linux-kernel - Re: [PATCH] string: implement streq()

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Message-ID: <c68b346e-107f-4864-b13a-25a25acdb80d@p183>
Date:   Wed, 5 Apr 2023 14:39:33 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] string: implement streq()

On Wed, Apr 05, 2023 at 10:45:36AM +0000, David Laight wrote:
> From: Alexey Dobriyan
> > Sent: 04 April 2023 15:55
> > 
> > On Mon, Apr 03, 2023 at 02:16:41PM -0700, Andrew Morton wrote:
> > > On Sat, 1 Apr 2023 20:48:05 +0300 Alexey Dobriyan <adobriyan@...il.com> wrote:
> > >
> > > > Most of the time strcmp() is being used, strings are checked for equality.
> > > > Add wrapper to relay such intent (it is shorter to type, too).
> > > >
> > > > Use
> > > > 	if (streq(s, "s")) {
> > > > 	}
> > > > or
> > > > 	if (!streq(s, "s")) {
> > > > 	}
> > >
> > > Gee, do we really want this?  I mean, we all know how strcmp() works,
> > > don't we?
> > >
> > > I'm thinking it would be better to remove the various cute little
> > > streq() macros and open-code strcmp(...)==0.
> > 
> > No! It's cool, trust me. Try it out, you'll like it.
> > We "know" how strcmp() works because C didn't have streq() from
> > the very beginning.
> > 
> > strcmp() is only for insertion into trees. Half of the time you need
> > to read to the end of the expression to know if it is check for equality
> > or inequality. With streq(), you don't.
> 
> Instead you have to go away and look up what a function
> you've never heard of does.
> 
> Live with strcmp()...

It is obvious what it does.