Re: MOVEA -> EVAL

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

Ummm... I'm fairly fluent in pointers and pointer use, but if I saw that
code in a program I would wonder what the programmer was smoking that day.

It would also take me 15 minutes or so to figure out just what the program
was doing.  Is there an easier format to code this in that is more intuitive?

Regards,

Jim Langston

Me transmitte sursum, Caledoni!

bmorris@ca.ibm.com wrote:
> 
<SNIP> 
> 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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