Add T_PYSSIZET in structmember.h: This can be used for

Py_ssize_t members.

Simplify the implementation of UnicodeError objects:
start and end attributes are now stored directly as
Py_ssize_t members, which simplifies various get and
set functions.

Include/pyerrors.h

@@ -34,8 +34,8 @@ typedef struct {
     PyObject *message;
     PyObject *encoding;
     PyObject *object;
-    PyObject *start;
-    PyObject *end;
+    Py_ssize_t start;
+    Py_ssize_t end;
     PyObject *reason;
 } PyUnicodeErrorObject;
 #endif

Include/structmember.h

@@ -68,6 +68,7 @@ typedef struct PyMemberDef {
 #ifdef HAVE_LONG_LONG
 #define T_LONGLONG      17  
 #define T_ULONGLONG      18
+#define T_PYSSIZET       19 /* Py_ssize_t */
 #endif /* HAVE_LONG_LONG */
 
 /* Flags */

Misc/NEWS

@@ -14,6 +14,8 @@ Core and builtins
 
 - Patch #1733960: Allow T_LONGLONG to accept ints.
 
+- T_PYSSIZET can now be used in PyMemberDef lists for Py_ssize_t members.
+
 - Prevent expandtabs() on string and unicode objects from causing a segfault
   when a large width is passed on 32-bit platforms.
 
@@ -687,6 +689,9 @@ Library
 - Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
   first chunk fed to the decoder started with a BOM, but was longer than 3 bytes.
 
+- The implementation of UnicodeError objects has been simplified (start and end
+  attributes are now stored directly as Py_ssize_t members).
+
 Extension Modules
 -----------------
 

Python/structmember.c

@@ -85,6 +85,9 @@ PyMember_GetOne(const char *addr, PyMemberDef *l)
 	case T_ULONG:
 		v = PyLong_FromUnsignedLong(*(unsigned long*)addr);
 		break;
+	case T_PYSSIZET:
+		v = PyInt_FromSsize_t(*(Py_ssize_t*)addr);
+		break;
 	case T_FLOAT:
 		v = PyFloat_FromDouble((double)*(float*)addr);
 		break;
@@ -263,6 +266,13 @@ PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
 		}
 		break;
 		}
+	case T_PYSSIZET:{
+		*(Py_ssize_t*)addr = PyInt_AsSsize_t(v);
+		if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)
+		    && PyErr_Occurred())
+				return -1;
+		break;
+		}
 	case T_FLOAT:{
 		double double_val;
 		double_val = PyFloat_AsDouble(v);