Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!rutgers!ames!ucbcad!ucbvax!decvax!tektronix!tekcrl!tekgvs!toma
From: toma@tekgvs.TEK.COM (Thomas Almy)
Newsgroups: comp.sys.ibm.pc,comp.lang.c
Subject: Re: Assigning to Pointers
Message-ID: <2248@tekgvs.TEK.COM>
Date: Wed, 29-Apr-87 11:52:04 EDT
Article-I.D.: tekgvs.2248
Posted: Wed Apr 29 11:52:04 1987
Date-Received: Sat, 2-May-87 07:36:58 EDT
References: <3537@vrdxhq.UUCP>
Reply-To: toma@tekgvs.UUCP (Thomas Almy)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 28
Xref: mnetor comp.sys.ibm.pc:3648 comp.lang.c:1986

In article <3537@vrdxhq.UUCP> tekgvs!tekcrl!tektronix!uw-beaver!teknowledge-vaxc!sri-unix!husc6!seismo!vrdxhq!tom tom@vrdxhq.UUCP (Tom Welsh) writes:
>
>This may be a dumb question, but could someone please explain
>to me how I assign an absolute address to a pointer to an array?
>...
>I'm using MSC 4.0
>
I thought that this would be general enough to followup rather than reply.

You have to remember that addresses of "far" data structures are longs and
not ints.

For SMALL or MEDIUM memory models (i.e., one data segment), you can say

int far *aa[];	/* aa is a far pointer to an array of ints */

aa = (int far *) 0x50000L;	/* for a fixed address */

#define absAddress(segment,offseg)  (((long)(segment) << 16) + (offseg))

aa = (int far *) absAddress(5,0);	/* for convenience */

For COMPACT or LARGE memory models (i.e., more than one data segment),
just delete the keyword "far" from the preceeding examples.


Tom Almy
(I hate C, but use it twice a day)