Does anyone have a nice code snippet that takes a byte containing a hex
character (0x30 through 0x39 and 0x41 through 0x46) and converting it to a
plain numeric byte, 0x00 through 0x0F? Everything that comes to mind seems
wasteful and clunky.

The character coming in may also contain junk that must be filtered out.

Thanks!

Happy long weekend if you get one. Cheers,
Bob