JSON: Add json_strdup()

diff --git a/ucw-json/json.h b/ucw-json/json.h
index f361c95b762d16a141515c749d339389a89e2bd5..f51dd6a7fe0f506aba60d36ef7b950e0ececa90b 100644 (file)
--- a/ucw-json/json.h
+++ b/ucw-json/json.h
@@ -99,6 +99,17 @@ void json_reset(struct json_context *js);
  **/
 void json_push(struct json_context *js);
 
+/**
+ * Create a copy of a string in JSON memory.
+ *
+ * For example, this is useful when you want to use a string of unknown
+ * lifetime as a key in json_object_set().
+ **/
+static inline const char *json_strdup(struct json_context *js, const char *str)
+{
+  return mp_strdup(js->pool, str);
+}
+
 /**
  * Pop state of the context off state stack. All JSON values created
  * since the state was saved by json_push() are released.
@@ -218,9 +229,7 @@ struct json_node *json_new_object(struct json_context *js);
  * and a pre-existing pair is deleted.
  *
  * The @key is referenced by the object, you must not free it during
- * the lifetime of the JSON context.
- *
- * FIXME: Add json_copy_key().
+ * the lifetime of the object. When in doubt, use json_strdup().
  **/
 void json_object_set(struct json_node *n, const char *key, struct json_node *value);