st.c: revert st_keys

* st.c: revert st_keys() at r43238.  VALUE cannot be in st.c.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 3 deletions

diff --git a/hash.c b/hash.c
index 2cedeefb10..83d179964f 100644
--- a/hash.c
+++ b/hash.c
@@ -1663,6 +1663,13 @@ rb_hash_to_h(VALUE hash)
     return hash;
 }
 
+static int
+keys_i(VALUE key, VALUE value, VALUE ary)
+{
+    rb_ary_push(ary, key);
+    return ST_CONTINUE;
+}
+
 /*
  *  call-seq:
  *     hsh.keys    -> array
@@ -1678,10 +1685,12 @@ rb_hash_to_h(VALUE hash)
 VALUE
 rb_hash_keys(VALUE hash)
 {
-    st_table *table = RHASH(hash)->ntbl;
+    VALUE ary;
+
+    ary = rb_ary_new_capa(RHASH_SIZE(hash));
+    rb_hash_foreach(hash, keys_i, ary);
 
-    if (!table) return rb_ary_new();
-    return st_keys(table);
+    return ary;
 }
 
 static int