From 8c6db45d3e8a20cabe50f93b2bbc33b0040af5a3 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Sat, 6 Oct 2012 00:40:45 +0200
Subject: In debug mode, unicode_write_cstr() now checks that non-ASCII
 characters are not written into an ASCII string

---
 Objects/unicodeobject.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index daeb4b4..84bbf9a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1700,6 +1700,14 @@ unicode_write_cstr(PyObject *unicode, Py_ssize_t index,
     switch (kind) {
     case PyUnicode_1BYTE_KIND: {
         assert(index + len <= PyUnicode_GET_LENGTH(unicode));
+#ifdef Py_DEBUG
+        if (PyUnicode_IS_ASCII(unicode)) {
+            Py_UCS4 maxchar = ucs1lib_find_max_char(
+                (const Py_UCS1*)str,
+                (const Py_UCS1*)str + len);
+            assert(maxchar < 128);
+        }
+#endif
         memcpy((char *) data + index, str, len);
         break;
     }
-- 
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