Use struct instead of cons for lazy string fields.

* gc.c (finalize): Must free the dynamic structure attached
to the LSTR type now.
(mark_obj): Must mark interior of LSTR type's props structure.

* lib.c (lazy_sub_str, copy_lazy_str): Copy props structure.
(lazy_str): Allocate and initialize props structure.
(lazy_str_force, lazy_str_put, lazy_str_force_upto,
lazy_str_get_trailing_list, out_lazy_str): Follow
representation change.

* lib.h (struct lazy_string_props): New struct type.
(strut lazy_string): Member opts replaced with props
pointer to struct lazy_string_props.

1 files changed, 7 insertions, 1 deletions

diff --git a/lib.h b/lib.h
index 7b2a4f0f..93ab96bb 100644
--- a/lib.h
+++ b/lib.h
@@ -201,11 +201,17 @@ struct lazy_cons {
  * Lazy string: virtual string which dynamically grows as a catentation
  * of a list of strings.
  */
+
+struct lazy_string_props {
+  val term;
+  val limit;
+};
+
 struct lazy_string {
   obj_common;
   val prefix;           /* actual string part */
   val list;             /* remaining list */
-  val opts;             /* ( separator . limit ) */
+  struct lazy_string_props *props;
 };
 
 struct cobj {