1 files changed, 18 insertions, 0 deletions
diff --git a/sys/libunicode/fullrune.c b/sys/libunicode/fullrune.c
new file mode 100644
index 0000000..e5cf314
--- /dev/null
+++ b/sys/libunicode/fullrune.c
@@ -0,0 +1,18 @@
+#include "internal.h"
+
+int
+utf8·fullrune(byte* s, int n)
+{
+    int  i;
+    rune c;
+
+    if (n <= 0) return 0;
+    c = *(ubyte*) s;
+    if (c < Tx) return 1;
+
+    for (i = 3; i < UTFmax + 1; i++) {
+        if (c < Tbyte(i)) return n >= i - 1;
+    }
+
+    return n >= UTFmax;
+}