function::user_string_quoted - Retrieves and quotes string from user space
the user space address to retrieve the string from
Returns the null terminated C string from a given user space memory address
where any ASCII characters that are not printable are replaced by the
corresponding escape sequence in the returned string. Note that the string
will be surrounded by double quotes. On the rare cases when userspace data is
not accessible at the given address, the address itself is returned as a
string, without double quotes.