fix some stuff

lib/ffi/example/example.lua

@@ -55,6 +55,15 @@ if lib then
         
     end
     
+
+
+    fn = FFI.lookup(lib, "buff")
+    if(fn) then
+        local ptr = FFI.call(FFI.atomic(FFI.type.POINTER),{}, fn, {})
+        echo(FFI.string(ptr))
+        
+    end
+
    FFI.unloadAll()
 end
 echo("end the day")

lib/ffi/example/lib.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 
+char data[] = {'h', 'e','l', 'l', 'o'};
 
 typedef struct{
     char a;
@@ -31,4 +32,9 @@ void test_string(char* buff, const char* a)
 {
     sprintf(buff,"you say %s", a);
     printf("%s\n", buff);
+}
+
+char * buff()
+{
+    return data;
 }