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From: Gale Paeper
Subject: Internal compiler error with readstring
Date: 24 Jan 2006, 06:41:23

Waldek Hebisch wrote:
> 
> Adriaan van Os wrote:
> > Peter Schorn wrote:
> >
> > > The following program crashes the compiler (gpc345u2 on Mac OS 10.4.4):
> > >
> > >
> > > program rs;
> > >
> > > { compile with gpc rs.pas }
> > >
> > > var a: integer;
> > >
> > > begin
> > >     readstring(a);  { internal compiler error: Bus error }
> > > end.
> >
> > Hmm, I think I caused this error, by adding ReadString to predef.def
> >
[snip]
> 
> Is it just a single routine ("ReadString") or does Mac Pascal have also
> "WriteString"?

Mac Pascal has function that is basicly a functional form of
"WriteString".  The function's name is "StringOf" and it returns a
string-type. So the difference between the two is the method used to
pass back to the caller the written to string.  "WriteString" uses a
required string-variable first parameter; whereas, doesn't use a
required string-variable first parameter.  Using ISO 10206 syntax
notation, a syntax comparison would be:

ISO 10206: writestr(s, p1, ... , pn)
versus
Mac Pascal: s := stringof(p1, ... , pn)

I'll note that Mac Pascal's have a few extensions in the types of
parameters allowed for Read and ReadString and THINK Pascal allows more
types for  Write and StringOf.  All three traditional Mac Pascal
compilers allow boolean type parameters for Read and ReadString which
ISO doesn't allow.  THINK Pascal extends allowed types to include any
enumerated type for reading as well as writting. But to make that work
reasonably well, THINK Pascal doesn't do field width truncation on the
strings written out for boolean or enumerated types and thus avoids
having to handle reading write truncated strings for those types.

Gale Paeper
gpaeper@empirenet.com

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