* enum.c (enum_take): get rid of extraneous iteration.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18727 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Wed Aug 20 22:24:48 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* enum.c (enum_take): get rid of extraneous iteration.
+
 Wed Aug 20 20:32:49 2008  Tanaka Akira  <akr@fsij.org>
 
 	* io.c (rb_io_open_with_args): use rb_open_file instead of rb_io_open.

enum.c

@@ -1585,8 +1585,8 @@ enum_zip(int argc, VALUE *argv, VALUE obj)
 static VALUE
 take_i(VALUE i, VALUE *arg, int argc, VALUE *argv)
 {
-    if (arg[1]-- == 0) rb_iter_break();
     rb_ary_push(arg[0], enum_values_pack(argc, argv));
+    if (--arg[1] == 0) rb_iter_break();
     return Qnil;
 }
 
@@ -1611,8 +1611,9 @@ enum_take(VALUE obj, VALUE n)
 	rb_raise(rb_eArgError, "attempt to take negative size");
     }
 
-    args[1] = len;
+    if (len == 0) return rb_ary_new2(0);
     args[0] = rb_ary_new();
+    args[1] = len;
     rb_block_call(obj, id_each, 0, 0, take_i, (VALUE)args);
     return args[0];
 }