Date: Sun, 18 Jan 2015 19:27:23 +0100 From: Felix Janda <felix.janda@...teo.de> To: musl@...ts.openwall.com Subject: Re: getopt_long_only and slightly unambiguous options Rich Felker wrote: > On Sun, Jan 18, 2015 at 06:51:59PM +0100, Felix Janda wrote: > > Hello, > > > > since widl from wine uses the combination, get_opt_long_only seems to > > be supposed to be able to differentiate between a short option "-h" > > and a long option "--help". Together with the possibility of option > > abbreviations, the behavior we are trying to copy is: > > > > -h -> -h > > --help -> --help > > -help -> --help > > -he -> --help > > --h -> --help > > > > However musl maps all of them to --help. > > > > The man page is ambiguous about this aspect and I'm not sure if the > > BSDs have the same behavior here. (However I would suspect that the > > breakage in widl, when the --help option was added in 2012, would > > have been noticed.) As always, it is hard to measure how many > > applications (and scripts written against these applications) might > > depend on this behavior. Since getopt_long_only is discouraged > > maybe these are actually quite few, though. > > > > All in all I think that this a bug in musl which should be fixed. > > > > > > For the implementation, is it maybe enough in __getopt_long_core to > > pass options starting with '-' and of exactly two characters > > directly to getopt? > > I would think getopt_long_only would even want to treat "-he" as "-h" > and "-e", i.e. abbreviations should be suppressed entirely when only a > single leading "-" appears instead of "--". However I'd rather follow > historical practice unless it's something stupid and complex (and > violating the principle of least surprise for users) like checking > whether each char is a valid short option and basing the decision on > that. I've just checked that even when there are both -h and -e short options glibc getopt_long_only treats -he as --help. Felix
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