From 5e9d7562ec2808c4835a7037759793c044028af4 Mon Sep 17 00:00:00 2001
From: Mark Florisson <markflorisson88@gmail.com>
Date: Tue, 30 Nov 2010 00:28:53 +0100
Subject: [PATCH] Changed bytes object ob_sval cast to unsigned char * to
 prevent a RuntimeError with "Invalid cast"

---
 Cython/Debugger/libcython.py | 5 ++++-
 Cython/Debugger/libpython.py | 5 +++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Cython/Debugger/libcython.py b/Cython/Debugger/libcython.py
index a6142ab5..07234e90 100644
--- a/Cython/Debugger/libcython.py
+++ b/Cython/Debugger/libcython.py
@@ -578,13 +578,16 @@ class CyCy(CythonCommand):
         cy next
         cy run
         cy cont
+        cy finish
         cy up
         cy down
+        cy select
         cy bt / cy backtrace
-        cy print
         cy list
+        cy print
         cy locals
         cy globals
+        cy exec
     """
     
     name = 'cy'
diff --git a/Cython/Debugger/libpython.py b/Cython/Debugger/libpython.py
index dfca4dda..66242cf8 100644
--- a/Cython/Debugger/libpython.py
+++ b/Cython/Debugger/libpython.py
@@ -48,6 +48,7 @@ from __future__ import with_statement
 import os
 import re
 import sys
+import struct
 import locale
 import atexit
 import warnings
@@ -1026,8 +1027,8 @@ class PyBytesObjectPtr(PyObjectPtr):
     def __str__(self):
         field_ob_size = self.field('ob_size')
         field_ob_sval = self.field('ob_sval')
-        char_ptr = field_ob_sval.address.cast(_type_unsigned_char_ptr)
-        return ''.join([chr(char_ptr[i]) for i in safe_range(field_ob_size)])
+        return ''.join(struct.pack('b', field_ob_sval[i]) 
+                           for i in safe_range(field_ob_size))
 
     def proxyval(self, visited):
         return str(self)
-- 
2.26.2