linux-kernel - Re: [patch] checkpatch: putting the && or || on the wrong line

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Date:	Tue, 4 Jan 2011 11:38:36 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Dan Carpenter <error27@...il.com>,
	Andy Whitcroft <apw@...onical.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	joe@...ches.com
Subject: Re: [patch] checkpatch: putting the && or || on the wrong line

On Tue, Jan 04, 2011 at 08:59:00AM +0300, Dan Carpenter wrote:
> This patch makes checkpatch.pl complain if you break up conditions in
> the wrong way.
> 
> Wrong:
> 	if ((really_long_condition)
> 		&& (second_condition)) { ...
> Right:
> 	if ((really_long_condition) &&
> 		(second_condition)) { ...

As far as I can tell, the convention in mathematical typesetting is to
put operators on the left, not the right.  When the conditions are short
of there are more lines, that allows you to left-align on the repeated
operator.

--b.

> 
> If you do it in the wrong way the message is:  "put the && or || at the
> end of the previous line"
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index e3c7fc0..0a813db 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1509,6 +1509,11 @@ sub process {
>  			WARN("please, no space before tabs\n" . $herevet);
>  		}
>  
> +# check for && or || at the start of a line
> +		if ($rawline =~ /^\+\W+(&&|\|\|)/) {
> +			WARN("put the && or || at the end of the previous line\n" . $herecurr);
> +		}
> +
>  # check for spaces at the beginning of a line.
>  # Exceptions:
>  #  1) within comments
> --
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