Re: C to RPG

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

Œ
Hello Robert,

You wrote:
>Can somebody help me define a prototype  definition to call the following C
>API via RPG.   I have tried  various different methods for the protype
>field types and I can't get to to work.

Showing us the C prototype for this function would be much more useful than
showing the code.  However, here is my best guess based on the information
at hand.  The C data type 'long' is a 4-byte signed integer (generally, and
on the AS/400 specifically) thus maps to RPG IVs 10-digit integer data type.
Everything else in this program is just a fixed-length character string
(implemented as arrays because C doesn't know what a fixed length character
field is) and arrays are passed by reference (Well, really the array name is
just a pointer and that is passed by value but it amounts to the same
thing). The only awkward thing is the 2 dimensional array for 'rule_array'
but we can presume that it is simply a 4*8 matrix implemented linearly in
storage thus equivalent to a char(32).  It would map quite happily to an
array in a multiple occurrence data structure.

DName+++++++++++ETDsFrom+++To/L+++IDc.Keywords+++++++++++++++++++++++++++++
d CSNBKTB         PR
d  rt_cod                       10I 0
d  rs_cod                       10I 0
d  exit_data_len...
d                               10I 0
d  exit_data                     4
d  key_token                    64
d  key_type                      8
d  rule_array_count...
d                               10I 0
d  rule_array                   32
d  key_value                    16
d  mkvno                        10I 0
d  key_register_no...
d                               10I 0
d  secure_token                  8
d  control_vector               16
d  init_vector                   8
d  pad_char                     10I 0
d  crypto_period_st...
d                                4
d  crypto_period_en...
d                                4

There is also a remote chance you may need to null-terminate some of the
character strings.

NOTE: For those of you confused by why there are no pointers in my
prototype, remember: passing a pointer by value is the same as passing a
variable by reference.

If that prototype doesn't work then check that the parameter order is
correct.  I think it is right but there is a possibility I made a mistake (I
thought I was wrong once but it turned out I was mistaken). For complete
accuracy I would want to see either:

        The C prototype for CSNBKTB
or
        The entry point source for CSNBKTB


Regards,
Simon Coulter.

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