1 files changed, 30 insertions, 0 deletions
diff --git a/libkern/utfrrune.c b/libkern/utfrrune.c
new file mode 100644
index 00000000..b4594321
--- /dev/null
+++ b/libkern/utfrrune.c
@@ -0,0 +1,30 @@
+#include <lib9.h>
+
+char*
+utfrrune(char *s, long c)
+{
+	long c1;
+	Rune r;
+	char *s1;
+
+	if(c < Runesync)		/* not part of utf sequence */
+		return strrchr(s, c);
+
+	s1 = 0;
+	for(;;) {
+		c1 = *(uchar*)s;
+		if(c1 < Runeself) {	/* one byte rune */
+			if(c1 == 0)
+				return s1;
+			if(c1 == c)
+				s1 = s;
+			s++;
+			continue;
+		}
+		c1 = chartorune(&r, s);
+		if(r == c)
+			s1 = s;
+		s += c1;
+	}
+	return 0;
+}