- vertical = strappenda(prefix, draw_special_char(DRAW_TREE_VERTICAL));
- space = strappenda(prefix, draw_special_char(DRAW_TREE_SPACE));
+ vertical = strjoina(prefix, draw_special_char(DRAW_TREE_VERTICAL));
+ space = strjoina(prefix, draw_special_char(DRAW_TREE_SPACE));