To make replacing work sanely, we first NULL out both the eventHandlers
and loopHooks arrays in the Keyboardio_ constructor. This allows the
replace functions to just run through the whole array, and either see
hook pointers there, or NULL. So they don't need to be afraid of garbage
being there.
This makes the replacing very easy: run through the array, and replace
the first occurrence of the old hook with the new. This further
simplifies addition: the old hook we pass in, will be NULL. If we run
out of space, it silently fails, like before.
Replacing hooks is important for cases where one wants to build features
that can be toggled off, or their behaviour otherwise changed at
run-time. In this case, the most efficent way is to replace the hook,
which is what these new helpers allow us to do.
This closes#36.
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Gergely Nagy
Jesse Vincent