GNU bug report logs - #35209
Bug in zdiff argument of an option separated by a space is not handled correctly

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#35209: closed (Bug in zdiff argument of an option separated
 by a space is not handled correctly)
Date: Tue, 29 Mar 2022 23:55:02 +0000

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Your message dated Tue, 29 Mar 2022 16:53:58 -0700
with message-id <d21dfc62-96b1-1d61-cf18-eee6d4031d06 <at> cs.ucla.edu>
and subject line Re: bug#35209: Bug in zdiff argument of an option separated by a space is not handled correctly
has caused the debbugs.gnu.org bug report #35209,
regarding Bug in zdiff argument of an option separated by a space is not handled correctly
to be marked as done.

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From: Bram Mertens <mertensb.mazda <at> gmail.com>
To: bug-gzip <at> gnu.org
Subject: Bug in zdiff argument of an option separated by a space is not
 handled correctly
Date: Tue, 9 Apr 2019 16:11:14 +0200

Hi,

The zdiff script does not handle options with arguments separated by a
space correctly.

The following if a valid diff command: "diff -y -W 200 /tmp/b1 /tmp/b2".
But when passed to zdiff the space between "-W" and 200 causes the
COLUMNS argument to be interpreted as a file:
zdiff -y -W 200 /tmp/b1 /tmp/b2
/bin/zdiff: 72: /bin/zdiff: cannot open 200: No such file

The error is caused by the following line in the loop that processes
the arguments:
-?*) cmp="$cmp '$1'";; (line 63 in version  1.6)

There should be an additional check to catch options with arguments. I
couldn't come up with a working solution quickly so I am currently
using a workaround.
If I remove the space between the option "-W" and it's COLUMNS
argument the script works as expected.

With this workaround the zdiff utility is great solution for the
problem I'm working on, thanks!

Thanks in advance

Bram Mertens

[Message part 3 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Bram Mertens <mertensb.mazda <at> gmail.com>
Cc: 35209-done <at> debbugs.gnu.org
Subject: Re: bug#35209: Bug in zdiff argument of an option separated by a
 space is not handled correctly
Date: Tue, 29 Mar 2022 16:53:58 -0700

On 4/9/19 07:11, Bram Mertens wrote:

> The zdiff script does not handle options with arguments separated by a
> space correctly.

Thanks for reporting that. Lv Ying eventually followed up here:

https://bugs.gnu.org/54291

and as mentioned there, a patch has been installed and should be in the 
next gzip release.

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