Implement 8-bit ctype suggestion #2 modified by Roy's (unsigned char) suggestion because Iain Brown <firstname.lastname@example.org> pointed out that my logic regarding the casting was wrong. This compiles and runs/works on both Linux and Solaris 2.6. I'm totally willing to back it out if there are complaints, I just figure this is the best way to get widespread multiplatform testing.
To test you need to request a URL with character 246 (�), and you should create a .htaccess in a directory with an AddDescription containing character 246 as well. (Actually, trying 240 through 255 would be good.)