chore: libunicode -> libutf

1 files changed, 32 insertions, 0 deletions

diff --git a/sys/libutf/findlast.c b/sys/libutf/findlast.c
new file mode 100644
index 0000000..ab25ab2
--- /dev/null
+++ b/sys/libutf/findlast.c
@@ -0,0 +1,32 @@
+#include "internal.h"
+
+byte*
+utf8·findlast(byte* s, rune c)
+{
+    long c1;
+    rune r;
+    byte *l;
+
+    if(c < Tx)
+        return strrchr(s, c);
+
+    l = nil;
+    for(;;){
+        c1 = *(ubyte*)s;
+        if(c1 < Tx){
+            if(c1 == 0) return l;
+            if(c1 == c) l = s;
+            s++;
+            continue;
+        }
+
+        c1 = utf8·decode(s, &r);
+
+        if(r == c)
+            l = s;
+
+        s += c1;
+    }
+
+    return nil;
+}