Plan 9 from Bell Labs’s /sys/src/games/aprep/runeinf.h
typedef struct Runeinf Runeinf; struct Runeinf { uchar class; Rune lower; Rune upper; char latin[4]; }; enum { Unknown = 0, Alpha, Control, Null, Numer, Punct, Space, }; void runeinf(Rune, Runeinf*);