* array.c (rb_ary_cycle): avoid infinite loop for empty array.

  based on a patch from David Flanagan.  [ruby-core:12085]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@13424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 6 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 9c5f3fe10..440d70f72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Sep 10 13:44:37 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* array.c (rb_ary_cycle): avoid infinite loop for empty array.
+	  based on a patch from David Flanagan.  [ruby-core:12085]
+
 Mon Sep 10 01:21:23 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* marshal.c (r_object0): struct allocation first to check if a
diff --git a/array.c b/array.c
index 3b9a294d9..6ab12a4d7 100644
--- a/array.c
+++ b/array.c
@@ -2939,7 +2939,7 @@ rb_ary_cycle(VALUE ary)
     long i;
 
     RETURN_ENUMERATOR(ary, 0, 0);
-    for (;;) {
+    while (RARRAY_LEN(ary) > 0) {
 	for (i=0; i<RARRAY_LEN(ary); i++) {
 	    rb_yield(RARRAY_PTR(ary)[i]);
 	}