[bug-diffutils] Incorrect output from cmp

[Tucker Berckmann]

Hello,

I am getting some strange output from cmp on two files. The index is off by one for the first and last difference, and both the index and values are wrong for the second difference. I tried two versions of cmp (listed below), and I got the same output in both cases. My system info is also displayed below.

Regards,

Tucker Berckmann | Firmware Engineer | SanDisk | t. +1.408.801.2940 | address@hidden | www.SanDisk.com

$ cmp -l file1 file2

 10   2   4

 64  16  13

200   4   2

$ cmp -l file1 file2 | awk '{printf("%x %x %x\n",$1,$2,$3)}'

a 2 4

40 10 d

c8 4 2

$ hexdump file1

0000000 0c 00 00 00 00 00 00 00 01 02 00 07 0a 00 0b 0a

0000010 1f 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0000020 00 00 00 00 00 00 00 00 00 10 00 00 00 08 00 00

0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0e

0000040 00 10 08 08 04 03 20 04 40 00 40 00 00 00 14 00

0000050 02 01 00 03 05 08 00 00 00 00 ff ff ff ff 01 03

0000060 02 07 ff ff ff ff 01 00 00 00 00 03 02 00 ff ff

0000070 ff ff 01 00 00 00 00 03 02 00 ff ff ff ff 01 00

0000080 00 00 00 03 02 00 ff ff ff ff 01 00 00 00 00 03

0000090 02 00 ff ff ff ff 01 00 00 00 00 03 02 00 ff ff

00000a0 ff ff 01 00 00 00 00 03 02 00 00 00 00 00 00 00

00000b0 00 00 00 00 00 00 01 00 1e 00 00 00 04 00 00 00

00000c0 03 07 00 00 00 00 00 04 00 00 00 00 00 00 00 00

00000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

*

0000200

$ hexdump file2

0000000 0c 00 00 00 00 00 00 00 01 04 00 07 0a 00 0b 0a

0000010 1f 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0000020 00 00 00 00 00 00 00 00 00 10 00 00 00 08 00 00

0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0b

0000040 00 10 08 08 04 03 20 04 40 00 40 00 00 00 14 00

0000050 02 01 00 03 05 08 00 00 00 00 ff ff ff ff 01 03

0000060 02 07 ff ff ff ff 01 00 00 00 00 03 02 00 ff ff

0000070 ff ff 01 00 00 00 00 03 02 00 ff ff ff ff 01 00

0000080 00 00 00 03 02 00 ff ff ff ff 01 00 00 00 00 03

0000090 02 00 ff ff ff ff 01 00 00 00 00 03 02 00 ff ff

00000a0 ff ff 01 00 00 00 00 03 02 00 00 00 00 00 00 00

00000b0 00 00 00 00 00 00 01 00 1e 00 00 00 04 00 00 00

00000c0 03 07 00 00 00 00 00 02 00 00 00 00 00 00 00 00

00000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

*

0000200

$ cmp --version

cmp (GNU diffutils) 2.8.1

Copyright (C) 2002 Free Software Foundation, Inc.

This program comes with NO WARRANTY, to the extent permitted by law.

You may redistribute copies of this program

under the terms of the GNU General Public License.

For more information about these matters, see the file named COPYING.

Written by Torbjorn Granlund and David MacKenzie.

$ /opt/local/libexec/gnubin/cmp --version

cmp (GNU diffutils) 3.2

Copyright (C) 2011 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

Written by Torbjörn Granlund and David MacKenzie.

$ uname -a

Darwin <hostname> 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386

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