[GEM Development] Batch File Programming for GEM.BAT

[Shane M. Coughlan]

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Night Hawk wrote:
>  Yes, I do have a few ideas. From your last e-mail I gathered that the
> main point is to discover which two drive letters are free to use, given
> that this will not be known in advance. I can write a small utility in
> "C" (or even assembly, but it take longer) to basically ask how much
> free space there is on a series of drive letters (and as Owen suggested
> start with 'Z' and work down from there). If the drive letter returns an
> error, then that drive letter does not exist. Once the utility finds a
> drive letter that does exist then the utility can compare the free space
> returned against the total size of the drive. If equal then that drive
> letter is free to use.

Hi Todd

I have one question: if the utility finds a drive letter that does not
exist (say "Z:"), what action will it take?  I assume it would then say
that this drive letter can be used for the SUBST action?

Example:
On a machine with a A:, C: and E: drive the utility runs and finds Z: is
free.  It also finds Y: is free.  Therefore the utility sends Z: into
the environment as %SWAPDRIVE% and Y: as %GEMDRIVE%.  This allows
GEM.BAT to run with the following two lines:

 subst %SWAPDRIVE% C:\OPENGEM\GEMSWAP
 subst %GEMDRIVE% C:\OPENGEM

Am I correct in this assumption?

By the way, as far as I know FreeDOS uses the same function calls as
MSDOS.  It is intended to be 100% compatible.  I have posted to the
FreeDOS list for additional confirmation.

Regards

Shane


- --
Shane Martin Coughlan
e: shane at shaneland.co.uk
m: +447773180107
w: www.shaneland.co.uk
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