Spilornis is part of the Eagle project.
It is a utility library that implements the Tcl list splitting and joining algorithm in native code.
It is fully Unicode (UCS-2 / UTF-16) aware, is based on the official Tcl sources, and may be used by any project.
When optionally enabled for use by the core Eagle library (i.e. managed code), a few things will occur:
The code can be seen within the Eagle source code distribution , with the primary C source code file being Spilornis.c.