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Path: utzoo!watmath!clyde!cbosgd!hplabs!hp-pcd!bobm
From: bobm@hp-pcd.UUCP (bobm)
Newsgroups: net.micro.pc
Subject: Re: command name and DOS 3.x
Message-ID: <15200017@hpcvlo.UUCP>
Date: Wed, 12-Mar-86 12:59:00 EST
Article-I.D.: hpcvlo.15200017
Posted: Wed Mar 12 12:59:00 1986
Date-Received: Sat, 15-Mar-86 19:36:48 EST
References: <1301@voder.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 19
Nf-ID: #R:voder:-130100:hpcvlo:15200017:000:879
Nf-From: hpcvlo!bobm    Mar 12 09:59:00 1986


	Look on page 7-7 of the DOS TechRef. In DOS 3.x, the name used
	to invoke the program is stored after the enviroment space.
	To find it, get the word at offset 2CH in the PSP. That's the 
	segment address of the enviroment. Scan through the enviroment
	a byte at a time until you find two consecutive zero bytes (the
	end of the enviroment).Following those zeros is a 1-word "count",
	followed by an ASCIIZ string, which is the drive, path, name and
	extension of the executing program. I'm not really sure what the 
	"count" is supposed to indicate. It seems to always be set to 1. 
	Also, the string has some wierd uppercase/lowercase conversions.
	The name and extension of the program are always uppercase, but 
	the drive and path come back in various cases, depending on where 
	the program is, what the path is, the phase of the moon...

	Bob May
	hplabs!hp-pcd!bobm