Re: MOVEA -> EVAL

[bmorris@xxxxxxxxxx]

>Date: Mon, 04 Jun 2001 14:17:08 -0400
>From: "M. Lazarus" <mlazarus@ttec.com>
>
>  I was wondering about an item that you published in MC, May 2001 issue,
>p78, entitled V5R1 Enhancements to RPG IV.  In Figure 2 it states the
>opcode and suggested freeform replacement.
>
>  Next to MOVEA is says EVAL.  Has EVAL been enhanced to substitute MOVEA
>functionality?

Mark, EVAL doesn't specifically duplicate the function of MOVEA, but with
a couple of based character fields, you can copy data any way you like.

Formerly, MOVEA was the only way to do string processing in RPG, and now
I think it's often used out of habit where newer string builtin functions
can handle the same task without bothering with arrays at all.

Anyway, to handle the function of MOVEA using EVAL:

C        MOVEA      arr1(n)     arr2(m)
C        MOVEA(P)   arr1(n)     arr2(m)

becomes

D src       s         65535a   based(pSrc)
D tgt       s         65535a   based(pTgt)
D srcLen    s            10i 0
D tgtLen    s            10i 0
 /free
        pSrc = %addr(arr1) + %size(arr1) * (n - 1)
        pTgt = %addr(arr2) + %size(arr2) * (m - 1)
        srcLen = %size(arr1) * (%elem(arr1) - n + 1)
        %subst(tgt : 1 : srcLen) = %subst(src : 1 : srcLen) // no padding

        tgtLen = %size(arr1) * (%elem(arr1) - n + 1)
        %subst(tgt : 1 : tgtLen) = %subst(tgt : 1 : srcLen) // padding

Barbara Morris

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