We are definitely cheating there - we use the same colorizer for C and C++. I don't remember why we define two different languages that point to the same colorizer.

Please help us out and contribute a PR. Here[1] is where we register the C language and point to the cpp colorizer. And here[2] is the cpp colorizer. Please go ahead and try the C++ colorizer out at the Monarch playground[3] and edit it to make it colorize only C keywords, etc. Here[4] are the steps for adding a new colorizer.

Looking forward for a contribution on this :).

[1] https://github.com/Microsoft/monaco-languages/blob/master/sr...

[2] https://github.com/Microsoft/monaco-languages/blob/master/sr...

[3] https://microsoft.github.io/monaco-editor/monarch.html

[4] https://github.com/Microsoft/monaco-languages#dev-adding-a-n...