utf8checker.c - Routines to check a byte stream for valid utf-8
utf8checker.h - Header file for utf8checker.c
utf8checkerdemo.c - Demo that checks the given file verbosely
utf8checkerdemofixed.c - Demo that checks four hard-coded byte arrays

This is a little bit of C code I wrote in response to a question on
stackoverflow.com about how to verify that a byte stream was valid
utf-8 manually.

It's only been tested to the extent that the two included demo programs
have been run and I'm satisfied with the results.  Anyone's free to use
the algorithms contained in the code at their own risk, and the code
itself under the Apache license (v. 2.0).  (if that license doesn't work
for you, contact me and I'll probably be willing to relicense the code
under some additional license)

Daniel Martin <martin@snowplow.org>, 21-May-2009