GNU bug report logs - #38642
'C-x RET c' gets stuck in universal-argument loop

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#38642: closed ('C-x RET c' gets stuck in universal-argument loop)
Date: Fri, 20 Dec 2019 22:53:01 +0000

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Your message dated Fri, 20 Dec 2019 17:52:17 -0500
with message-id <jwvpngin1a9.fsf-monnier+emacs <at> gnu.org>
and subject line Re: bug#38642: 'C-x RET c' gets stuck in universal-argument loop
has caused the debbugs.gnu.org bug report #38642,
regarding 'C-x RET c' gets stuck in universal-argument loop
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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38642: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38642
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From: Juri Linkov <juri <at> linkov.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 'C-x RET c' gets stuck in universal-argument loop
Date: Mon, 16 Dec 2019 23:56:08 +0200

emacs -Q
C-x RET c       ;; universal-coding-system-argument
RET             ;; accept default e.g. utf-8-unix
C-u C-b         ;; moves backwards 4 chars
C-b C-b C-b ...

Every C-b still moves backwards 4 chars because it gets stuck with an old
'prefix-arg' in the 'while' loop in 'universal-coding-system-argument'.

It gets out of this loop only on an error such as when point reaches
the beginning of the buffer that signals an error.

PS: this is the simplest reproducible case, but I found this bug
by trying to use 'C-x RET c C-u C-u M-x rgrep' that with two C-u prefixes
allows editing the grep command.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 38642-done <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org>,
 juri <at> linkov.net
Subject: Re: bug#38642: 'C-x RET c' gets stuck in universal-argument loop
Date: Fri, 20 Dec 2019 17:52:17 -0500

> Stefan, any ideas for how to fix this unintended consequence?

I installed a patch which seems to fix it.  We should rewrite this
function completely, but I tried to minimize the changes for now.


        Stefan

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