linux-kernel - Re: [PATCH] kconfig: simplification of scripts/extract-ikconfig

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Date:	Mon, 29 Jun 2009 10:51:46 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Dick Streefland <dick@...eefland.net>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: simplification of scripts/extract-ikconfig

On Wed, Jun 24, 2009 at 03:31:48PM +0200, Dick Streefland wrote:
>On Wednesday 2009-06-24 13:46, Dick Streefland wrote:
>| Because I don't want to rely on a particular version of grep, I've
>| modified the script to use perl instead. I hope that's OK. Below is
>| a new patch.
><snip>


Sorry for the delay, I missed this patch...

>
>I found a way to work around the differences in behavior of grep.
>Older versions of grep report the byte offset of the start of the
>line instead of the byte offset of the pattern. By using tr to
>make sure the pattern is always at the start of a "line", both old
>and new versions of grep can be used.


This is very tricky...

<snip>

>+
>+gz1='\037\213\010'
>+gz2='01'
>+cf1='IKCFG_ST\037\213\010'
>+cf2='0123456789'
>+
>+dump_config()
> {
>-	echo "  usage: extract-ikconfig [b]zImage_filename"
>-}
>-
>-clean_up()
>-{
>-	if [ "$TMPFILE" != "" ]; then
>-		rm -f $TMPFILE
>+	if	pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`


Does this work?
My quick test shows no...

I still can't get the right offset number with this trick.

P.S. My grep is 2.5.1.
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