GNU bug report logs - #34608
date +%+4C is unimplemented, contrary to POSIX

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eric Blake <eblake <at> redhat.com>
Subject: bug#34608: closed (Re: bug#34608: date +%+4C is unimplemented,
 contrary to POSIX)
Date: Mon, 25 Feb 2019 08:29:02 +0000

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Your bug report

#34608: date +%+4C is unimplemented, contrary to POSIX

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34608 <at> debbugs.gnu.org.

-- 
34608: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34608
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eric Blake <eblake <at> redhat.com>
Cc: 34608-done <at> debbugs.gnu.org
Subject: Re: bug#34608: date +%+4C is unimplemented, contrary to POSIX
Date: Mon, 25 Feb 2019 00:27:47 -0800

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Eric Blake wrote:

> The best I can do is search austingroupbugs.net for all bugs containing
> strftime, which pulls up a current total of 25 issues.

Thanks for doing that. I read through those issues, and the only one that seems 
relevant (i.e., resolved by austingroup but not in Gnulib) is the business with 
the + conversion specification flag. I installed this Gnulib patch to implement 
the flag:

https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=188d87b05190690d6f8b0577ec65ef221a711d08

Then I installed the attached coreutils patches to propagate the Gnulib patch 
into coreutils, and I am marking this coreutils bug as done.

glibc strftime should also support the + conversion specification flag. I filed 
a bug report for that here:

https://sourceware.org/bugzilla/show_bug.cgi?id=24264

[0001-build-update-gnulib-submodule-to-latest.patch (text/x-patch, attachment)]

[0002-date-conversion-specification-flag.patch (text/x-patch, attachment)]

[0003-doc-fix-typo-in-previous-patch.patch (text/x-patch, attachment)]

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From: Eric Blake <eblake <at> redhat.com>
To: bug-coreutils <at> gnu.org
Subject: date +%+4C is unimplemented, contrary to POSIX
Date: Thu, 21 Feb 2019 11:10:06 -0600

POSIX requires the '+' flag in %C to output padding with leading 0, and
additionally to add a +/- indicator if the minimum field width is larger
than 2 bytes.  Thus:

date -d 0001-01-01 +.%+4C.

should produce ".+000.", but currently it produces ".%+4C." because the
+ flag is unimplemented.

See also http://austingroupbugs.net/view.php?id=1184

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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