🚀 go-pugleaf

I've been trying to get a java program to run on my Mac.  It is a 
microprogramming simulator (for use with "Structured Computer 
Organization" by Andrew Tanenbaum).  The package comes with an assembly 
language assembler and a microprogram assembler.  The problem is that it 
runs perfectly well on Windows and Unix systems, but for some reason, it 
will not work on my Mac.  After much effort and debugging, I have found 
the culprit (the variable 'in' is of type BufferedInputStream):

private String readLine() 
   {
      int ctemp;
      String s = new String();
      try 
      {
            int ch = 0;
            while (((char)ch) != '\n' && ch > -1)
            {
            ch = in.read();
            if (ch == -1 && s.length() == 0) 
            {
                  return null;
            }
            if (ch == '/') 
            {
                  ctemp = in.read();
                  if ((char)ctemp == '/') 
                  {
                     ch = in.read();
 
/***********************************************************************/
                     /* This loop right HERE!
                     while (((char)ch) != '\n' && ch > -1)
                     {
                        ch = in.read();
                     }
/**********************************************************************/
                     lineno++;
                     return s + " ";
                  }
                  else if (ch != 13)
                  {
                     s = s + ((char)ch) + 
Character.toLowerCase((char)ctemp);
                  }
            }
            if (ch != '\n' && ch > -1 && ch != 13) 
            {
                  if ((char)ch == '\'') 
                  {
                     ctemp = in.read();
                     s = s + (char)ch + (char)ctemp;
                  }
                  else
                  {
                     s = s + Character.toLowerCase((char)ch);
                  }
            }
            }
            lineno++;
            return s;
         }
      catch (Exception e) 
      {
         e.printStackTrace();
      }
      return s;
   }

For some reason, this has to do with the Macintosh style line breaks 
because if I resave my files with Unix line breaks everything compiles 
just fine.  But for some reason it will not work on a Macintosh.  Most 
of my test programs start out with a bunch of commented lines (in the 
assembly language comments are delimited with the // marker just like in 
Java or C++).  It works just fine until it reaches the statement 
'ch=in.read()' in the area I marked off.  Then it seems that the read 
method won't return (when I try stepping through the code line by line) 
or just returns -1 which indicates it has reached the end of the stream.  
however, I've inspected the input buffer and see that there are is an 
entire list of valid input data to be read.  Does anyone have any idea 
what could possibly be going on here?  I know it's rather 
complicated--at least it seems to me--but any help on why it works with 
Unix line breaks but not Mac ones would be greatly appreciated.  Thanks!

Mike Tobin