From: Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: LFNs, timeslices and the preprocessor
Date: 22 Oct 2000 11:32:00 -0700
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skb AT xmission DOT com (Scott Brown) writes:

> A few little questions for y'all....
> 
> #1 - Is __dpmi_yield what I want to make my program stop being such a
> pig when running in a Win9x DOS box?  The current incarnation (built
> with BC++ 3.0) is *supposed* to run without being too noticeable, but
> in reality it makes Windows pretty much unusable until it finishes.
> I'm porting it to DJGPP for other reasons, but making it better
> behaved would be a nice bonus.

It should, yes.

> #2 - Is there a reliable way to detect whether long filenames are
> supported?  My program relies on LFNs to function correctly, and could
> do a lot of damage if it thinks it has LFN support when it doesn't.

`_use_lfn'

> #3 - Slightly off-topic portability question.  Reading the CLC FAQ
> suggests that a construct like "#if sizeof(int)" doesn't work (it does
> work in BC, apparently just to annoy people trying to port stuff from
> BC to GCC).  What else would be a good way to test the size of a type
> at compile time (e.g. to make sure that long is exactly 32 bits)?  I
> could check it with sizeof at runtime, but that would be nasty.

GNU programs do it with a configure script, which compiles a small
program which outputs the size, and then adds the value to a header.

<limits.h> has things like INT_MAX, which you can probably use.

-- 

Nate Eldredge
neldredge AT hmc DOT edu