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Groups > comp.lang.c > #10264

Re: Teaching C (was Re: hexump.c)

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Teaching C (was Re: hexump.c)
Date 2011-09-14 19:29 -0700
Organization None to speak of
Message-ID <ln8vpqa67f.fsf@nuthaus.mib.org> (permalink)
References <j4ducg$lmn$1@speranza.aioe.org> <lnpqj2amz7.fsf@nuthaus.mib.org> <j4r4in$pv2$1@speranza.aioe.org> <4E711A9D.2030501@verizon.net> <j4rlmm$cv6$1@speranza.aioe.org>

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pacman@kosh.dhis.org (Alan Curry) writes:
[...]
> Here's a larger survey. Most of the versions are from the current Debian
> release. The ratio got a little better as I added more, but crashing is still
> a very popular option.
>
> Behaves normally:
>   7zr (9.04~dfsg.1-1)
>   ar (binutils 2.20.1) [prints help as expected but program name is "(null)"]
>   as (binutils 2.20.1)
>   bash (4.1.5(1)-release) [$0 expands to "bash"]
>   dash (0.5.5.1-7.4) [$0 expands to ""]
>   false (coreutils 8.5)
>   gpg (1.4.10)
>   groff (1.20.1)
>   pdksh (5.2.14-25) [$0 expands to "pdksh"]
>   sed (4.2.1) [prints help as expected but program name is "(null)"]
>   svn (1.6.12)
>   true (coreutils 8.5)
>   vim (7.2)
>   w3m (0.5.2)
>   xterm (261)
[snip]

The ones that print the program name as "(null)" are probably passing a
null pointer to printf or fprintf.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 22:53 +0200
  Re: hexump.c tea strainer <nospam@nospam.com> - 2011-09-09 21:06 +0000
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 23:57 +0200
    Re: hexump.c NicStevens <nic.stevens@gmail.com> - 2011-09-12 13:22 -0700
  Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-10 09:18 +1200
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 23:59 +0200
  Re: hexump.c Ike Naar <ike@iceland.freeshell.org> - 2011-09-09 22:29 +0000
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 00:39 +0200
      Re: hexump.c Ike Naar <ike@iceland.freeshell.org> - 2011-09-09 22:53 +0000
        Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 00:58 +0200
        Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-13 06:44 +0000
          Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-13 10:33 +0200
            Re: hexump.c Fritz Wuehler <fritz@spamexpire-201109.rodent.frell.theremailer.net> - 2011-09-13 18:02 +0200
            Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-13 16:36 -0400
              Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-13 22:44 +0200
                Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 13:31 +0100
                Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 15:27 +0200
                Re: Teaching C (was Re: hexump.c) Richard Damon <news.x.richarddamon@xoxy.net> - 2011-09-14 11:49 -0400
                Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 13:27 -0700
                Re: Teaching C (was Re: hexump.c) pacman@kosh.dhis.org (Alan Curry) - 2011-09-14 20:59 +0000
                Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 22:20 +0100
                Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-14 17:20 -0400
                Re: Teaching C (was Re: hexump.c) pacman@kosh.dhis.org (Alan Curry) - 2011-09-15 01:51 +0000
                Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 19:29 -0700
                Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 19:21 -0700
                Re: Teaching C Ben Pfaff <blp@cs.stanford.edu> - 2011-09-14 19:58 -0700
                Re: Teaching C Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-09-14 21:55 -0600
                Re: Teaching C James Kuyper <jameskuyper@verizon.net> - 2011-09-15 06:54 -0400
                Re: Teaching C Keith Thompson <kst-u@mib.org> - 2011-09-15 11:58 -0700
                Re: Teaching C Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 12:57 -0800
                Re: Teaching C Nobody <nobody@nowhere.com> - 2011-09-15 14:25 +0100
                Re: Teaching C Seebs <usenet-nospam@seebs.net> - 2011-09-16 22:00 +0000
                Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-14 12:54 -0400
                Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-14 13:26 -0400
                Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 19:33 +0200
                Re: Teaching C (was Re: hexump.c) jameskuyper <jameskuyper@verizon.net> - 2011-09-14 11:33 -0700
                Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 21:17 +0200
                Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-16 11:47 -0400
                Re: Teaching C (was Re: hexump.c) Seebs <usenet-nospam@seebs.net> - 2011-09-14 20:43 +0000
                Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 22:35 +0100
                Re: Teaching C (was Re: hexump.c) gordonb.8a7i1@burditt.org (Gordon Burditt) - 2011-09-14 17:31 -0500
                Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 19:32 +0200
                Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-16 11:27 -0400
                Re: Teaching C (was Re: hexump.c) Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-16 08:49 -0700
                Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-17 15:04 -0400
            Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-13 20:31 -0700
              Re: hexump.c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-14 03:22 -0700
              Re: hexump.c "BartC" <bc@freeuk.com> - 2011-09-14 11:40 +0100
                Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 13:54 +0200
                Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-14 13:50 +0100
                Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 11:35 -0700
                Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-14 19:12 +0000
                Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-14 15:31 -0700
                Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-15 00:59 +0200
                Re: hexump.c Kleuskes & Moos <kleuske@somewhere.else.net> - 2011-09-14 23:14 +0000
                Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-15 08:52 -0700
                Re: hexump.c Jens Gustedt <jens.gustedt@loria.fr> - 2011-09-14 21:22 +0200
                Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 21:26 +0200
                Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-15 07:32 +1200
                Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 21:44 +0200
                Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 13:49 -0700
                Re: hexump.c Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-16 00:50 +0300
                Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-15 18:34 -0700
                Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 12:16 -0700
                Hypocrites jacob navia <jacob@spamsink.net> - 2011-09-14 21:40 +0200
                Re: Hypocrites Keith Thompson <kst-u@mib.org> - 2011-09-14 19:11 -0700
                Re: hexump.c Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-14 15:05 +0100
                Re: hexump.c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-14 07:56 -0700
                Re: hexump.c "BartC" <bc@freeuk.com> - 2011-09-14 17:23 +0100
              Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-14 19:12 +0000
              Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-14 15:24 -0700
      Re: hexump.c gordonb.ik17p@burditt.org (Gordon Burditt) - 2011-09-09 18:16 -0500
        Re: hexump.c Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-12 22:24 +0000
  Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-09 20:33 -0400
    Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-10 12:42 +1200
      Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-10 17:16 -0400
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 10:03 +0200
  Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-10 10:04 +0100
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 11:41 +0200
      Re: hexump.c pete <pfiland@mindspring.com> - 2011-09-10 05:51 -0400
        Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 12:38 +0200
          Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-10 17:53 +0100
  Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 12:46 +0200
    Re: hexump.c Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-10 13:03 +0100
      Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 15:34 +0200
    Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-10 17:37 -0400
      Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-11 00:10 +0200
        Re: hexump.c Patrick Scheible <kkt@zipcon.net> - 2011-09-10 21:03 -0700
  Re: hexump.c Barry Schwarz <schwarz45@yahoo.com> - 2011-09-11 00:37 -0700
    Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-11 13:56 +0200

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