diff -r b5402859dfad -r 534387caf43d targets/var_access.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/var_access.c	Mon Aug 26 08:54:02 2019 +0200
@@ -0,0 +1,33 @@
+
+#define __Unpack_case_t(TYPENAME) \
+        case TYPENAME##_ENUM :\
+            *flags = ((__IEC_##TYPENAME##_t *)varp)->flags;\
+            forced_value_p = *real_value_p = &((__IEC_##TYPENAME##_t *)varp)->value;\
+            break;
+
+#define __Unpack_case_p(TYPENAME)\
+        case TYPENAME##_O_ENUM :\
+            *flags = __IEC_OUTPUT_FLAG;\
+        case TYPENAME##_P_ENUM :\
+            *flags |= ((__IEC_##TYPENAME##_p *)varp)->flags;\
+            *real_value_p = ((__IEC_##TYPENAME##_p *)varp)->value;\
+            forced_value_p = &((__IEC_##TYPENAME##_p *)varp)->fvalue;\
+            break;
+
+static void* UnpackVar(__Unpack_desc_type *dsc, void **real_value_p, char *flags)
+{
+    void *varp = dsc->ptr;
+    void *forced_value_p = NULL;
+    *flags = 0;
+    /* find data to copy*/
+    switch(dsc->type){
+        __ANY(__Unpack_case_t)
+        __ANY(__Unpack_case_p)
+    default:
+        break;
+    }
+    if (*flags & __IEC_FORCE_FLAG)
+        return forced_value_p;
+    return *real_value_p;
+}
+