From ad4a0cc519a5bb14204324e0e32e976318f9e6ce Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 7 Mar 2017 22:24:44 -0800
Subject: allow the first call to wcsxfrm to return ERANGE (#536)

If the output buffer provided to wcsxfrm is too small, errno is set to ERANGE. We should not error out in that case.
---
 Modules/_localemodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index f5c126a..ecd673e 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -262,7 +262,7 @@ PyLocale_strxfrm(PyObject* self, PyObject* args)
     }
     errno = 0;
     n2 = wcsxfrm(buf, s, n1);
-    if (errno) {
+    if (errno && errno != ERANGE) {
         PyErr_SetFromErrno(PyExc_OSError);
         goto exit;
     }
-- 
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