linux-kernel - Re: condingstyle, was Re: utrace comments

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Date:	Wed, 02 May 2007 05:55:02 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Howells <dhowells@...hat.com>
Cc:	"John Anthony Kazos Jr." <jakj@...-k-j.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: condingstyle, was Re: utrace comments

David Howells <dhowells@...hat.com> writes:

> Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
>> Not lining up with the code following the if statement is also
>> a plus.  Because it clearly delineates the conditions from the code.
>
> But the condition doesn't line up with the code:

Exactly.  The condition not lining up with the following code helps
code helps separate the two.

> 	if (veryverylengthycondition1 &&
> 	    smallcond2 &&
> 	    (conditionnumber3a ||
> 	     condition3b)) {
> 		this_is_some_code();
> 		this_is_some_more_code();
> 	}
>
> Personally, for complicated conditions like this, I prefer:
>
> 	if (veryverylengthycondition1 &&
> 	    smallcond2 &&
> 	    (conditionnumber3a ||
> 	     condition3b)
> 	    ) {
> 		this_is_some_code();
> 		this_is_some_more_code();
> 	}
>
> But that seems to offend Andrew for some reason (or was it Christoph? or
> both?).

Yes. 

Although I suspect simply not tucking the trailing brace is as
good or better.  I believe not putting the beginning brace at
the beginning of the line is a violation of coding style.

	if (veryverylengthycondition1 &&
	    smallcond2 &&
	    (conditionnumber3a ||
	     condition3b))
	{
		this_is_some_code();
		this_is_some_more_code();
	}


However there is the practical way to solve this if you have
a sufficiently large conditional, or the conditional appears
several times.

	static inline int test_func()
	{
		if (!veryverylengthycondition1)
                	return 0;
  		if (!smallcond2)
			return 0;
		if (conditionnumber3A)
			return 1;
		if (condition3b)
			return 1;
		return 0;
	}

	if (test_func()) {
        	this_is_some_code();
		this_is_some_more_code();
        }	

Eric
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