From: Brian May <bam@snoopy.apana.org.au>
Subject: Re: Ada BIND was: Improving Ada's image - Was: 7E7 Flight Controls Electronics
Date: Tue, 15 Jun 2004 12:40:46 +1000
Date: 2004-06-15T12:40:46+10:00 [thread overview]
Message-ID: <sa4isdttufl.fsf@snoopy.apana.org.au> (raw)
In-Reply-To: mailman.108.1087258143.391.comp.lang.ada@ada-france.org
>>>>> "Alexander" == Alexander E Kopilovich <aek@VB1162.spb.edu> writes:
Alexander> Well, for C, that is for fread and fgets I would say
Alexander> that although these functions indeed have maximum
Alexander> amount of bytes to be read onto a buffer as a
Alexander> parameter, but:
Alexander> 1) this maximum, if not computed from "preliminary
Alexander> read", is usually set manually, it does not computed
Alexander> automatically from the length of the buffer used in
Alexander> that fread/fgets; therefore there is an obsvious
Alexander> possibility of programmer's mistake, which will not be
Alexander> noticed by compiler;
...not to mention older functions that don't support a string length
(eg. sprintf). Some have better versions (eg. snprintf or asprintf),
but such functions are often non-standard and non-portable extensions.
Alexander> 2) sometimes there is no reasonable estimate for
Alexander> *guaranteed* maximum of a string to be read, and
Alexander> therefore the length of the string can be greater than
Alexander> already allocated buffer; reading a string in chunks
Alexander> can be inconvenient for some reasons, and thus that
Alexander> double reading (first pass for determining the length
Alexander> of string, then allocating the buffer, and then second
Alexander> pass with filling the buffer).
Perhaps I am showing my ignorance, but do you read a string of
undefined length into an Ada program?
Isn't setting a maximum length of a string a good thing? eg. I don't
want my network daemon to try and allocate 1 gigabyte of memory just
because somebody sends it a line 1 gigabyte long, when the expected
maximum length was 80 bytes. This could be a security issue in itself
(Denial-of-service attack).
However, allocating lots of memory just in case the worst case
scenario occurs does sound wasteful to me, and perhaps this is what
you mean.
--
Brian May <bam@snoopy.apana.org.au>
next prev parent reply other threads:[~2004-06-15 2:40 UTC|newest]
Thread overview: 212+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-30 11:46 Improving Ada's image - Was: 7E7 Flight Controls Electronics Per Dalgas Jakobsen
2004-05-30 16:13 ` Pascal Obry
2004-05-30 18:03 ` Luke A. Guest
2004-05-30 19:09 ` Per Dalgas Jakobsen
2004-05-31 2:28 ` Richard Riehle
2004-05-31 15:33 ` Wes Groleau
2004-06-01 2:56 ` Hyman Rosen
2004-06-01 14:51 ` Wes Groleau
2004-06-07 16:29 ` Warren W. Gay VE3WWG
2004-06-07 17:44 ` Hyman Rosen
2004-06-08 16:09 ` Warren W. Gay VE3WWG
2004-06-08 17:30 ` Hyman Rosen
2004-06-08 20:38 ` Warren W. Gay VE3WWG
2004-06-08 22:23 ` Hyman Rosen
2004-06-09 2:27 ` Warren W. Gay VE3WWG
2004-06-09 4:41 ` I R T
2004-06-09 6:43 ` Richard Riehle
2004-06-10 6:53 ` Randy Brukardt
2004-06-12 3:16 ` Robert I. Eachus
2004-06-09 6:39 ` Hyman Rosen
2004-06-09 7:44 ` I R T
2004-06-09 12:13 ` Georg Bauhaus
2004-06-09 12:34 ` Warren W. Gay VE3WWG
2004-06-09 21:13 ` Hyman Rosen
2004-06-10 2:51 ` Wes Groleau
2004-06-10 15:57 ` Hyman Rosen
2004-06-10 17:18 ` Pascal Obry
2004-06-10 12:13 ` Marin David Condic
2004-06-11 12:48 ` Warren W. Gay VE3WWG
2004-06-11 17:31 ` Marin David Condic
2004-06-14 2:30 ` Berend de Boer
2004-06-14 2:47 ` I R T
2004-06-14 3:10 ` Hyman Rosen
2004-06-14 11:49 ` Marin David Condic
2004-06-14 16:28 ` Warren W. Gay VE3WWG
2004-06-14 17:34 ` Hyman Rosen
2004-06-15 11:35 ` Marin David Condic
2004-06-15 23:02 ` Brian May
2004-06-16 11:37 ` Marin David Condic
2004-06-21 14:56 ` Jacob Sparre Andersen
2004-06-23 20:19 ` Randy Brukardt
2004-06-15 16:30 ` Warren W. Gay VE3WWG
2004-06-15 11:26 ` Marin David Condic
2004-06-15 16:43 ` Warren W. Gay VE3WWG
2004-06-15 18:51 ` Hyman Rosen
2004-06-15 21:02 ` Warren W. Gay VE3WWG
2004-06-15 22:01 ` Hyman Rosen
2004-06-15 22:08 ` Ed Falis
2004-06-15 22:26 ` Hyman Rosen
2004-06-17 15:50 ` Robert I. Eachus
2004-06-17 16:12 ` Hyman Rosen
2004-06-17 21:05 ` Pascal Obry
2004-06-17 21:47 ` Hyman Rosen
2004-06-17 22:18 ` Georg Bauhaus
2004-06-18 5:19 ` Brian May
2004-06-18 14:44 ` Georg Bauhaus
2004-06-17 23:02 ` Brian May
2004-06-18 7:50 ` Martin Dowie
2004-06-19 20:40 ` Robert I. Eachus
2004-06-19 18:10 ` Ragged arrays of strings (Was: Improving Ada's image) Jacob Sparre Andersen
2004-06-20 22:01 ` Pascal Obry
2004-06-19 20:54 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Robert I. Eachus
2004-06-20 2:20 ` Jeffrey Carter
2004-06-20 4:24 ` tmoran
2004-06-20 15:06 ` Dr. Adrian Wrigley
2004-06-21 15:30 ` Enum'Image (Was: Improving Ada's image) Jacob Sparre Andersen
2004-06-21 16:06 ` Dr. Adrian Wrigley
2004-06-21 16:53 ` Alexander E. Kopilovich
2004-06-22 21:38 ` Jacob Sparre Andersen
2004-06-23 15:42 ` Alexander E. Kopilovich
2004-06-23 17:15 ` Larry Kilgallen
2004-06-22 13:26 ` Dmitry A. Kazakov
2004-06-23 16:04 ` Frank J. Lhota
2004-06-25 0:07 ` Enum'Image Jacob Sparre Andersen
2004-06-25 15:55 ` Enum'Image Frank J. Lhota
2004-06-23 20:29 ` Enum'Image (Was: Improving Ada's image) Randy Brukardt
2004-06-23 23:35 ` Dr. Adrian Wrigley
2004-06-25 0:15 ` Jacob Sparre Andersen
2004-06-26 5:11 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Robert I. Eachus
2004-06-27 1:00 ` Jeffrey Carter
2004-06-27 2:33 ` Robert I. Eachus
2004-06-15 23:30 ` Dale Stanbrough
2004-06-15 21:59 ` Marin David Condic
2004-06-25 4:21 ` Enum'Image (Was: Improving Ada's image) Larry Kilgallen
2004-06-15 19:28 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Alexander E. Kopilovich
2004-06-15 21:04 ` Warren W. Gay VE3WWG
2004-06-15 22:13 ` Marin David Condic
2004-06-16 0:05 ` Alexander E. Kopilovich
2004-06-15 22:08 ` Marin David Condic
2004-06-15 23:06 ` tmoran
2004-06-16 11:47 ` Marin David Condic
2004-06-17 1:33 ` Brian May
2004-06-17 12:09 ` Marin David Condic
2004-06-16 0:56 ` Alexander E. Kopilovich
2004-06-16 11:54 ` Marin David Condic
2004-06-15 1:21 ` Alexander E. Kopilovich
2004-07-01 4:08 ` Dave Thompson
2004-07-04 19:00 ` Robert I. Eachus
2004-06-14 11:45 ` Marin David Condic
2004-06-14 13:20 ` Larry Kilgallen
2004-06-15 11:39 ` Marin David Condic
2004-06-19 23:14 ` Pylinius
2004-06-15 11:41 ` David Starner
2004-06-15 16:29 ` Richard Riehle
2004-06-15 17:06 ` Warren W. Gay VE3WWG
2004-06-11 17:53 ` Hyman Rosen
2004-06-11 18:56 ` Marin David Condic
2004-06-11 23:23 ` Hyman Rosen
2004-06-12 3:08 ` Ada BIND was: " Robert I. Eachus
2004-06-12 12:03 ` Marin David Condic
2004-06-12 12:47 ` Jeff C,
2004-06-13 12:22 ` Marin David Condic
2004-06-14 16:33 ` Warren W. Gay VE3WWG
2004-06-13 6:08 ` Russ
2004-06-13 10:28 ` Georg Bauhaus
2004-06-13 14:49 ` Stephen Leake
2004-06-13 20:51 ` Russ
2004-06-13 23:15 ` Robert I. Eachus
2004-06-14 2:09 ` Hyman Rosen
2004-06-15 0:02 ` Alexander E. Kopilovich
2004-06-15 2:40 ` Brian May [this message]
2004-06-15 12:46 ` Frank J. Lhota
2004-06-15 18:53 ` Jeffrey Carter
2004-06-15 22:09 ` Hyman Rosen
2004-07-01 4:08 ` Dave Thompson
2004-06-14 16:43 ` Warren W. Gay VE3WWG
2004-06-15 11:47 ` Marin David Condic
2004-06-15 16:21 ` Warren W. Gay VE3WWG
2004-06-15 19:36 ` Frank J. Lhota
2004-06-15 19:51 ` Björn Persson
2004-06-16 13:44 ` Frank J. Lhota
2004-06-15 22:13 ` Hyman Rosen
2004-06-15 22:32 ` Björn Persson
2004-06-15 23:04 ` Hyman Rosen
2004-06-15 23:23 ` Brian May
2004-06-15 23:26 ` tmoran
2004-06-16 18:11 ` Ludovic Brenta
2004-06-15 23:33 ` Björn Persson
2004-06-15 23:18 ` Dale Stanbrough
2004-06-15 23:22 ` Hyman Rosen
2004-06-15 23:37 ` Dale Stanbrough
2004-06-15 23:59 ` Björn Persson
2004-06-16 13:38 ` Ada BIND was: Improving Ada's image - Was: 7E7 Flight Controls Larry Kilgallen
2004-06-09 10:52 ` Ada operating systems Peter C. Chapin
2004-06-09 12:07 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Georg Bauhaus
2004-06-11 7:05 ` Hyman Rosen
2004-06-11 15:07 ` Georg Bauhaus
2004-06-09 12:32 ` Marin David Condic
2004-06-15 20:34 ` Larry Kilgallen
2004-06-08 19:51 ` Wes Groleau
2004-06-08 22:26 ` Hyman Rosen
2004-06-09 4:39 ` I R T
2004-06-09 8:13 ` Dmitry A. Kazakov
2004-06-09 12:42 ` Warren W. Gay VE3WWG
2004-06-09 12:38 ` Warren W. Gay VE3WWG
2004-06-09 16:23 ` Robert I. Eachus
2004-06-09 16:38 ` Marius Amado Alves
2004-06-09 20:51 ` Robert I. Eachus
2004-06-10 12:43 ` Marin David Condic
2004-06-15 19:55 ` Larry Kilgallen
2004-06-09 23:45 ` Richard Riehle
2004-06-10 12:58 ` Marin David Condic
2004-06-11 18:03 ` Russ
2004-06-14 16:16 ` Warren W. Gay VE3WWG
2004-06-01 2:45 ` Hyman Rosen
2004-06-04 17:24 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics (why not Universities?) Warren W. Gay VE3WWG
2004-06-04 18:46 ` Marius Amado Alves
2004-06-07 12:58 ` Warren W. Gay VE3WWG
2004-06-07 17:11 ` Ada in colleges and universities Peter C. Chapin
2004-06-07 17:29 ` Marius Amado Alves
2004-06-07 19:47 ` Peter C. Chapin
2004-06-07 18:39 ` Björn Persson
2004-06-07 18:55 ` Marius Amado Alves
2004-06-07 19:21 ` Jerome Hugues
2004-06-07 19:27 ` (see below)
2004-06-07 19:44 ` Marius Amado Alves
2004-06-08 1:14 ` Alexander E. Kopilovich
2004-06-07 22:06 ` Björn Persson
2004-06-07 22:17 ` (see below)
2004-06-08 9:30 ` Adrian Knoth
2004-06-08 17:12 ` Jeffrey Carter
2004-06-08 18:19 ` Adrian Knoth
2004-06-08 9:53 ` Jano
2004-06-09 8:55 ` Pascal Obry
2004-06-07 19:53 ` Peter C. Chapin
2004-06-07 21:54 ` Björn Persson
2004-06-09 3:52 ` I R T
2004-06-09 12:51 ` Björn Persson
2004-06-10 2:58 ` Wes Groleau
2004-06-07 22:03 ` Ludovic Brenta
2004-06-08 0:16 ` Jeffrey Carter
2004-06-08 5:12 ` Ludovic Brenta
2004-06-08 16:14 ` Warren W. Gay VE3WWG
2004-06-06 13:34 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics (why not Universities?) Ralph W. Reid
2004-06-07 2:38 ` Robert I. Eachus
2004-05-30 18:47 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Richard Riehle
2004-05-31 12:57 ` Marin David Condic
2004-05-31 23:36 ` Berend de Boer
2004-06-01 0:41 ` tmoran
2004-06-01 11:04 ` Marin David Condic
2004-06-01 14:44 ` Wes Groleau
2004-06-01 18:43 ` Pascal Obry
2004-06-07 16:35 ` Warren W. Gay VE3WWG
2004-05-31 12:45 ` Marin David Condic
2004-05-31 20:55 ` Improving Ada's image Björn Persson
2004-06-01 0:41 ` Alexander E. Kopilovich
2004-06-01 11:23 ` Marin David Condic
2004-06-01 2:40 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Hyman Rosen
2004-06-01 21:14 ` Per Dalgas Jakobsen
2004-06-02 1:12 ` Ed Falis
2004-06-02 10:59 ` Stefan Nobis
2004-06-03 4:19 ` Jeffrey Carter
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