1 files changed, 20 insertions, 0 deletions
diff --git a/sys/libunicode/canfit.c b/sys/libunicode/canfit.c
new file mode 100644
index 0000000..d44c9e6
--- /dev/null
+++ b/sys/libunicode/canfit.c
@@ -0,0 +1,20 @@
+#include "internal.h"
+
+/* returns 1 if string of length n is long enough to be decoded */
+int
+utf8·canfit(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;
+}