detecting parameters

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2 total messages Started by Mats Fraennhagen Wed, 11 Nov 1992 09:32

#622

Author: Mats Fraennhagen
Date: Wed, 11 Nov 1992 09:32

11 lines
672 bytes

I've written a small program in assembler and I would like to
detect if any parameters like:

test -?

 is given after the filename. Does DOS support this?
 
 /Mats

-- 
 Mats Fraennhagen 	Email: d91mf@efd.lth.se

Re: detecting parameters

#626

Author: Duane A. Paulson
Date: Wed, 11 Nov 1992 17:51

29 lines
1474 bytes

In a previous article, d91mf@efd.lth.se (Mats Fraennhagen) says:

>I've written a small program in assembler and I would like to
>detect if any parameters like:
>
>test -?
>
> is given after the filename. Does DOS support this?
> 
> /Mats
>
>-- 
> Mats Fraennhagen 	Email: d91mf@efd.lth.se
>

Sure does. This info is in the Program Segment Prefix (PSP), which dos loads
as the first 256 bytes of any program. Register ES always points to the 
beginning of the PSP at the start of a program, no matter whether the program
is .COM or .EXE.

The start of the command tail (everything following the program name) is at
offset 81hex within the PSP. It ends with a CR. A count of the characters
in the command tail, including the terminating CR, can be found at offset
80hex within the PSP. Have fun! (C overhead isn't that much!)
-- 
Duane Paulson
ci922@cleveland.freenet.edu
duane.paulson@pcb.batpad.lgb.ca.us

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