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Date: Sun, 17 Feb 2008 14:19:06 -0800
From: Lester Ingber <ingber AT ingber DOT com>
To: cygwin AT cygwin DOT com, jloup AT gzip DOT org
Subject: zdiff 1.3.12 still not correct
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On Cygwin
/bin/zdiff 1.3.12 still is not correct.  Line 107 reads
                               eval "$cmp" /dev/fd/5 -) 5<&0

whereas it probably should read something like
                               eval "$cmp" /dev/fd/5 - >&3) 5<&0

I looked at source zdiff.in in gzip-1.312 and on line 107 it has
                               eval "$cmp" /dev/fd/5 -) 5<&0

I use my own /usr/local/bin/zdiff with line 107 having
                               eval "$cmp" /dev/fd/5 - >&3) 5<&0

For example, I created zdiff_mod.in from zdiff.in the gzip-1.3.12 source:
14:05:01 @lester:~% diff zdiff.in zdiff_mod.in
107c107
<                              eval "$cmp" /dev/fd/5 -) 5<&0
---
>                              eval "$cmp" /dev/fd/5 - >$3) 5<&0
14:05:47 @lester:~% gzip zdiff.in zdiff_mod.in
14:06:10 @lester:~% /bin/zdiff zdiff.in.gz zdiff_mod.in.gz
14:06:28 @lester:~% /usr/local/bin/zdiff zdiff.in.gz zdiff_mod.in.gz
107c107
<                              eval "$cmp" /dev/fd/5 -) 5<&0
---
>                              eval "$cmp" /dev/fd/5 - >$3) 5<&0
14:06:39 @lester:~% diff zdiff.in.gz zdiff_mod.in.gz
Files zdiff.in.gz and zdiff_mod.in.gz differ

In other words, /bin/zdiff does not report any difference between
zdiff.in and zdiff_mod.in.

I would be surprised if this already has not lead to some bad results
for some users who use these utilities daily to check their codes.

Thanks for your attention to this matter

Lester


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