From: Hyman Rosen <hyrosen@mail.com>
Subject: Re: How do I write directly to a memory address?
Date: Fri, 04 Feb 2011 11:00:18 -0500
Date: 2011-02-04T11:00:18-05:00 [thread overview]
Message-ID: <4d4c232a$0$28967$882e7ee2@usenet-news.net> (raw)
In-Reply-To: <05a3673e-fb97-449c-94ed-1139eb085c32@x1g2000yqb.googlegroups.com>
On 2/4/2011 4:24 AM, Ludovic Brenta wrote:
> Did I mention that *every* time I look at C code I see a bug?
> Sometimes, looking twice at the same code reveals two bugs! Here you
> do not check that message != NULL; the condition should be:
> while (message&& *message != 0)
Did I mention that people who criticize C are like people
who criticize grammar? Every time they do so, their own
criticism contains errors.
You make two errors here. The first is to assume without
any actual knowledge that it is possible for the argument
to be a null pointer; it is likely that the contract for
this procedure requires that it not be. The second is that
you test for the pointer being null each time through the
loop rather than just once.
next prev parent reply other threads:[~2011-02-04 16:00 UTC|newest]
Thread overview: 381+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 5:52 How do I write directly to a memory address? Syntax Issues
2011-02-03 8:00 ` Georg Bauhaus
2011-02-03 8:01 ` Georg Bauhaus
2011-02-08 13:34 ` Yannick Duchêne (Hibou57)
2011-02-03 8:08 ` mockturtle
2011-02-03 18:07 ` Jeffrey Carter
2011-02-08 13:43 ` Yannick Duchêne (Hibou57)
2011-02-08 21:07 ` Vinzent Hoefler
2011-02-10 2:21 ` Randy Brukardt
2011-02-03 8:24 ` Ludovic Brenta
2011-02-03 10:50 ` Syntax Issues
2011-02-03 11:03 ` Georg Bauhaus
2011-02-03 18:24 ` Jeffrey Carter
2011-02-04 9:21 ` Ludovic Brenta
2011-02-03 21:30 ` Florian Weimer
2011-02-04 9:24 ` Ludovic Brenta
2011-02-04 10:31 ` Georg Bauhaus
2011-02-04 11:07 ` Dmitry A. Kazakov
2011-02-04 17:35 ` Jeffrey Carter
2011-02-04 16:00 ` Hyman Rosen [this message]
2011-02-04 17:40 ` Dmitry A. Kazakov
2011-02-04 18:35 ` Hyman Rosen
2011-02-05 5:17 ` Randy Brukardt
2011-02-04 21:36 ` Shark8
2011-02-04 23:00 ` Adam Beneschan
2011-02-05 0:20 ` John B. Matthews
2011-02-05 14:56 ` Pascal Obry
2011-02-07 14:59 ` Hyman Rosen
2011-02-07 16:24 ` Robert A Duff
2011-02-07 16:44 ` Hyman Rosen
2011-02-07 17:02 ` Ludovic Brenta
2011-03-01 20:27 ` Hyman Rosen
2011-03-01 20:47 ` Dmitry A. Kazakov
2011-03-01 21:17 ` Hyman Rosen
2011-03-01 21:37 ` Dmitry A. Kazakov
2011-03-01 21:54 ` Hyman Rosen
2011-03-02 8:42 ` Dmitry A. Kazakov
2011-03-02 14:36 ` Hyman Rosen
2011-03-02 15:30 ` Dmitry A. Kazakov
2011-03-02 15:40 ` Hyman Rosen
2011-03-02 16:25 ` Georg Bauhaus
2011-03-02 16:40 ` Hyman Rosen
2011-03-02 18:44 ` Georg Bauhaus
2011-03-02 18:59 ` Hyman Rosen
2011-03-02 17:21 ` Dmitry A. Kazakov
2011-03-02 17:40 ` Hyman Rosen
2011-03-02 18:04 ` Dmitry A. Kazakov
2011-03-02 18:29 ` Hyman Rosen
2011-03-02 21:55 ` Dmitry A. Kazakov
2011-03-02 22:10 ` Hyman Rosen
2011-03-03 8:14 ` Dmitry A. Kazakov
2011-03-03 8:04 ` Simon Wright
2011-03-03 8:23 ` Dmitry A. Kazakov
2011-03-03 8:50 ` Hyman Rosen
2011-03-03 7:54 ` Simon Wright
2011-03-02 20:34 ` KK6GM
2011-03-02 20:59 ` Hyman Rosen
2011-03-02 21:03 ` Vinzent Hoefler
2011-03-02 21:13 ` Hyman Rosen
2011-03-02 21:34 ` KK6GM
2011-03-03 1:09 ` Hyman Rosen
2011-03-03 1:38 ` KK6GM
2011-03-03 2:42 ` Randy Brukardt
2011-03-02 23:18 ` Vinzent Hoefler
2011-03-02 23:26 ` Hyman Rosen
2011-03-03 0:46 ` Edward Fish
2011-03-03 1:03 ` Hyman Rosen
2011-03-03 3:01 ` Randy Brukardt
2011-03-03 6:05 ` Hyman Rosen
2011-03-03 8:52 ` Dmitry A. Kazakov
2011-03-03 17:51 ` Hyman Rosen
2011-03-03 18:32 ` Dmitry A. Kazakov
2011-03-03 20:08 ` Hyman Rosen
2011-03-03 21:55 ` Dmitry A. Kazakov
2011-03-03 22:08 ` Hyman Rosen
2011-03-03 20:34 ` Hyman Rosen
2011-03-04 0:22 ` Randy Brukardt
2011-03-04 3:21 ` Nasser M. Abbasi
2011-03-04 16:48 ` Hyman Rosen
2011-03-03 21:24 ` Vinzent Hoefler
2011-03-03 21:32 ` Hyman Rosen
2011-03-03 21:39 ` Vinzent Hoefler
2011-03-03 21:44 ` Hyman Rosen
2011-03-03 22:28 ` Georg Bauhaus
2011-03-01 21:52 ` Pascal Obry
2011-03-01 22:08 ` Hyman Rosen
2011-03-02 0:41 ` Randy Brukardt
2011-03-02 2:59 ` Nasser M. Abbasi
2011-03-03 1:44 ` Randy Brukardt
2011-03-02 14:26 ` Hyman Rosen
2011-03-02 14:34 ` Ludovic Brenta
2011-03-02 14:59 ` Hyman Rosen
2011-03-02 15:19 ` Pascal Obry
2011-03-02 15:35 ` Hyman Rosen
2011-03-02 15:49 ` Ludovic Brenta
2011-03-02 16:03 ` Hyman Rosen
2011-03-03 2:23 ` Randy Brukardt
2011-03-03 5:48 ` Hyman Rosen
2011-03-02 9:19 ` Pascal Obry
2011-03-02 9:31 ` Dmitry A. Kazakov
2011-03-02 9:45 ` Nasser M. Abbasi
2011-03-02 10:24 ` Georg Bauhaus
2011-03-02 11:16 ` Dmitry A. Kazakov
2011-03-02 14:51 ` Hyman Rosen
2011-02-06 17:49 ` Simon Clubley
2011-02-06 18:18 ` Niklas Holsti
2011-02-06 19:05 ` Simon Clubley
2011-02-06 20:01 ` Dmitry A. Kazakov
2011-02-06 21:27 ` Maciej Sobczak
2011-02-06 23:08 ` Shark8
2011-02-07 6:38 ` Niklas Holsti
2011-02-07 7:23 ` Shark8
2011-02-07 8:31 ` Niklas Holsti
2011-02-07 12:31 ` Simon Clubley
2011-02-07 12:42 ` Simon Clubley
2011-02-07 21:54 ` Randy Brukardt
2011-02-08 0:21 ` Bill Findlay
2011-02-08 1:06 ` Adam Beneschan
2011-02-21 7:17 ` David Thompson
2011-02-08 12:46 ` Simon Clubley
2011-02-08 13:12 ` J-P. Rosen
2011-02-08 18:03 ` Jeffrey Carter
2011-02-07 8:38 ` Dmitry A. Kazakov
2011-02-07 9:05 ` Maciej Sobczak
2011-02-07 9:24 ` Dmitry A. Kazakov
2011-02-07 23:11 ` Maciej Sobczak
2011-02-08 18:14 ` Dmitry A. Kazakov
2011-02-08 21:48 ` Maciej Sobczak
2011-02-09 8:43 ` Dmitry A. Kazakov
2011-02-09 21:07 ` Maciej Sobczak
2011-02-09 21:38 ` Dmitry A. Kazakov
2011-03-01 21:45 ` Maciej Sobczak
2011-02-07 9:00 ` Ludovic Brenta
2011-02-07 13:43 ` Georg Bauhaus
2011-02-07 13:56 ` Ludovic Brenta
2011-02-07 14:58 ` Georg Bauhaus
2011-02-07 15:21 ` Dmitry A. Kazakov
2011-02-07 16:14 ` Robert A Duff
2011-02-07 17:23 ` Dmitry A. Kazakov
2011-02-07 18:38 ` Jeffrey Carter
2011-02-07 21:38 ` Robert A Duff
2011-02-07 22:41 ` Simon Wright
2011-02-07 18:10 ` Georg Bauhaus
2011-02-07 19:27 ` Simon Wright
2011-02-07 19:29 ` Dmitry A. Kazakov
2011-02-07 16:54 ` Ludovic Brenta
2011-02-07 17:55 ` Georg Bauhaus
2011-02-08 8:04 ` Ludovic Brenta
2011-02-08 9:01 ` Nasser M. Abbasi
2011-02-08 9:08 ` Ludovic Brenta
2011-02-08 9:43 ` Georg Bauhaus
2011-02-08 19:53 ` Shark8
2011-02-08 9:46 ` Georg Bauhaus
2011-02-08 9:58 ` Ludovic Brenta
2011-02-08 10:03 ` Georg Bauhaus
2011-02-08 10:08 ` Ludovic Brenta
2011-02-08 10:27 ` Georg Bauhaus
2011-02-08 10:15 ` Nasser M. Abbasi
2011-02-08 16:48 ` Adam Beneschan
2011-02-08 18:25 ` Georg Bauhaus
2011-02-08 20:48 ` Vinzent Hoefler
2011-02-08 21:24 ` Georg Bauhaus
2011-02-08 21:41 ` Vinzent Hoefler
2011-02-09 8:59 ` Dmitry A. Kazakov
2011-02-09 18:25 ` Vinzent Hoefler
2011-02-09 20:03 ` Dmitry A. Kazakov
2011-02-09 20:19 ` Vinzent Hoefler
2011-02-09 21:10 ` Hyman Rosen
2011-02-09 21:42 ` Vinzent Hoefler
2011-02-08 17:11 ` Pascal Obry
2011-02-08 17:11 ` Pascal Obry
2011-02-08 17:11 ` Pascal Obry
2011-02-08 17:24 ` Hyman Rosen
2011-02-08 18:27 ` Dmitry A. Kazakov
2011-02-08 18:43 ` Hyman Rosen
2011-02-08 10:10 ` Georg Bauhaus
2011-02-08 10:14 ` Ludovic Brenta
2011-02-08 10:31 ` Georg Bauhaus
2011-02-08 18:30 ` Jeffrey Carter
2011-02-08 18:47 ` Hyman Rosen
2011-02-08 20:11 ` Shark8
2011-02-08 20:27 ` Hyman Rosen
2011-02-08 20:52 ` Shark8
2011-02-08 21:21 ` Jeffrey Carter
2011-02-08 21:35 ` Shark8
2011-02-09 0:03 ` Randy Brukardt
2011-02-09 0:14 ` Shark8
2011-02-10 2:51 ` Randy Brukardt
2011-02-10 4:30 ` Shark8
2011-02-11 2:16 ` Randy Brukardt
2011-02-09 15:34 ` Hyman Rosen
2011-02-09 16:15 ` Dmitry A. Kazakov
2011-02-09 16:43 ` KK6GM
2011-02-09 17:49 ` Dmitry A. Kazakov
2011-02-09 17:54 ` Hyman Rosen
2011-02-09 18:15 ` Dmitry A. Kazakov
2011-02-09 18:25 ` Shark8
2011-02-09 20:16 ` Simon Wright
2011-02-09 20:33 ` Vinzent Hoefler
2011-02-09 16:48 ` Hyman Rosen
2011-02-09 17:49 ` Dmitry A. Kazakov
2011-02-09 18:07 ` Hyman Rosen
2011-02-09 18:36 ` Dmitry A. Kazakov
2011-02-09 19:12 ` Hyman Rosen
2011-02-09 19:41 ` Shark8
2011-02-09 20:00 ` Hyman Rosen
2011-02-09 20:25 ` Shark8
2011-02-09 21:20 ` Hyman Rosen
2011-02-09 21:23 ` Shark8
2011-02-09 21:40 ` Hyman Rosen
2011-02-09 23:59 ` Robert A Duff
2011-02-09 20:01 ` Dmitry A. Kazakov
2011-02-09 20:56 ` Hyman Rosen
2011-02-09 21:47 ` Dmitry A. Kazakov
2011-02-09 21:51 ` Simon Wright
2011-02-09 21:56 ` Hyman Rosen
2011-02-09 22:01 ` Dmitry A. Kazakov
2011-02-10 3:08 ` Randy Brukardt
2011-02-09 22:31 ` Anonymous
2011-02-09 22:34 ` Hyman Rosen
2011-02-09 22:41 ` Vinzent Hoefler
2011-02-09 22:52 ` Hyman Rosen
[not found] ` <4d52d7d9$0$18057$882e7ee2@usenet-news.ne t>
2011-02-10 3:03 ` Randy Brukardt
2011-02-09 18:23 ` Shark8
2011-02-09 18:31 ` Hyman Rosen
2011-02-09 19:20 ` Shark8
2011-02-09 19:43 ` Hyman Rosen
2011-02-09 20:29 ` Shark8
2011-02-09 21:26 ` Hyman Rosen
2011-02-09 21:40 ` Shark8
2011-02-09 22:09 ` Hyman Rosen
2011-02-09 22:23 ` Shark8
2011-02-09 22:31 ` Hyman Rosen
2011-02-09 22:38 ` Vinzent Hoefler
2011-02-09 22:50 ` Hyman Rosen
2011-02-10 0:16 ` Shark8
2011-02-10 15:28 ` Hyman Rosen
2011-02-10 16:38 ` Shark8
2011-02-10 16:46 ` Hyman Rosen
2011-02-10 3:23 ` Randy Brukardt
2011-02-10 17:33 ` Vinzent Hoefler
2011-02-09 23:07 ` Shark8
2011-02-09 23:24 ` Hyman Rosen
2011-02-10 0:35 ` Shark8
2011-02-10 15:38 ` Hyman Rosen
2011-02-10 17:05 ` Shark8
2011-02-10 17:40 ` Hyman Rosen
2011-02-10 18:22 ` Shark8
2011-02-10 19:20 ` Georg Bauhaus
2011-02-11 8:26 ` Ludovic Brenta
2011-02-11 10:22 ` Nasser M. Abbasi
2011-02-11 16:10 ` Hyman Rosen
2011-02-11 18:04 ` Dmitry A. Kazakov
2011-02-11 18:31 ` Hyman Rosen
2011-02-11 18:42 ` Vinzent Hoefler
2011-02-11 18:52 ` Hyman Rosen
2011-02-11 20:02 ` Vinzent Hoefler
2011-02-11 19:41 ` Dmitry A. Kazakov
2011-02-11 18:43 ` Vinzent Hoefler
2011-02-11 18:57 ` Hyman Rosen
2011-02-11 20:15 ` Vinzent Hoefler
2011-02-11 20:29 ` Hyman Rosen
2011-02-11 20:42 ` Vinzent Hoefler
2011-02-11 18:52 ` Georg Bauhaus
2011-02-11 19:02 ` Hyman Rosen
2011-02-10 17:30 ` Georg Bauhaus
2011-02-09 18:10 ` Shark8
2011-02-10 2:56 ` Randy Brukardt
2011-02-09 21:15 ` Anonymous
2011-02-08 19:43 ` Dmitry A. Kazakov
2011-02-08 20:01 ` Hyman Rosen
2011-02-08 20:27 ` Dmitry A. Kazakov
2011-02-08 20:41 ` Hyman Rosen
2011-02-08 21:06 ` Adam Beneschan
2011-02-08 21:13 ` Hyman Rosen
2011-02-08 21:16 ` Vinzent Hoefler
2011-02-08 22:41 ` Adam Beneschan
2011-02-09 18:39 ` Vinzent Hoefler
2011-02-09 20:29 ` Simon Wright
2011-02-09 20:44 ` Vinzent Hoefler
2011-02-10 3:03 ` Adam Beneschan
2011-02-10 19:07 ` Vinzent Hoefler
2011-02-11 7:19 ` Stephen Leake
2011-02-11 18:43 ` Vinzent Hoefler
2011-02-09 10:42 ` Simon Wright
2011-02-09 18:39 ` Vinzent Hoefler
2011-02-09 18:48 ` J-P. Rosen
2011-02-09 18:55 ` Vinzent Hoefler
2011-02-09 22:03 ` J-P. Rosen
2011-02-09 22:25 ` Vinzent Hoefler
2011-02-10 3:07 ` Adam Beneschan
2011-02-10 6:09 ` J-P. Rosen
2011-02-10 17:48 ` Vinzent Hoefler
2011-02-09 21:30 ` Simon Wright
2011-02-09 22:05 ` Vinzent Hoefler
2011-02-09 18:42 ` Vinzent Hoefler
2011-02-08 21:09 ` Shark8
2011-02-08 21:25 ` Hyman Rosen
2011-02-08 21:46 ` Vinzent Hoefler
2011-02-08 21:59 ` Hyman Rosen
2011-02-09 18:44 ` Vinzent Hoefler
2011-02-09 18:54 ` Hyman Rosen
2011-02-09 18:59 ` Vinzent Hoefler
2011-02-09 19:21 ` Hyman Rosen
2011-02-09 19:30 ` Vinzent Hoefler
2011-02-09 19:44 ` Hyman Rosen
2011-02-09 20:08 ` Vinzent Hoefler
2011-02-08 21:49 ` Simon Clubley
2011-02-08 21:51 ` Vinzent Hoefler
2011-02-08 22:13 ` Hyman Rosen
2011-02-09 18:04 ` Vinzent Hoefler
2011-02-08 22:12 ` Hyman Rosen
2011-02-08 23:03 ` Simon Clubley
2011-02-08 22:30 ` Shark8
2011-02-09 10:19 ` Ludovic Brenta
2011-02-09 15:09 ` KK6GM
2011-02-09 0:13 ` Randy Brukardt
2011-02-09 1:56 ` Shark8
2011-02-09 2:33 ` Adam Beneschan
2011-02-09 15:49 ` Hyman Rosen
2011-02-10 3:29 ` Randy Brukardt
2011-02-21 7:17 ` David Thompson
2011-02-08 20:04 ` Simon Clubley
2011-02-08 20:44 ` Dmitry A. Kazakov
2011-02-08 21:19 ` Simon Clubley
2011-02-09 9:21 ` Dmitry A. Kazakov
2011-02-09 15:20 ` KK6GM
2011-02-09 16:39 ` Hyman Rosen
2011-02-09 16:46 ` KK6GM
2011-02-09 17:15 ` Hyman Rosen
2011-02-09 17:46 ` Shark8
2011-02-09 18:02 ` Dmitry A. Kazakov
2011-02-09 18:17 ` Hyman Rosen
2011-02-09 18:34 ` Dmitry A. Kazakov
2011-02-09 18:52 ` Hyman Rosen
2011-02-09 19:48 ` Dmitry A. Kazakov
2011-02-09 20:09 ` Vinzent Hoefler
2011-02-09 20:52 ` Hyman Rosen
2011-02-09 21:45 ` Simon Wright
2011-02-09 22:13 ` Shark8
2011-02-09 18:53 ` KK6GM
2011-02-09 19:20 ` Hyman Rosen
2011-02-08 21:31 ` Shark8
2011-02-08 21:50 ` Vinzent Hoefler
2011-02-08 21:56 ` Simon Clubley
2011-02-08 22:41 ` Shark8
2011-02-09 18:12 ` Vinzent Hoefler
2011-02-09 18:29 ` Shark8
2011-02-09 18:49 ` Vinzent Hoefler
2011-02-09 18:36 ` Hyman Rosen
2011-02-09 18:51 ` Vinzent Hoefler
2011-02-21 7:17 ` David Thompson
2011-02-08 20:55 ` Georg Bauhaus
2011-02-08 21:26 ` Jeffrey Carter
2011-02-09 7:59 ` Mart van de Wege
2011-02-09 9:16 ` Dmitry A. Kazakov
2011-02-09 10:28 ` Mart van de Wege
2011-02-09 15:57 ` Hyman Rosen
2011-02-10 3:36 ` Randy Brukardt
2011-02-10 6:35 ` J-P. Rosen
2011-02-08 10:11 ` Georg Bauhaus
2011-02-08 10:16 ` Ludovic Brenta
2011-02-08 10:36 ` Georg Bauhaus
2011-02-08 10:43 ` Ludovic Brenta
2011-02-08 12:20 ` Georg Bauhaus
2011-02-08 20:21 ` Shark8
2011-02-08 21:46 ` Georg Bauhaus
2011-02-08 22:35 ` Shark8
2011-02-10 2:18 ` Randy Brukardt
2011-02-08 15:36 ` Hyman Rosen
2011-02-08 16:44 ` Adam Beneschan
2011-02-08 17:13 ` Hyman Rosen
2011-02-08 18:33 ` Georg Bauhaus
2011-02-08 18:39 ` Hyman Rosen
2011-02-03 17:43 ` John McCormick
2011-02-12 4:47 ` Edward Fish
2011-02-12 8:02 ` Niklas Holsti
2011-02-14 0:09 ` Hyman Rosen
2011-02-15 0:25 ` Randy Brukardt
2011-02-19 4:21 ` Edward Fish
2011-02-13 1:04 ` anon
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