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From:	Jim Michaels <jmichae3 AT yahoo DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Documentation error
Date:	Mon, 23 Mar 2009 13:14:14 -0700 (PDT)
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On Mar 23, 3:24=A0am, "Rod Pemberton" <do_not_h DOT  DOT  DOT  AT nohavenot DOT cmm> wrote:
> "Jim Michaels" <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote in message
>
> news:ca683ba1-e029-4556-ae77-37e6cb3f5658 AT p6g2000pre DOT googlegroups DOT com...
>
> > but [setdisk] is not returning the correct drive number.
>
> Since it's just a wrapper around Int 0x21, AH=3D0Eh, I'd say it's returni=
ng
> the correct values for the DOS function used.
>
> > [setdisk] does a whammy on you and returns a 1-based drive
> > number instead of the zero-based number it took. =A0This is not the
> > documentation given in djgpp.
>
> In libc.info under setdisk()'s "Return Value":
>
> =A0 "The highest drive actually present that the system can reference."
>
> AFAICT, the DJGPP documentation doesn't say anything about a either a zer=
o
> or a one based drive number being returned...
>
> As you mentioned, it'd be nice to know the return value is one based, but=
 I
> think the documentation could use even more clarification. =A0The quoted
> statement above from DJGPP's libc.info document isn't correct in the leas=
t.
> According to the Int 0x21, AH=3D0Eh RBIL information (link below), LASTDR=
IVE=3D
> could set a drive number that is larger than the "highest drive actually
> present". =A0E.g., LASTDRIVE=3DZ which should return 26, but only A throu=
gh F
> are present in someone's system. =A0Or, if only a few drives are present,=
 it
> might return five (5) which is also larger than the number of drives
> present.
>
> http://www.delorie.com/djgpp/doc/rbinter/id/81/25.html
>
> Also, I think one could make a case for DJGPP that setdisk() should retur=
n
> the drive number that was set by setdisk(), or an error if the drive isn'=
t
> present.
>
> Rod Pemberton

interesting.  different sets of documentation give different things.
the one I was referring to was at http://www.delorie.com/djgpp/doc/libc/
Jim Michaels

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