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I'm looking to write a small C compiler, and I can't seem to find the grammar for C99 anywhere. I've found the C90 and C99 standards document, but I can't find the grammar itself anywhere.
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Annex A in the C99 standard (as linked by Wikipedia) looks awfully like a grammar to me.
As far as I recall, there are some extra-grammatical issues with distinguishing typedef names from other identifiers that mean that one cannot just feed it into yacc and expect it to work, but it's the most authoritative source you'll find.