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Frank Kolmann wrote:
. . . Just a small point, one Fspec will do. Just use a Key length of 99 or so. . . .
My first (and as it turned out, only) experiment was based on Mr. Kolmann's suggestion (because it seemed more idiomatic to RPG, and therefore easier to maintain), and was implemented as follows (only the filenames, were changed to protect the innocent; some spacing was condensed to avoid unwanted line breaks):
FFOO IF F 43 18AIDISK FBAR IF F 43 18AIDISK FBAZ IF F 43 18AIDISK D REC DS D CONTENT 1 43 C CLEAR KEY 18C SETOFF 13
C EVAL KEY = '00010012900001'C KEY CHAIN FOO REC 13
C 13'FOO FAILED!' DSPLY C CONTENT DSPLYC SETOFF 13
C EVAL KEY = '010000001015300001'C KEY CHAIN BAR REC 13
C 13'BAR FAILED!' DSPLY C CONTENT DSPLYC SETOFF 13
C EVAL KEY = '1000000005800001'C KEY CHAIN BAZ REC 13
C 13'BAZ FAILED!' DSPLY C CONTENT DSPLYC SETON LR
The key length was set to the maximum possible key length; the record length was set to the minimum possible record length; the key was specified as a string literal. In no case did a "FAILED" message appear (I used known-good keys for the test); in all 3 cases, the correct first 43 bytes of the record were quite recognizable.
Thanks for ALL of the suggestions; hopefully this thread was educational for a lot of us. It certainly was for me.
-- JHHL
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