Re: [Jython-dev] JavaCC-2.0 on Mac

[<bc...@wo...>]

I once wrote:

>We may have a problem with JavaCC-2.0 on (some?) Macs. Frode Reinsnes
>have tested errata-09 (which uses JavaCC-1.1) and encountered a
>ArrayIndexOutOfBoundsException.
>
>http://www.python.org/pipermail/jpython-interest/2000-October/006356.html

There are now more info available: 

[Frode Reinsnes]

>I have trace the problem lintel more down. The problem is in FillBuff. and
>the problem occure when you try to read one char in the last posison in the
>buffer. That mean theat maxNextCharInd == bufsize-1.
>
>        if ((i = inputStream.read(buffer, maxNextCharInd,
>                                    available - maxNextCharInd)) == -1)
>
>
>A call to inputStream.read(buffer,buffer.length-1,1) will return a larg
>negativ number. This is perhaps a bug in MRJ2.2?

I would say it is a bug in MRJ2.2. It is however a bug that will hurt
jython when used under that version of the JVM.

The return value of Reader.read(b,o,l) is documented as:

"""
   The number of characters read, or -1 if the end of the stream
   has been reached
"""

The inputStream is actually a

  new InputStreamReader(
        new BufferedInputStream(
              new FileInputStream(new File(modname + ".py"))))

I suspect it is the ByteToCharConverter in the InputStreamReader, that
somehow get confused and return a wrong length.

I still have no clue what to do about it.

regards,
finn