Analyzing the report field on IBM® i

The MDREP field contains subfields. Because of this, some applications need to check whether the sender of the message requested a particular report. Those applications should use the technique described in this topic.


Use arithmetic

The following steps should be performed using integer arithmetic:
  1. Select one of the following values, according to the type of report to be checked:

    • ROCOA for COA report
    • ROCOD for COD report
    • ROEXC for exception report
    • ROEXP for expiration report
    Call the value A.
  2. Divide the MDREP field by A ; call the result B.
  3. Divide B by 8 ; call the result C.
  4. Multiply C by 8 and subtract from B ; call the result D.
  5. Multiply D by A ; call the result E.
  6. Test E for equality with each of the values that is possible for that type of report. For example, if A is ROEXC, test E for equality with each of the following to determine what was specified by the sender of the message:

    • RONONE
    • ROEXC
    • ROEXCD
    • ROEXCF
    The tests can be performed in whatever order is most convenient for the application logic.
The following pseudocode illustrates this technique for exception report messages: 
A = ROEXC
B = Report/A
C = B/8
D = B - C*8
E = D*A

A similar method can be used to test for the ROPMI or ROPCI options; select as the value A whichever of these two constants is appropriate, and then proceed as described previously, but replacing the value 8 in the previous steps by the value 2.