From: "Wojciech Galazka" <wojciech DOT galazka AT polkomtel DOT com DOT pl>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: how does DJGPP check for LFN support?
Date: Wed, 28 Jun 2000 18:02:15 +0200
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To: djgpp AT delorie DOT com
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Jeff Williams wrote in <200006261645 DOT LAA25509 AT darwin DOT sfbr DOT org>...
>
>I'm asking because I'm mucking about with an asm-level LFN TSR for a
>pure DOS 5.0 + djgpp environment.  I thought I would implement all the
>TSR infrastructure first, and just reflect any INT 21/AX=0x71xx calls
>back to their SFN equivalents.  Later I'll start adding the LFN support.
>


The source code of lfndos  (in C) has been released so you can try to start
from them.
The most challenging problems are
1 you need to use absolute disk read/write to write directly to disk
2 you need to implement a intelligent file cache or the TSR will be really
slow and almost unusable