commit 27f32e938ff51fd5d90a29abbbabc6b81d156f33
author Anthony Sottile <asottile@umich.edu> Mon Jan 15 13:39:04 2018 -0800
committer Serhiy Storchaka <storchaka@gmail.com> Mon Jan 15 23:39:04 2018 +0200
tree 4f119ab169d8ce36474fd1e877553a8395704329
parent ab95b3074ee43098edf3f23b07fb18ef57ee614d

bpo-32539: Fix OSError for os.listdir() for extended-length paths on Windows (#5169)

See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx?f=255&MSPPError=-2147217396#maxpath

Paths that begin with `\\?\` are "extended-length paths".

Modules/posixmodule.c

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index c9886d5..cecbb45 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2385,7 +2385,7 @@
     if (len > 0) {
         char ch = namebuf[len-1];
         if (ch != SEP && ch != ALTSEP && ch != ':')
-            namebuf[len++] = '/';
+            namebuf[len++] = SEP;
         strcpy(namebuf + len, "*.*");
     }