(untested) don't use deprecated "u" in PyArg_ParseTuple()

1 files changed, 10 insertions, 3 deletions

diff --git a/c/_cffi_backend.c b/c/_cffi_backend.c
index f647d39..6f2f59e 100644
--- a/c/_cffi_backend.c
+++ b/c/_cffi_backend.c
@@ -4451,8 +4451,8 @@ static void *b_do_dlopen(PyObject *args, const char **p_printable_filename,
     {
         PyObject *s = PyTuple_GET_ITEM(args, 0);
 #ifdef MS_WIN32
-        Py_UNICODE *filenameW;
-        if (PyArg_ParseTuple(args, "u|i:load_library", &filenameW, &flags))
+        PyObject *filename_unicode;
+        if (PyArg_ParseTuple(args, "U|i:load_library", &filename_unicode, &flags))
         {
 #if PY_MAJOR_VERSION < 3
             s = PyUnicode_AsUTF8String(s);
@@ -4464,7 +4464,14 @@ static void *b_do_dlopen(PyObject *args, const char **p_printable_filename,
             if (*p_printable_filename == NULL)
                 return NULL;
 
-            handle = dlopenW(filenameW);
+            Py_ssize_t sz1 = PyUnicode_GetSize(filename_unicode) + 1;
+            sz1 *= 2;   /* should not be needed, but you never know */
+            wchar_t *w1 = alloca(sizeof(wchar_t) * sz1);
+            sz1 = PyUnicode_AsWideChar(filename_unicode, w1, sz1 - 1);
+            if (sz1 < 0)
+                return NULL;
+            w1[sz1] = 0;
+            handle = dlopenW(w1);
             goto got_handle;
         }
         PyErr_Clear();