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From: "Rod Pemberton" <boo AT fasdfrewar DOT cdm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Detecting the presence of doslfn?
Date: Wed, 10 Jun 2015 06:24:56 -0400
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On Tue, 09 Jun 2015 15:09:20 -0400, Frank Sapone (emoaddict15 AT gmail DOT com)  
<djgpp AT delorie DOT com> wrote:

> Hello DJGGP developers,
>
> I am not quite sure if this is the proper mailing list..  If it's in the  
> wrong place I apologize.
>
> A friend and I have ported Quake 2 to DOS and it works rather well but  
> the one issue is long filenames.  Using doslfn works OK, but I would  
> like to be able to detect the presence of doslfn.  I see theres some lfn  
> functions in the libc but I am unsure if there's just a specific test  
> function for LFN.
>

I posted the function I prefer to use for this here in 2005 ...

You can use the LFN 0x71A0 function to detect the presence of LFN.
I posted the routine for this to comp.os.msdos.djgpp back in 2005:

https://groups.google.com/d/msg/comp.os.msdos.djgpp/BiwXYtw4pjA/8Boz2Bb9K2EJ

If you need it to support OpenWatcom too, then see my 2004 post:

https://groups.google.com/d/msg/openwatcom.users.c_cpp/st05gRWzWfU/XmNxBSv2IaAJ


You can see other DJGPP and OpenWatcom LFN function implementations at  
these links:

rpmunpac w/LFN comp.os.msdos.djgpp 2005
https://groups.google.com/d/msg/comp.os.msdos.djgpp/O8jQn1GbrmU/3Fr5LQbE2gcJ

lfntst.c comp.os.msdos.programmer 2012
https://groups.google.com/d/msg/comp.os.msdos.programmer/u93Wmse0Ypg/mK6ZKKpL7c8J

port of Chris Giese's LBA bios disk routines openwatcom.users.c_cpp 2005
https://groups.google.com/d/msg/openwatcom.users.c_cpp/x9sliO9Y5KQ/vLwJ-3sekpEJ

The latter was on OpenWatcom's website as:
    "Accessing_the_Harddisk_using_LBA_under_DPMI"


Rod Pemberton

-- 
If fewer guns reduced murders, how does one explain
Moscow, Chicago, New York, and South Africa?