From: lonniem AT nol DOT net
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Memory management in DJGPP
Date: Sat, 04 Jan 1997 08:01:07 GMT
Organization: Networks On-Line
Lines: 56
Message-ID: <5akrpc$297$1@news.nol.net>
References: <5ahrj3$crt$1 AT news DOT utdallas DOT edu>
NNTP-Posting-Host: ip39-14.nol.net
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

rbrooks AT utdallas DOT edu (Rusty L Brooks) wrote:

>I have a few questions about djgpp... since I am learning C++ from a
>different C++ book, there is some difficulty...

>First of all, gcc doesn't seem to handle the keyword far, as in:
>char far *harf;

>This was mentioned in the info libc.a help files...  How can I maintain a
>similar functionality?

>Secondly, if I want to pass a memory value to a pointer, how do I go about
>doing this?  (Both for far pointers and near pointer)  I get a warning
>about casting harf (see above) to an int without a cast if I try something
>like:

>char *harf = 0x0013 or something similar.

>Email replies appreciated, but I *do* read the group, so posting here is
>ok too.
Well for your casting woes try some code like this:

char *harf = (char *) 0x0013;

But I don't think this is what you want.  This sets the ptr to point
to the address 0x0013 and does not make that the value being pointed
to.  Try this:

char *harf = malloc (1);  

*harf = 0x13;

If this is not what you want well then I don't know what you do want.
This sets the value being pointed to to 0x13.

Also if you want to copy some code straight from a book that uses
far/near pointers do this:

#define far
#define near

This will take away the error messages but is not very good code.  You
don't need he whole far/near thing.  It's was a kludge built into
16-bit code at a time when 64KB for code and 64KB for data was
considered forward thinking.  So just change this:

char far* ptr;  /* I've forgotten how to use the far keyword, 
                         Is this correct? */

into

char* ptr;

Lonnie McCullough
lonniem AT mail DOT utexas DOT edu