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On a number of systems at various releases have found (for many years)that the starting position used at execution time comes from the file opened, not the F spec. Length of key should match. There are quirks such as the start position plus length of key cannot exceed record length.
jim franz
---- "Peter Dow (ML)" <maillist@xxxxxxxxxxxxxxx> wrote:
Hi Jerry,

Keeping in mind that my grey cells are leaking out and making my hair
grey, but I have this recollection that when IBM started allowing
non-contiguous key fields, the key location in RPG II changed to just 1,
i.e. pretty much unused. I always thought of it as the position of the
key in the index, not in the physical file, and in the index entry, the
key would always start in pos.1.

hth,
*Peter Dow* /
Dow Software Services, Inc.
909 793-9050
pdow@xxxxxxxxxxxxxxx <mailto:pdow@xxxxxxxxxxxxxxx> /

Jerry Adams wrote:
I really don't expect an answer. In fact most people will probably just
delete this when they see the subject line. But this is puzzling the
heck out of me.

I went in to an RPG II program (old package) to do some simple
maintenance changes. I noticed that one of the files was defined as:

FFilenameIPEAFBlenRlenLK1AIOvKlocEDevice+
FLISTCONSIF 27 1AI 1 DISK

Well, the key length is '1' but the key actually starts in position '2'
of the record. The purpose of the file is to validate a code entered on
a panel:

C WRCONS CHAINLISTCONS 54
C 54 SETON 99
C 54 *ZEROS ADD 23 $
C 54 GOTO X2A

The first position of LISTCONS is a status byte. Currently every record
has an 'A' in position 1. The program has been successfully validating
these codes for years. How is that possible? I even put the program
under debug (ISDB) and verified the codes entered (WRCONS) and in the
file (ABCONS) are the same after the chain, and that indicator 54 is
turned *Off.

It has been awhile since I programmed on a S/36, but I'm pretty sure
that, first, when the program started up it would give me a file
mismatch error. Is the i5 really smart enough to say, "Well, he botched
that. Let's just use what is really in the file."?

Thanks.


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