return all `unsigned char *' to the user supplied buf.
For the return value it is stated `0x0 = Error: No information available'.
has a return value of unsigned -- a info code of class 0x11xx.
What I want to know is, whether the information that the
former 3 funcs deliver, is OPTIONAL?
At least, this holds true for capi20_get_serial_number();
it is stated in the description, explicitely.
What about the other two's?
(If the info they deliver is not optional then the return value should be a
info code like capi20_get_profile() to make the interface consistent ;)
(P.s.: Need a answer, for a CAPI implementation...)