Expose meta_data_toc function.

This is useful for traversing all the meta data elements in a value list, since there is no element to look up the metadata object.

For example usage, see https://github.com/Stackdriver/collectd/pull/166

diff --git a/src/daemon/utils_cache.c b/src/daemon/utils_cache.c
index 672b01f101e81af90a774b255a64bef2992d9669..5e8cf75b619a3abbb9322fe57492061fccb54d75 100644 (file)
--- a/src/daemon/utils_cache.c
+++ b/src/daemon/utils_cache.c
@@ -1003,6 +1003,11 @@ int uc_meta_data_exists(const value_list_t *vl,
 
     int uc_meta_data_delete(const value_list_t *vl,
                             const char *key) UC_WRAP(meta_data_delete)
+
+/* The second argument is called `toc` in the API, but the macro expects
+ * `key`. */
+int uc_meta_data_toc(const value_list_t *vl, char ***key) UC_WRAP(meta_data_toc)
+
 #undef UC_WRAP
 
 /* We need a new version of this macro because the following functions take