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

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From: Mark H Weaver <mhw <at> netris.org>
To: Christopher Lam <christopher.lck <at> gmail.com>
Cc: 35920 <at> debbugs.gnu.org
Subject: bug#35920: strftime incorrectly assumes that nstrftime will produce UTF-8
Date: Sun, 26 May 2019 16:41:57 -0400

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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