GNU logs - #22910, boring messages

Message sent to bug-guile@HIDDEN:

Subject: bug#22910: read-only setlocale has side effect
Resent-From: Zefram <zefram@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guile@HIDDEN
Resent-Date: Fri, 04 Mar 2016 16:50:01 +0000
Resent-Message-ID: <handler.22910.B.145711015315214 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: 22910 <at> debbugs.gnu.org
Date: Fri, 4 Mar 2016 16:48:59 +0000
From: Zefram <zefram@HIDDEN>
Message-ID: <20160304164859.GE7946@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

A call to setlocale with no second argument is documented to be
a read-only operation, querying the current locale configuration.
In fact it has a side effect of setting the encoding on primordial ports:

$ guile-2.0 -c '(write (port-encoding (current-input-port))) (newline) (setlocale LC_TIME) (write (port-encoding (current-input-port))) (newline)'
#f
"ANSI_X3.4-1968"

Observe that this occurs even if the locale reading operation is for a
category unrelated to character encoding.  The actual decoding behaviour
of read-char is altered in accordance with the reported encoding.
Non-primordial ports opened before or after the setlocale call are
not affected.

-zefram

Message sent:

Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Mailer: MIME-tools 5.505 (Entity 5.505)
Content-Type: text/plain; charset=utf-8
X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Zefram <zefram@HIDDEN>
Subject: bug#22910: Acknowledgement (read-only setlocale has side effect)
Message-ID: <handler.22910.B.145711015315214.ack <at> debbugs.gnu.org>
References: <20160304164859.GE7946@HIDDEN>
X-Gnu-PR-Message: ack 22910
X-Gnu-PR-Package: guile
Reply-To: 22910 <at> debbugs.gnu.org
Date: Fri, 04 Mar 2016 16:50:01 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

Your message has been sent to the package maintainer(s):
 bug-guile@HIDDEN

If you wish to submit further information on this problem, please
send it to 22910 <at> debbugs.gnu.org.

Please do not send mail to help-debbugs@HIDDEN unless you wish
to report a problem with the Bug-tracking system.

--=20
22910: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D22910
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

Message sent to bug-guile@HIDDEN:

Subject: bug#22910: read-only setlocale has side effect
Resent-From: Zefram <zefram@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guile@HIDDEN
Resent-Date: Fri, 04 Mar 2016 19:56:02 +0000
Resent-Message-ID: <handler.22910.B22910.14571213061931 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: 22910 <at> debbugs.gnu.org
Date: Fri, 4 Mar 2016 19:55:00 +0000
From: Zefram <zefram@HIDDEN>
Message-ID: <20160304195500.GA14310@HIDDEN>
References: <20160304164859.GE7946@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20160304164859.GE7946@HIDDEN>
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

Additional information: setlocale's side effect on primordial ports
happens even if the port's encoding has been individually set using
set-port-encoding!.  This means that to maintain a specific encoding on
these ports (other than the locale's nominal encoding, which is likely to
not be binary compatible) it is necessary to set the encoding repeatedly,
before any I/O operation after setlocale might have been called.
Since the read-only mode of setlocale has this effect, and arbitrary
library code might feel entitled to call setlocale for read purposes
without documenting that it does so, this really amounts to setting the
encoding before every I/O operation.

-zefram

Message sent to bug-guile@HIDDEN:

Subject: bug#22910: read-only setlocale has side effect
Resent-From: Andy Wingo <wingo@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guile@HIDDEN
Resent-Date: Sun, 07 Aug 2016 22:00:02 +0000
Resent-Message-ID: <handler.22910.B22910.147060714611415 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: Zefram <zefram@HIDDEN>
Cc: 22910 <at> debbugs.gnu.org
DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:cc
 :subject:references:date:in-reply-to:message-id:mime-version
 :content-type; q=dns; s=sasl; b=lc8LUg3JiNWFKDsA8b5ob9fYW91gn24o
 lovlG4e+1ysrVSltCJNox3anOaSSBiu8bc9XLSXSiLB+0uhJxbyuDgXqo6VrR4GW
 BDN6vEP4GOovo8ZzZXUBndiShcJPGTwACXJu3RBIbUVC16Eg3axNpaqdV1LPBp6l
 nzxgrY+ST4w=
From: Andy Wingo <wingo@HIDDEN>
References: <20160304164859.GE7946@HIDDEN>
Date: Sun, 07 Aug 2016 23:58:57 +0200
In-Reply-To: <20160304164859.GE7946@HIDDEN> (zefram@HIDDEN's message of
 "Fri, 4 Mar 2016 16:48:59 +0000")
Message-ID: <874m6wnsv2.fsf@HIDDEN>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

On Fri 04 Mar 2016 17:48, Zefram <zefram@HIDDEN> writes:

> A call to setlocale with no second argument is documented to be
> a read-only operation, querying the current locale configuration.
> In fact it has a side effect of setting the encoding on primordial ports:

This sounds like a bug indeed :/

Andy

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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