Re: Reading Pipe - ASCII -> EBCDIC Conversion -- RPG400-L

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Rory Hewitt wrote:

As I understand it, if the variable passed has the same length/type as the
parameter definition, the address of the variable is passed directly; if it
has a different type or length, it's copied into a temporary variable, whose
address is passed to the procedure.

That's correct. Well, almost. For fixed-length string parameters (A,C,G), the address of the variable is also passed if the parameter is longer. And OPTIONS(*VARSIZE) can cause the address of the variable to be passed even if the parameter has a shorter length.

In the second case, I assume that if the called procedure *were* to
change the parameter, since it would only affect the temporary variable, it
wouldn't be a problem, whereas in the first case, it *could* affect the
variable in the calling program. Is this correct?

Yes, that's correct.

A low-level question then: In the second case (using a temporary variable),
is the storage for that variable freed immediately after the procedure has
returned control or what?

Yes. The temporary could be reused for something else after the procedure has returned control.

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