C89 and C99 are both standards that are endorsed by ANSI. [0] (At least, they were endorsed, as they're now both behind the times.)
The Lua interpreter is written in a subset of C that behaves identically when compiled as C++, they call this 'Clean C'. [1]
[0] https://en.wikipedia.org/wiki/ANSI_C
[1] https://www.lua.org/manual/5.4/manual.html
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