Brainfuck interpreter written in RPG.

The Brainfuck source is embedded in the code.

1:

Dcl-S gCodeInd Int(5);
Dcl-S gCode    Char(128);
Dcl-S gCmd     Char(1);

could be:

Dcl-S gCode    Char(128);
Dcl-S gCodeInd Pointer Inz(%Addr(gCode));
Dcl-S gCmd     Char(1) Based(gCodeInd);

Then there would no need to do a %SUBST every time we change the value of gCodeInd, since gCmd is based off that pointer.

2: gCode could potentially be a pointer in which we just allocate all the instructions too. This is so we don't have a fixed length for the amount of instructions we can have.

3: Read source code from IFS instead of hardcoding