linux-kernel - Re: [PATCH 1/7] string: introduce helper to get base file name from given path

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Message-ID: <20121002173440.GA26975@kroah.com>
Date:	Tue, 2 Oct 2012 10:34:40 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
	YAMANE Toshiaki <yamanetoshi@...il.com>
Subject: Re: [PATCH 1/7] string: introduce helper to get base file name from
 given path

On Tue, Oct 02, 2012 at 06:00:54PM +0300, Andy Shevchenko wrote:
> There are several places in kernel that use functionality like shell's basename
> function. Let's do it common helper for them.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: YAMANE Toshiaki <yamanetoshi@...il.com>
> ---
>  include/linux/string.h |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index b917881..b09a342 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -147,5 +147,16 @@ static inline bool strstarts(const char *str, const char *prefix)
>  
>  extern size_t memweight(const void *ptr, size_t bytes);
>  
> +/**
> + * kbasename - return the last part of a pathname.
> + *
> + * @path: path to extract the filename from.
> + */
> +static inline const char *kbasename(const char *path)
> +{
> +	const char *tail = strrchr(path, '/');
> +	return tail ? tail + 1 : path;

What happens if '/' is the last thing in the string?  You will then
point to an empty string, which I don't think all callers of this
function is assuming going to work properly (hint, the USB caller will
not...)

thanks,

greg k-h
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