----- Original Message -----
From: myke predko <myke@PASSPORT.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, October 23, 2002 5:17 PM
Subject: Re: [PIC]: String macro parameters


> Olin,
>
> From your original reply, it sounded like you knew of a way to parse a
> string and pass individual characters to specific statements in the format
> that was originally asked:
>
>
> > > >         TEXT "Hello"
> > > > and have it expand to:
> > > >         sublw 'H'
> > > >         sublw 'e'
> > > >         sublw 'l'
> > > >         sublw 'l'
> > > >         sublw 'o'
> > > > <<
> > > >
> > > > This can be done.
>
> A macro that can convert a parameter string to a DT statement is pretty
> simple - I (and the original poster) was hoping for something a bit more
> arbitrary.
>
> Thanx anyway,
>
> myke

Depends on the assembler, in xcasm you could write

Unoptimised

        foo       .macro    arg

        xlen      .set        STRLEN(arg)
        indx      .set        0

                    .while     indx < xlen
                    sublw     INT(SUBSTR(arg, indx, 1))
        indx     .set         indx + 1
                   .done

                   .endm

Optimised

        foo       .macro    arg

        xlen      .set        STRLEN(arg)
        indx      .set        0
        xacc     .set        0

                    .while     indx < xlen
        xacc     .set        xacc + INT(SUBSTR(arg, indx, 1))
        indx     .set         indx + 1
                   .done

                    sublw     xacc & $ff

                   .endm

Regards
Sergio Masci

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