>               qemu_opts_print_help(list, true);
>> -            error_free(err);
>>           } else {
>>               error_report_err(err);
>>           }
> I think we could pass &help_wanted unconditionally, then ignore the
> value of help_wanted if opts_accepts_any().
> 

Unfortunately not, because callers rely on "help" being added to the 
options for !opts_accepts_any.  opts_do_parse however does:

> +        if (help_wanted && *help_wanted) {
> +            return false;
> +        }

You made the same remark on the previous version, but unfortunately I 
couldn't make it actually produce simpler code.

Paolo