linux-kernel - Re: [PATCH] perf tools: New function to parse string representing size in bytes

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Message-Id: <20091115.171553.84484979.mitake@dcl.info.waseda.ac.jp>
Date:	Sun, 15 Nov 2009 17:15:53 +0900 (JST)
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	mingo@...e.hu
Cc:	fweisbec@...il.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, paulus@...ba.org
Subject: Re: [PATCH] perf tools: New function to parse string representing
 size in bytes

From: Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] perf tools: New function to parse string representing size in bytes
Date: Sun, 15 Nov 2009 09:08:33 +0100

> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > On Sun, Nov 15, 2009 at 12:50:45PM +0900, Hitoshi Mitake wrote:
> > > This patch modifies util/string.[ch] to add new function: bytesexp2int()
> > > to parse string representing size in bytes.
> > > 
> > > Below is the description of bytesexp2int().
> > > 
> > > Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB) (e.g. "256MB")
> > > and return its numeric value. (e.g. 268435456)
> > > 
> > > The parameter str is not changed before and after calling,
> > > but it changed temporally and internally for atoi().
> > > So type of str is char *, not const char *.
> > > 
> > > Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> > > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > Cc: Paul Mackerras <paulus@...ba.org>
> > > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > > ---
> > >  tools/perf/util/string.c |   89 ++++++++++++++++++++++++++++++++++++++++++++++
> > >  tools/perf/util/string.h |    1 +
> > >  2 files changed, 90 insertions(+), 0 deletions(-)
> > > 
> > > diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
> > > index 04743d3..bbedb06 100644
> > > --- a/tools/perf/util/string.c
> > > +++ b/tools/perf/util/string.c
> > > @@ -1,4 +1,5 @@
> > >  #include <string.h>
> > > +#include <stdlib.h>
> > >  #include "string.h"
> > >  
> > >  static int hex(char ch)
> > > @@ -43,3 +44,91 @@ char *strxfrchar(char *s, char from, char to)
> > >  
> > >  	return s;
> > >  }
> > > +
> > > +static int digit(char ch)
> > > +{
> > > +	if ('0' <= ch && ch <= '9')
> > > +		return 1;
> > > +	return 0;
> > > +}
> > 
> > 
> > 
> > We have a "isdigit" macro in util.h already, despite the even already 
> > existing isdigit from the libc. I don't know why we have that. I guess 
> > it comes from git sources but I'm not sure why it has been 
> > reimplemented.
> 
> Git tends to be a lot saner when it comes to keeping library functions 
> sane, so i'd prefer if we kept and used the Git version.

Thanks Frederic and Ingo,
I rewrote the patch according to your advice.
So I'll send the new one in this thread.

   Hitoshi

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