linux-kernel - Re: [PATCH] kstrtox: reuse functions from ctype.h

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Date:	Fri, 15 Apr 2011 23:51:48 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kstrtox: reuse functions from ctype.h

On Thu, Apr 14, 2011 at 04:30:17PM +0200, Michal Nazarewicz wrote:
> On Thu, 14 Apr 2011 16:06:34 +0200, Alexey Dobriyan <adobriyan@...il.com>  
> wrote:

> >> @@ -47,8 +42,8 @@ static int _kstrtoull(const char *s, unsigned int  
> >> base, unsigned long long *res)
> >>
> >>                if ('0' <= *s && *s <= '9')
> >>                        val = *s - '0';
> >> -               else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
> >> -                       val = _tolower(*s) - 'a' + 10;
> >> +               else if (isxdigit(*s))
> >
> > [0-9] are isxdigit() as well, so the code sort of logically duplicate.
> 
> Yes, so? ;)
> 
> I think isxdigit(*s) looks nicer than “'a' <= _tolower(*s) &&
> _tolower(*s) <= 'f'”.

If you write isxdigit(*s) you have to write some other expression for
"val = " to be nicer.

The point it's doesn't matter, compiler will optimize all those _tolower().
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