RE: Chain doesn't set %EOF

Oddly enough chain partially supports %eof.  Seems to me that %eof and
%found were designed to emulate the behavior of the file op indicators
which leads to results that aren't intuitive to everyone.  Here's an
excerpt from the v5r2 RPG Reference:

The following operations, if successful, set %EOF(filename) off. If the
operation is not successful, %EOF(filename) is not changed. %EOF with no
parameter is not changed by these operations.

    * CHAIN (Random Retrieval from a File)
    * OPEN (Open File for Processing)
    * SETGT (Set Greater Than)
    * SETLL (Set Lower Limit)



-----Original Message-----
From: rpg400-l-bounces+jfritz=sharperimage.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+jfritz=sharperimage.com@xxxxxxxxxxxx] On Behalf
Of Paul Morgan
Sent: Tuesday, March 29, 2005 9:20 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: Chain doesn't set %EOF

A new %DATA BIF would work but why add a new BIF that isn't really
needed?

The same %EOF vs %FOUND argument could be made about a ReadE.  When I do
a ReadE and it sets on %EOF it's not really at End Of File but at the
end of the read group.  As far as I'm concerned a Chain opcode is really
just a shortcut opcode for a SetLL/ReadE combo.  It should function the
same way.
I'd also mention the %EQUAL BIF set by the SELL opcode isn't set by the
CHAIN opcode.

Paul

--
Paul Morgan
Senior Programmer Analyst - Retail
J. Jill Group
100 Birch Pond Drive, PO Box 2009
Tilton, NH 03276-2009
Phone: (603) 266-2117
Fax:   (603) 266-2333

"Joe Pluta" wrote

> Hi Paul!
>
> The thinking is that you didn't actually hit end of file.  Only a READ

> can hit the end of file; CHAIN can only either find or not find a
> record.  Yeah, it's a pain in the butt because it blows up the
> shortcut that many of us have used for 20 years or so.
>
> I understand the thinking that %EOF and %FOUND are different.  How
> about a new BIF that does what we want?  Like %DATA.  If a CHAIN *or*
> a READ are successful in putting data into the buffer, then %DATA is
> true.  We could then do this:
>
> Chain ( SomeKey ) File;
> DoW %Data( File );
>    // do something
>    ReadE ( SomeKey ) File;
> EndDo;
>
> Joe



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