os.path: Add dummy normpath() & join(), working split().

os.path/os/path.py

@@ -1,2 +1,20 @@
 def normcase(s):
     return s
+
+def normpath(s):
+    return s
+
+def join(*args):
+    # TODO: this is non-compliant
+    return "/".join(args)
+
+def split(path):
+    if path == "":
+        return ("", "")
+    r = path.rsplit("/", 1)
+    if len(r) == 1:
+        return ("", path)
+    head = r[0] #.rstrip("/")
+    if not head:
+        head = "/"
+    return (head, r[1])

os.path/test_path.py

@@ -0,0 +1,8 @@
+from os.path import *
+
+assert split("") == ("", "")
+assert split("path") == ("", "path")
+assert split("/") == ("/", "")
+assert split("/foo") == ("/", "foo")
+assert split("/foo/") == ("/foo", "")
+assert split("/foo/bar") == ("/foo", "bar")