degesch: implement /server rename

common.c

@@ -70,6 +70,17 @@ str_vector_find (const struct str_vector *v, const char *s)
 	return -1;
 }
 
+static void *
+str_map_steal (struct str_map *self, const char *key)
+{
+	void *value = str_map_find (self, key);
+	void (*free_backup) (void *) = self->free;
+	self->free = NULL;
+	str_map_set (self, key, NULL);
+	self->free = free_backup;
+	return value;
+}
+
 // --- Logging -----------------------------------------------------------------
 
 static void