schema tree NEW function for traversing union types

src/tree_schema.c

@@ -123,6 +123,18 @@ lys_is_disabled(const struct lys_node *node, int recursive)
     goto check;
 }
 
+API const struct lys_type *
+lys_getnext_union_type(const struct lys_type *last, const struct lys_type *type)
+{
+    int found = 0;
+
+    if (!type || (type->base != LY_TYPE_UNION)) {
+        retur NULL;
+    }
+
+    return lyp_get_next_union_type(type, last, &found);
+}
+
 int
 lys_get_sibling(const struct lys_node *siblings, const char *mod_name, int mod_name_len, const char *name,
                 int nam_len, LYS_NODE type, const struct lys_node **ret)

src/tree_schema.h

@@ -2290,6 +2290,15 @@ const struct lys_node *lys_getnext(const struct lys_node *last, const struct lys
 #define LYS_GETNEXT_NOSTATECHECK 0x100 /**< lys_getnext() option to skip checking module validity (import-only, disabled) and
                                             relevant if-feature conditions state */
 
+/**
+ * @brief Get next type of a union.
+ *
+ * @param[in] last Last returned type. NULL on first call.
+ * @param[in] type Union type structure.
+ * @return Next union type in order, NULL if all were returned or on error.
+ */
+const struct lys_type *lys_getnext_union_type(const struct lys_type *last, const struct lys_type *type);
+
 /**
  * @brief Search for schema nodes matching the provided path.
  *