RE: Byte Alignment question with Change User Space Attributes API(QUSCUSAT)

You can't really align a DS subfield, 
Use the ALIGN keyword on the DS itself, but I think RPG aligns DS's anyway
so it shouldn't be an issue for you.
-Bob


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Wilt, Charles
Sent: Friday, February 04, 2005 10:04 AM
To: RPG Programming Mailing List (E-mail)
Subject: Byte Alignment question with Change User Space Attributes
API(QUSCUSAT)

In the docs for the  Change User Space Attributes API (QUSCUSAT) is the
following:

"Each variable length record must be 4-byte aligned. If not, unpredictable
results may occur."

also this:

"If you specify a length of data that is longer than the key field's defined
data length, the data will be truncated at the right. No error message will
be returned."

Now for example, the Initial value key has a data field that is only 1 byte
long.  Does this mean that you should add 3 bytes of filler so that the next
key is on a 4 byte boundary?

example ds

     d t_InitialValueAttr...
     d                 ds                  qualified
     d  key                          10I 0 inz(2)
     d  dataLength                   10I 0 inz(%sizeof(data))
     d  data
     d   initialValue                 1a   overlay( data : *NEXT )
     d                                3a   overlay( data : *NEXT )


Thanks,


Charles Wilt
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121
 

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