GNU bug report logs - #35920
strftime incorrectly assumes that nstrftime will produce UTF-8

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From: Christopher Lam <christopher.lck <at> gmail.com>
To: Mark H Weaver <mhw <at> netris.org>
Cc: 35920 <at> debbugs.gnu.org
Subject: bug#35920: strftime incorrectly assumes that nstrftime will produce UTF-8
Date: Mon, 27 May 2019 10:04:39 +1000

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Thanks! I'm glad to know this. I have adequate fluency in guile now but
very basic C hence some bugs are very opaque to me.

On Mon., 27 May 2019, 04:43 Mark H Weaver, <mhw <at> netris.org> wrote:

> Hi Christopher,
>
> Christopher Lam <christopher.lck <at> gmail.com> writes:
>
> > Addendum - wish to confirm if guile bug (guile-2.2 on Windows):
> > - set locale to non-Anglo so that (setlocale LC_ALL) returns
> > "French_France.1252"
> > - call (strftime "%B" 4000000) - that's 4x10^6 -- this should return
> > "février 1970"
> >
> > but the following error arises:
> > Throw to key `decoding-error' with args `("scm_from_utf8_stringn" "input
> > locale conversion error" 0 #vu8(102 233 118 114 105 101 114 32 49 57 55
> > 48))'.
> >
> > Is this a bug?
>
> Yes.  Guile's 'strftime' procedure currently assumes that the underlying
> 'nstrftime' C function (from Gnulib) will produce output in UTF-8,
> although it almost certainly produces output in the locale encoding.
> Indeed, the bytevector #vu8(102 233 118 114 105 101 114 32 49 57 55 48)
> represents the characters "février 1970" in Windows-1252 encoding.
>
> I'm CC'ing this reply to <bug-guile <at> gnu.org>, so that a bug ticket will
> be created.  In the future, that's the preferred address for sending bug
> reports.
>
> Anyway, thanks for letting us know about this.  I'll work on it soon.
>
>       Mark
>

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