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From: cszohagan@qut.edu.au
Newsgroups: comp.lang.c++
Subject: Re: Zortech bugs
Message-ID: <2527@qut.edu.au>
Date: 14 Feb 89 13:11:06 GMT
References: <2118@windy.dsir.govt.nz> <4800049@m.cs.uiuc.edu> <1866@dataio.Data-IO.COM>
Organization: Queensland University of Technology
Lines: 21

In my attempts (as yet uncomplete) to tie in the back end of streams i/o
into a <curses.h> type window, I came accross a bug in Zortech's definition
of <stream.hpp>.  The 2nd constructor for streambuf is missing an initialisation
for the variable "FILE* fp".  This causes problems in the sputc() function
below if performing i/o on a buffer (as opposed to a file pointer).

Useful info if you ever get stuck fiddling with the back end of stream i/o
is that doallocate() allocates 1k chunks of memory and sets the alloc flag to 1.

include/stream.hpp
------------------

< streambuf(char* buf, int buflen) { setbuf(buf,buflen); alloc = 0; }

> streambuf(char* buf, int buflen) {
>	setbuf(buf,buflen); alloc = 0;
>	fp = (FILE *) 0;
> }

	Thanks Walter, I'm enjoying C++,
	Tony O'Hagan