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Adding features does not necessarily increase functionality -- it just makes the manuals thicker.

devel / comp.os.msdos.programmer / text mode for open

text mode for open

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Subject: text mode for open
From: mutazilah@gmail.com (muta...@gmail.com)
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by: muta...@gmail.com - Sat, 22 Oct 2022 04:04 UTC

I would like PDOS/86, a sort-of MSDOS clone, to have an
extension which is letting the OS know whether the file
being opened is being opened in text or binary mode.

Cygwin has an O_TEXT/O_BINARY extension to the
Unix open() basically doing the same thing.

The creat() call has 8 unused bits I could use:

http://www.ctyme.com/intr/rb-2778.htm

The open() call has a bit 3 in AL:

http://www.ctyme.com/intr/rb-2779.htm

which is reserved which I could use to indicate that
BX is populated with a fresh set of 16 bits, even
though I only need 1.

Any suggestions?

Thanks. Paul.

Re: text mode for open

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From: usotsuki@buric.co (Steve Nickolas)
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Subject: Re: text mode for open
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by: Steve Nickolas - Sat, 22 Oct 2022 05:44 UTC

On Fri, 21 Oct 2022, muta...@gmail.com wrote:

> I would like PDOS/86, a sort-of MSDOS clone, to have an
> extension which is letting the OS know whether the file
> being opened is being opened in text or binary mode.
>
> Cygwin has an O_TEXT/O_BINARY extension to the
> Unix open() basically doing the same thing.

I feel like this should be handled in the libc, for compatibility, as
existing MS-DOS compilers do (in exactly the same way you describe).

-uso.

Re: text mode for open

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Subject: Re: text mode for open
From: mutazilah@gmail.com (muta...@gmail.com)
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by: muta...@gmail.com - Sat, 22 Oct 2022 06:07 UTC

On Saturday, October 22, 2022 at 1:43:20 PM UTC+8, Steve Nickolas wrote:
> On Fri, 21 Oct 2022, muta...@gmail.com wrote:
>
> > I would like PDOS/86, a sort-of MSDOS clone, to have an
> > extension which is letting the OS know whether the file
> > being opened is being opened in text or binary mode.
> >
> > Cygwin has an O_TEXT/O_BINARY extension to the
> > Unix open() basically doing the same thing.

> I feel like this should be handled in the libc, for compatibility, as
> existing MS-DOS compilers do (in exactly the same way you describe).

I can still get the libc to generate a CRLF when writing to
the OS. But once the OS knows that this is a text file, it
can choose to convert the CRLF into LF if the OS/user wishes.

Wouldn't that be the ideal?

BFN. Paul.

Subject	Author
text mode for open	muta...@gmail.com
text mode for open	Steve Nickolas
text mode for open	muta...@gmail.com