Re: CL parameter problem

On Jun 17, 2021, at 7:00 PM, Leo Burkett <lburkett99@xxxxxxxxx> wrote:

Charles, thanks for your explanation and suggestion.

The problem is that whatever system program that looks at the command before
it gets to the cpp and/or validity check program says that the parameter is
invalid. Maybe it should not look past the terminating x'00'.

Leo
-----Original Message-----
From: MIDRANGE-L On Behalf Of Charles Wilt
Sent: Thursday, June 17, 2021 11:08 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: CL parameter problem

Since you're returning a value, the value is copied back out of the
procedure via the stack.

Thus, the initialized memory space you saw the x'00' inside the RPG
procedure isn't the same memory space that you're seeing in the CL.

Since you're returning a varchar(), it's not really surprising that only the
actual length contains valid data.

Moral of the story, don't look past the current actual length of a
varchar().

Charles


On Thu, Jun 17, 2021 at 8:56 AM Leo Burkett <lburkett99@xxxxxxxxx> wrote:

I have a CL program calling an RPG procedure. The basics are:



DCL &DISTLIST *CHAR 5352

DCL &GRPID C *CHAR 20

DCL &TOTYPE *CHAR 4



.. assign values to &GRPID and &TOTYPE ..



CALLPRC EMLTO PARM((&GRPID *BYVAL) (&TOTYPE *BYVAL)) RTNVAL(&DISTLIST)



&DISTLIST is defined as varying in the RPG procedure, so its length is
data length + 2.



Using debug, I can see that the value in the RPG procedure at the
point of return is filled with trailing x'00'. In the RPG procedure,
I put a 'watch'
on the returned variable, and after the RPG procedure has finished but
before I return to the CL program, I get a message that QUIPUTV has
modified &DISTLIST. The variable now contains garbage where to x'00'
used to be.



I pass &DISTLIST as the 'TO' parameter of the MMAIL command EMLMSG.
The command fails because of an invalid parameter, and never gets to
the EMLMSG cpp.



TIA,



Leo Burkett

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