linux-kernel - Re: [PATCH] linux/string.h: Introduce streq macro.

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Message-ID: <1303924079.18763.70.camel@gandalf.stny.rr.com>
Date:	Wed, 27 Apr 2011 13:07:59 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Thiago Farina <tfransosi@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] linux/string.h: Introduce streq macro.

On Wed, 2011-04-27 at 17:46 +0100, Al Viro wrote:
> On Tue, Apr 26, 2011 at 03:49:49PM -0300, Thiago Farina wrote:
> > This macro is arguably more readable than its variants:
> > - !strcmp(a, b)
> > - strcmp(a, b) == 0
> 
> Strongly NACKed.  As far as I'm concerned, it's in the same shitbucket as
> bcopy(3), bzero(3) et.al.  Use idiomatic C; extensions of that kind are
> *bad*, since new developers have to learn them.

What developer has to really learn streq()? I mean it is pretty obvious
to what it does, as suppose to what bzero and bcopy do. A quick google
on "streq" brings up lots of matches of people who already do this.

Actually, some have "optimized" it with:

#define streq(a, b) (*(a) == *(b) && strcmp(a, b) == 0)

As it fails out if the first character does not match (likely the case
if strings do not match) before it calls the strcmp function.

-- Steve

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