Re: [PATCH net-next 3/4] hwmon: Add helper to tell if a char is invalid in a name

[Guenter Roeck <linux@roeck-us.net>]

On Tue, Jul 17, 2018 at 09:48:12PM +0200, Andrew Lunn wrote:
> HWMON device names are not allowed to contain "-* \t\n". Add a helper
> which will return true if passed an invalid character. It can be used
> to massage a string into a hwmon compatible name by replacing invalid
> characters with '_'.
> 
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  include/linux/hwmon.h | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
> index b217101ca76e..9493d4a388db 100644
> --- a/include/linux/hwmon.h
> +++ b/include/linux/hwmon.h
> @@ -398,4 +398,27 @@ devm_hwmon_device_register_with_info(struct device *dev,
>  void hwmon_device_unregister(struct device *dev);
>  void devm_hwmon_device_unregister(struct device *dev);
>  
> +/**
> + * hwmon_is_bad_char - Is the char invalid in a hwmon name
> + * @ch: the char to be considered
> + *
> + * hwmon_is_bad_char() can be used to determine if the given character
> + * may not be used in a hwmon name.
> + *
> + * Returns true if the char is invalid, false otherwise.
> + */
> +static inline bool hwmon_is_bad_char(const char ch)
> +{
> +	switch (ch) {
> +	case '-':
> +	case '*':
> +	case ' ':
> +	case '\t':
> +	case '\n':
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
>  #endif
> -- 
> 2.18.0
>