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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Minimum amount of syntax for C language
Date: Thu, 17 Nov 2016 11:56:03 -0800
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Thiago Adams <thiago.adams@gmail.com> writes:
> On Thursday, November 17, 2016 at 3:03:40 PM UTC-2, John Bode wrote:
[...]
>> Not *required*, but one place where it is useful (and not immediately a
>> sign of poor design or practice) is bailing out of a deeply nested loop
>> or multi-step resource allocation process:
>> 
>>     for ( ... )
>>       for ( ... )
>>         for ( ... )
>>           if ( some_error )
>>             goto exit:
>> 
>>     exit: // clean up
>> 
>> Obviously, you'll want to structure your code such that you avoid that
>> situation, but sometimes it simply isn't possible (or, the level of
>> effort required to do so is not worth the tradeoff).
>
> The other option to exit is add an external do {} while(0) and break.
>
> do
> {
> if ()
> {
>  if ()
>   {
>    if ()
>    {
>      break; //ok
>    }
>   }
>  }
> } while(0);

That's not helpful if you need to bail out of multiple nested loops.

[...]

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"