linux-kernel - Re: [PATHCv10 1/2] usb: USB Type-C connector class

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Date:   Wed, 16 Nov 2016 16:31:07 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Oliver Neukum <oneukum@...e.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Bin Gao <bin.gao@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATHCv10 1/2] usb: USB Type-C connector class

On Wed, Nov 16, 2016 at 05:20:24PM +0200, Heikki Krogerus wrote:
> Hi Greg,
> 
> On Mon, Nov 14, 2016 at 10:51:48AM +0100, Greg KH wrote:
> > > +static int sysfs_strmatch(const char * const *array, size_t n, const char *str)
> > > +{
> > > +	const char *item;
> > > +	int index;
> > > +
> > > +	for (index = 0; index < n; index++) {
> > > +		item = array[index];
> > > +		if (!item)
> > > +			break;
> > > +		if (sysfs_streq(item, str))
> > > +			return index;
> > > +	}
> > > +
> > > +	return -EINVAL;
> > > +}
> > 
> > should we make this a core sysfs function?
> 
> Last question before I send v11. Is the following (the helper) OK?
> 
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 26b6f6a..5606810 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -135,6 +135,16 @@ static inline int strtobool(const char *s, bool *res)
>  }
>  
>  int match_string(const char * const *array, size_t n, const char *string);
> +int __sysfs_strmatch(const char * const *array, size_t n, const char *string);
> +
> +/**
> + * sysfs_strmatch - matches given string in an array
> + * @a: array of strings
> + * @s: string to match with
> + *
> + * Helper for __sysfs_strmatch(). Calculates the size of @a automatically.
> + */
> +#define sysfs_strmatch(a, s) __sysfs_strmatch(a, ARRAY_SIZE(a), s)

People will bikeshed the name.  Why not just use sysfs_match_string() as
this does the same as match_string, but calls sysfs_string instead of
strcmp().

thanks,

greg k-h