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

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Date:	Tue, 2 Oct 2012 20:52:05 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	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 2, 2012 at 8:34 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> 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 for pointing to that. I think it's a usb specific case, so, I
assume your comment related to that patch.


-- 
With Best Regards,
Andy Shevchenko
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