Re: Prototyping printf()

["Peter Dow" <pcdow@xxxxxxxxxxxxxxx>]

Hi Ken,

The V4R4 RPG ILE manual says:
---
If you are aligning fields manually, make sure that they are aligned on the
same boundaries. A start-position is on an n-byte boundary if ((position -
1)mod n) = 0. (The value of "x mod y" is the remainder after dividing x by y
in integer arithmetic. It is the same as the MVR value after X DIV Y.)

 [diagram omitted]

Note the following about the above byte sequence:

Position 1 is on a 16-byte boundary, since ((1-1) mod 16) = 0.
Position 13 is on a 4-byte boundary, since ((13-1) mod 4) = 0.
Position 7 is not on a 4-byte boundary, since ((7-1) mod 4) = 2.
---

The position they're talking about is the position of the subfield within a
data structure, so if the above is true, one would have to assume that the
data structure begins on a 16-byte boundary. It would be nice if they
explicitly said that, and assured us it won't change from release to
release.

Regards,
Peter Dow
Dow Software Services, Inc.
909 425-0194 voice
909 425-0196 fax


From: "Sims, Ken" <KSIMS@SOUTHERNWINE.com>
> The ALIGN keyword insures that float, signed, and unsigned integers are
> aligned on the appropriate boundaries (2-byte, 4-byte, and 8-byte) for the
> best performance.  This is not going to insure that a 16-byte CHARACTER
> field being used for a pointer is aligned on a 16-byte boundary.


> +---
> | This is the RPG/400 Mailing List!
> | To submit a new message, send your mail to RPG400-L@midrange.com.
> | To subscribe to this list send email to RPG400-L-SUB@midrange.com.
> | To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
> | Questions should be directed to the list owner/operator:
david@midrange.com
> +---

+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---