[Info-vax] fixing a saveset's attributes: attachment, not ftp

[Jan-Erik Soderholm]

David Froble skrev den 2015-06-22 18:05:
> Michael Moroney wrote:
>
> Ok, we all know I don't get out much.  I also don't delve into the depts of
> DCL as much as some do.  I'm also aware that the saveset block size is in a
> word integer in bytes 41-42 of the saveset.
>
> But, can someone, speaking slowly and using small words so I can understand
> just what the following is doing?
>
>> $! try to find the blocksize from within the saveset...
>> $ BlockSize = 0
>> $ BBH_L_BLOCKSIZE = %x28*8
>> $ BlockSize = F$Cvui(BBH_L_BLOCKSIZE, 32, Record)
>
> Just curious ....
>
> And yes, I can at least understand initializing BlockSize to zero.

Record contains the first record from the saveset read in
the code before your quote.

 >> $ BBH_L_BLOCKSIZE = %x28*8

28 in hex is 40 decimal, which probably correspond the the "41-42"
range you mentioned. Migth be 1 or 0 start bit difference...

40 (dec) times 8 is the number of *BITS* from the start of record
to the start of the block size parameter. That should be 320.

F$CVUI reads 32 bits from Record starting at bit 320.

The solution to this was "help lex f$cvui". That made it clear
what the rest did... :-) Did you look up that?

Jan-Erik.