* ext/dl/cptr.c (rb_dlptr_size) splitting function to reduce complexity

* ext/dl/cptr.c (rb_dlptr_null_p, rb_dlptr_aref, rb_dlptr_aset) adding
  documentation
* ext/dl/dl.c (rb_dl_free) adding documentation
* test/dl/test_cptr.rb (test_null?, test_size, test_size=,
  test_aref_aset) Improving test coverage
* test/dl/test_dl2.rb (test_free_secure) improving test coverage

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25606 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/dl/cptr.c

@@ -223,6 +223,11 @@ rb_dlptr_ref(VALUE self)
     return rb_dlptr_new(&(data->ptr),0,0);
 }
 
+/*
+ * call-seq: null?
+ *
+ * Returns true if this is a null pointer.
+ */
 VALUE
 rb_dlptr_null_p(VALUE self)
 {
@@ -357,6 +362,15 @@ rb_dlptr_minus(VALUE self, VALUE other)
     return rb_dlptr_new((char *)ptr - num, size + num, 0);
 }
 
+/*
+ *  call-seq:
+ *     ptr[index]                -> an_integer
+ *     ptr[start, length]        -> a_string
+ *
+ * Returns integer stored at _index_.  If _start_ and _length_ are given,
+ * a string containing the bytes from _start_ of length _length_ will be
+ * returned.
+ */
 VALUE
 rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
 {
@@ -380,6 +394,15 @@ rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
     return retval;
 }
 
+/*
+ *  call-seq:
+ *     ptr[index]         = int                    ->  int
+ *     ptr[start, length] = string or cptr or addr ->  string or dl_cptr or addr
+ *
+ * Set the value at +index+ to +int+.  Or, set the memory at +start+ until
+ * +length+ with the contents of +string+, the memory from +dl_cptr+, or the
+ * memory pointed at by the memory address +addr+.
+ */
 VALUE
 rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
 {
@@ -415,18 +438,27 @@ rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
     return retval;
 }
 
-VALUE
-rb_dlptr_size(int argc, VALUE argv[], VALUE self)
+/*
+ * call-seq: size=(size)
+ *
+ * Set the size of this pointer to +size+
+ */
+static VALUE
+rb_dlptr_size_set(VALUE self, VALUE size)
 {
-    VALUE size;
-
-    if (rb_scan_args(argc, argv, "01", &size) == 0){
-	return LONG2NUM(RPTR_DATA(self)->size);
-    }
-    else{
     RPTR_DATA(self)->size = NUM2LONG(size);
     return size;
-    }
+}
+
+/*
+ * call-seq: size
+ *
+ * Get the size of this pointer.
+ */
+static VALUE
+rb_dlptr_size_get(VALUE self)
+{
+    return LONG2NUM(RPTR_DATA(self)->size);
 }
 
 VALUE
@@ -491,8 +523,8 @@ Init_dlptr(void)
     rb_define_method(rb_cDLCPtr, "-", rb_dlptr_minus, 1);
     rb_define_method(rb_cDLCPtr, "[]", rb_dlptr_aref, -1);
     rb_define_method(rb_cDLCPtr, "[]=", rb_dlptr_aset, -1);
-    rb_define_method(rb_cDLCPtr, "size", rb_dlptr_size, -1);
-    rb_define_method(rb_cDLCPtr, "size=", rb_dlptr_size, -1);
+    rb_define_method(rb_cDLCPtr, "size", rb_dlptr_size_get, 0);
+    rb_define_method(rb_cDLCPtr, "size=", rb_dlptr_size_set, 1);
 
     rb_define_const(rb_mDL, "NULL", rb_dlptr_new(0, 0, 0));
 }

ext/dl/dl.c

@@ -49,6 +49,11 @@ rb_dl_realloc(VALUE self, VALUE addr, VALUE size)
     return PTR2NUM(ptr);
 }
 
+/*
+ * call-seq: DL.free(addr)
+ *
+ * Free the memory at address +addr+
+ */
 VALUE
 rb_dl_free(VALUE self, VALUE addr)
 {

test/dl/test_cptr.rb

@@ -29,5 +29,57 @@ module DL
 
       assert_equal free.ptr, ptr.free.ptr
     end
+
+    def test_null?
+      ptr = CPtr.new(0)
+      assert ptr.null?
+    end
+
+    def test_size
+      ptr = CPtr.malloc(4)
+      assert_equal 4, ptr.size
+      DL.free ptr.to_i
+    end
+
+    def test_size=
+      ptr = CPtr.malloc(4)
+      ptr.size = 10
+      assert_equal 10, ptr.size
+      DL.free ptr.to_i
+    end
+
+    def test_aref_aset
+      check = Proc.new{|str,ptr|
+        assert_equal(str.size(), ptr.size())
+        assert_equal(str, ptr.to_s())
+        assert_equal(str[0,2], ptr.to_s(2))
+        assert_equal(str[0,2], ptr[0,2])
+        assert_equal(str[1,2], ptr[1,2])
+        assert_equal(str[1,0], ptr[1,0])
+        assert_equal(str[0].ord, ptr[0])
+        assert_equal(str[1].ord, ptr[1])
+      }
+      str = 'abc'
+      ptr = CPtr[str]
+      check.call(str, ptr)
+
+      str[0] = "c"
+      assert_equal 'c'.ord, ptr[0] = "c".ord
+      check.call(str, ptr)
+
+      str[0,2] = "aa"
+      assert_equal 'aa', ptr[0,2] = "aa"
+      check.call(str, ptr)
+
+      ptr2 = CPtr['cdeeee']
+      str[0,2] = "cd"
+      assert_equal ptr2, ptr[0,2] = ptr2
+      check.call(str, ptr)
+
+      ptr3 = CPtr['vvvv']
+      str[0,2] = "vv"
+      assert_equal ptr3.to_i, ptr[0,2] = ptr3.to_i
+      check.call(str, ptr)
+    end
   end
 end

test/dl/test_dl2.rb

@@ -5,6 +5,15 @@ module DL
 class TestDL < TestBase
   # TODO: refactor test repetition
 
+  def test_free_secure
+    assert_raises(SecurityError) do
+      Thread.new do
+        $SAFE = 4
+        DL.free(0)
+      end.join
+    end
+  end
+
   def test_realloc
     str = "abc"
     ptr_id = DL.realloc(0, 4)
@@ -133,27 +142,5 @@ class TestDL < TestBase
     ary2 = dlunwrap(addr)
     assert_equal(ary, ary2)
   end
-
-  def test_cptr()
-    check = Proc.new{|str,ptr|
-      assert_equal(str.size(), ptr.size())
-      assert_equal(str, ptr.to_s())
-      assert_equal(str[0,2], ptr.to_s(2))
-      assert_equal(str[0,2], ptr[0,2])
-      assert_equal(str[1,2], ptr[1,2])
-      assert_equal(str[1,0], ptr[1,0])
-      assert_equal(str[0].ord, ptr[0])
-      assert_equal(str[1].ord, ptr[1])
-    }
-    str = 'abc'
-    ptr = CPtr[str]
-    check.call(str, ptr)
-    str[0] = "c"
-    ptr[0] = "c".ord
-    check.call(str, ptr)
-    str[0,2] = "aa"
-    ptr[0,2] = "aa"
-    check.call(str, ptr)
-  end
 end
 end # module DL