Add bt_ctf_field_variant_get_tag

[babeltrace.git] / formats / ctf / ir / fields.c

diff --git a/formats/ctf/ir/fields.c b/formats/ctf/ir/fields.c
index 105dd7a1dbe737317a3114c08a9f617710c55c8a..2aeb71b53ba0880eeb05c1a20d7d69a90a165024 100644 (file)
--- a/formats/ctf/ir/fields.c
+++ b/formats/ctf/ir/fields.c
@@ -788,6 +788,27 @@ end:
        return current_field;
 }
 
+struct bt_ctf_field *bt_ctf_field_variant_get_tag(
+               struct bt_ctf_field *variant_field)
+{
+       struct bt_ctf_field *tag = NULL;
+       struct bt_ctf_field_variant *variant;
+
+       if (!variant_field ||
+                       bt_ctf_field_type_get_type_id(variant_field->type) !=
+                       BT_CTF_TYPE_ID_VARIANT) {
+               goto end;
+       }
+
+       variant = container_of(variant_field, struct bt_ctf_field_variant,
+                       parent);
+       if (variant->tag) {
+               tag = bt_get(variant->tag);
+       }
+end:
+       return tag;
+}
+
 struct bt_ctf_field *bt_ctf_field_enumeration_get_container(
        struct bt_ctf_field *field)
 {