[Haskell-cafe] Porting setlocale to Windows
sven.bartscher at weltraumschlangen.de
Fri Jan 2 09:46:25 UTC 2015
But the result of categoryToCInt is, normally guaranteed to return a
result that you can pass to setlocale, which isn't satisfied in this
On Fri, 2 Jan 2015 10:32:01 +0200
Alexey Shmalko <rasen.dubi at gmail.com> wrote:
> According to man 3 setlocale:
> > The setlocale() function returns NULL and
> > fails to change the locale if the given combi-
> > nation of category and locale makes no sense.
> So, returning Nothing seems just fine for me.
> I believe categoryToCInt can return any CInt, because it's result is
> implementation detail. I mean, applications can't make any assumption
> based on result of categoryToCInt. That's why changing it (while
> keeping its type) shouldn't break anything.
> 2015-01-02 0:57 GMT+02:00 Sven Bartscher <sven.bartscher at weltraumschlangen.de>:
> > I assume that "do nothing", means that a call to
> > `setLocale LC_MESSAGES x` always returns Nothing (which may confuse
> > some applications, but maybe it does in the right way).
> > Then there's the question left, what categoryToCInt does. I could
> > change it's signature to `Category -> Maybe CInt`, but that would mean
> > breaking the API. Instead I could make say
> > `categoryToCInt LC_MESSAGES = -1`, which may confuse some applications
> > which assume that categoryToCInt returns valid integers. But I guess,
> > that's not that much of a problem, since categoryToCInt is not really
> > often used in packages other than setlocale itself.
> > Regards
> > Sven
> > On Fri, 2 Jan 2015 00:13:58 +0200
> > Alexey Shmalko <rasen.dubi at gmail.com> wrote:
> >> Hi,
> >> The third option is to make `setLocale LC_MESSAGES` do nothing. I believe,
> >> it's perfectly acceptable in this case and is much better than making it an
> >> error.
> >> Regards,
> >> Alexey
> >> 2015-01-01 21:45 GMT+02:00 Sven Bartscher <
> >> sven.bartscher at weltraumschlangen.de>:
> >> > Greetings,
> >> >
> >> > A while ago I took over the packages setlocale.
> >> > I now would like to make it portable to windows, but came across the
> >> > problem that LC_MESSAGES isn't defined on mingw.
> >> > I thought about these options, for solving this:
> >> > - Not defining LC_MESSAGES, which would mean, every package using
> >> > LC_MESSAGES wouldn't be portable to windows.
> >> > - Defining LC_MESSAGES as some an error, which would basically have
> >> > the same problem as above.
> >> >
> >> > I don't like either of these solutions, but don't know any better.
> >> > I would be happy about suggestions.
> >> >
> >> > Regards
> >> > Sven
> >> >
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> >> >
> >> >
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