Fly_scan_stream is a project mainly written in C, it's free.
A General High Performance Ring buffer for scanning pattern from file stream
A General High Performance Ring buffer for scanning pattern from file stream.
This is ANSI C, just use ringbuf.[ch] in your project. support MSVC and GNU. License is BSD, so you are free to use in in your (commercial) product as long as you retain the copyright text in the files.