Re: dereferencing problem

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.c
Subject	Re: dereferencing problem
Date	2014-04-13 22:18 +0000
Organization	Aioe.org NNTP Server
Message-ID	<lif2eo$m43$1@speranza.aioe.org> (permalink)
References	(1 earlier) <licf4i$svt$1@dont-email.me> <j6kjk9hhqq8c8ralv4gg2fklndj5465nsn@4ax.com> <lickok$s4l$1@dont-email.me> <b4hkk9t3gdp00gk731mv1ifincfektp5kv@4ax.com> <liefl4$pbo$1@dont-email.me>

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Bill Cunningham <nospam@nspam.invalid> wrote:
> Barry Schwarz wrote:

(snip)
>> Yes smarter ass, I'm definitely not as good as some of the others
>> here.  That's why when I ask for help I try not to make assumptions
>> about the problem.

>> These messages tell us that your original assertion that the error
>> occurred on line 7 was wrong.  They also tell us that your assertion
>> that you only had one dereference was also wrong.

>> Several people responded telling you that pa had never been assigned a
>> value.  They were correct but these error messages tell us that the
>> compiler did not detect this error.  It was complaining about the fact
>> that while addrinfo was indeed known to be a struct type you had never
>> provided a complete definition for that type.  So by taking the lazy
>> way out, you led people down the wrong path.
 
> No I didn't. They were right. They were smarter than the compiler. 
> Don't try to make me look like I'm trying to deceive people. 
> I was having some problems with C In  practical use with BSD sockets.

It does help a lot to give the actual messages early. 

Posting no code, or hundreds of lines for us to search through,
could be considered lazy. 

Compilers should be able to detect that a pointer was never
assigned a value before being used, but many don't. The sample
was small enough that it was pretty easy to see.


-- glen

Thread

dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 18:13 -0400
  Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 18:36 -0400
    Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 18:56 -0400
      Re: dereferencing problem glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-04-12 23:16 +0000
        Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 19:52 -0400
        Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 19:57 -0400
          Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 01:00 -0700
        Re: dereferencing problem Les Cargill <lcargill99@comcast.com> - 2014-04-14 01:10 -0500
          Re: dereferencing problem glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-04-14 06:50 +0000
            Re: dereferencing problem Les Cargill <lcargill99@comcast.com> - 2014-04-14 07:42 -0500
            Re: dereferencing problem "Charles Richmond" <numerist@aquaporin4.com> - 2014-04-14 14:36 -0500
              Re: dereferencing problem glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-04-14 20:10 +0000
    Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-12 16:50 -0700
      Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 20:12 -0400
        Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 20:30 -0400
          Re: dereferencing problem Richard Damon <Richard@Damon-Family.org> - 2014-04-12 20:39 -0400
            Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 21:01 -0400
              Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 13:02 +1200
          Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 12:53 +1200
          Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 20:58 -0400
            Re: dereferencing problem Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2014-04-12 21:04 -0400
          Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 01:13 -0700
            Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-13 12:54 -0400
              Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 14:14 -0700
        Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 01:12 -0700
          Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-13 12:57 -0400
            Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 14:22 -0700
            Re: dereferencing problem glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-04-13 22:18 +0000
    Re: dereferencing problem Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2014-04-12 21:02 -0400
      Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 13:03 +1200
        Re: dereferencing problem Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2014-04-12 21:07 -0400
      Re: dereferencing problem glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-04-13 01:18 +0000
        Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 13:19 +1200
      Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-12 21:25 -0400
        Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 13:30 +1200
        Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 01:18 -0700
          Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-13 12:50 -0400
            Re: dereferencing problem Barry Schwarz <schwarzb@dqel.com> - 2014-04-13 14:24 -0700
              Re: dereferencing problem "Osmium" <r124c4u102@comcast.net> - 2014-04-13 18:48 -0500
              Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-14 14:46 -0400
                Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-14 15:58 -0400
                Re: dereferencing problem "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-14 16:08 -0400
        Re: dereferencing problem Herbert Rosenau <os2guy@pc-rosenau.de> - 2014-05-03 14:19 +0200
          Re: dereferencing problem "Bill Cunningaham" <nospam@nspam.invalid> - 2014-05-03 11:29 -0400
            Re: dereferencing problem "Bill Cunningaham" <nospam@nspam.invalid> - 2014-05-03 11:42 -0400
          Re: dereferencing problem Richard <rgrdev_@gmail.com> - 2014-05-03 21:15 +0200
  Re: dereferencing problem Ian Collins <ian-news@hotmail.com> - 2014-04-13 11:15 +1200

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