Oppolzer - Informatik / Blog

In our old insurance math system, based on ASSEMBLER, we had lots of read only
tables, which were implemented as load modules like this. The modules that used
this modules, LOADed them and looked up the information in the modules based on
the address in register 0 returned by LOAD.

When implementing the new math system in C, we took a slightly modified approch:
the table modules now had large static const array with init values, and they
contained a small function, which did a binary search on this tables, so the
function delivered the needed values based on keys passed as parameters. The
modules now are "normal" C functions. But from a functional point of view, it is
almost the same.

In a sense, the old approach was smarter, because the binary search had to be
coded only once ... with the new approach, every table module contains the
binary search logic ... but that does no great harm, because the table modules
are generated, and the code is not very large.

Kind regards

Bernd



Am 20.03.2015 um 13:16 schrieb S.F.:
> E.,
>
> Ty my friend, I worked in manufacturing for awhile we had an external table
> like this we loaded into CICS. Those were the days of macro CICS.
>
> Thanks my friend.
>
> Regards,
>
> S.
>
> On Friday, March 20, 2015, E.E. wrote:
>
>> E.E. wrote:
>>
>> I have the same thing which Charles Mills kindly described. Load a mod
>> with data and play with it.
>>
>> In my case, I inherited an ancient IEFUJI exit. That thing loads a module
>> residing in a linklist library which contains only a list of approved
>> accounting codes allowed to be used.
>>
>> As promised here is it (As you can see it was ancient stuff... ;-D ):
>>
>> This load a mod and use R4 as a base to loop the table.
>>
>> A00UJI   EQU   *
>>          LOAD  EP=SSPACTCD
>>          LR    R4,R0                 SAVE EP ADDR
>> A00LOOP  EQU   *
>>          CLC   0(5,R4),PROJECT       IS THERE A MATCH ?
>>          BE    A00SPEC               YES
>>          CLC   0(5,R4),=C'FFFFF'     END OF TABLE
>>          BE    A00INV2               NO
>>          LA    R4,8(,R4)             SCAN THROUGH TABLE
>>          B     A00LOOP               NEXT ENTRY
>> ....
>> A00INV2  EQU   *
>>          WTO   'IEFUJI04 NOT REGISTERED CONTACT SYSTEMS'
>> ...
>>          BAL   R10,A00DELEP
>>          LA    R15,4              4  CANCEL JOB PROCESSING
>>          B     A00EXIT
>> A00SPEC  EQU   *
>>          BAL   R10,A00DELEP        0
>>          LA    R15,0              CONTINIUE
>>          B     A00EXIT
>> A00DELEP EQU   *
>>          DELETE EP=SSPACTCD
>>          BR    R10
>> ...
>> PROJECT  DS     CL5
>>
>> Table linked in Linklib as RENT.
>>
>> SSPACTCD CSECT
>>          DS    0F
>>          DC    CL8'ABCDE'
>> ...
>>          DC    CL8'FFFFF'   END
>>          END
>>
>> Groete / Greetings
>> E.E.
>>
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