1 files changed, 22 insertions, 0 deletions
diff --git a/lib9/utflen.c b/lib9/utflen.c
new file mode 100644
index 00000000..815cc040
--- /dev/null
+++ b/lib9/utflen.c
@@ -0,0 +1,22 @@
+#include "lib9.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;
+}