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32-bit MSDOS (Announce)

posted by kerravon E-mail, Ligao, Free World North, 04.07.2021, 02:00

> > > I agree with mceric here. You risk having to rewrite minimize programs
> > to
> > > suit the minimal C functionality, reducing the compiler to some basic
> C
> > > equivalent syntax and libraries only.
> >
> > Does ISO Pascal, standardized in 1990, same
> > time as C90, have more functionality than
> > it's C counterpart?
>
> Pascal dialects are complex, and most used dialects do not confirm to
> standards. First, the most common dialect family, the Borland derived
> dialects are not ISO compliant. They derive from a pre standard bootstrap
> subset used for the important UCSD dialect. (the one that popularized
> bytecode)
>
> Second there are three important standards. The 1983 Standard Pascal
> standard (ISO 7185) which has two levels, level zero and one. The
> difference is afaik most conformant arrays and schemata, things that are
> strangely modern (Safe constructs for static procedural programming, has
> echoes in Ada,Rust,Go syntax)
>
> And the 1990 Extended Pascal standard. (Iso 10206:1990)
>
> I'd say Standard Pascal is a bit larger than standard C, and less keen on
> not having constructs that require runtime support, but because it doesn't
> assume a linear memory model, it does not allow things like pointer
> arithmetic. Think of pointers like handles only. You can malloc and free
> them, but not manipulate them. So it is not a complete superset.
>
> The level 1 extensions allow to define data types with variable sized
> arrays inside (e.g. for static char[] in structs), and for those variant
> parts (so called discriminants) to be only chosen at a new() call (a typed
> malloc call, like new in C++)
>
> Extended Pascal adds modular programming.
>
> Free Pascal however was not standard compliant and supported the much more
> popular Borland dialects (Turbo Pascal, Delphi). The latter in particular
> includes everything and the kitchen sink.
Surely Free Pascal supports a superset of
level 0 of Pascal 83?

If not, maybe I will restrict my Pascal
programs to the common subset of Pascal83-0
and FPC.

I would hope that my existing worldpas.pas
complies to the common subset.

BFN. Paul.

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