UTF-8 validator

I wrote a little UTF-8 'validator' that checks stdin for a correct UTF-8 stream, and reports any errors along the way. It is very stringent; it even reports overlong forms as an error condition, in addition to the usual unexpected byte errors and such. One problem is that it is ``SLOW AS FUCK''; it can only check about 1.5 MB/s of random bytes on my netbook. Could you, the experts of optimisation, help me, /prog/?

Note: get rid of the ``inline''s if it fails to compile. I was just being retarded there.

http://pastebin.com/e5RrL6nq

>>25
Mobile arena?  Oh you mean the "fragmented cheap chinese shit for which you can barely find firmware updates, much less source code or (god forbid) specifications" arena?  No thanks, I like my freedom.  If it says "MIPS" or "ARM" or "Tegra" on the package, you can be certain not to ever truly own your device.  Fuck your shit, faggot.