Re: [PATCH 2/5] lib: rework bitmap_parselist

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Fri, Apr 05, 2019 at 08:32:08PM +0300, Yury Norov wrote:
> Remove __bitmap_parselist helper and split the function to logical
> parts.

> +static const char *bitmap_getnum(const char *str, unsigned int *num)
> +{
> +	unsigned int n = 0, _num = 0;
> +
> +	if (!isdigit(*str))
> +		return ERR_PTR(-EINVAL);
> +
> +	for (; isdigit(*str); str++) {
> +		_num = _num * 10 + (*str - '0');
> +		if (_num < n)
> +			return ERR_PTR(-EOVERFLOW);
> +
> +		n = _num;
> +	}
> +
> +	*num = _num;
> +
> +	return str;
> +}

This looks like (semi) open coded simple_strtoull()

unsigned long long _num;
char *endp;

_num = simple_strtoull(str, &endp, 10);
if (endp == str)
	return ERR_PTR(-EINVAL);
if (_num > UINT_MAX || (endp - str) > 10)
	return ERR_PTR(-EOVERFLOW);
*num = _num;
return endp;

> +static inline bool end_of_str(char c)
> +{
> +	return c == '\0' || c == '\n';
> +}

This reminds me a check at the end of _kstrtoull(). Can we use same approach in
both cases?

-- 
With Best Regards,
Andy Shevchenko