From 110b6fecbbb86143a4acb568f50eab2c870e7d34 Mon Sep 17 00:00:00 2001
From: R David Murray <rdmurray@bitdance.com>
Date: Thu, 8 Sep 2016 15:34:08 -0400
Subject: #27364: Deprecate invalid escape strings in str/byutes.

Patch by Emanuel Barry, reviewed by Serhiy Storchaka and Martin Panter.
---
 Objects/bytesobject.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Objects/bytesobject.c')

diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index b0d9b39825..6e7c4fa188 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1207,8 +1207,9 @@ PyObject *PyBytes_DecodeEscape(const char *s,
             break;
 
         default:
+            if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, "invalid escape sequence '\\%c'", *(--s)) < 0)
+                goto failed;
             *p++ = '\\';
-            s--;
             goto non_esc; /* an arbitrary number of unescaped
                              UTF-8 bytes may follow. */
         }
-- 
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