I'm coming from user-level development and I'm completely new to C/C++ on the kernel level. What I have to implement is a string parser based on a split function like strtok known from string.h. 
As far as I discovered yet one can not use string.h or cstring.h anymore. Then I found out about the WDF and its wdfstring.h but there are just some "constructor"-functions in there, where is the rest?

So my main question is: What functions for string manipulation are available and what do I have to create? I don't want to reinvent the wheel, you know.

Thanks in advance!