#7909: the prefixes \\.\ and \\?\ indicate special Windows paths, do not try to manipulate them. See http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx for details.
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index a6bcca4..ee7ac67 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -71,6 +71,12 @@
else:
return ':'
+def _get_special(path):
+ if isinstance(path, bytes):
+ return (b'\\\\.\\', b'\\\\?\\')
+ else:
+ return ('\\\\.\\', '\\\\?\\')
+
# Normalize the case of a pathname and map slashes to backslashes.
# Other normalizations (such as optimizing '../' away) are not done
# (this is done by normpath).
@@ -524,6 +530,13 @@
"""Normalize path, eliminating double slashes, etc."""
sep = _get_sep(path)
dotdot = _get_dot(path) * 2
+ special_prefixes = _get_special(path)
+ if path.startswith(special_prefixes):
+ # in the case of paths with these prefixes:
+ # \\.\ -> device names
+ # \\?\ -> literal paths
+ # do not do any normalization, but return the path unchanged
+ return path
path = path.replace(_get_altsep(path), sep)
prefix, path = splitdrive(path)
diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index 0fd81b6..86e3eda 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -174,6 +174,9 @@
tester("ntpath.normpath('C:////a/b')", r'C:\a\b')
tester("ntpath.normpath('//machine/share//a/b')", r'\\machine\share\a\b')
+ tester("ntpath.normpath('\\\\.\\NUL')", r'\\.\NUL')
+ tester("ntpath.normpath('\\\\?\\D:/XY\\Z')", r'\\?\D:/XY\Z')
+
def test_expandvars(self):
with support.EnvironmentVarGuard() as env:
env.clear()
diff --git a/Misc/NEWS b/Misc/NEWS
index 768c7df..398f7db 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -15,6 +15,9 @@
Library
-------
+- Issue #7909: Do not touch paths with the special prefixes ``\\.\``
+ or ``\\?\`` in ntpath.normpath().
+
- Issue #1286: Allow using fileinput.FileInput as a context manager.
- Add lfu_cache() and lru_cache() decorators to the functools module.