linux-kernel - RE: [linux-pm] [PATCH] ACPI: replace strlen("string") with sizeof("string") -1

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Date:	Wed, 8 Aug 2012 00:59:24 +0000
From:	Daniel Taylor <Daniel.Taylor@....com>
To:	'Bernd Petrovitsch' <bernd@...rovitsch.priv.at>
CC:	'Alan Stern' <stern@...land.harvard.edu>,
	Pavel Vasilyev <pavel@...linux.ru>,
	Pavel Machek <pavel@....cz>, Len Brown <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>
Subject: RE: [linux-pm] [PATCH] ACPI: replace strlen("string") with
 sizeof("string") -1

Said it was a silly question.

It's funny.

I've been using "0123456789abcdef"[index] for a long time, so I "know"
that "string" is a array of char, but it never occurred to me that
"string" would work in sizeof() the same way as

char string[] = { '0', '1', '2', '3', '4', '5', '6', '7',
                  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', '\0' };

int stringlength = sizeof(string);

Learned something.

Thanks,

Dan
 

> -----Original Message-----
> From: Bernd Petrovitsch [mailto:bernd@...rovitsch.priv.at] 
> Sent: Tuesday, August 07, 2012 6:20 AM
> To: Daniel Taylor
> Cc: 'Alan Stern'; Pavel Vasilyev; Pavel Machek; Len Brown; 
> linux-acpi@...r.kernel.org; 
> linux-pm@...ts.linux-foundation.org; 
> linux-kernel@...r.kernel.org; Len Brown
> Subject: RE: [linux-pm] [PATCH] ACPI: replace 
> strlen("string") with sizeof("string") -1
> 
> On Mon, 2012-08-06 at 22:57 +0000, Daniel Taylor wrote:
> > Silly question:  when did sizeof("string") get changed to 
> be anything
> > other than the size of the pointer ("string" is, after all, an array
> > of characters)? 
> 
> It is since K&R times that way.
> If you do not know the difference between a pointer and an array (and
> these are vastly different), go learn something new about C.
> 
> 	Bernd
> -- 
> Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
>                      LUGA : http://www.luga.at
> 
> --
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