Feat(libunicode): cleaned up decode/encode

Additionally, decode can now apply backwards on a byte string.

1 files changed, 10 insertions, 7 deletions

diff --git a/sys/libunicode/canfit.c b/sys/libunicode/canfit.c
index d44c9e6..4579ab3 100644
--- a/sys/libunicode/canfit.c
+++ b/sys/libunicode/canfit.c
@@ -7,14 +7,17 @@ utf8·canfit(byte* s, int n)
     int  i;
     rune c;
 
-    if(n <= 0) return 0;
-    c = *(ubyte*) s;
-    if(c < Tx) return 1;
+    if(n <= 0)
+        return 0;
 
-    for(i = 3; i < UTFmax + 1; i++){
-        if(c < Tbyte(i))
-            return n >= i - 1;
-    }
+    c = *(ubyte*)s;
+    if(c < TByte1)
+        return 1;
+
+    if(c < TByte3)
+        return n >= 2;
+    if(c < TByte4)
+        return n >= 3;
 
     return n >= UTFmax;
 }