Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.forth > #134693

Re: How does the input stream traditionally work?

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.forth
Subject Re: How does the input stream traditionally work?
Date 2026-03-15 18:09 -0700
Organization A noiseless patient Spider
Message-ID <87o6kod1h3.fsf@nightsong.com> (permalink)
References (1 earlier) <2026Mar14.122649@mips.complang.tuwien.ac.at> <871phleh3v.fsf@nightsong.com> <69b65f35$1@news.ausics.net> <87wlzcdesv.fsf@nightsong.com> <69b744ec@news.ausics.net>

Show all headers | View raw

dxf <dxforth@gmail.com> writes:
> It would prevent nested files from passing data on the stack.

Oh I think I understand what you mean now.  LOAD can't have extra stuff
on the data stack when it transfers control to the newly loaded block or
file.  But, it can use the DS temporarily while getting the new block
ready to run.  It could even return after modifying the input stream
pointer so execution would continue in the new block.  Location in the
old stream would have to be saved somewhere, and restored on reaching
EOF in the new block or file.

> Loading works on the principle of a 'current file' whose pointer is
> saved/restored during nesting.

Ok but in this case why is the return stack depth a limiting factor?
The FDB pointer is just one cell, maybe even a static cell.  Then you
have an array of FDB's that is used as a stack with the FDB pointer as a
stack pointer, if I understand what you mean.

Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-13 15:10 -0700
  Re: How does the input stream traditionally work? peter <peter.noreply@tin.it> - 2026-03-14 10:12 +0100
    Re: How does the input stream traditionally work? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-03-14 15:09 +0000
      Re: How does the input stream traditionally work? peter <peter.noreply@tin.it> - 2026-03-14 23:30 +0100
        Re: How does the input stream traditionally work? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-03-15 14:02 +0000
          Re: How does the input stream traditionally work? albert@spenarnc.xs4all.nl - 2026-03-15 19:25 +0100
  Re: How does the input stream traditionally work? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-03-14 11:26 +0000
    Re: How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-14 23:34 -0700
      Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-03-15 18:26 +1100
        Re: How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-15 13:21 -0700
          Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-03-16 10:46 +1100
            Re: How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-15 18:09 -0700
              Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-03-16 13:13 +1100
                Re: How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-16 15:14 -0700
                Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-03-17 10:37 +1100
                Re: How does the input stream traditionally work? Paul Rubin <no.email@nospam.invalid> - 2026-03-16 17:27 -0700
                Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-03-17 12:48 +1100
                Re: How does the input stream traditionally work? albert@spenarnc.xs4all.nl - 2026-03-17 11:16 +0100
                Re: How does the input stream traditionally work? Gerry Jackson <do-not-use@swldwa.uk> - 2026-03-17 11:27 +0000
            Re: How does the input stream traditionally work? dxf <dxforth@gmail.com> - 2026-04-21 18:40 +1000
              Re: How does the input stream traditionally work? albert@spenarnc.xs4all.nl - 2026-04-21 12:39 +0200
              Re: How does the input stream traditionally work? Hans Bezemer <the.beez.speaks@gmail.com> - 2026-04-21 19:47 +0200
      Re: How does the input stream traditionally work? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-03-15 16:29 +0000
        Re: How does the input stream traditionally work? albert@spenarnc.xs4all.nl - 2026-03-15 19:48 +0100
  Re: How does the input stream traditionally work? albert@spenarnc.xs4all.nl - 2026-03-14 15:33 +0100

csiph-web