It allows to access the device on filesystem level by calling chdir() with
the directory returned.
<tag/Notes/<itemize>
+<item>Calling getdevicedir() <em/does/ check for a (formatted) disk in a
+floppy-disk-type device and returns NULL if that check fails.
<item>The function is only available as fastcall function, so it may only
be used in presence of a prototype.
</itemize>
<tag/Example/<verb>
chdir (getdevicedir (device, buf, sizeof buf));
</verb>
+cf. <tt/samples/enumdevdir.c/
</descrip>
</quote>