diff --git a/src/libbio/bgetrune.c b/src/libbio/bgetrune.c
new file mode 100644
index 0000000..f1b065b
--- /dev/null
+++ b/src/libbio/bgetrune.c
@@ -0,0 +1,47 @@
+#include	"lib9.h"
+#include	<bio.h>
+#include	<utf.h>
+
+long
+Bgetrune(Biobuf *bp)
+{
+	int c, i;
+	Rune rune;
+	char str[4];
+
+	c = Bgetc(bp);
+	if(c < Runeself) {		/* one char */
+		bp->runesize = 1;
+		return c;
+	}
+	str[0] = c;
+
+	for(i=1;;) {
+		c = Bgetc(bp);
+		if(c < 0)
+			return c;
+		str[i++] = c;
+
+		if(fullrune(str, i)) {
+			bp->runesize = chartorune(&rune, str);
+			while(i > bp->runesize) {
+				Bungetc(bp);
+				i--;
+			}
+			return rune;
+		}
+	}
+}
+
+int
+Bungetrune(Biobuf *bp)
+{
+
+	if(bp->state == Bracteof)
+		bp->state = Bractive;
+	if(bp->state != Bractive)
+		return Beof;
+	bp->icount -= bp->runesize;
+	bp->runesize = 0;
+	return 1;
+}