I've got a question for the group-at-large, which I hope
will be obvious to someone deeply in-the-know.
I've got a program that opens a VB PDS (RECFM=VB,BLKSIZE=2550,LRECL=255).
But - note that I said it opens the PDS, not a member of the PDS. That
open succeeds, and presumably, the program will merrily try to
read the PDS directory as Format-V records.
So - the first read succeeds, and it gets these bytes back for
the first 6:
000EFFFF FFFF
| BDW | | RDW ....
The BDW indicates a block-len of 14, but the 'reserved' bytes are not 00.
The RDW then indicates a record length of 65535 - which is preposterous
given that the BDW said the entire block-len was only 14.
And - of course, trying to read 65531 bytes for the remaining record
doesn't work, because they aren't there. The 14 isn't there either.
OK - admittedly - walking thru the directory entries and trying
to interpret that as VB isn't the best thing in the world... but,
what's a program "to do" with what the user types.
Should it look at the lrecl/blksize in the DCB and decide that
this doesn't make sense? What if it did make sense - then what?
Or - is there a way to know this is a bunch of bytes from a
PDS directory... and this READ doesn't make sense?
- Many thanks! -
- Dave Rivers -
--
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