Fix for #8879.

Amaury noticed that this was originally written in a way that would fail on
names that can't be encoded with the mbcs codec. Restructured the function
to work with wide names first then narrow names second, to fall in line
with the way other functions are written in posixmodule.c.

2 files changed, 23 insertions, 2 deletions

diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 978364c478..5a37522ad8 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -887,6 +887,11 @@ class LinkTests(unittest.TestCase):
         self._test_link(bytes(self.file1, sys.getfilesystemencoding()),
                         bytes(self.file2, sys.getfilesystemencoding()))
 
+    def test_mbcs_name(self):
+        self.file1 += "\u65e5\u672c"
+        self.file2 = self.file1 + "2"
+        self._test_link(self.file1, self.file2)
+
 if sys.platform != 'win32':
     class Win32ErrorTests(unittest.TestCase):
         pass
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 3197a0d2d8..48dbaa515c 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2252,6 +2252,22 @@ win32_link(PyObject *self, PyObject *args)
     char *src, *dst;
     BOOL rslt;
 
+    PyUnicodeObject *usrc, *udst;
+    if (PyArg_ParseTuple(args, "UU:link", &usrc, &udst)) {
+        Py_BEGIN_ALLOW_THREADS
+        rslt = CreateHardLinkW(PyUnicode_AS_UNICODE(udst),
+                               PyUnicode_AS_UNICODE(usrc), NULL);
+        Py_END_ALLOW_THREADS
+
+        if (rslt == 0)
+            return win32_error("link", NULL);
+
+        Py_RETURN_NONE;
+    }
+
+    /* Narrow strings also valid. */
+    PyErr_Clear();
+
     if (!PyArg_ParseTuple(args, "O&O&:link", PyUnicode_FSConverter, &osrc,
                           PyUnicode_FSConverter, &odst))
         return NULL;
@@ -2260,13 +2276,13 @@ win32_link(PyObject *self, PyObject *args)
     dst = PyBytes_AsString(odst);
 
     Py_BEGIN_ALLOW_THREADS
-    rslt = CreateHardLink(dst, src, NULL);
+    rslt = CreateHardLinkA(dst, src, NULL);
     Py_END_ALLOW_THREADS
 
     Py_DECREF(osrc);
     Py_DECREF(odst);
     if (rslt == 0)
-        return posix_error();
+        return win32_error("link", NULL);
 
     Py_RETURN_NONE;
 }