Explanation of CTL_CODES

[Barath Rk]

I am trying to implement the ReadConsoleInputEx(A|W) functions in
kernelbase(It is needed for Microsoft's edit.exe. See bug #58252). I
figured I could do that by defining a new CTL_CODE in
include/wine/condrv.h.

However, after a long time spent in exploring the source code, I don't get
where the handler for the codes, such IOCTL_CONDRV_READ_INPUT are defined.

Would appreciate some direction on this. Thanks in advance.