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tcl::transform::limitsize(3tcl) Reflected/virtual channel support tcl::transform::limitsize(3tcl)


tcl::transform::limitsize - limiting input


package require Tcl 8.6

package require tcl::transform::core ?1?

package require tcl::transform::limitsize ?1?

::tcl::transform::limitsize chan max


The tcl::transform::limitsize package provides a command creating a channel transformation which limits the number of characters which can be read from the channel. A generator for an artificial EOF.

The internal TclOO class implementing the transform handler is a sub-class of the tcl::transform::core framework.


::tcl::transform::limitsize chan max
This command creates a size limiting transformation on top of the channel chan and returns its handle.

max is the number of bytes which can be read from the channel before EOF is signaled by the transformation. Note that popping the transformation clears the EOF it generated as well.


This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category virtchannel of the Tcllib Trackers []. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.


channel transformation, limitsize, reflected channel, size limit, tip 230, transformation, virtual channel




Copyright (c) 2009 Andreas Kupries <>
1 tcllib