Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!ginosko!uunet!mcsun!ukc!tcdcs!wsl!john
From: john@wsl.UUCP (John Allen on wsl)
Newsgroups: comp.lang.c
Subject: Re: Large arrays in MSDOS
Message-ID: <273@wsl.UUCP>
Date: 27 Oct 89 20:13:13 GMT
References: <4010005@hpcvca.CV.HP.COM>
Reply-To: john@wsl.ie (John Allen on wsl)
Organization: Workhorse Systems, Dublin, Ireland
Lines: 41
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In article <4010005@hpcvca.CV.HP.COM> scott@hpcvca.CV.HP.COM (Scott Linn) writes:
>
>Hello,
>
>I've been having a problem trying to use an array greater than 64k on
>an msdos machine.  What I have is the following:
>
>char foo;
>char FAR *bigbuf;
>.
>.
>.
>bigbug=farmalloc(125000L);
>
>Then, I try to use bigbuf as a linear array:

Try changing you code to something like his:

char ch;
char HUGE *buf;

.
.
.
.
buf = farmalloc(125000L);

buf[some_num] = ch;

................
The HUGE keyword causes pointer arithmetic to become effectively linear.
i.e. Both the segment and offset are modified when subscripting and doing
pointer calculations.

NOTE:- HUGE pointer manipulation is not particularly fast on iApx86 hardware.



-- 

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