I'm trying to work on a kind of code generator to help unit-testing an legacy C/C++ blended project. I don't find any kind of independent tool can generate stub code from declaration. So I decide to build one, it shouldn't be that hard. 

Please, anybody can point me a standard grammar link, better described by yacc language.

Hope I'm not reinventing wheel, please help me out in that case.

Best Regards,
Kevin