convert to 4-byte UTF-8 and 32-bit Rune

http://codereview.appspot.com/116075

include/fmt.h

@@ -30,7 +30,7 @@ struct Fmt{
 	void	*farg;			/* to make flush a closure */
 	int	nfmt;			/* num chars formatted so far */
 	va_list	args;			/* args passed to dofmt */
-	int	r;			/* % format Rune */
+	Rune	r;			/* % format Rune */
 	int	width;
 	int	prec;
 	unsigned long	flags;

include/utf.h

@@ -4,14 +4,15 @@
 extern "C" { 
 #endif
 
-typedef unsigned short Rune;	/* 16 bits */
+typedef unsigned int Rune;	/* 32 bits */
 
 enum
 {
-	UTFmax		= 3,		/* maximum bytes per rune */
+	UTFmax		= 4,		/* maximum bytes per rune */
 	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
 	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
-	Runeerror	= 0xFFFD		/* decoding error in UTF */
+	Runeerror	= 0xFFFD,	/* decoding error in UTF */
+	Runemax = 0x10FFFF	/* maximum rune value */
 };
 
 /* Edit .+1,/^$/ | cfn $PLAN9/src/lib9/utf/?*.c | grep -v static |grep -v __ */