diff --git a/Python/fileutils.c b/Python/fileutils.c
index 8993c8c..501cb8c 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -3,6 +3,40 @@
 #  include <windows.h>
 #endif
 
+#ifdef HAVE_LANGINFO_H
+#include <langinfo.h>
+#endif
+
+PyObject *
+_Py_device_encoding(int fd)
+{
+#if defined(MS_WINDOWS) || defined(MS_WIN64)
+    UINT cp;
+#endif
+    if (!_PyVerify_fd(fd) || !isatty(fd)) {
+        Py_RETURN_NONE;
+    }
+#if defined(MS_WINDOWS) || defined(MS_WIN64)
+    if (fd == 0)
+        cp = GetConsoleCP();
+    else if (fd == 1 || fd == 2)
+        cp = GetConsoleOutputCP();
+    else
+        cp = 0;
+    /* GetConsoleCP() and GetConsoleOutputCP() return 0 if the application
+       has no console */
+    if (cp != 0)
+        return PyUnicode_FromFormat("cp%u", (unsigned int)cp);
+#elif defined(CODESET)
+    {
+        char *codeset = nl_langinfo(CODESET);
+        if (codeset != NULL && codeset[0] != 0)
+            return PyUnicode_FromString(codeset);
+    }
+#endif
+    Py_RETURN_NONE;
+}
+
 #ifdef HAVE_STAT
 
 /* Decode a byte string from the locale encoding with the