stanley@phoenix.com (John Stanley) (01/05/91)
I have a nice, cute little C program that duplicates the 'which' command
from UNIX. Basically, it searches the path for what will be executed for
any given command (i.e. 'which format' tells me 'C:\DOS\FORMAT.COM').
I have also packed a lot of stuff into my path by using SUBST to create
new drives. E.g., Q: points to D:\WP50. (All 26 drive letters are used,
except G:, which is reserved for a ram disk when I need it.)
Now the problem. I still think in terms of D:\WP50, since that is more
reasonable than Q:. I really want this 'which' to show both the SUBST
drive and the real path. E.g. "Q:\WP.EXE -=> D:\WP50\WP.EXE"
Is there a system call that will expand a SUBST drive name into the real
path? I see none in any of the docs I have. Right now, the only way I
can think of is to do a system() call, dumping the output of a SUBST
command to a file, and reading that back in. Ick! I do it, and it works,
but, oooohhhh.
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stanley@PhoEnix.com
Tara: "They are carpenters and gardeners, and not tomato men."ralf+@cs.cmu.edu (Ralf Brown) (01/06/91)
In article <HsBaV2w163w@phoenix.com> stanley@phoenix.com (John Stanley) writes: }Is there a system call that will expand a SUBST drive name into the real }path? I see none in any of the docs I have. Right now, the only way I }can think of is to do a system() call, dumping the output of a SUBST }command to a file, and reading that back in. Ick! I do it, and it works, }but, oooohhhh. There is no system call, but you can grunge around in the DOS data structures to find out. Take a look at INT 21/AH=52h in INTER191.ZIP, now available from msdos.archive.umich.edu in /pub or /msdos/info grape.ecs.clarkson.edu in /incoming/msdos chyde.uwasa.fi in /pc/incoming and soon (probably by the time you read this) from wsmr-simtel20.army.mil in PD1:<MSDOS.INFO> -- {backbone}!cs.cmu.edu!ralf ARPA: RALF@CS.CMU.EDU FIDO: Ralf Brown 1:129/3.1 BITnet: RALF%CS.CMU.EDU@CMUCCVMA AT&Tnet: (412)268-3053 (school) FAX: ask DISCLAIMER? Did | Everything is funny as long as it is happening to I claim something?| someone else. --Will Rogers
ralf+@cs.cmu.edu (Ralf Brown) (01/06/91)
In article <HsBaV2w163w@phoenix.com> stanley@phoenix.com (John Stanley) writes: }Is there a system call that will expand a SUBST drive name into the real }path? I see none in any of the docs I have. Right now, the only way I }can think of is to do a system() call, dumping the output of a SUBST }command to a file, and reading that back in. Ick! I do it, and it works, }but, oooohhhh. There is an undocumented system call (INT 21/AH=60h) which will expand SUBST and JOIN paths. Or you can grunge around in the DOS data structures to find out--take a look at INT 21/AH=52h in the interrupt list. I have just released a new version, INTER191.ZIP, now available from msdos.archive.umich.edu in /pub or /msdos/info grape.ecs.clarkson.edu in /incoming/msdos chyde.uwasa.fi in /pc/incoming and soon (probably by the time you read this) from wsmr-simtel20.army.mil in PD1:<MSDOS.INFO> -- {backbone}!cs.cmu.edu!ralf ARPA: RALF@CS.CMU.EDU FIDO: Ralf Brown 1:129/3.1 BITnet: RALF%CS.CMU.EDU@CMUCCVMA AT&Tnet: (412)268-3053 (school) FAX: ask DISCLAIMER? Did | Everything is funny as long as it is happening to I claim something?| someone else. --Will Rogers