libutf8

libutf8 is a reasonably fast, robust encoder/decoder for UTF-8. It will encode UCS-4 (32-bit characters) into UTF-8, and decode UTF-8 into UCS-4. It is a "safe" UTF-8 decoder, rejecting overlong character representations and other illegal characters. libutf8 is a C library that presents simple functions for manipulating characters and strings, and a more powerful API for dealing with streamed data (e.g. from a TCP connection) efficiently.