1 files changed, 29 insertions, 0 deletions
diff --git a/libkern/utfrune.c b/libkern/utfrune.c
new file mode 100644
index 00000000..9925af81
--- /dev/null
+++ b/libkern/utfrune.c
@@ -0,0 +1,29 @@
+#include <lib9.h>
+
+char*
+utfrune(char *s, long c)
+{
+	long c1;
+	Rune r;
+	int n;
+
+	if(c < Runesync)		/* not part of utf sequence */
+		return strchr(s, c);
+
+	for(;;) {
+		c1 = *(uchar*)s;
+		if(c1 < Runeself) {	/* one byte rune */
+			if(c1 == 0)
+				return 0;
+			if(c1 == c)
+				return s;
+			s++;
+			continue;
+		}
+		n = chartorune(&r, s);
+		if(r == c)
+			return s;
+		s += n;
+	}
+	return 0;
+}