A new edition of the book Modern C and much more are now available under a CC license via the following page
https://gustedt.gitlabpages.inria.fr/modern-c/
This edition is the result of a collaboration with Manning, and improves a lot over the previous edition; material has been rewritten and reordered, a lot of graphics have been added. Manning has a nicely formatted print and eBook versions of this, there are links and information how to purchase this through the central link above, even with a limited 50% price reduction. Or a click on the cover may directly take you to Manning.
Jens Gustedt's Blog 
Hi Jens. I was wondering is there any lecture slides based on the book?
Merci
Hello, no, sorry, there aren’t. I never came to give courses on C itself, only for using C in special contexts. Jens