Extend the keyboard character size to 24 bits.

Because we use an int to store keyboard chacacters and their flags, we
can easily store the flags in the top byte instead of the second byte.
This means it's a lot easier to make Unicode work.

The only change that still needs to be made, is that keyent_t's map is
extended to u_int.

Obtained from:	//depot/projects/newcons/sys/sys/kbio.h

1 files changed, 17 insertions, 11 deletions

diff --git a/sys/sys/kbio.h b/sys/sys/kbio.h
index 00bcacf..6f82c6d 100644
--- a/sys/sys/kbio.h
+++ b/sys/sys/kbio.h
@@ -229,16 +229,22 @@ typedef struct fkeyarg	fkeyarg_t;
 
 /* flags set to the return value in the KD_XLATE mode */
 
-#define NOKEY		0x100		/* no key pressed marker 	*/
-#define FKEY		0x200		/* function key marker 		*/
-#define MKEY		0x400		/* meta key marker (prepend ESC)*/
-#define BKEY		0x800		/* backtab (ESC [ Z)		*/
-
-#define SPCLKEY		0x8000		/* special key			*/
-#define RELKEY		0x4000		/* key released			*/
-#define ERRKEY		0x2000		/* error			*/
-
-#define KEYCHAR(c)	((c) & 0x00ff)
-#define KEYFLAGS(c)	((c) & ~0x00ff)
+#define	NOKEY		0x01000000	/* no key pressed marker 	*/
+#define	FKEY		0x02000000	/* function key marker 		*/
+#define	MKEY		0x04000000	/* meta key marker (prepend ESC)*/
+#define	BKEY		0x08000000	/* backtab (ESC [ Z)		*/
+
+#define	SPCLKEY		0x80000000	/* special key			*/
+#define	RELKEY		0x40000000	/* key released			*/
+#define	ERRKEY		0x20000000	/* error			*/
+
+/*
+ * The top byte is used to store the flags.  This means there are 24
+ * bits left to store the actual character.  Because UTF-8 can encode
+ * 2^21 different characters, this is good enough to get Unicode
+ * working.
+ */
+#define KEYCHAR(c)	((c) & 0x00ffffff)
+#define KEYFLAGS(c)	((c) & ~0x00ffffff)
 
 #endif /* !_SYS_KBIO_H_ */