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From: "Rod Pemberton" <do_not_have AT notreplytome DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: csdpmi7 not working on virtualbox, how use dosmemget with seg ofs from int21h?
Date: Wed, 16 Mar 2011 15:04:45 -0400
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

"Rod Pemberton" <do_not_have AT notreplytome DOT cmm> wrote in message
news:ilqu49$5v6$1 AT speranza DOT aioe DOT org...
>
> Here's
> my code, after my .sig, which is *tested* and *working*.
>

Let me clarify that...

Windows 95/98/SE/ME provides function 7303h for FAT32 drives.  Looking at
RBIL, I'm not sure if this is available in real mode MS-DOS, or not.  I.e.,
it may only be available in a Windows console, or "dosbox".

So, the code I posted works with DJGPP v2.03 and v2.04 in a Windows 98 SE
console widow, or "dosbox".  The code *does not* work for me with MS-DOS
v7.10.  DOSLFN upto and including v0.40e supports most of the 71xxh LFN
functions and none of the 73xxh FAT32 functions.  So, DOSLFN doesn't help
any.

For a the working code in a console window, r.x.ax=7303h and CF=0.  The CF
is: r.x.flags&1.  For MS-DOS v7.10, my code returns r.x.ax=57h and CF=1.
RBIL says AL=0 on unsupported DOS versions.  So, 7303h _should_ be
supported.  If it works in a Windows 98 console, it works for real mode DOS
too.  Sorry, I do not know what the issue is yet, i.e., programming error by
me, or an unsupported function in DOS.  I could try Jason's code for you...

> FYI, dosmemput()
> copies more characters than passed.  You can fix it.  That could be
> considered an error or poor programming, for a few reasons: fixed size,
> too much, or not enough depending on the length of the path string.

I.e., use sizeof(), or a maximum path value of 261, whichever is smaller.


Rod Pemberton