X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
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)
Organization: http://groups.google.com
Lines: 51
Message-ID: <a82db3f6-b6ec-4855-8749-50582406ac36@n7g2000prc.googlegroups.com>
References: <ca683ba1-e029-4556-ae77-37e6cb3f5658 AT p6g2000pre DOT googlegroups DOT com> 
	<gq7rb5$glk$1 AT aioe DOT org>
NNTP-Posting-Host: 76.115.70.155
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1237839254 31415 127.0.0.1 (23 Mar 2009 20:14:14 GMT)
X-Complaints-To: groups-abuse AT google DOT com
NNTP-Posting-Date: Mon, 23 Mar 2009 20:14:14 +0000 (UTC)
Complaints-To: groups-abuse AT google DOT com
Injection-Info: n7g2000prc.googlegroups.com; posting-host=76.115.70.155; 
	posting-account=05hOMwoAAAB6R8xtiQKzEljSMzgOhVF1
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) 
	Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729),gzip(gfe),gzip(gfe)
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

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