commit 110b6fecbbb86143a4acb568f50eab2c870e7d34
author R David Murray <rdmurray@bitdance.com> Thu Sep 08 15:34:08 2016 -0400
committer R David Murray <rdmurray@bitdance.com> Thu Sep 08 15:34:08 2016 -0400
tree ccc11fe14604c7c08bb750b392f67559a3cfd962
parent 186122ead26f3ae4c2bc9f6715d2a29d339fdc5a

#27364: Deprecate invalid escape strings in str/byutes.

Patch by Emanuel Barry, reviewed by Serhiy Storchaka and Martin Panter.

Objects/bytesobject.c

diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index b0d9b39..6e7c4fa 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1207,8 +1207,9 @@
             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. */
         }

Objects/unicodeobject.c

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 7979eec..e0c3bfe 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6065,6 +6065,9 @@
             goto error;
 
         default:
+            if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
+                                 "invalid escape sequence '\\%c'", c) < 0)
+                goto onError;
             WRITE_ASCII_CHAR('\\');
             WRITE_CHAR(c);
             continue;