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  • Subject: Procedure Problem
  • From: "Wayne Achenbaum" <wache@xxxxxxxxxxx>
  • Date: Thu, 30 Dec 1999 16:10:32 -0500

I have been watching the debate on the correct way to code the centering
procedure. I also can't seem to get it to work the way that I want to. What
I would like to accomplish is, to allow a caller to use the following code.

*--------------------------------------------------------------------*
* Calling Module
*
*--------------------------------------------------------------------*
C                   eval      Ctrfld = $Center(Entryfld)

The problem I am trying to overcome is that I want the calling module to be
oblivious to size and not have to know about defining a varying size
variable to center. I tried all the permeatations that I could conceive of.
My module does not compile with Entryfld defined as 50a.

Can Anyone help with the definition of the field as parameter 1? I tried
Const (*varsize) that didn't work. How can I overcome the parameter type
mismatch if at all. TIA


The Following is a snip from a string utility service Program that works as
long as the parameter is some variable of any size up to and icluding size
256 that is of type varying.

 *--------------------------------------------------------------------*
 * Prototype for $Center procedure
*
 *--------------------------------------------------------------------*
d $Center        PR           256a   varying

d InputData                       256a   Varying Options(*Varsize)

 *--------------------------------------------------------------------*
 * $Center procedure
*
 *--------------------------------------------------------------------*
p $Center        B                    Export
 *
d $Center        PI          256a   Varying
d Field_In                      256a   Varying Options(*Varsize)
*
d Half                s              3s 0
d Len                 s              3s 0
d Size_In           s              3s 0
d Start               s              3s 0
d Field_Out     s            256a
 *
c     ' '           Checkr(E) Field_In      Len
c                   Eval      Size_In = %Len(Field_In)
 *
c                   If        %Found
c                   Eval      Half = %Div(Len:2)
c                   Eval      Start = (((Size_In) /2)
c                                      +1) - Half
c                   eval      %Subst(Field_Out : Start : Len) =
c                             %subst(Field_In : 1 : Len)
c                   Return    Field_Out
 *
c                   Else
 *
c                   Return    Field_In
c                   EndIf
 *
p $Center        E

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