How much of that is due to the C preprocessor though? In theory, you could run the same preprocessor for Rust code (if you figure out some sensible macro shortcuts).
It's a completely apples to oranges comparison, with the rust version having some error handling, support for longer identifiers, tests, relatively idiomatic style with line breaks and indentation where you expect it, variables and type names longer than one or two characters, etcetra.
You could compress it massively before going for the preprocessor. In fact, a few of the preprocessor macros just make the C version longer (when measured in lines) than it would be without those macros if lines were allowed to be as long as in the rust version (<70 chars vs 100 chars). The printf macro (used only three times) actually makes the C code longer both in bytes and lines (or equal length in lines if you retain the 70 column limit).
There's really only one macro (DO) that expands enough to save lines, but just barely. The shorthand for return saves quite a few bytes (but not so many lines) given that it's used everywhere.
