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u9fs: make it compile

--- a/sys/src/cmd/unix/u9fs/makefile

+++ b/sys/src/cmd/unix/u9fs/makefile

@@ -42,7 +42,8 @@

 	strecpy.o\

 	tokenize.o\

 	u9fs.o\

-	utfrune.o

+	utflen.o\

+	utfrune.o\

 HFILES=\

 	fcall.h\

--- a/sys/src/cmd/unix/u9fs/plan9.h

+++ b/sys/src/cmd/unix/u9fs/plan9.h

@@ -97,7 +97,8 @@

 	UTFmax		= 3,		/* maximum bytes per rune */

 	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */

 	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */

-	Runeerror	= 0x80		/* decoding error in UTF */

+	Runeerror	= 0x80,		/* decoding error in UTF */

+	Runemax		= 0xFFFF,	/* 16 bit rune */

 };

 extern	int	runetochar(char*, Rune*);

--- /dev/null

+++ b/sys/src/cmd/unix/u9fs/utflen.c

@@ -1,0 +1,22 @@

+#include <plan9.h>

+

+int

+utflen(char *s)

+{

+	int c;

+	long n;

+	Rune rune;

+

+	n = 0;

+	for(;;) {

+		c = *(uchar*)s;

+		if(c < Runeself) {

+			if(c == 0)

+				return n;

+			s++;

+		} else

+			s += chartorune(&rune, s);

+		n++;

+	}

+	return 0;

+}

-- 

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