1 files changed, 37 insertions, 0 deletions
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index 36ad9c8708..b91cd470ad 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -1,9 +1,46 @@
 #include "ruby.h"
 
 static VALUE rb_cPathname;
+static ID id_at_path, id_to_path;
+
+static VALUE
+get_strpath(VALUE obj)
+{
+    return rb_ivar_get(obj, id_at_path);
+}
+
+static void
+set_strpath(VALUE obj, VALUE val)
+{
+    rb_ivar_set(obj, id_at_path, val);
+}
+
+/*
+ * Create a Pathname object from the given String (or String-like object).
+ * If +path+ contains a NUL character (<tt>\0</tt>), an ArgumentError is raised.
+ */
+static VALUE
+path_initialize(VALUE self, VALUE arg)
+{
+    VALUE str;
+    str = rb_check_funcall(arg, id_to_path, 0, NULL);
+    if (str == Qundef)
+        str = arg;
+    StringValue(str);
+    if (memchr(RSTRING_PTR(str), '\0', RSTRING_LEN(str)))
+        rb_raise(rb_eArgError, "pathname contains null byte");
+    str = rb_obj_dup(str);
+
+    set_strpath(self, str);
+    OBJ_INFECT(self, str);
+}
 
 void
 Init_pathname()
 {
+    id_at_path = rb_intern("@path");
+    id_to_path = rb_intern("to_path");
+
     rb_cPathname = rb_define_class("Pathname", rb_cObject);
+    rb_define_method(rb_cPathname, "initialize", path_initialize, 1);
 }