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

Previous Next

Full log

Message #27 received at 35920 <at> debbugs.gnu.org (full text, mbox):

From: John Cowan <cowan <at> ccil.org>
To: Mark H Weaver <mhw <at> netris.org>
Cc: 35920 <at> debbugs.gnu.org, Christopher Lam <christopher.lck <at> gmail.com>,
 Ludovic Courtès <ludo <at> gnu.org>
Subject: Re: bug#35920: strftime incorrectly assumes that nstrftime will
 produce UTF-8
Date: Sun, 30 Jun 2019 18:37:26 -0400

[Message part 1 (text/plain, inline)]

That's a mug's game: I've been there and tried it (not in Scheme). I
recommend writing a strftime in Scheme from scratch.  It's not that hard;
the most annoying thing is getting into the locale files to handle the
locale-sensitive directives (month name, weekday name, AM/PM, and the
ordering of dates).


On Sun, Jun 30, 2019 at 5:14 PM Mark H Weaver <mhw <at> netris.org> wrote:

> reopen 35920
> thanks
>
> Hi Ludovic,
>
> > Mark H Weaver <mhw <at> netris.org> skribis:
> >
> >> Here's a patch that might fix the problem, but I don't have time to test
> >> it right now.
> >
> > It works! :-)  I wrote tests and pushed it as
> > ab2fd70ef1e36c6532128b73082809ef3c056556.
>
> On my system, I found that my proposed patch caused one of the existing
> tests to fail.  The problem is that if the format string includes
> characters that are not representable in the current locale encoding, it
> will fail.  It seems to me that this could break existing code that
> currently works.  User code that uses 'strftime' might never encode the
> resulting string in the locale encoding.
>
> I was planning to rewrite the code to scan for the '%' escapes
> ourselves, to call 'strftime' for each escape sequence (without
> including the surrounding text), and to concatenate the results.
>
> > I forgot to change the commit author to you before pushing, apologies!
>
> No worries.  Thanks for working on it.
>
>       Mark
>
>
>
>

[Message part 2 (text/html, inline)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.