Recycle conses in unget-char and read-until-match.

* regex.c (ead_until_match): Use rcyc_pop instead of pop
to move the conses to the recycle list. We know these
are not shared with anything. Adding additional logic
to completely recycle the stack.

* socket.c (dgram_get_char): Use rcyc_pop to
get the character from the push-back list.

* stream.c (stdio_get_char): Likewise.

1 files changed, 7 insertions, 3 deletions

diff --git a/regex.c b/regex.c
index e8de118c..faf38965 100644
--- a/regex.c
+++ b/regex.c
@@ -2554,7 +2554,7 @@ val read_until_match(val regex, val stream_in, val include_match_in)
         goto out_match;
 
       while (stack)
-        unget_char(pop(&stack), stream);
+        unget_char(rcyc_pop(&stack), stream);
 
       ch = get_char(stream);
 
@@ -2580,14 +2580,18 @@ val read_until_match(val regex, val stream_in, val include_match_in)
   if (nil) {
 out_match:
     while (stack != match)
-      unget_char(pop(&stack), stream);
+      unget_char(rcyc_pop(&stack), stream);
     if (!out)
       out = null_string;
     if (include_match)
-      out = cat_str(cons(out, nreverse(stack)), nil);
+      out = cat_str(cons(out, stack = nreverse(stack)), nil);
   }
 
   regex_machine_cleanup(&regm);
+
+  while (stack)
+    rcyc_pop(&stack);
+
   return out;
 }