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Groups > comp.programming > #9661

Re: C is not a low level language

From "R.Wieser" <address@not.available>
Newsgroups comp.lang.c, comp.programming, comp.sys.raspberry-pi
Subject Re: C is not a low level language
Date 2019-02-24 21:36 +0100
Organization Aioe.org NNTP Server
Message-ID <q4uv8j$v0m$1@gioia.aioe.org> (permalink)
References (8 earlier) <q4ucji$vqc$1@dont-email.me> <q4ug9o$q6j$1@gioia.aioe.org> <q4un6q$5bo$1@dont-email.me> <q4upp6$5k2$1@gioia.aioe.org> <q4ur5a$v7v$1@dont-email.me>

Cross-posted to 3 groups.

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Richard,

> But my code protected against that possibility by [snip]

Thats why I said "In this simple example it will work".

> The only way this could break would be if the source string grew between 
> two consecutive lines of code that did not grow that string.

In your example ?  Yes (and the same as I was thinking).

Now imagine that you're programming and you /could/ be working on a 
single-thread string, but as easily on a multi-thread one.  Wouldn't it be 
easier to use a method which will work in either circumstance ?

> If these circumstances are at all likely, it seems to me that it is better 
> to protect against them than to succumb blindly to them.

True.  But that only goes as far as the programmer can imagine such attacks. 
"strncpy" is ment as a "last ditch" effort to safeguard against the 
/unforseen/ circumstances which could lead to memory/stack being clobbered. 
My suggestion to provide it an argument that is one less than what the 
buffer can actually hold is just an extension on that.

Personally I would not mind at all when it would throw or return an error 
when the target buffer was found to be too small for the source string.   It 
should never happen, and for that reason should not be silently ignored 
either.   But thats just my take on it, YMMV.

Regards,
Rudy Wieser

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Thread

Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-24 12:40 +0800
  Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 05:16 +0000
    Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-24 13:20 +0800
      Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-24 13:24 +0800
      Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-24 19:45 +0800
      Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 13:09 +0000
        Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 14:38 +0000
          Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 15:18 +0000
            Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-24 17:21 +0100
              Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 17:43 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-24 20:17 +0100
              Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 18:19 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-24 20:02 +0100
                Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 19:26 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-24 21:36 +0100
                Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 20:47 +0000
                Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 21:10 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 08:25 +0100
                Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-25 12:24 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 17:04 +0100
                Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-25 16:52 +0000
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-24 17:59 -0800
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-25 08:46 +0100
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 09:36 +0100
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-25 10:13 +0100
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-26 09:56 +0100
                Re: C is not a low level language Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-02-25 14:12 +0000
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 12:20 +0000
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-25 13:36 -0800
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 10:29 +0200
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 09:41 +0100
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 10:55 +0200
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 10:24 +0100
                Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 21:03 +0000
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 08:58 +0100
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-25 09:40 +0100
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 10:01 +0100
              Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-24 12:55 -0800
                Re: C is not a low level language "R.Wieser" <address@not.available> - 2019-02-25 08:31 +0100
            Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 17:42 +0000
              Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 18:19 +0000
            Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-24 17:56 +0000
              Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-24 18:23 +0000
                Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 20:58 +0000
              Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 20:52 +0000
                Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-25 16:31 +0000
              Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-25 14:01 -0800
                Re: C is not a low level language scott@slp53.sl.home (Scott Lurndal) - 2019-02-25 23:04 +0000
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-25 15:53 -0800
                Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-28 16:07 +0000
              Re: C is not a low level language Björn Lundin <b.f.lundin@gmail.com> - 2019-02-25 20:50 +0100
                Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-28 16:04 +0000
                Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-28 16:25 +0000
                Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-28 11:56 -0500
                Re: C is not a low level language "NY" <me@privacy.net> - 2019-02-28 19:45 +0000
              Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-25 17:55 +0000
                Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-28 16:03 +0000
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-28 11:25 -0800
                Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-28 19:30 +0000
          Re: C is not a low level language Jasen Betts <jasen@xnet.co.nz> - 2019-02-24 20:47 +0000
            Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 21:29 +0000
              Re: C is not a low level language Jasen Betts <jasen@xnet.co.nz> - 2019-02-25 20:16 +0000
      Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-24 12:53 -0800
      Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 09:49 +0200
    Re: C is not a low level language Björn Lundin <b.f.lundin@gmail.com> - 2019-02-25 21:07 +0100
      Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 22:59 +0000
        Re: C is not a low level language Björn Lundin <b.f.lundin@gmail.com> - 2019-02-26 09:57 +0100
          Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-26 09:59 +0000
  Re: C is not a low level language Eric Stevens <eric.stevens@sum.co.nz> - 2019-02-24 19:54 +1300
    Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-24 07:56 +0000
      Re: C is not a low level language Eric Stevens <eric.stevens@sum.co.nz> - 2019-02-24 21:58 +1300
        Re: C is not a low level language "A. Dumas" <alexandre@dumas.fr.invalid> - 2019-02-24 10:57 +0100
        Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-24 10:13 +0000
        Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 10:47 +0000
          Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-24 08:48 -0500
            Re: C is not a low level language The Natural Philosopher <tnp@invalid.invalid> - 2019-02-24 14:42 +0000
            Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 07:15 +0000
              Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-25 09:25 -0500
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 15:03 +0000
                Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-25 12:10 -0500
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 17:58 +0000
                Re: C is not a low level language Axel Berger <Spam@Berger-Odenthal.De> - 2019-02-25 17:44 +0100
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 19:18 +0200
            Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 10:35 +0200
              Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-25 10:44 +0000
                Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-02-25 12:29 +0000
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 14:26 +0000
                Re: C is not a low level language "NY" <me@privacy.net> - 2019-02-25 17:08 +0000
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 20:08 +0200
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 18:00 +0000
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-27 22:37 -0800
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-28 02:25 -0800
                Re: C is not a low level language Diesel <nobody@haph.org> - 2019-03-05 04:29 +0000
              Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 12:27 +0000
              Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-25 09:36 -0500
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 15:05 +0000
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 19:20 +0200
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-25 23:02 +0000
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-26 06:52 +0000
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-26 12:41 +0200
                Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-26 12:20 +0000
                Re: C is not a low level language David Brown <david.brown@hesbynett.no> - 2019-02-26 14:01 +0100
                Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-26 08:48 -0500
                Re: C is not a low level language Björn Lundin <b.f.lundin@gmail.com> - 2019-02-26 19:20 +0100
              Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-25 10:04 -0500
        Re: C is not a low level language lonelydad <lonelydad58@gmail.com> - 2019-02-24 14:44 +0000
        Re: C is not a low level language "U-laptop\\Norah" <Norah@laptop.i-did-not-set--mail-host-address--so-tickle-me> - 2019-02-27 16:16 -0600
          Re: C is not a low level language Eric Stevens <eric.stevens@sum.co.nz> - 2019-03-01 12:12 +1300
            Re: C is not a low level language Richard Heathfield <rjh@cpax.org.uk> - 2019-03-01 00:19 +0000
      Re: C is not a low level language Gene Wirchenko <genew@telus.net> - 2019-02-24 19:59 -0800
        Re: C is not a low level language Bill Findlay <findlaybill@blueyonder.co.uk> - 2019-02-25 16:10 +0000
        Re: C is not a low level language Björn Lundin <b.f.lundin@gmail.com> - 2019-02-25 21:02 +0100
          Re: C is not a low level language Lars Enderin <lars.enderin@telia.com> - 2019-02-26 00:37 +0100
            Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-25 19:09 -0500
            Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-26 06:52 +0000
    Re: C is not a low level language T <T@invalid.invalid> - 2019-02-24 00:30 -0800
      Re: C is not a low level language T <T@invalid.invalid> - 2019-02-24 00:31 -0800
      Re: C is not a low level language Ahem A Rivet's Shot <steveo@eircom.net> - 2019-02-24 10:16 +0000
    Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-24 11:22 +0000
      Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-24 08:51 -0500
        Re: C is not a low level language pyotr filipivich <phamp@mindspring.com> - 2019-02-24 07:20 -0800
          Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-24 15:35 +0000
            Re: C is not a low level language "Mayayana" <mayayana@invalid.nospam> - 2019-02-24 11:05 -0500
            Re: C is not a low level language pyotr filipivich <phamp@mindspring.com> - 2019-02-24 14:39 -0800
              Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-24 19:11 -0800
              Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-25 09:41 -0500
                Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-25 14:53 +0000
                Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-25 10:19 -0500
                Re: C is not a low level language David Brown <david.brown@hesbynett.no> - 2019-02-25 16:38 +0100
                Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-25 11:20 -0500
                Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-25 17:49 +0000
                Re: C is not a low level language David Brown <david.brown@hesbynett.no> - 2019-02-26 09:18 +0100
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 12:17 -0500
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 20:25 +0200
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 13:40 -0500
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-26 12:45 +0200
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-26 08:02 -0500
                Re: C is not a low level language Wolf K <wolfmac@sympatico.ca> - 2019-02-26 09:11 -0500
                Re: C is not a low level language Diesel <nobody@haph.org> - 2019-03-05 04:29 +0000
                Re: C is not a low level language David Brown <david.brown@hesbynett.no> - 2019-02-26 09:23 +0100
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-26 08:02 -0500
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-26 17:57 +0200
                Re: C is not a low level language Diesel <nobody@haph.org> - 2019-03-05 04:29 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 17:42 -0500
                Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-25 22:33 +0000
                Re: C is not a low level language David Brown <david.brown@hesbynett.no> - 2019-02-26 09:30 +0100
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 12:17 -0500
                Re: C is not a low level language Keith Thompson <kst-u@mib.org> - 2019-02-25 13:52 -0800
                Re: C is not a low level language "NY" <me@privacy.net> - 2019-02-25 15:20 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 12:17 -0500
                Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-25 18:47 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 13:50 -0500
                Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-25 18:59 +0000
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-25 20:15 +0200
                Re: C is not a low level language scott@slp53.sl.home (Scott Lurndal) - 2019-02-25 18:38 +0000
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-26 12:49 +0200
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 13:40 -0500
                Re: C is not a low level language Wouter Verhelst <w@uter.be> - 2019-02-26 12:55 +0200
                Re: C is not a low level language scott@slp53.sl.home (Scott Lurndal) - 2019-02-26 16:29 +0000
                Re: C is not a low level language Diesel <nobody@haph.org> - 2019-03-05 04:29 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-03-04 23:43 -0500
                Re: C is not a low level language "NY" <me@privacy.net> - 2019-02-25 18:16 +0000
                Re: C is not a low level language "NY" <me@privacy.net> - 2019-02-25 17:44 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 13:05 -0500
                Re: C is not a low level language Robert Wessel <robertwessel2@yahoo.com> - 2019-02-26 00:51 -0600
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-26 10:58 +0100
                Re: C is not a low level language Robert Wessel <robertwessel2@yahoo.com> - 2019-02-26 10:53 -0600
                Re: C is not a low level language Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-02-26 17:49 +0000
                Re: C is not a low level language scott@slp53.sl.home (Scott Lurndal) - 2019-02-26 18:11 +0000
                Re: C is not a low level language Bart <bc@freeuk.com> - 2019-02-26 18:24 +0000
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-26 19:24 +0100
                Re: C is not a low level language "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-26 19:44 +0100
                Re: C is not a low level language nobody@example.org (Scott) - 2019-02-26 06:33 +0000
                Re: C is not a low level language nospam <nospam@nospam.invalid> - 2019-02-25 12:17 -0500
        Re: C is not a low level language Gene Wirchenko <genew@telus.net> - 2019-02-24 20:03 -0800
      Re: C is not a low level language pyotr filipivich <phamp@mindspring.com> - 2019-02-24 14:56 -0800
  Re: C is not a low level language Jasen Betts <jasen@xnet.co.nz> - 2019-02-24 20:43 +0000
    Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-25 14:14 +0800
      Re: C is not a low level language "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2019-02-25 10:45 +0000
        Re: C is not a low level language "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2019-02-25 19:04 +0800

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