From: Martin Str|mberg <ams AT ludd DOT luth DOT se>
Message-Id: <200102262121.WAA21045@mother.ludd.luth.se>
Subject: Re: LFN and FreeDOS
To: djgpp-workers AT delorie DOT com
Date: Mon, 26 Feb 2001 22:21:32 +0100 (MET)
In-Reply-To: <9003-Mon26Feb2001214351+0200-eliz@is.elta.co.il> from "Eli Zaretskii" at Feb 26, 2001 09:43:51 PM
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According to Eli Zaretskii:
> Because RBIL says:
> 
> INT 21 - Windows95 - LONG FILENAME - GET VOLUME INFORMATION
> 	AX = 71A0h
> 	DS:DX -> ASCIZ root name (e.g. "C:\")
> 	ES:DI -> buffer for file system name
> 	CX = size of ES:DI buffer
> Return: CF clear if successful
> 	    AX destroyed (0000h and 0200h seen)
> 	    BX = file system flags (see #01783)
> 	    CX = maximum length of file name [usually 255]
> 	    DX = maximum length of path [usually 260]
> 	    ES:DI buffer filled (ASCIZ, e.g. "FAT","NTFS","CDFS")
> 	CF set on error
> 	    AX = error code

In my version the line above here reads "AX = error code (see #01680)"
but I haven't updated it for a while.

> 		7100h if function not supported
> 
> So it looks like either FreeDOS does not comply to what it should be,
> or maybe RBIL is inaccurate.
> 
> In general, unsupported functions should return something more
> prominent than just AX = 1, though.

But FreeDOS does return with carry set indicating failure (all
according to the RBIL entry above). Should we really ignore that? I
don't think so.

BTW, does older DOZE versions (e. g. 5, as you can test it) really
return with AX = 0x7100? DOZE 6.22 Swedish version does.


Right,

						MartinS