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  2. MIDRANGE-L
  3. January 2018

Checking for missing parameters in CL

Folks:

I just discovered this and thought I would share ... not sure if it's already been discussed or if it's common knowledge. :)

I have a CL Bound program that I wanted to have an optional parameter.

I know I could create a command for the CL and the default for a unspecified parameter would, but this wasn't warranted for the particular change I was making.

I know, in RPG, you can specify *OMIT on parameters that have the OPTION(*OMIT) modifier ... and you check to see if the address of the parameter is null.

So I tried something similar in CL...

pgm (&parm1)

dcl &parm1 *char (10)

dcl &p1addr *ptr

chgvar &p1addr (%address(&parm1))

if (&p1addr = *null) then(do)
/* do something if parameter wasn't specified */
enddo
else do
/* do something else if the parameter was specified */
endpgm

So far it seems to work as I expect.

david


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