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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Reversing a linked list |
| Date | 2011-09-18 17:30 -0700 |
| Organization | None to speak of |
| Message-ID | <ln4o0974s6.fsf@nuthaus.mib.org> (permalink) |
| References | (4 earlier) <xXUcq.7973$mA3.5987@newsfe19.iad> <lnty8a7v8w.fsf@nuthaus.mib.org> <f5628460-c702-43ac-b946-7f8a274d1b0e@bi2g2000vbb.googlegroups.com> <lnhb4a6yqm.fsf@nuthaus.mib.org> <d648e169-8c24-43a5-9700-c15128ac5235@b28g2000yqa.googlegroups.com> |
henry eshbaugh <henryeshbaugh@gmail.com> writes:
> On Sep 18, 4:28 am, Keith Thompson <ks...@mib.org> wrote:
>> What do you mean, it "isn't too bad"?
>
> It's not unreadable. Sorry for not being clear.
>
>> It's not merely coding style. The identifier "__reverse_list" is
>> reserved to the implementation. Using it in your own code makes your
>> program's behavior undefined.
>
> Nope.
Yup.
> Here's an example C program:
>
>
> void __foo(void)
> {
> return;
> }
>
> int main()
> {
> ___foo();
> return 0;
> }
You define your function as "__foo" and call it as "___foo()". Was that
a typo?
> And here's the assembly generated by GCC:
[96 lines deleted]
>
>
> Note ".globl ___foo". Like I said, GCC generates assembly with
> identifiers _[name], so you can prefix names with "__." So, again,
> it's largely a coding style issue.
I never said it wouldn't work with whatever implementation you
happen to be using. I didn't even say it would fail under *any*
implementation. I said that the behavior is undefined.
Identifiers starting with "__" are reserved to the implementation.
If you define such an identifier yourself, your code's behavior
is undefined. Among the infinitely many possible manifestations
of undefined behavior is that your code behaves just as you intend
it to. Another possibility is that your implementation has chosen
to use the name "__foo" for its own purposes, and that attempting
to use it yourself causes a conflict.
By not defining your own identifiers starting with an underscore,
you remove that risk.
--
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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Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-16 08:30 +0200
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-16 08:33 +0200
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-16 12:51 +0100
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-16 14:18 +0200
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-16 14:26 +0200
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-16 07:09 -0700
Re: Reversing a linked list ImpalerCore <jadill33@gmail.com> - 2011-09-16 08:28 -0700
Re: Reversing a linked list falk@rahul.net (Edward A. Falk) - 2011-09-16 16:34 +0000
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-16 09:28 -0700
Re: Reversing a linked list ImpalerCore <jadill33@gmail.com> - 2011-09-16 11:12 -0700
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 20:01 -0500
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-16 21:56 +0100
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 20:16 -0500
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-17 02:48 +0100
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 22:15 -0500
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-17 07:40 +0200
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 01:24 -0500
Re: Reversing a linked list cri@tiac.net (Richard Harter) - 2011-09-17 15:07 +0000
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-17 17:47 +0200
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-17 17:54 +0200
Re: Reversing a linked list Michael Press <rubrum@pacbell.net> - 2011-09-27 19:21 -0700
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-17 12:00 +0100
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 23:53 -0500
Re: Reversing a linked list ImpalerCore <jadill33@gmail.com> - 2011-09-16 07:21 -0700
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-16 16:47 +0200
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-16 08:20 -0700
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 20:25 -0500
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-16 22:32 +0100
Re: Reversing a linked list pete <pfiland@mindspring.com> - 2011-09-16 17:53 -0400
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 19:48 -0500
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-17 02:41 +0100
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 22:57 -0500
Re: Reversing a linked list "BartC" <bc@freeuk.com> - 2011-09-17 12:48 +0100
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-17 13:55 +0200
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 23:39 -0500
Re: Reversing a linked list HENRY Eshbaugh <henryeshbaugh@gmail.com> - 2011-09-16 16:56 -0700
Re: Reversing a linked list Ian Collins <ian-news@hotmail.com> - 2011-09-17 12:09 +1200
Re: Reversing a linked list HENRY Eshbaugh <henryeshbaugh@gmail.com> - 2011-09-16 19:53 -0700
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 23:00 -0500
Re: Reversing a linked list Jonathan Leffler <jleffler@earthlink.net> - 2011-09-16 23:20 -0700
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-17 13:46 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-17 19:51 -0700
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-18 01:28 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-18 15:39 -0700
Re: Reversing a linked list Kleuskes & Moos <kleuske@somewhere.else.net> - 2011-09-18 22:43 +0000
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-18 17:54 -0700
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-18 21:20 -0400
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-18 17:30 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-18 17:51 -0700
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-18 21:34 -0400
Re: Reversing a linked list Robert Wessel <robertwessel2@yahoo.com> - 2011-09-18 21:25 -0500
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-19 09:56 -0700
Re: Reversing a linked list gazelle@shell.xmission.com (Kenny McCormack) - 2011-09-19 17:16 +0000
Re: Reversing a linked list Willem <willem@toad.stack.nl> - 2011-09-19 17:25 +0000
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-19 23:40 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-20 17:55 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-20 17:48 -0700
Re: Reversing a linked list Geoff <geoff@invalid.invalid> - 2011-09-20 19:12 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-21 10:15 -0700
Re: Reversing a linked list David Resnick <lndresnick@gmail.com> - 2011-09-22 08:43 -0700
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-23 02:45 -0700
Re: Reversing a linked list David Resnick <lndresnick@gmail.com> - 2011-09-23 05:38 -0700
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-23 07:58 -0700
Re: Reversing a linked list David Resnick <lndresnick@gmail.com> - 2011-09-23 08:15 -0700
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-23 18:00 +0100
Re: Reversing a linked list David Resnick <lndresnick@gmail.com> - 2011-09-23 10:49 -0700
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-23 20:05 +0100
Re: Reversing a linked list pete <pfiland@mindspring.com> - 2011-09-23 18:05 -0400
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-24 00:19 +0100
Re: Reversing a linked list ImpalerCore <jadill33@gmail.com> - 2011-09-23 09:25 -0700
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-22 22:49 +0300
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-20 19:51 -0700
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-21 09:51 -0700
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-21 11:21 -0700
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-20 23:00 -0400
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-21 09:47 -0700
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-23 11:22 +0300
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-23 08:20 -0700
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-23 18:12 +0100
Re: Reversing a linked list Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 13:13 -0800
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-23 23:49 +0300
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-24 08:15 -0400
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-24 20:15 +0300
Re: Reversing a linked list Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 13:28 -0800
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-02-12 01:41 +0200
Re: Reversing a linked list Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-08 09:08 -0800
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-03-13 17:21 +0200
Re: Reversing a linked list Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 13:04 -0800
Re: Reversing a linked list Seebs <usenet-nospam@seebs.net> - 2011-09-23 01:46 +0000
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-18 21:17 -0400
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 23:50 -0500
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-18 01:29 -0700
Re: Reversing a linked list Seebs <usenet-nospam@seebs.net> - 2011-09-18 07:03 +0000
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-17 02:13 +0100
Re: Reversing a linked list HENRY Eshbaugh <henryeshbaugh@gmail.com> - 2011-09-16 19:52 -0700
Re: Reversing a linked list Willem <willem@toad.stack.nl> - 2011-09-17 08:58 +0000
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-18 15:32 -0700
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-18 21:36 -0400
Re: Reversing a linked list cri@tiac.net (Richard Harter) - 2011-09-19 05:24 +0000
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-19 08:21 -0400
Re: Reversing a linked list cri@tiac.net (Richard Harter) - 2011-09-19 14:28 +0000
Re: Reversing a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-19 17:01 +0100
Re: Reversing a linked list cri@tiac.net (Richard Harter) - 2011-09-19 16:25 +0000
Re: Reversing a linked list henry eshbaugh <henryeshbaugh@gmail.com> - 2011-09-21 10:41 -0700
Re: Reversing a linked list Kleuskes & Moos <kleuske@somewhere.else.net> - 2011-09-21 17:58 +0000
Re: Reversing a linked list James Kuyper <jameskuyper@verizon.net> - 2011-09-21 14:07 -0400
Re: Reversing a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-21 11:15 -0700
Re: Reversing a linked list Keith Thompson <kst-u@mib.org> - 2011-09-21 11:37 -0700
Re: Reversing a linked list Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-23 11:50 +0300
Re: Reversing a linked list Seebs <usenet-nospam@seebs.net> - 2011-09-23 01:46 +0000
Re: Reversing a linked list Geoff <geoff@invalid.invalid> - 2011-09-18 18:22 -0700
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-16 19:37 -0500
Re: Reversing a linked list jacob navia <jacob@spamsink.net> - 2011-09-17 07:52 +0200
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 02:09 -0500
Re: Reversing a linked list Ian Collins <ian-news@hotmail.com> - 2011-09-17 19:35 +1200
Re: Reversing a linked list "Tony" <nospamme@ever.net> - 2011-09-17 03:35 -0500
Programming languages jacob navia <jacob@spamsink.net> - 2011-09-17 22:14 +0200
Re: Programming languages "Tony" <nospamme@ever.net> - 2011-09-18 00:11 -0500
Re: Programming languages jacob navia <jacob@spamsink.net> - 2011-09-18 08:37 +0200
Re: Programming languages Seebs <usenet-nospam@seebs.net> - 2011-09-18 07:03 +0000
Re: Programming languages jacob navia <jacob@spamsink.net> - 2011-09-18 09:50 +0200
Re: Programming languages Keith Thompson <kst-u@mib.org> - 2011-09-18 01:31 -0700
Re: Programming languages James Kuyper <jameskuyper@verizon.net> - 2011-09-18 06:43 -0400
Re: Programming languages Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-09-18 07:42 -0700
Re: Programming languages "Tony" <nospamme@ever.net> - 2011-09-18 04:05 -0500
Re: Programming languages Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-09-18 07:40 -0700
Re: Reversing a linked list Gene <gene.ressler@gmail.com> - 2011-09-22 06:59 -0700
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