netdev - Re: [PATCH for 3.8] iproute2: Add "ip netns pids" and "ip netns identify"

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Message-ID: <1358470823.15692.156.camel@deadeye.wl.decadent.org.uk>
Date:	Fri, 18 Jan 2013 01:00:23 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	<netdev@...r.kernel.org>, "Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH for 3.8] iproute2: Add "ip netns pids" and "ip netns
 identify"

On Thu, 2013-01-17 at 16:23 -0800, Eric W. Biederman wrote:
> Ben Hutchings <bhutchings@...arflare.com> writes:
> 
> > On Mon, 2012-11-26 at 17:16 -0600, Eric W. Biederman wrote:
[...]
> >> --- a/ip/ipnetns.c
> >> +++ b/ip/ipnetns.c
[...]
> >> +static int is_pid(const char *str)
> >> +{
> >> +	int ch;
> >> +	for (; (ch = *str); str++) {
> >> +		if (!isdigit(ch))
> >
> > ch must be cast to unsigned char before passing to isdigit().
> 
> isdigit is defined to take an int.  A legacy of the implicit casts in
> the K&R C days.  Casting to unsigned char would be pointless and silly.
[...]

It's not pointless.  This is explained in the very first line of the
description in the manual page...

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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