linux-kernel - Re: coding style

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Message-ID: <20070616142219.GG8923@clifford.at>
Date:	Sat, 16 Jun 2007 16:22:19 +0200
From:	Clifford Wolf <clifford@...fford.at>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	dave young <hidave.darkstar@...il.com>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>, Willy Tarreau <w@....eu>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: coding style

Hey,

On Fri, Jun 15, 2007 at 11:16:08AM +0200, Jan Engelhardt wrote:
> >> so which one is preferred for the kernel?
> 
> err = very_long_function_name(lots_of_arguments,
>                               less,
>                               less,
>                               less,
>                               less,
>                               even_more_arguments,
>                               more_of_this,
>                               more_of_that,
>                               more,
>                               more,
>                               more);
> 
> IMO, preferred:
> 
> err = very_long_function_name(lots_of_arguments, less, less, less, less,
>       even_more_arguments, more_of_this, more_of_that, more, more, more);

Looking at e.g. the fuction declarations in fs/namespace.c shows very well
that there seams to be no 'preferred in the kernel source' for this
question.

I presonally prefer indenting the continuation of a line with TWO
additional tabs so it is good to distinguish from a normally indented
command block. E.g.:

static int function_with_long_name(int and_many_arguments,
		int not_fitting_in_a_signle_line_anymore)
{
	if (and_many_arguments > not_fitting_in_a_signle_line_anymore &&
			not_fitting_in_a_signle_line_anymore > 0)
		and_many_arguments += not_fitting_in_a_signle_line_anymore;
	else
		not_fitting_in_a_signle_line_anymore *=
				not_fitting_in_a_signle_line_anymore;
	return and_many_arguments ^ not_fitting_in_a_signle_line_anymore;
}

maybe this won't win a design contest but it is a simple and non-ambiguous
coding style and afaics does not conflict with the CodingStyle document.

yours,
 - clifford

-- 
When your hammer is C++, everything begins to look like a thumb.
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