Yes. It's a waste of time. Why should I hand-code a parser for C when it's a solved problem? Note that the source code I linked to calls into an already existing Spirit grammar for C (which I made some modifications to, mainly so I could get more information back from the parse tree).

Hand coding a parser is generally not a good use of your time. There are many tools available to generate a parser based on a BNF grammar. I used my project as an opportunity to learn one of them.