kstrtoull - convert a string to an unsigned long long
kstrtoull(const char * s,
unsigned int base,
unsigned long long * res);
The start of the string. The string must be
null-terminated, and may also include a single newline before its terminating
null. The first character may also be a plus sign, but not a minus sign.
The number base to use. The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected
with the conventional semantics - If it begins with 0x the number will be
parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it
will be parsed as an octal number. Otherwise it will be parsed as a
Where to write the result of the conversion on
Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing
error. Used as a replacement for the obsolete simple_strtoull. Return code
must be checked.