Groups > comp.os.msdos.programmer > #405

Re: command history in dos - how?

From	Ross Ridge <rridge@csclub.uwaterloo.ca>
Newsgroups	comp.os.msdos.programmer
Subject	Re: command history in dos - how?
Date	2011-11-02 16:21 -0400
Organization	University of Waterloo
Message-ID	<j8s8o6$d7s$1@rumours.uwaterloo.ca> (permalink)
References	<pan.2011.11.02.13.50.37@sejlgarnet.dk> <j8rljq$70e$1@rumours.uwaterloo.ca> <pan.2011.11.02.18.56.13@sejlgarnet.dk>

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Ross Ridge wrote:
> I think you'd want to hook INT 21h, AH=0Ah, check that standard input
> hasn't been directed, 

Thomas Jensen  <lianergoist@sejlgarnet.dk> wrote:
>Well, I must admit I don't know how to check that. Do you?

Not off hand, but it may not really matter.  Just use INT 21h, AH=06h
DL=FFh or some similar function to read each character, and if it's been
redirected you'll get that instead.

>Well, I think is is a bit more complicated than that. I think Jim Leonard 
>is on the right track. Function 44h/int21h and its subfunctions seems to 
>be useful, and I will try to play with it and see if I can come up with 
>something.

Well, I'm pretty sure hooking INT 21h, AH=0Ah is key here.  Jim Leonard
hasn't suggested anything remotely like an alternative.  The only useful
thing I can see you can do with an IOCTL here is maybe detect whether
you're reading from the console device or not.  Nothing magic.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge@csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //

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Thread

command history in dos - how? Thomas Jensen <lianergoist@sejlgarnet.dk> - 2011-11-02 13:50 +0000
  Re: command history in dos - how? Ross Ridge <rridge@csclub.uwaterloo.ca> - 2011-11-02 10:54 -0400
    Re: command history in dos - how? Thomas Jensen <lianergoist@sejlgarnet.dk> - 2011-11-02 18:56 +0000
      Re: command history in dos - how? Ross Ridge <rridge@csclub.uwaterloo.ca> - 2011-11-02 16:21 -0400
  Re: command history in dos - how? Jim Leonard <mobygamer@gmail.com> - 2011-11-02 08:28 -0700
    Re: command history in dos - how? Thomas Jensen <lianergoist@sejlgarnet.dk> - 2011-11-02 19:03 +0000
    Re: command history in dos - how? Ross Ridge <rridge@csclub.uwaterloo.ca> - 2011-11-02 16:31 -0400
  Re: command history in dos - how? Rugxulo <rugxulo@gmail.com> - 2011-11-02 12:38 -0700

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