linux-kernel - Re: [PATCH 1/2] kstrto*: add documentation

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Date:	Thu, 12 Jul 2012 18:16:22 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Eldad Zack <eldad@...refinery.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kstrto*: add documentation

On Fri, Jul 13, 2012 at 12:09:37AM +0200, Eldad Zack wrote:
> 
> On Thu, 12 Jul 2012, J. Bruce Fields wrote:
> > On Thu, Jul 12, 2012 at 10:53:13PM +0200, Eldad Zack wrote:
> > > +/**
> > > + * kstrtoul - convert a string to an unsigned long
> > 
> > Also, is it worth mentioning that the number is required to be followed
> > by a string or newline?
> 
> I am not sure if I understand _parse_integer correctly (which is called 
> to do the actual parsing and has a very nice comment to it) - but it 
> expects a null-terminated string, but will also stop as soon as it 
> bumps into any other non-number character without error (please correct 
> me I'm wrong).

I believe it, but, in _kstrtoull:

	rv = _parse_integer(s, base, &_res);
        if (rv & KSTRTOX_OVERFLOW)
                return -ERANGE;
        rv &= ~KSTRTOX_OVERFLOW;
        if (rv == 0)
                return -EINVAL;
        s += rv;
        if (*s == '\n')
                s++;
        if (*s)
                return -EINVAL;

So actually it appears the string must be all numeric except possibly a final
newline.

--b.
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