linux-kernel - Re: [PATCH v3] perf tools: New function to parse string representing size in bytes

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Message-Id: <20091115.195711.77834168.mitake@dcl.info.waseda.ac.jp>
Date:	Sun, 15 Nov 2009 19:57:11 +0900 (JST)
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, fweisbec@...il.com
Subject: Re: [PATCH v3] perf tools: New function to parse string
 representing size in bytes

From: Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v3] perf tools: New function to parse string representing size in bytes
Date: Sun, 15 Nov 2009 11:28:59 +0100

> 
> * Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:
> 
> > + * bytesexp2int()
> 
> i suspect this could be named 'bytestring2ll' ? Is 'bytesexp' an 
> existing naming in other libraries?

Sorry, I've forgot to rename.
And bytesexp may not exist in other libraries.
I couldn't create nice name for the notion number + unit in byes.

> 
> > + * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
> > + * and return its numeric value
> > + */
> > +long long int bytesexp2int(const char *str)
> 
> we have type shortcuts for 'long long': s64.
Thanks, I use s64. This is easy to type.

> 
> > +{
> > +	unsigned int i;
> > +	long long int length = -1, unit = 1;
> 
> s64 too i suspect.
> 
> > +tera:
> > +			unit = (long long int)K * K * K * K;
> 
> Note, you can probably avoid this type cast if you define the 'K' 
> literal as 1024LL or so.
I've forgot this notation, thanks.

> 
> > +	length = atoll(str) * unit;
> 
> we might want to take a naming clue here and name this new function as 
> atoll_exp(), to signal that it works like atoll, just with an extension 
> for KB/MB/GB/etc. expressions?

Hm, how about "atoll_byteunit()"?
This may have no ambiguity.
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