merges r23549 from trunk into ruby_1_9_1.

--
* ext/dl/cptr.c (rb_dlptr_cmp): return signed value, and restrict
  to Fixnum.  [ruby-dev:38533]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@23756 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 4 deletions

diff --git a/ext/dl/cptr.c b/ext/dl/cptr.c
index 3c08e68cd..dbe93308b 100644
--- a/ext/dl/cptr.c
+++ b/ext/dl/cptr.c
@@ -317,10 +317,13 @@ rb_dlptr_eql(VALUE self, VALUE other)
 VALUE
 rb_dlptr_cmp(VALUE self, VALUE other)
 {
-  void *ptr1, *ptr2;
-  ptr1 = rb_dlptr2cptr(self);
-  ptr2 = rb_dlptr2cptr(other);
-  return PTR2NUM((long)ptr1 - (long)ptr2);
+    void *ptr1, *ptr2;
+    SIGNED_VALUE diff;
+    ptr1 = rb_dlptr2cptr(self);
+    ptr2 = rb_dlptr2cptr(other);
+    diff = (SIGNED_VALUE)ptr1 - (SIGNED_VALUE)ptr2;
+    if (!diff) return INT2FIX(0);
+    return diff > 0 ? INT2NUM(1) : INT2NUM(-1);
 }
 
 VALUE