Re: Why does the location of PAD move around?

From	Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem>
Newsgroups	comp.lang.forth
Subject	Re: Why does the location of PAD move around?
Date	2017-04-02 02:00 -0400
Organization	Aioe.org NNTP Server
Message-ID	<20170402020002.3808db50@_> (permalink)
References	<20170401210719.376d37f4@_> <b5864a00-12eb-4d9b-b82f-47e386ea42c1@googlegroups.com>

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On Sat, 1 Apr 2017 19:32:17 -0700 (PDT)
hughaguilar96@gmail.com wrote:

> On Saturday, April 1, 2017 at 6:06:23 PM UTC-7, Rod Pemberton wrote:
> > Why does the location of PAD move around?
> > 
> > TIB is allocated at a fixed location, but
> > PAD's location is relative to HERE.  
> 
> Asking such a question is like asking somebody to hold the bucket
> while you milk a male goat.

Smart ass, ...

Well, I'm not familiar with the historical uses of PAD, yet, but it
would seem that you could store data in memory relative to PAD in either
direction (up, down), unlike TIB where characters will be stored in
only one direction relative to TIB's address.  For PAD, one of the two
directions is likely to run into the end of the dictionary.  So, if you
wanted to prevent access to the dictionary from the use of PAD's
address, what would you do?  E.g., perhaps someone wants to prevent
intentional corruption of or accidental overwriting of the dictionary.
Where would you relocated PAD to?  Would you set PAD to a fixed-sized
buffer like TIB ?  For a fixed-sized buffer, would you need to
preallocate space on both sides of PAD's address for either upward or
downward storage?  I'm looking to correctly preserve the historic uses
of PAD while also changing PAD's location to limit aberrant access to
the dictionary.  Since PAD's location moves, I can't use fixed addresses
or pointer values for comparison for buffer under- or over-flow of
PAD.  I would need to use a variable, which in my case, would also
need to be accessible via C code.  I can do that, but it complicates the
issue and slows down the code too.  The ideal solution would be to have
a fixed address for PAD , i.e., single integer value, hence non-moving.

Are you interested in the question now Hugh, or are you still going to
insist that Andrew answer because the original question was so simple?

Rod Pemberton
-- 
All it takes for humanity to conquer the world's toughest problems
is to hope, to believe, to share, and to do, in cooperation.

Thread

Why does the location of PAD move around? Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2017-04-01 21:07 -0400
  Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-01 19:32 -0700
    Re: Why does the location of PAD move around? Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2017-04-02 02:00 -0400
      Re: Why does the location of PAD move around? Julian Fondren <julian.fondren@gmail.com> - 2017-04-01 23:51 -0700
        Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-01 21:59 -1000
        Re: Why does the location of PAD move around? krishna.myneni@ccreweb.org - 2017-04-09 09:54 -0700
  Re: Why does the location of PAD move around? Julian Fondren <julian.fondren@gmail.com> - 2017-04-01 20:10 -0700
    Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-01 18:39 -1000
    Re: Why does the location of PAD move around? Mark Wills <markwills1970@gmail.com> - 2017-04-02 08:29 -0700
  Re: Why does the location of PAD move around? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-02 04:13 -0500
    Re: Why does the location of PAD move around? Paul Rubin <no.email@nospam.invalid> - 2017-04-02 18:08 -0700
      Re: Why does the location of PAD move around? Julian Fondren <julian.fondren@gmail.com> - 2017-04-02 18:13 -0700
        Re: Why does the location of PAD move around? Paul Rubin <no.email@nospam.invalid> - 2017-04-02 18:22 -0700
          Re: Why does the location of PAD move around? Julian Fondren <julian.fondren@gmail.com> - 2017-04-02 18:31 -0700
          Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-03 04:37 +0200
            Re: Why does the location of PAD move around? Paul Rubin <no.email@nospam.invalid> - 2017-04-02 22:04 -0700
              Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-04 13:47 +0200
                Re: Why does the location of PAD move around? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-04 10:53 -0500
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-04 17:04 +0100
                Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-04 19:00 +0200
                Re: Why does the location of PAD move around? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-05 03:39 -0500
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-05 19:17 +0100
            Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-02 21:44 -1000
          Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-02 21:35 -1000
          Re: Why does the location of PAD move around? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-03 03:38 -0500
          Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-05 11:25 +1000
            Re: Why does the location of PAD move around? Paul Rubin <no.email@nospam.invalid> - 2017-04-05 18:23 -0700
              Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-07 14:26 +1000
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-07 08:47 +0100
                Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-08 10:25 +1000
                Re: Why does the location of PAD move around? Paul Rubin <no.email@nospam.invalid> - 2017-04-07 20:37 -0700
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-08 12:42 +0100
                Re: Why does the location of PAD move around? jason.songhurst@gmail.com - 2017-04-08 20:28 -0700
                Re: Why does the location of PAD move around? Coos Haak <htrofhc@gmail.com> - 2017-04-09 13:47 +0200
                Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-09 08:36 -1000
                Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-09 14:48 +0200
                Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-10 10:31 +1000
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-10 09:29 +0100
                Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-10 11:57 +0200
      Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-03 03:43 +0200
        Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-02 21:53 -1000
  Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-02 21:31 +1000
    Re: Why does the location of PAD move around? Coos Haak <htrofhc@gmail.com> - 2017-04-02 15:12 +0200
      Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-03 10:46 +1000
        Re: Why does the location of PAD move around? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-03 03:31 +0200
          Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-02 19:14 -0700
        Re: Why does the location of PAD move around? "Elizabeth D. Rather" <erather@forth.com> - 2017-04-02 21:55 -1000
          Re: Why does the location of PAD move around? "HAA" <someone@microsoft.com> - 2017-04-04 11:06 +1000
            Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-04 12:54 +0100
              Re: Why does the location of PAD move around? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-04 16:27 +0000
                Re: Why does the location of PAD move around? Alex <alex@rivadpm.com> - 2017-04-04 19:23 +0100
          Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-07 22:04 -0700
    Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-02 14:21 -0700
  Why does the location of PAD move around? Mark Wills <markwills1970@gmail.com> - 2017-04-02 08:28 -0700
    Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-02 13:47 -0700
      Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-02 15:13 -0700
        Re: Why does the location of PAD move around? hughaguilar96@gmail.com - 2017-04-02 18:55 -0700

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