linux-kernel - Re: [PATCH v5 1/2] mm: add kstrimdup function

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Date:	Thu, 30 Jan 2014 13:44:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Sebastian Capella <sebastian.capella@...aro.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-pm@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, Joe Perches <joe@...ches.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Shaohua Li <shli@...nel.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v5 1/2] mm: add kstrimdup function

On Thu, 30 Jan 2014, Andrew Morton wrote:

> > @@ -63,6 +64,35 @@ char *kstrndup(const char *s, size_t max, gfp_t gfp)
> >  EXPORT_SYMBOL(kstrndup);
> >  
> >  /**
> > + * kstrimdup - Trim and copy a %NUL terminated string.
> > + * @s: the string to trim and duplicate
> > + * @gfp: the GFP mask used in the kmalloc() call when allocating memory
> > + *
> > + * Returns an address, which the caller must kfree, containing
> > + * a duplicate of the passed string with leading and/or trailing
> > + * whitespace (as defined by isspace) removed.
> > + */
> > +char *kstrimdup(const char *s, gfp_t gfp)
> > +{
> > +	char *buf;
> > +	char *begin = skip_spaces(s);
> > +	size_t len = strlen(begin);
> > +
> > +	while (len > 1 && isspace(begin[len - 1]))
> > +		len--;
> 
> That's off-by-one isn't it?  kstrimdup("   ") should return "", not " ".
> 

Yeah, this is an incorrect copy-and-paste of Joe Perches' suggested code 
from http://marc.info/?l=linux-kernel&m=139104508317989.
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