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In article <87kn3yb.westes@netcom.com> westes@netcom.com (Will Estes) writes:
>Using the MS-DOS version of diff 1.15, I occasionally get an error
>message reporting that memory has been exhausted (this on a machine that
>has 15 megs of extended memory).  Do other users of the
>MS-DOS version get the same error?  Can someone point me to an ftp site
>for a version of diff that has been made to work with VCPI, DPMI, or EMS
>under MS-DOS?

This tells us nothing about which specific version of diff you are using.
Who is it from? Who compiled it? Which compiler? etc.

Anyway, get the DIFF that comes with DJGPP.  It seems to have no memory limits.

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In article <87kn3yb.westes@netcom.com> westes@netcom.com (Will Estes) writes:
>From: westes@netcom.com (Will Estes)
>Subject: MS-DOS Version of diff Exhausts Memory
>Date: 3 Sep 92 00:07:36 GMT

>Using the MS-DOS version of diff 1.15, I occasionally get an error
>message reporting that memory has been exhausted (this on a machine that
>has 15 megs of extended memory).  Do other users of the
>MS-DOS version get the same error?  Can someone point me to an ftp site
>for a version of diff that has been made to work with VCPI, DPMI, or EMS
>under MS-DOS?

The djgpp directory on the simtel mirrors:
Directory PD1:<MSDOS.DJGPP>
 Filename   Type Length   Date    Description
==============================================
DJDEV108.ZIP  B  778559  920820  Minimum development environment (djgpp)
contains (among much other stuff) a version of diff.
It's also available from its original source:
barnacle.erc.clarkson.edu
in directory:
ftp/pub/msdos/djgpp

Michael Sanders                                Internet: t.m.sanders@umich.edu
Physics Department                             Bitnet: sanders@umiphys
University of Michigan                         Telephone: (313)936-0799
Ann Arbor, MI 48109-1120                       FAX: (313)763-9694

In <1992Sep3.155835.10175@midway.uchicago.edu> pynq@midway.uchicago.edu (George Jetson) writes:
>In article <87kn3yb.westes@netcom.com> westes@netcom.com (Will Estes) writes:
>>Using the MS-DOS version of diff 1.15, I occasionally get an error
>>message reporting that memory has been exhausted (this on a machine that
>>has 15 megs of extended memory).  Do other users of the
>>MS-DOS version get the same error?  Can someone point me to an ftp site

>This tells us nothing about which specific version of diff you are using.
>Who is it from? Who compiled it? Which compiler? etc.

I'd guess GNU diff-1.15 and he compiled it himself.

Anyway, I noted a similar problem when I was forced to port GNU
egrep to MS-DOS.  I don't have the sources or my diffs on-line
so this is a touch vague.  The basic problem was that once the
initial small (16k?) buffer was outgrown, a call to realloc is
made with size set by (1 << 16) which is 64k, but guess what
happens on MS-DOS with its 16bit int's?  Yep, realloc is called
with a size of 0, causing everyone to think that there is no
memory left.

I can't recall whether I made it (1 << 15) or ((1 << 16) - 1)
(if being compiled on MSDOS) anyway that made the problem
dissappear.

Look for calls to {m,re,xm,xre}alloc and check the sizes being
used keeping in mind that you only have 16bits.

-- 
Simon J. Gerraty        <sjg@zen.void.oz.au>

#include <disclaimer>   /* imagine something _very_ witty here */