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devel / comp.lang.tcl / Re: tcl::chan::memchan and truncate

SubjectAuthor
* tcl::chan::memchan and truncateaotto1968
`* Re: tcl::chan::memchan and truncateaotto1968
 `* Re: tcl::chan::memchan and truncateRich
  `- Re: tcl::chan::memchan and truncateChristian Werner

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tcl::chan::memchan and truncate

<t6u5ik$o0d$1@dont-email.me>

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From: aotto1968@t-online.de (aotto1968)
Newsgroups: comp.lang.tcl
Subject: tcl::chan::memchan and truncate
Date: Sat, 28 May 2022 23:52:20 +0200
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 by: aotto1968 - Sat, 28 May 2022 21:52 UTC

hi

I replace some part of my code with tcl::chan::memchan and figure out
that there is an error:

error during truncate on "rc0": invalid argument
while executing
"chan truncate $FR 0"

It seems that tcl::chan::memchan does NOT support truncate.
but now I have a problem because I want to replace the
entire memchan space with new data and the new data is !! shorter !!
(in the example the FR is the tcl::chan::memchan)

chan truncate $FR 0 → error!

chan seek $FW 0
chan seek $FR 0
chan copy $FW $FR

without "truncate" the FR has now extra lines at the end.

question:

1) can I add an EOF character at the end of FR ?
2) is there an other way to "truncate" the memchan ?

https://core.tcl-lang.org/tcllib/doc/tcllib-1-18/embedded/www/tcllib/files/modules/virtchannel_base/tcllib_memchan.html

mfg AO

Re: tcl::chan::memchan and truncate

<t6v8pp$nfk$1@dont-email.me>

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From: aotto1968@t-online.de (aotto1968)
Newsgroups: comp.lang.tcl
Subject: Re: tcl::chan::memchan and truncate
Date: Sun, 29 May 2022 09:53:28 +0200
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 by: aotto1968 - Sun, 29 May 2022 07:53 UTC

On 28.05.22 23:52, aotto1968 wrote:
~~
>
> without "truncate" the FR has now extra lines at the end.
>
> question:
>
> 1) can I add an EOF character at the end of FR ?
> 2) is there an other way to "truncate" the memchan ?
>
>
>
https://core.tcl-lang.org/tcllib/doc/tcllib-1-18/embedded/www/tcllib/files/modules/virtchannel_base/tcllib_memchan.html

There is a workaround to use "tcl::chan::variable VARNAME" and on
"trucate" to set this variable to ""

→ a lot of extra code required to simulate a missing "truncate"

mfg.

Re: tcl::chan::memchan and truncate

<t702o0$2ao$1@dont-email.me>

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From: rich@example.invalid (Rich)
Newsgroups: comp.lang.tcl
Subject: Re: tcl::chan::memchan and truncate
Date: Sun, 29 May 2022 15:16:16 -0000 (UTC)
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 by: Rich - Sun, 29 May 2022 15:16 UTC

aotto1968 <aotto1968@t-online.de> wrote:
> On 28.05.22 23:52, aotto1968 wrote:
> ~~
> >
> > without "truncate" the FR has now extra lines at the end.
> >
> https://core.tcl-lang.org/tcllib/doc/tcllib-1-18/embedded/www/tcllib/files/modules/virtchannel_base/tcllib_memchan.html
>
> There is a workaround to use "tcl::chan::variable VARNAME" and on
> "trucate" to set this variable to ""
>
> ? a lot of extra code required to simulate a missing "truncate"

memchan is part of Tcllib, which means you have the full source.

Fix the code to support truncate and submit a patch to the maintainer.

Which is rather the point of open source, if something /you/ need is
not present, /you/ have the ability to actually add it, fixing the
issue for yourself, and everyone else who might need it in the future.

Re: tcl::chan::memchan and truncate

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Subject: Re: tcl::chan::memchan and truncate
From: undroidwish@gmail.com (Christian Werner)
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 by: Christian Werner - Sun, 29 May 2022 16:02 UTC

There's already a ticket with a patch plus a branch with an implementation.
For further information start at https://core.tcl-lang.org/tcllib/tktview/1985a342552755d5aa4c

HTH,
Christian

devel / comp.lang.tcl / Re: tcl::chan::memchan and truncate

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