Re: Right trim string function in C

From	Kaz Kylheku <kaz@kylheku.com>
Newsgroups	comp.lang.c
Subject	Re: Right trim string function in C
Date	2012-02-16 00:36 +0000
Organization	A noiseless patient Spider
Message-ID	<20120215163101.672@kylheku.com> (permalink)
References	<jh3n08$6hs$1@speranza.aioe.org> <slrn3vfsjjltig.1lm.ike@iceland.freeshell.org> <jhf07u$d0q$1@dont-email.me> <404c0142-798d-41f9-977c-40847893584b@d15g2000yqg.googlegroups.com> <jhgaa1$7h7$2@news.xmission.com>

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On 2012-02-15, Kenny McCormack <gazelle@shell.xmission.com> wrote:
> In article <404c0142-798d-41f9-977c-40847893584b@d15g2000yqg.googlegroups.com>,
> Malcolm McLean  <malcolm.mclean5@btinternet.com> wrote:
>>On Feb 15, 1:00 am, "BartC" <b...@freeuk.com> wrote:
>>>
>>> And, on a machine which doesn't have such problems (eg. flat address space,
>>> str not located at the beginning of that space, and the ability to compare
>>> pointers even when the memory locations involved do not exist), would it
>>> still be undefined behaviour?
>>>
>>Yes. "It works" is in fact the most dangerous form of undefined
>>behaviour.
>
> Hah hah.  Of course, I understand this phrase in the CLC context, but I have
> to point out that I think most working code in the real world does, in fact,
> have undefined behavior coursing through its veins.

Simply including a nonstandard header which is not present in the program is
undefined behavior. Calling external functions that are not in ISO C and not
defined in the program is also undefined behavior.

A program that includes <unistd.h> and calls open is undefined according to
ISO C, but may be a well-defined POSIX C program.

This is why obsessing over undefined behavior is silly. Undefined behavior
just means, "you're leaving that province of C programming where ISO C
provides a useful opinion".

It's all just opinions, because at the end of the day, the compiler and library
may do something else, and you still want to ship something.

Only what actually happens in the machine you're programming is "behavior".

Thread

Right trim string function in C peter <pc722@nospam.mail.com.br> - 2012-02-10 18:17 +0000
  Re: Right trim string function in C James Kuyper <jameskuyper@verizon.net> - 2012-02-10 13:36 -0500
    Re: Right trim string function in C Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-10 11:00 -0800
      Re: Right trim string function in C "BartC" <bc@freeuk.com> - 2012-02-14 12:41 +0000
        Re: Right trim string function in C "BartC" <bc@freeuk.com> - 2012-02-14 14:14 +0000
          Re: Right trim string function in C Ike Naar <ike@iceland.freeshell.org> - 2012-02-15 00:03 +0000
            Re: Right trim string function in C "BartC" <bc@freeuk.com> - 2012-02-15 01:00 +0000
              Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-15 02:08 +0000
              Re: Right trim string function in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-15 03:08 -0800
                Re: Right trim string function in C gazelle@shell.xmission.com (Kenny McCormack) - 2012-02-15 13:00 +0000
                Re: Right trim string function in C Kaz Kylheku <kaz@kylheku.com> - 2012-02-16 00:36 +0000
              Re: Right trim string function in C Kaz Kylheku <kaz@kylheku.com> - 2012-02-16 00:28 +0000
              Re: Right trim string function in C gordonb.7bjv1@burditt.org (Gordon Burditt) - 2012-03-12 03:27 -0500
                Re: Right trim string function in C China Blue Water Navy <chine.bleu@yahoo.com> - 2012-03-12 03:57 -0800
        Re: Right trim string function in C Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-14 09:59 -0800
      Re: Right trim string function in C Kaz Kylheku <kaz@kylheku.com> - 2012-02-14 12:56 +0000
        Re: Right trim string function in C Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-14 09:17 -0800
        Re: Right trim string function in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-14 10:10 -0800
  Re: Right trim string function in C Barry Schwarz <schwarzb@dqel.com> - 2012-02-10 11:30 -0800
    Re: Right trim string function in C James Kuyper <jameskuyper@verizon.net> - 2012-02-10 14:45 -0500
      Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-10 22:15 +0000
        Re: Right trim string function in C James Kuyper <jameskuyper@verizon.net> - 2012-02-10 17:21 -0500
          Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-10 23:25 +0000
          Re: Right trim string function in C Keith Thompson <kst-u@mib.org> - 2012-02-10 15:31 -0800
      Re: Right trim string function in C pete <pfiland@mindspring.com> - 2012-02-10 17:17 -0500
        Re: Right trim string function in C Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-10 15:12 -0800
  Re: Right trim string function in C "Morris Keesan" <mkeesan@post.harvard.edu> - 2012-02-10 14:46 -0500
    Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-10 21:56 +0000
      Re: Right trim string function in C James Kuyper <jameskuyper@verizon.net> - 2012-02-10 17:08 -0500
        Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-10 23:14 +0000
          Re: Right trim string function in C David Thompson <dave.thompson2@verizon.net> - 2012-02-18 23:11 -0500
      Re: Right trim string function in C Keith Thompson <kst-u@mib.org> - 2012-02-11 12:06 -0800
      Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 20:12 +0000
      Re: Right trim string function in C Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-08 13:10 -0800
  Re: Right trim string function in C "Scott Fluhrer" <sfluhrer@ix.netcom.com> - 2012-02-10 15:39 -0500
  Re: Right trim string function in C Shao Miller <sha0.miller@gmail.com> - 2012-02-11 03:52 -0500
    Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 13:50 +0000
      Re: Right trim string function in C Shao Miller <sha0.miller@gmail.com> - 2012-02-11 11:47 -0500
        Re: Right trim string function in C Shao Miller <sha0.miller@gmail.com> - 2012-02-11 12:20 -0500
        Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 20:57 +0000
          Re: Right trim string function in C Shao Miller <sha0.miller@gmail.com> - 2012-02-11 17:43 -0500
  Re: Right trim string function in C Willem <willem@toad.stack.nl> - 2012-02-11 11:57 +0000
    Re: Right trim string function in C Willem <willem@toad.stack.nl> - 2012-02-11 18:11 +0000
  Re: Right trim string function in C August Karlstrom <fusionfile@gmail.com> - 2012-02-11 18:41 +0100
    Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 19:58 +0000
      Re: Right trim string function in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-11 13:11 -0800
      Re: Right trim string function in C August Karlstrom <fusionfile@gmail.com> - 2012-02-11 22:18 +0100
        Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 23:48 +0000
          Re: Right trim string function in C August Karlstrom <fusionfile@gmail.com> - 2012-02-12 02:20 +0100
          Re: Right trim string function in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-12 03:44 -0800
            Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-12 14:01 +0000
              Re: Right trim string function in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-12 11:06 -0800
                Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-12 19:34 +0000
                Re: Right trim string function in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-12 23:35 +0000
    Re: Right trim string function in C Barry Schwarz <schwarzb@dqel.com> - 2012-02-11 14:27 -0800
      Re: Right trim string function in C August Karlstrom <fusionfile@gmail.com> - 2012-02-12 14:40 +0100

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