🚀 go-pugleaf

From article <valley.659043938@gsbsun>, by valley@uchicago (Doug Dougherty):
> motti@ocsmd.ocs.com (Motti Bazar) writes:
> 
> My question is a related one.  I am currently developing an "ASK" device
> driver.  You put it in your CONFIG.SYS like this:
> 
> 	device=ASK.SYS VDISK.SYS 384 /X
> 
> and it asks you whether or not you want to load VDISK.

During the loading of device drivers, MS-DOS loads the ENTIRE config.sys
into memory, munges it with '\0'-s following each line and each
DEVICE=NAME, and then indexes through the list, calling the INIT
function of drivers, etc...

Thus, it should be simple to implement ASK.SYS so:
	DEVICE=ASK.SYS	// asks about the NEXT driver in config.sys
	DEVICE=VDISK.SYS 384 /x
if the answer is NO, ASK.SYS would change the '\0' following its
command line, and the '\0' following VDISK.SYS to be '\n' (or
any non-zero char), thus 'eating' the next line; if the answer is YES,
ASK.SYS would do nothing, but merely exit with no memory allocated.

	[Actually, it is possible that a very long CONFIG.SYS would
	not all be loaded at once - I haven't checked; I suspect that
	the entire file is read, because of the complicated
	pre-processing performed before calling any driver's
	INIT entry.]

Tom Roberts
att!ihlpl!tjrob  TJROB@IHLPL.ATT.COM