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Re: variable-length strings

From Uno <Uno@example.invalid>
Newsgroups comp.unix.shell
Subject Re: variable-length strings
Date 2011-06-03 22:58 -0600
Message-ID <94tsbkFe3nU1@mid.individual.net> (permalink)
References <94mfhcFngqU1@mid.individual.net> <slrniuf4u1.dhq.hjp-usenet2@hrunkner.hjp.at>

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On 06/02/2011 07:44 AM, Peter J. Holzer wrote:
> ["Followup-To:" header set to comp.unix.shell.]
> On 2011-06-01 09:36, Uno<Uno@example.invalid>  wrote:
>> q2) [I imagine that I have a distinct question for each listed ng]  In
>> testing, I've noticed a difference in file sizes between what I upload
>> with ftp and what I download.  The files are 60 megs, conceived by
>> apple, and I can't show what I'm saying until I get ftp working.
>>
>> There's no way I can look at these files with a hex editor and my eyes.
>>    Doesn't unix have a built-in way to compare them?
>
> There's cmp, but it only shows you where the first difference is.
>
> There's diff, but it is intended for text files.
>
> You could convert both files with od or hd and diff those. But that
> doesn't work well.
>
> I think Emacs has a binary-diff mode, but I'm from the vi fraction.
>
> So, back in the mid 1990's I wrote bdiff (binary diff):
> http://www.hjp.at/programs/bdiff/
>
> I guess I should dust it off, write a man-page and try to get it added
> to some linux distribution. But I very rarely need it myself.
>
> 	hp
>

Thx, peter, I want to get that running, but I'm mired in the type of the 
thing that a guy gets stuck in, when it's still his first year of a 
stable *nix dual-booting system.

My current difficulty is typical for me in that I start trying to 
wrangle something with perl, and pretty soon it shifts into a problem 
with figuring out more unix.

So I downloaded your software, extracted it on a thumbdrive, compiled
it, told ubuntu to run it, and it told me I don't have permission.

$ sudo chmod 777 bdiff
$ ls -l

-rw-r--r-- 1 dan dan    12414 2011-06-02 16:29 bdiff

That was my last try with that executable.  So I tried it again.

$ pwd
/media/KINGSTON/bdiff-1.0
$ cc -Wall -Wextra bdiff.c -o bdiff2
bdiff.c: In function ‘readfile’:
bdiff.c:98: warning: comparison between signed and unsigned integer 
expressions
bdiff.c: In function ‘findmatch’:
bdiff.c:227: warning: comparison between signed and unsigned integer 
expressions
bdiff.c:233: warning: comparison between signed and unsigned integer 
expressions
bdiff.c: In function ‘main’:
bdiff.c:296: warning: comparison between signed and unsigned integer 
expressions
bdiff.c:342: warning: comparison between signed and unsigned integer 
expressions
bdiff.c:350: warning: comparison between signed and unsigned integer 
expressions
$ ./bdiff2
bash: ./bdiff2: Permission denied
$ ls -l
total 123472
-rw-r--r-- 1 dan dan 37155580 2011-05-30 16:54 after2.avi
-rw-r--r-- 1 dan dan 37155580 2011-05-30 16:13 after3.avi
-rw-r--r-- 1 dan dan  4892982 2011-06-01 18:13 after.avi
-rw-r--r-- 1 dan dan     5289 1998-12-12 12:04 ascfile-1
-rw-r--r-- 1 dan dan     5428 1998-12-12 12:04 ascfile-2
-rw-r--r-- 1 dan dan    12414 2011-06-02 16:29 bdiff
-rw-r--r-- 1 dan dan    34907 2011-06-02 16:21 bdiff-1.0.tar.gz
-rw-r--r-- 1 dan dan    12414 2011-06-03 22:45 bdiff2
-rw-r--r-- 1 dan dan    10267 2011-06-03 22:45 bdiff.c
-rw-r--r-- 1 dan dan  4892982 2011-06-01 17:13 before.avi
-rw-r--r-- 1 dan dan    38623 1998-12-12 12:05 binfile-1
-rw-r--r-- 1 dan dan    39037 1998-12-12 12:05 binfile-2
-rw-r--r-- 1 dan dan      148 1998-12-12 12:05 dotest
-rw-r--r-- 1 dan dan 37155580 2011-05-30 17:54 
hydrogenalternativefromfossils.avi
-rw-r--r-- 1 dan dan  4893068 2011-03-29 16:17 jac1.avi
-rw-r--r-- 1 dan dan      136 1998-12-12 12:04 Makefile
$ chmod 777 bdiff2
$ ./bdiff2
bash: ./bdiff2: Permission denied
$ ls -l
total 123472
-rw-r--r-- 1 dan dan 37155580 2011-05-30 16:54 after2.avi
-rw-r--r-- 1 dan dan 37155580 2011-05-30 16:13 after3.avi
-rw-r--r-- 1 dan dan  4892982 2011-06-01 18:13 after.avi
-rw-r--r-- 1 dan dan     5289 1998-12-12 12:04 ascfile-1
-rw-r--r-- 1 dan dan     5428 1998-12-12 12:04 ascfile-2
-rw-r--r-- 1 dan dan    12414 2011-06-02 16:29 bdiff
-rw-r--r-- 1 dan dan    34907 2011-06-02 16:21 bdiff-1.0.tar.gz
-rw-r--r-- 1 dan dan    12414 2011-06-03 22:45 bdiff2
-rw-r--r-- 1 dan dan    10267 2011-06-03 22:45 bdiff.c
-rw-r--r-- 1 dan dan  4892982 2011-06-01 17:13 before.avi
-rw-r--r-- 1 dan dan    38623 1998-12-12 12:05 binfile-1
-rw-r--r-- 1 dan dan    39037 1998-12-12 12:05 binfile-2
-rw-r--r-- 1 dan dan      148 1998-12-12 12:05 dotest
-rw-r--r-- 1 dan dan 37155580 2011-05-30 17:54 
hydrogenalternativefromfossils.avi
-rw-r--r-- 1 dan dan  4893068 2011-03-29 16:17 jac1.avi
-rw-r--r-- 1 dan dan      136 1998-12-12 12:04 Makefile
$

What am I missing?

Shit's on fire down here in the US SW.  Arizona has a 400,000 acre fire 
that is 0% contained.  I just wish they would keep all their Arizonaness 
to themselves.  The smoke hurts my eyes.  Tja.
-- 
Uno

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Thread

variable-length strings Uno <Uno@example.invalid> - 2011-06-01 03:36 -0600
  Re: variable-length strings ccc31807 <cartercc@gmail.com> - 2011-06-01 07:13 -0700
    Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-02 10:54 -0600
  Re: variable-length strings "George Mpouras" <nospam.gravitalsun@hotmail.com.nospam> - 2011-06-01 17:01 +0300
  Re: variable-length strings "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-02 15:33 +0200
  Re: variable-length strings "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-02 15:44 +0200
    Re: variable-length strings Willem <willem@toad.stack.nl> - 2011-06-02 14:19 +0000
      cmp (was: variable-length strings) "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-02 18:15 +0200
      Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-03 23:21 -0600
        Re: variable-length strings "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2011-06-04 02:43 -0400
    Re: variable-length strings bonomi@host122.r-bonomi.com (Robert Bonomi) - 2011-06-03 11:08 -0500
      Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-04 00:03 -0600
        Re: variable-length strings pacman@kosh.dhis.org (Alan Curry) - 2011-06-04 20:18 +0000
          Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-07 23:00 -0600
      cmp (was: variable-length strings) "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-04 10:29 +0200
        Re: cmp Uno <Uno@example.invalid> - 2011-06-07 22:38 -0600
          Re: cmp pacman@kosh.dhis.org (Alan Curry) - 2011-06-08 05:22 +0000
            Re: cmp Uno <Uno@example.invalid> - 2011-06-09 16:10 -0600
    Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-03 22:58 -0600
      bdiff (was: variable-length strings) "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-04 10:52 +0200
        Re: bdiff Uno <Uno@example.invalid> - 2011-06-08 21:59 -0600
          Re: bdiff Ian Collins <ian-news@hotmail.com> - 2011-06-09 16:08 +1200
            Re: bdiff Uno <Uno@example.invalid> - 2011-06-08 22:20 -0600
              Re: bdiff Uno <Uno@example.invalid> - 2011-06-09 02:57 -0600
                Re: bdiff Janis Papanagnou <janis_papanagnou@hotmail.com> - 2011-06-09 11:10 +0200
                Re: bdiff bonomi@host122.r-bonomi.com (Robert Bonomi) - 2011-06-19 06:10 -0500
          Re: bdiff Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-09 07:13 -0400
            Re: bdiff Uno <Uno@example.invalid> - 2011-06-09 13:30 -0600
    Re: variable-length strings Uno <Uno@example.invalid> - 2011-06-03 23:11 -0600
      Re: variable-length strings "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2011-06-04 10:55 +0200

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