Sigh I select C and it gives me C++. That perfectly sums up Microsoft's attitude to C :(
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...
My comment was more that the C example code is actually C++.
I had a quick look at their C++ word list [0] and it looks like _Imaginary and _Complex and _Bool are the only missing C99 keywords. Feel free to make a PR if you want them added :)
[0] https://github.com/Microsoft/monaco-languages/blob/master/sr...