[cfe-dev] strncpy checker

[Leonard Maiorani]

Attached is my first foray into Clang Static Analyzer contributions. Please review for style and correctness. Take punches at it if you will, I am tough enough. Unit tests are included.

strncpy() was not being checked at all, so this should solve that problem by ensuring that the 'n' parameter to strncpy() is not larger than the size of the buffer passed in because that would indicate a logic error and potential bus error.

-Lenny
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