Hmm,
snprintf.c is missing a copyright header, also implementing our own
snprintf feels like a serious case of NIH syndrome. Please use an
existing proven implementation like one of these:
http://www.jhweiss.de/software/snprintf.html
Until now logging for miniport and display went in different paths, display
knew how to use the QXL_IO_LOG port to allow basically seeing the debug
messages on the host with the rest of the qemu monitor output. But miniport
always went through VideoPortDbg, which made it harder to pretend there is
