diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 362294f..4f607d6 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -405,7 +405,7 @@
 	int supplied_flags = 0;
 	PyCompilerFlags cf;
 	PyObject *result = NULL, *cmd, *tmp = NULL;
-	int length;
+	Py_ssize_t length;
 
 	if (!PyArg_ParseTuple(args, "Oss|ii:compile", &cmd, &filename,
 			      &startstr, &supplied_flags, &dont_inherit))
@@ -824,7 +824,7 @@
 
 	PyObject *func, *result;
 	sequence *seqs = NULL, *sqp;
-	int n, len;
+	Py_ssize_t n, len;
 	register int i, j;
 
 	n = PyTuple_Size(args);
@@ -1163,12 +1163,12 @@
 static PyObject *
 builtin_len(PyObject *self, PyObject *v)
 {
-	long res;
+	Py_ssize_t res;
 
 	res = PyObject_Size(v);
 	if (res < 0 && PyErr_Occurred())
 		return NULL;
-	return PyInt_FromLong(res);
+	return PyInt_FromSsize_t(res);
 }
 
 PyDoc_STRVAR(len_doc,
@@ -2346,8 +2346,8 @@
 filtertuple(PyObject *func, PyObject *tuple)
 {
 	PyObject *result;
-	register int i, j;
-	int len = PyTuple_Size(tuple);
+	Py_ssize_t i, j;
+	Py_ssize_t len = PyTuple_Size(tuple);
 
 	if (len == 0) {
 		if (PyTuple_CheckExact(tuple))
@@ -2417,9 +2417,9 @@
 filterstring(PyObject *func, PyObject *strobj)
 {
 	PyObject *result;
-	register int i, j;
-	int len = PyString_Size(strobj);
-	int outlen = len;
+	Py_ssize_t i, j;
+	Py_ssize_t len = PyString_Size(strobj);
+	Py_ssize_t outlen = len;
 
 	if (func == Py_None) {
 		/* If it's a real string we can return the original,
diff --git a/Python/ceval.c b/Python/ceval.c
index 501a9a0..0f2b173 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -599,7 +599,7 @@
 
 /* Code access macros */
 
-#define INSTR_OFFSET()	(next_instr - first_instr)
+#define INSTR_OFFSET()	((int)(next_instr - first_instr))
 #define NEXTOP()	(*next_instr++)
 #define NEXTARG()	(next_instr += 2, (next_instr[-1]<<8) + next_instr[-2])
 #define PEEKARG()	((next_instr[2]<<8) + next_instr[1])
@@ -637,7 +637,9 @@
 
 /* Stack manipulation macros */
 
-#define STACK_LEVEL()	(stack_pointer - f->f_valuestack)
+/* The stack can grow at most MAXINT deep, as co_nlocals and
+   co_stacksize are ints. */
+#define STACK_LEVEL()	((int)(stack_pointer - f->f_valuestack))
 #define EMPTY()		(STACK_LEVEL() == 0)
 #define TOP()		(stack_pointer[-1])
 #define SECOND()	(stack_pointer[-2])
@@ -3857,7 +3859,7 @@
    called by the SLICE opcode with v and/or w equal to NULL.
 */
 int
-_PyEval_SliceIndex(PyObject *v, int *pi)
+_PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi)
 {
 	if (v != NULL) {
 		long x;
@@ -3906,6 +3908,7 @@
 			return 0;
 		}
 		/* Truncate -- very long indices are truncated anyway */
+		/* XXX truncate by ssize maximum */
 		if (x > INT_MAX)
 			x = INT_MAX;
 		else if (x < -INT_MAX)
@@ -3925,7 +3928,7 @@
 	PySequenceMethods *sq = tp->tp_as_sequence;
 
 	if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {
-		int ilow = 0, ihigh = INT_MAX;
+		Py_ssize_t ilow = 0, ihigh = INT_MAX;
 		if (!_PyEval_SliceIndex(v, &ilow))
 			return NULL;
 		if (!_PyEval_SliceIndex(w, &ihigh))
@@ -3952,7 +3955,7 @@
 	PySequenceMethods *sq = tp->tp_as_sequence;
 
 	if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {
-		int ilow = 0, ihigh = INT_MAX;
+		Py_ssize_t ilow = 0, ihigh = INT_MAX;
 		if (!_PyEval_SliceIndex(v, &ilow))
 			return -1;
 		if (!_PyEval_SliceIndex(w, &ihigh))
diff --git a/Python/codecs.c b/Python/codecs.c
index 5c521fb..2fcd6c5 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -460,7 +460,7 @@
 #ifdef Py_USING_UNICODE
 PyObject *PyCodec_IgnoreErrors(PyObject *exc)
 {
-    int end;
+    Py_ssize_t end;
     if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
 	if (PyUnicodeEncodeError_GetEnd(exc, &end))
 	    return NULL;
@@ -478,16 +478,16 @@
 	return NULL;
     }
     /* ouch: passing NULL, 0, pos gives None instead of u'' */
-    return Py_BuildValue("(u#i)", &end, 0, end);
+    return Py_BuildValue("(u#n)", &end, 0, end);
 }
 
 
 PyObject *PyCodec_ReplaceErrors(PyObject *exc)
 {
     PyObject *restuple;
-    int start;
-    int end;
-    int i;
+    Py_ssize_t start;
+    Py_ssize_t end;
+    Py_ssize_t i;
 
     if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
 	PyObject *res;
@@ -502,7 +502,7 @@
 	for (p = PyUnicode_AS_UNICODE(res), i = start;
 	    i<end; ++p, ++i)
 	    *p = '?';
-	restuple = Py_BuildValue("(Oi)", res, end);
+	restuple = Py_BuildValue("(On)", res, end);
 	Py_DECREF(res);
 	return restuple;
     }
@@ -510,7 +510,7 @@
 	Py_UNICODE res = Py_UNICODE_REPLACEMENT_CHARACTER;
 	if (PyUnicodeDecodeError_GetEnd(exc, &end))
 	    return NULL;
-	return Py_BuildValue("(u#i)", &res, 1, end);
+	return Py_BuildValue("(u#n)", &res, 1, end);
     }
     else if (PyObject_IsInstance(exc, PyExc_UnicodeTranslateError)) {
 	PyObject *res;
@@ -525,7 +525,7 @@
 	for (p = PyUnicode_AS_UNICODE(res), i = start;
 	    i<end; ++p, ++i)
 	    *p = Py_UNICODE_REPLACEMENT_CHARACTER;
-	restuple = Py_BuildValue("(Oi)", res, end);
+	restuple = Py_BuildValue("(On)", res, end);
 	Py_DECREF(res);
 	return restuple;
     }
@@ -540,8 +540,8 @@
     if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
 	PyObject *restuple;
 	PyObject *object;
-	int start;
-	int end;
+	Py_ssize_t start;
+	Py_ssize_t end;
 	PyObject *res;
 	Py_UNICODE *p;
 	Py_UNICODE *startp;
@@ -631,7 +631,7 @@
 	    }
 	    *outp++ = ';';
 	}
-	restuple = Py_BuildValue("(Oi)", res, end);
+	restuple = Py_BuildValue("(On)", res, end);
 	Py_DECREF(res);
 	Py_DECREF(object);
 	return restuple;
@@ -652,8 +652,8 @@
     if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
 	PyObject *restuple;
 	PyObject *object;
-	int start;
-	int end;
+	Py_ssize_t start;
+	Py_ssize_t end;
 	PyObject *res;
 	Py_UNICODE *p;
 	Py_UNICODE *startp;
@@ -708,7 +708,7 @@
 	    *outp++ = hexdigits[c&0xf];
 	}
 
-	restuple = Py_BuildValue("(Oi)", res, end);
+	restuple = Py_BuildValue("(On)", res, end);
 	Py_DECREF(res);
 	Py_DECREF(object);
 	return restuple;
diff --git a/Python/compile.c b/Python/compile.c
index 0754ea5..e743168 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -317,7 +317,7 @@
 static PyObject *
 list2dict(PyObject *list)
 {
-	int i, n;
+	Py_ssize_t i, n;
 	PyObject *v, *k, *dict = PyDict_New();
 
 	n = PyList_Size(list);
@@ -352,7 +352,7 @@
 static PyObject *
 dictbytype(PyObject *src, int scope_type, int flag, int offset)
 {
-	int pos = 0, i = offset, scope;
+	Py_ssize_t pos = 0, i = offset, scope;
 	PyObject *k, *v, *dest = PyDict_New();
 
         assert(offset >= 0);
@@ -407,7 +407,7 @@
 tuple_of_constants(unsigned char *codestr, int n, PyObject *consts)
 {
 	PyObject *newconst, *constant;
-	int i, arg, len_consts;
+	Py_ssize_t i, arg, len_consts;
 
 	/* Pre-conditions */
 	assert(PyList_CheckExact(consts));
@@ -458,7 +458,8 @@
 fold_binops_on_constants(unsigned char *codestr, PyObject *consts)
 {
 	PyObject *newconst, *v, *w;
-	int len_consts, opcode, size;
+	Py_ssize_t len_consts, size;
+	int opcode;
 
 	/* Pre-conditions */
 	assert(PyList_CheckExact(consts));
@@ -551,7 +552,8 @@
 fold_unaryops_on_constants(unsigned char *codestr, PyObject *consts)
 {
 	PyObject *newconst=NULL, *v;
-	int len_consts, opcode;
+	Py_ssize_t len_consts;
+	int opcode;
 
 	/* Pre-conditions */
 	assert(PyList_CheckExact(consts));
@@ -653,7 +655,8 @@
 static PyObject *
 optimize_code(PyObject *code, PyObject* consts, PyObject *names, PyObject *lineno_obj)
 {
-	int i, j, codelen, nops, h, adj;
+	Py_ssize_t i, j, codelen;
+	int nops, h, adj;
 	int tgt, tgttgt, opcode;
 	unsigned char *codestr = NULL;
 	unsigned char *lineno;
@@ -989,7 +992,8 @@
 compiler_display_symbols(PyObject *name, PyObject *symbols)
 {
 	PyObject *key, *value;
-	int flags, pos = 0;
+	int flags;
+	Py_ssize_t pos = 0;
 
 	fprintf(stderr, "block %s\n", PyString_AS_STRING(name));
 	while (PyDict_Next(symbols, &pos, &key, &value)) {
@@ -1498,7 +1502,7 @@
 compiler_add_o(struct compiler *c, PyObject *dict, PyObject *o)
 {
 	PyObject *t, *v;
-	int arg;
+	Py_ssize_t arg;
 
         /* necessary to make sure types aren't coerced (e.g., int and long) */
         t = PyTuple_Pack(2, o, o->ob_type);
@@ -4032,7 +4036,7 @@
 dict_keys_inorder(PyObject *dict, int offset)
 {
 	PyObject *tuple, *k, *v;
-	int i, pos = 0, size = PyDict_Size(dict);
+	Py_ssize_t i, pos = 0, size = PyDict_Size(dict);
 
 	tuple = PyTuple_New(size);
 	if (tuple == NULL)
diff --git a/Python/exceptions.c b/Python/exceptions.c
index 2e7c820..58e7c94 100644
--- a/Python/exceptions.c
+++ b/Python/exceptions.c
@@ -910,27 +910,34 @@
 
 #ifdef Py_USING_UNICODE
 static
-int get_int(PyObject *exc, const char *name, int *value)
+int get_int(PyObject *exc, const char *name, Py_ssize_t *value)
 {
     PyObject *attr = PyObject_GetAttrString(exc, (char *)name);
 
     if (!attr)
 	return -1;
-    if (!PyInt_Check(attr)) {
+    if (PyInt_Check(attr)) {
+        *value = PyInt_AS_LONG(attr);
+    } else if (PyLong_Check(attr)) {
+	*value = (size_t)PyLong_AsLongLong(attr);
+	if (*value == -1) {
+		Py_DECREF(attr);
+		return -1;
+	}
+    } else {
 	PyErr_Format(PyExc_TypeError, "%.200s attribute must be int", name);
 	Py_DECREF(attr);
 	return -1;
     }
-    *value = PyInt_AS_LONG(attr);
     Py_DECREF(attr);
     return 0;
 }
 
 
 static
-int set_int(PyObject *exc, const char *name, int value)
+int set_ssize_t(PyObject *exc, const char *name, Py_ssize_t value)
 {
-    PyObject *obj = PyInt_FromLong(value);
+    PyObject *obj = PyInt_FromSsize_t(value);
     int result;
 
     if (!obj)
@@ -940,7 +947,6 @@
     return result;
 }
 
-
 static
 PyObject *get_string(PyObject *exc, const char *name)
 {
@@ -1011,16 +1017,16 @@
     return get_unicode(exc, "object");
 }
 
-int PyUnicodeEncodeError_GetStart(PyObject *exc, int *start)
+int PyUnicodeEncodeError_GetStart(PyObject *exc, Py_ssize_t *start)
 {
     if (!get_int(exc, "start", start)) {
 	PyObject *object = PyUnicodeEncodeError_GetObject(exc);
-	int size;
+	Py_ssize_t size;
 	if (!object)
 	    return -1;
 	size = PyUnicode_GET_SIZE(object);
 	if (*start<0)
-	    *start = 0;
+	    *start = 0; /*XXX check for values <0*/
 	if (*start>=size)
 	    *start = size-1;
 	Py_DECREF(object);
@@ -1030,11 +1036,11 @@
 }
 
 
-int PyUnicodeDecodeError_GetStart(PyObject *exc, int *start)
+int PyUnicodeDecodeError_GetStart(PyObject *exc, Py_ssize_t *start)
 {
     if (!get_int(exc, "start", start)) {
 	PyObject *object = PyUnicodeDecodeError_GetObject(exc);
-	int size;
+	Py_ssize_t size;
 	if (!object)
 	    return -1;
 	size = PyString_GET_SIZE(object);
@@ -1049,35 +1055,35 @@
 }
 
 
-int PyUnicodeTranslateError_GetStart(PyObject *exc, int *start)
+int PyUnicodeTranslateError_GetStart(PyObject *exc, Py_ssize_t *start)
 {
     return PyUnicodeEncodeError_GetStart(exc, start);
 }
 
 
-int PyUnicodeEncodeError_SetStart(PyObject *exc, int start)
+int PyUnicodeEncodeError_SetStart(PyObject *exc, Py_ssize_t start)
 {
-    return set_int(exc, "start", start);
+    return set_ssize_t(exc, "start", start);
 }
 
 
-int PyUnicodeDecodeError_SetStart(PyObject *exc, int start)
+int PyUnicodeDecodeError_SetStart(PyObject *exc, Py_ssize_t start)
 {
-    return set_int(exc, "start", start);
+    return set_ssize_t(exc, "start", start);
 }
 
 
-int PyUnicodeTranslateError_SetStart(PyObject *exc, int start)
+int PyUnicodeTranslateError_SetStart(PyObject *exc, Py_ssize_t start)
 {
-    return set_int(exc, "start", start);
+    return set_ssize_t(exc, "start", start);
 }
 
 
-int PyUnicodeEncodeError_GetEnd(PyObject *exc, int *end)
+int PyUnicodeEncodeError_GetEnd(PyObject *exc, Py_ssize_t *end)
 {
     if (!get_int(exc, "end", end)) {
 	PyObject *object = PyUnicodeEncodeError_GetObject(exc);
-	int size;
+	Py_ssize_t size;
 	if (!object)
 	    return -1;
 	size = PyUnicode_GET_SIZE(object);
@@ -1092,11 +1098,11 @@
 }
 
 
-int PyUnicodeDecodeError_GetEnd(PyObject *exc, int *end)
+int PyUnicodeDecodeError_GetEnd(PyObject *exc, Py_ssize_t *end)
 {
     if (!get_int(exc, "end", end)) {
 	PyObject *object = PyUnicodeDecodeError_GetObject(exc);
-	int size;
+	Py_ssize_t size;
 	if (!object)
 	    return -1;
 	size = PyString_GET_SIZE(object);
@@ -1111,27 +1117,27 @@
 }
 
 
-int PyUnicodeTranslateError_GetEnd(PyObject *exc, int *start)
+int PyUnicodeTranslateError_GetEnd(PyObject *exc, Py_ssize_t *start)
 {
     return PyUnicodeEncodeError_GetEnd(exc, start);
 }
 
 
-int PyUnicodeEncodeError_SetEnd(PyObject *exc, int end)
+int PyUnicodeEncodeError_SetEnd(PyObject *exc, Py_ssize_t end)
 {
-    return set_int(exc, "end", end);
+    return set_ssize_t(exc, "end", end);
 }
 
 
-int PyUnicodeDecodeError_SetEnd(PyObject *exc, int end)
+int PyUnicodeDecodeError_SetEnd(PyObject *exc, Py_ssize_t end)
 {
-    return set_int(exc, "end", end);
+    return set_ssize_t(exc, "end", end);
 }
 
 
-int PyUnicodeTranslateError_SetEnd(PyObject *exc, int end)
+int PyUnicodeTranslateError_SetEnd(PyObject *exc, Py_ssize_t end)
 {
-    return set_int(exc, "end", end);
+    return set_ssize_t(exc, "end", end);
 }
 
 
@@ -1229,8 +1235,8 @@
 {
     PyObject *encodingObj = NULL;
     PyObject *objectObj = NULL;
-    int start;
-    int end;
+    Py_ssize_t start;
+    Py_ssize_t end;
     PyObject *reasonObj = NULL;
     char buffer[1000];
     PyObject *result = NULL;
@@ -1270,11 +1276,12 @@
 	);
     }
     else {
+	/* XXX %zd? */
 	PyOS_snprintf(buffer, sizeof(buffer),
 	    "'%.400s' codec can't encode characters in position %d-%d: %.400s",
 	    PyString_AS_STRING(encodingObj),
-	    start,
-	    end-1,
+	    (int)start,
+	    (int)(end-1),
 	    PyString_AS_STRING(reasonObj)
 	);
     }
@@ -1295,10 +1302,10 @@
 
 
 PyObject * PyUnicodeEncodeError_Create(
-	const char *encoding, const Py_UNICODE *object, int length,
-	int start, int end, const char *reason)
+	const char *encoding, const Py_UNICODE *object, Py_ssize_t length,
+	Py_ssize_t start, Py_ssize_t end, const char *reason)
 {
-    return PyObject_CallFunction(PyExc_UnicodeEncodeError, "su#iis",
+    return PyObject_CallFunction(PyExc_UnicodeEncodeError, "su#nns",
 	encoding, object, length, start, end, reason);
 }
 
@@ -1314,8 +1321,8 @@
 {
     PyObject *encodingObj = NULL;
     PyObject *objectObj = NULL;
-    int start;
-    int end;
+    Py_ssize_t start;
+    Py_ssize_t end;
     PyObject *reasonObj = NULL;
     char buffer[1000];
     PyObject *result = NULL;
@@ -1338,20 +1345,22 @@
 	goto error;
 
     if (end==start+1) {
+	/* XXX %zd? */
 	PyOS_snprintf(buffer, sizeof(buffer),
 	    "'%.400s' codec can't decode byte 0x%02x in position %d: %.400s",
 	    PyString_AS_STRING(encodingObj),
 	    ((int)PyString_AS_STRING(objectObj)[start])&0xff,
-	    start,
+	    (int)start,
 	    PyString_AS_STRING(reasonObj)
 	);
     }
     else {
+	/* XXX %zd? */
 	PyOS_snprintf(buffer, sizeof(buffer),
 	    "'%.400s' codec can't decode bytes in position %d-%d: %.400s",
 	    PyString_AS_STRING(encodingObj),
-	    start,
-	    end-1,
+	    (int)start,
+	    (int)(end-1),
 	    PyString_AS_STRING(reasonObj)
 	);
     }
@@ -1372,11 +1381,14 @@
 
 
 PyObject * PyUnicodeDecodeError_Create(
-	const char *encoding, const char *object, int length,
-	int start, int end, const char *reason)
+	const char *encoding, const char *object, Py_ssize_t length,
+	Py_ssize_t start, Py_ssize_t end, const char *reason)
 {
+	assert(length < INT_MAX);
+	assert(start < INT_MAX);
+	assert(end < INT_MAX);
     return PyObject_CallFunction(PyExc_UnicodeDecodeError, "ss#iis",
-	encoding, object, length, start, end, reason);
+	encoding, object, (int)length, (int)start, (int)end, reason);
 }
 
 
@@ -1427,8 +1439,8 @@
 UnicodeTranslateError__str__(PyObject *self, PyObject *arg)
 {
     PyObject *objectObj = NULL;
-    int start;
-    int end;
+    Py_ssize_t start;
+    Py_ssize_t end;
     PyObject *reasonObj = NULL;
     char buffer[1000];
     PyObject *result = NULL;
@@ -1450,6 +1462,7 @@
     if (end==start+1) {
 	int badchar = (int)PyUnicode_AS_UNICODE(objectObj)[start];
 	char *format;
+	/* XXX %zd? */
 	if (badchar <= 0xff)
 	   format = "can't translate character u'\\x%02x' in position %d: %.400s";
 	else if (badchar <= 0xffff)
@@ -1459,15 +1472,16 @@
 	PyOS_snprintf(buffer, sizeof(buffer),
 	    format,
 	    badchar,
-	    start,
+	    (int)start,
 	    PyString_AS_STRING(reasonObj)
 	);
     }
     else {
+	/* XXX %zd? */
 	PyOS_snprintf(buffer, sizeof(buffer),
 	    "can't translate characters in position %d-%d: %.400s",
-	    start,
-	    end-1,
+	    (int)start,
+	    (int)(end-1),
 	    PyString_AS_STRING(reasonObj)
 	);
     }
@@ -1487,8 +1501,8 @@
 
 
 PyObject * PyUnicodeTranslateError_Create(
-	const Py_UNICODE *object, int length,
-	int start, int end, const char *reason)
+	const Py_UNICODE *object, Py_ssize_t length,
+	Py_ssize_t start, Py_ssize_t end, const char *reason)
 {
     return PyObject_CallFunction(PyExc_UnicodeTranslateError, "u#iis",
 	object, length, start, end, reason);
@@ -1749,7 +1763,7 @@
 _PyExc_Init(void)
 {
     char *modulename = "exceptions";
-    int modnamesz = strlen(modulename);
+    Py_ssize_t modnamesz = strlen(modulename);
     int i;
     PyObject *me, *mydict, *bltinmod, *bdict, *doc, *args;
 
diff --git a/Python/getargs.c b/Python/getargs.c
index 9bcf9bc..0615577 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -15,21 +15,24 @@
 int PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *,
 				const char *, const char **, va_list);
 
+#define FLAG_COMPAT 1
+#define FLAG_SIZE_T 2
+
 
 /* Forward */
 static int vgetargs1(PyObject *, const char *, va_list *, int);
 static void seterror(int, const char *, int *, const char *, const char *);
-static char *convertitem(PyObject *, const char **, va_list *, int *, char *, 
-			 size_t, PyObject **);
-static char *converttuple(PyObject *, const char **, va_list *,
+static char *convertitem(PyObject *, const char **, va_list *, int, int *, 
+                         char *, size_t, PyObject **);
+static char *converttuple(PyObject *, const char **, va_list *, int,
 			  int *, char *, size_t, int, PyObject **);
-static char *convertsimple(PyObject *, const char **, va_list *, char *,
+static char *convertsimple(PyObject *, const char **, va_list *, int, char *,
 			   size_t, PyObject **);
-static int convertbuffer(PyObject *, void **p, char **);
+static Py_ssize_t convertbuffer(PyObject *, void **p, char **);
 
 static int vgetargskeywords(PyObject *, PyObject *,
-			    const char *, const char **, va_list *);
-static char *skipitem(const char **, va_list *);
+			    const char *, const char **, va_list *, int);
+static char *skipitem(const char **, va_list *, int);
 
 int
 PyArg_Parse(PyObject *args, const char *format, ...)
@@ -38,7 +41,19 @@
 	va_list va;
 	
 	va_start(va, format);
-	retval = vgetargs1(args, format, &va, 1);
+	retval = vgetargs1(args, format, &va, FLAG_COMPAT);
+	va_end(va);
+	return retval;
+}
+
+int
+_PyArg_Parse_SizeT(PyObject *args, char *format, ...)
+{
+	int retval;
+	va_list va;
+	
+	va_start(va, format);
+	retval = vgetargs1(args, format, &va, FLAG_COMPAT|FLAG_SIZE_T);
 	va_end(va);
 	return retval;
 }
@@ -56,6 +71,18 @@
 	return retval;
 }
 
+int
+_PyArg_ParseTuple_SizeT(PyObject *args, char *format, ...)
+{
+	int retval;
+	va_list va;
+	
+	va_start(va, format);
+	retval = vgetargs1(args, format, &va, FLAG_SIZE_T);
+	va_end(va);
+	return retval;
+}
+
 
 int
 PyArg_VaParse(PyObject *args, const char *format, va_list va)
@@ -75,6 +102,24 @@
 	return vgetargs1(args, format, &lva, 0);
 }
 
+int
+_PyArg_VaParse_SizeT(PyObject *args, char *format, va_list va)
+{
+	va_list lva;
+
+#ifdef VA_LIST_IS_ARRAY
+	memcpy(lva, va, sizeof(va_list));
+#else
+#ifdef __va_copy
+	__va_copy(lva, va);
+#else
+	lva = va;
+#endif
+#endif
+
+	return vgetargs1(args, format, &lva, FLAG_SIZE_T);
+}
+
 
 /* Handle cleanup of allocated memory in case of exception */
 
@@ -120,7 +165,7 @@
 
 
 static int
-vgetargs1(PyObject *args, const char *format, va_list *p_va, int compat)
+vgetargs1(PyObject *args, const char *format, va_list *p_va, int flags)
 {
 	char msgbuf[256];
 	int levels[32];
@@ -134,8 +179,10 @@
 	int i, len;
 	char *msg;
 	PyObject *freelist = NULL;
-	
+	int compat = flags & FLAG_COMPAT;
+
 	assert(compat || (args != (PyObject*)NULL));
+	flags = flags & ~FLAG_COMPAT;
 
 	while (endfmt == 0) {
 		int c = *format++;
@@ -204,8 +251,8 @@
 				PyErr_SetString(PyExc_TypeError, msgbuf);
 				return 0;
 			}
-			msg = convertitem(args, &format, p_va, levels, msgbuf,
-					  sizeof(msgbuf), &freelist);
+			msg = convertitem(args, &format, p_va, flags, levels, 
+					  msgbuf, sizeof(msgbuf), &freelist);
 			if (msg == NULL)
 				return cleanreturn(1, freelist);
 			seterror(levels[0], msg, levels+1, fname, message);
@@ -248,7 +295,8 @@
 		if (*format == '|')
 			format++;
 		msg = convertitem(PyTuple_GET_ITEM(args, i), &format, p_va,
-				  levels, msgbuf, sizeof(msgbuf), &freelist);
+				  flags, levels, msgbuf, 
+				  sizeof(msgbuf), &freelist);
 		if (msg) {
 			seterror(i+1, msg, levels, fname, message);
 			return cleanreturn(0, freelist);
@@ -325,8 +373,9 @@
 */
 
 static char *
-converttuple(PyObject *arg, const char **p_format, va_list *p_va, int *levels,
-	     char *msgbuf, size_t bufsize, int toplevel, PyObject **freelist)
+converttuple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
+             int *levels, char *msgbuf, size_t bufsize, int toplevel, 
+             PyObject **freelist)
 {
 	int level = 0;
 	int n = 0;
@@ -375,8 +424,8 @@
 		char *msg;
 		PyObject *item;
 		item = PySequence_GetItem(arg, i);
-		msg = convertitem(item, &format, p_va, levels+1, msgbuf,
-				  bufsize, freelist);
+		msg = convertitem(item, &format, p_va, flags, levels+1, 
+				  msgbuf, bufsize, freelist);
 		/* PySequence_GetItem calls tp->sq_item, which INCREFs */
 		Py_XDECREF(item);
 		if (msg != NULL) {
@@ -393,22 +442,22 @@
 /* Convert a single item. */
 
 static char *
-convertitem(PyObject *arg, const char **p_format, va_list *p_va, int *levels,
-	    char *msgbuf, size_t bufsize, PyObject **freelist)
+convertitem(PyObject *arg, const char **p_format, va_list *p_va, int flags,
+            int *levels, char *msgbuf, size_t bufsize, PyObject **freelist)
 {
 	char *msg;
 	const char *format = *p_format;
 	
 	if (*format == '(' /* ')' */) {
 		format++;
-		msg = converttuple(arg, &format, p_va, levels, msgbuf, 
+		msg = converttuple(arg, &format, p_va, flags, levels, msgbuf, 
 				   bufsize, 0, freelist);
 		if (msg == NULL)
 			format++;
 	}
 	else {
-		msg = convertsimple(arg, &format, p_va, msgbuf, bufsize,
-				    freelist);
+		msg = convertsimple(arg, &format, p_va, flags, 
+				    msgbuf, bufsize, freelist);
 		if (msg != NULL)
 			levels[0] = 0;
 	}
@@ -460,9 +509,16 @@
 */
 
 static char *
-convertsimple(PyObject *arg, const char **p_format, va_list *p_va,
+convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
               char *msgbuf, size_t bufsize, PyObject **freelist)
 {
+	/* For # codes */
+#define FETCH_SIZE	int *q=NULL;Py_ssize_t *q2=NULL;\
+	if (flags & FLAG_SIZE_T) q2=va_arg(*p_va, Py_ssize_t*); \
+	else q=va_arg(*p_va, int*);
+#define STORE_SIZE(s)   if (flags & FLAG_SIZE_T) *q2=s; else *q=s;
+#define BUFFER_LEN      ((flags & FLAG_SIZE_T) ? *q2:*q)
+
 	const char *format = *p_format;
 	char c = *format++;
 #ifdef Py_USING_UNICODE
@@ -544,7 +600,7 @@
 			*p = (unsigned short) ival;
 		break;
 	}
-	
+
 	case 'i': {/* signed int */
 		int *p = va_arg(*p_va, int *);
 		long ival;
@@ -582,6 +638,21 @@
 		break;
 	}
 	
+	case 'n': /* Py_ssize_t */
+#if SIZEOF_SIZE_T != SIZEOF_LONG
+	{
+		Py_ssize_t *p = va_arg(*p_va, Py_ssize_t *);
+		Py_ssize_t ival;
+		if (float_argument_error(arg))
+			return converterr("integer<i>", arg, msgbuf, bufsize);
+		ival = PyInt_AsSsize_t(arg);
+		if (ival == -1 && PyErr_Occurred())
+			return converterr("integer<i>", arg, msgbuf, bufsize);
+		*p = ival;
+		break;
+	}
+#endif
+	/* Fall through from 'n' to 'l' if Py_ssize_t is int */
 	case 'l': {/* long int */
 		long *p = va_arg(*p_va, long *);
 		long ival;
@@ -679,11 +750,11 @@
 	case 's': {/* string */
 		if (*format == '#') {
 			void **p = (void **)va_arg(*p_va, char **);
-			int *q = va_arg(*p_va, int *);
+			FETCH_SIZE;
 			
 			if (PyString_Check(arg)) {
 				*p = PyString_AS_STRING(arg);
-				*q = PyString_GET_SIZE(arg);
+				STORE_SIZE(PyString_GET_SIZE(arg));
 			}
 #ifdef Py_USING_UNICODE
 			else if (PyUnicode_Check(arg)) {
@@ -692,15 +763,15 @@
 					return converterr(CONV_UNICODE,
 							  arg, msgbuf, bufsize);
 				*p = PyString_AS_STRING(uarg);
-				*q = PyString_GET_SIZE(uarg);
+				STORE_SIZE(PyString_GET_SIZE(uarg));
 			}
 #endif
 			else { /* any buffer-like object */
 				char *buf;
-				int count = convertbuffer(arg, p, &buf);
+				Py_ssize_t count = convertbuffer(arg, p, &buf);
 				if (count < 0)
 					return converterr(buf, arg, msgbuf, bufsize);
-				*q = count;
+				STORE_SIZE(count);
 			}
 			format++;
 		} else {
@@ -729,15 +800,15 @@
 	case 'z': {/* string, may be NULL (None) */
 		if (*format == '#') { /* any buffer-like object */
 			void **p = (void **)va_arg(*p_va, char **);
-			int *q = va_arg(*p_va, int *);
+			FETCH_SIZE;
 			
 			if (arg == Py_None) {
 				*p = 0;
-				*q = 0;
+				STORE_SIZE(0);
 			}
 			else if (PyString_Check(arg)) {
 				*p = PyString_AS_STRING(arg);
-				*q = PyString_GET_SIZE(arg);
+				STORE_SIZE(PyString_GET_SIZE(arg));
 			}
 #ifdef Py_USING_UNICODE
 			else if (PyUnicode_Check(arg)) {
@@ -746,15 +817,15 @@
 					return converterr(CONV_UNICODE,
 							  arg, msgbuf, bufsize);
 				*p = PyString_AS_STRING(uarg);
-				*q = PyString_GET_SIZE(uarg);
+				STORE_SIZE(PyString_GET_SIZE(uarg));
 			}
 #endif
 			else { /* any buffer-like object */
 				char *buf;
-				int count = convertbuffer(arg, p, &buf);
+				Py_ssize_t count = convertbuffer(arg, p, &buf);
 				if (count < 0)
 					return converterr(buf, arg, msgbuf, bufsize);
-				*q = count;
+				STORE_SIZE(count);
 			}
 			format++;
 		} else {
@@ -777,7 +848,8 @@
 				return converterr("string or None", 
 						  arg, msgbuf, bufsize);
 			if (*format == '#') {
-				int *q = va_arg(*p_va, int *);
+				FETCH_SIZE;
+				assert(0); // redundant with if-case
 				if (arg == Py_None)
 					*q = 0;
 				else
@@ -883,10 +955,10 @@
 			   trailing 0-byte 
 			   
 			*/
-			int *buffer_len = va_arg(*p_va, int *);
+			FETCH_SIZE;
 
 			format++;
-			if (buffer_len == NULL) {
+			if (q == NULL && q2 == NULL) {
 				Py_DECREF(s);
 				return converterr(
 					"(buffer_len is NULL)",
@@ -907,7 +979,7 @@
 						arg, msgbuf, bufsize);
 				}
 			} else {
-				if (size + 1 > *buffer_len) {
+				if (size + 1 > BUFFER_LEN) {
 					Py_DECREF(s);
 					return converterr(
 						"(buffer overflow)", 
@@ -917,7 +989,7 @@
 			memcpy(*buffer,
 			       PyString_AS_STRING(s),
 			       size + 1);
-			*buffer_len = size;
+			STORE_SIZE(size);
 		} else {
 			/* Using a 0-terminated buffer:
 				   
@@ -961,17 +1033,17 @@
 	case 'u': {/* raw unicode buffer (Py_UNICODE *) */
 		if (*format == '#') { /* any buffer-like object */
 			void **p = (void **)va_arg(*p_va, char **);
-			int *q = va_arg(*p_va, int *);
+			FETCH_SIZE;
 			if (PyUnicode_Check(arg)) {
 			    	*p = PyUnicode_AS_UNICODE(arg);
-				*q = PyUnicode_GET_SIZE(arg);
+				STORE_SIZE(PyUnicode_GET_SIZE(arg));
 			}
 			else {
 			char *buf;
-			int count = convertbuffer(arg, p, &buf);
+			Py_ssize_t count = convertbuffer(arg, p, &buf);
 			if (count < 0)
 				return converterr(buf, arg, msgbuf, bufsize);
-			*q = count/(sizeof(Py_UNICODE)); 
+			STORE_SIZE(count/(sizeof(Py_UNICODE))); 
 			}
 			format++;
 		} else {
@@ -1061,9 +1133,8 @@
 		if ((count = pb->bf_getwritebuffer(arg, 0, p)) < 0)
 			return converterr("(unspecified)", arg, msgbuf, bufsize);
 		if (*format == '#') {
-			int *q = va_arg(*p_va, int *);
-			
-			*q = count;
+			FETCH_SIZE;
+			STORE_SIZE(count);
 			format++;
 		}
 		break;
@@ -1094,7 +1165,10 @@
 		count = pb->bf_getcharbuffer(arg, 0, p);
 		if (count < 0)
 			return converterr("(unspecified)", arg, msgbuf, bufsize);
-		*va_arg(*p_va, int *) = count;
+		{
+			FETCH_SIZE;
+			STORE_SIZE(count);
+		}
 		break;
 	}
 
@@ -1107,11 +1181,11 @@
 	return NULL;
 }
 
-static int
+static Py_ssize_t
 convertbuffer(PyObject *arg, void **p, char **errmsg)
 {
 	PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
-	int count;
+	Py_ssize_t count;
 	if (pb == NULL ||
 	    pb->bf_getreadbuffer == NULL ||
 	    pb->bf_getsegcount == NULL) {
@@ -1151,7 +1225,32 @@
 	}
 
 	va_start(va, kwlist);
-	retval = vgetargskeywords(args, keywords, format, kwlist, &va);	
+	retval = vgetargskeywords(args, keywords, format, kwlist, &va, 0);	
+	va_end(va);
+	return retval;
+}
+
+int
+_PyArg_ParseTupleAndKeywords_SizeT(PyObject *args,
+				  PyObject *keywords,
+				  const char *format, 
+				  const char **kwlist, ...)
+{
+	int retval;
+	va_list va;
+
+	if ((args == NULL || !PyTuple_Check(args)) ||
+	    (keywords != NULL && !PyDict_Check(keywords)) ||
+	    format == NULL ||
+	    kwlist == NULL)
+	{
+		PyErr_BadInternalCall();
+		return 0;
+	}
+
+	va_start(va, kwlist);
+	retval = vgetargskeywords(args, keywords, format, 
+				  kwlist, &va, FLAG_SIZE_T);
 	va_end(va);
 	return retval;
 }
@@ -1185,14 +1284,47 @@
 #endif
 #endif
 
-	retval = vgetargskeywords(args, keywords, format, kwlist, &lva);	
+	retval = vgetargskeywords(args, keywords, format, kwlist, &lva, 0);	
+	return retval;
+}
+
+int
+_PyArg_VaParseTupleAndKeywords_SizeT(PyObject *args,
+				    PyObject *keywords,
+				    const char *format, 
+				    const char **kwlist, va_list va)
+{
+	int retval;
+	va_list lva;
+
+	if ((args == NULL || !PyTuple_Check(args)) ||
+	    (keywords != NULL && !PyDict_Check(keywords)) ||
+	    format == NULL ||
+	    kwlist == NULL)
+	{
+		PyErr_BadInternalCall();
+		return 0;
+	}
+
+#ifdef VA_LIST_IS_ARRAY
+	memcpy(lva, va, sizeof(va_list));
+#else
+#ifdef __va_copy
+	__va_copy(lva, va);
+#else
+	lva = va;
+#endif
+#endif
+
+	retval = vgetargskeywords(args, keywords, format, 
+				  kwlist, &lva, FLAG_SIZE_T);
 	return retval;
 }
 
 
 static int
 vgetargskeywords(PyObject *args, PyObject *keywords, const char *format,
-	         const char **kwlist, va_list *p_va)
+	         const char **kwlist, va_list *p_va, int flags)
 {
 	char msgbuf[512];
 	int levels[32];
@@ -1327,7 +1459,8 @@
 		if (*format == '|')
 			format++;
 		msg = convertitem(PyTuple_GET_ITEM(args, i), &format, p_va,
-				  levels, msgbuf, sizeof(msgbuf), &freelist);
+				  flags, levels, msgbuf, sizeof(msgbuf), 
+				  &freelist);
 		if (msg) {
 			seterror(i+1, msg, levels, fname, message);
 			return cleanreturn(0, freelist);
@@ -1347,8 +1480,8 @@
 		item = PyDict_GetItemString(keywords, kwlist[i]);
 		if (item != NULL) {
 			Py_INCREF(item);
-			msg = convertitem(item, &format, p_va, levels, msgbuf,
-					  sizeof(msgbuf), &freelist);
+			msg = convertitem(item, &format, p_va, flags, levels, 
+					  msgbuf, sizeof(msgbuf), &freelist);
 			Py_DECREF(item);
 			if (msg) {
 				seterror(i+1, msg, levels, fname, message);
@@ -1361,7 +1494,7 @@
 		else if (PyErr_Occurred())
 			return cleanreturn(0, freelist);
 		else {
-			msg = skipitem(&format, p_va);
+			msg = skipitem(&format, p_va, flags);
 			if (msg) {
 				seterror(i+1, msg, levels, fname, message);
 				return cleanreturn(0, freelist);
@@ -1372,7 +1505,7 @@
 	/* make sure there are no extraneous keyword arguments */
 	if (nkeywords > 0) {
 		PyObject *key, *value;
-		int pos = 0;
+		Py_ssize_t pos = 0;
 		while (PyDict_Next(keywords, &pos, &key, &value)) {
 			int match = 0;
 			char *ks;
@@ -1403,7 +1536,7 @@
 
 
 static char *
-skipitem(const char **p_format, va_list *p_va)
+skipitem(const char **p_format, va_list *p_va, int flags)
 {
         const char *format = *p_format;
 	char c = *format++;
@@ -1435,6 +1568,12 @@
 			(void) va_arg(*p_va, void *);
 			break;
 		}
+
+	case 'n': /* Py_ssize_t */
+		{
+			(void) va_arg(*p_va, Py_ssize_t *);
+			break;
+		}
 	
 	/* string codes */
 		
@@ -1458,7 +1597,10 @@
 		{
 			(void) va_arg(*p_va, char **);
 			if (*format == '#') {
-				(void) va_arg(*p_va, int *);
+				if (flags & FLAG_SIZE_T)
+					(void) va_arg(*p_va, Py_ssize_t *);
+				else
+					(void) va_arg(*p_va, int *);
 				format++;
 			}
 			break;
diff --git a/Python/import.c b/Python/import.c
index 8bd25f7..e019a17 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -351,7 +351,7 @@
 void
 PyImport_Cleanup(void)
 {
-	int pos, ndone;
+	Py_ssize_t pos, ndone;
 	char *name;
 	PyObject *key, *value, *dict;
 	PyInterpreterState *interp = PyThreadState_GET()->interp;
@@ -689,7 +689,7 @@
    Doesn't set an exception. */
 
 static FILE *
-check_compiled_module(char *pathname, long mtime, char *cpathname)
+check_compiled_module(char *pathname, time_t mtime, char *cpathname)
 {
 	FILE *fp;
 	long magic;
@@ -805,10 +805,11 @@
 				|O_BINARY   /* necessary for Windows */
 #endif
 #ifdef __VMS
-                        , 0666, "ctxt=bin", "shr=nil");
+                        , 0666, "ctxt=bin", "shr=nil"
 #else
-                        , 0666);
+                        , 0666
 #endif
+		  );
 	if (fd < 0)
 		return NULL;
 	return fdopen(fd, "wb");
@@ -825,7 +826,7 @@
    remove the file. */
 
 static void
-write_compiled_module(PyCodeObject *co, char *cpathname, long mtime)
+write_compiled_module(PyCodeObject *co, char *cpathname, time_t mtime)
 {
 	FILE *fp;
 
@@ -850,6 +851,7 @@
 	}
 	/* Now write the true mtime */
 	fseek(fp, 4L, 0);
+	assert(mtime < LONG_MAX);
 	PyMarshal_WriteLongToFile(mtime, fp, Py_MARSHAL_VERSION);
 	fflush(fp);
 	fclose(fp);
@@ -1061,10 +1063,10 @@
 
 #ifdef MS_COREDLL
 extern FILE *PyWin_FindRegisteredModule(const char *, struct filedescr **,
-					char *, int);
+					char *, Py_ssize_t);
 #endif
 
-static int case_ok(char *, int, int, char *);
+static int case_ok(char *, Py_ssize_t, Py_ssize_t, char *);
 static int find_init_module(char *); /* Forward */
 static struct filedescr importhookdescr = {"", "", IMP_HOOK};
 
@@ -1372,7 +1374,7 @@
 	return fd->type == PY_SOURCE || fd->type == PY_COMPILED;
 }
 
-/* case_ok(char* buf, int len, int namelen, char* name)
+/* case_ok(char* buf, Py_ssize_t len, Py_ssize_t namelen, char* name)
  * The arguments here are tricky, best shown by example:
  *    /a/b/c/d/e/f/g/h/i/j/k/some_long_module_name.py\0
  *    ^                      ^                   ^    ^
@@ -1420,7 +1422,7 @@
 #endif
 
 static int
-case_ok(char *buf, int len, int namelen, char *name)
+case_ok(char *buf, Py_ssize_t len, Py_ssize_t namelen, char *name)
 {
 /* Pick a platform-specific implementation; the sequence of #if's here should
  * match the sequence just above.
@@ -1891,12 +1893,12 @@
 }
 
 /* Forward declarations for helper routines */
-static PyObject *get_parent(PyObject *globals, char *buf, int *p_buflen);
+static PyObject *get_parent(PyObject *globals, char *buf, Py_ssize_t *p_buflen);
 static PyObject *load_next(PyObject *mod, PyObject *altmod,
-			   char **p_name, char *buf, int *p_buflen);
+			   char **p_name, char *buf, Py_ssize_t *p_buflen);
 static int mark_miss(char *name);
 static int ensure_fromlist(PyObject *mod, PyObject *fromlist,
-			   char *buf, int buflen, int recursive);
+			   char *buf, Py_ssize_t buflen, int recursive);
 static PyObject * import_submodule(PyObject *mod, char *name, char *fullname);
 
 /* The Magnum Opus of dotted-name import :-) */
@@ -1906,7 +1908,7 @@
 		 PyObject *fromlist)
 {
 	char buf[MAXPATHLEN+1];
-	int buflen = 0;
+	Py_ssize_t buflen = 0;
 	PyObject *parent, *head, *next, *tail;
 
 	parent = get_parent(globals, buf, &buflen);
@@ -1976,7 +1978,7 @@
    corresponding entry is not found in sys.modules, Py_None is returned.
 */
 static PyObject *
-get_parent(PyObject *globals, char *buf, int *p_buflen)
+get_parent(PyObject *globals, char *buf, Py_ssize_t *p_buflen)
 {
 	static PyObject *namestr = NULL;
 	static PyObject *pathstr = NULL;
@@ -2044,7 +2046,7 @@
 /* altmod is either None or same as mod */
 static PyObject *
 load_next(PyObject *mod, PyObject *altmod, char **p_name, char *buf,
-	  int *p_buflen)
+	  Py_ssize_t *p_buflen)
 {
 	char *name = *p_name;
 	char *dot = strchr(name, '.');
@@ -2114,7 +2116,7 @@
 }
 
 static int
-ensure_fromlist(PyObject *mod, PyObject *fromlist, char *buf, int buflen,
+ensure_fromlist(PyObject *mod, PyObject *fromlist, char *buf, Py_ssize_t buflen,
 		int recursive)
 {
 	int i;
diff --git a/Python/mactoolboxglue.c b/Python/mactoolboxglue.c
index 406b002..7f0627e 100644
--- a/Python/mactoolboxglue.c
+++ b/Python/mactoolboxglue.c
@@ -363,10 +363,10 @@
 \
 int routinename(PyObject *pyobj, object *cobj) { \
     if (!PyMacGluePtr_##routinename) { \
-       if (!PyImport_ImportModule(module)) return NULL; \
+       if (!PyImport_ImportModule(module)) return 0; \
        if (!PyMacGluePtr_##routinename) { \
            PyErr_SetString(PyExc_ImportError, "Module did not provide routine: " module ": " #routinename); \
-           return NULL; \
+           return 0; \
        } \
     } \
     return (*PyMacGluePtr_##routinename)(pyobj, cobj); \
diff --git a/Python/marshal.c b/Python/marshal.c
index 5617226..e0f138d 100644
--- a/Python/marshal.c
+++ b/Python/marshal.c
@@ -59,7 +59,7 @@
 static void
 w_more(int c, WFILE *p)
 {
-	int size, newsize;
+	Py_ssize_t size, newsize;
 	if (p->str == NULL)
 		return; /* An error already occurred */
 	size = PyString_Size(p->str);
@@ -117,7 +117,7 @@
 static void
 w_object(PyObject *v, WFILE *p)
 {
-	int i, n;
+	Py_ssize_t i, n;
 
 	p->depth++;
 
@@ -181,7 +181,7 @@
 		else {
 			char buf[256]; /* Plenty to format any double */
 			PyFloat_AsReprString(buf, (PyFloatObject *)v);
-			n = strlen(buf);
+			n = (int)strlen(buf);
 			w_byte(TYPE_FLOAT, p);
 			w_byte(n, p);
 			w_string(buf, n, p);
@@ -213,14 +213,14 @@
 				PyComplex_RealAsDouble(v));
 			PyFloat_AsReprString(buf, temp);
 			Py_DECREF(temp);
-			n = strlen(buf);
+			n = (int)strlen(buf);
 			w_byte(n, p);
 			w_string(buf, n, p);
 			temp = (PyFloatObject*)PyFloat_FromDouble(
 				PyComplex_ImagAsDouble(v));
 			PyFloat_AsReprString(buf, temp);
 			Py_DECREF(temp);
-			n = strlen(buf);
+			n = (int)strlen(buf);
 			w_byte(n, p);
 			w_string(buf, n, p);
 		}
@@ -236,7 +236,7 @@
 				goto exit;
 			}
 			else {
-				o = PyInt_FromLong(PyDict_Size(p->strings));
+				o = PyInt_FromSsize_t(PyDict_Size(p->strings));
 				PyDict_SetItem(p->strings, v, o);
 				Py_DECREF(o);
 				w_byte(TYPE_INTERNED, p);
@@ -282,7 +282,7 @@
 		}
 	}
 	else if (PyDict_Check(v)) {
-		int pos;
+		Py_ssize_t pos;
 		PyObject *key, *value;
 		w_byte(TYPE_DICT, p);
 		/* This one is NULL object terminated! */
@@ -395,9 +395,10 @@
 r_string(char *s, int n, RFILE *p)
 {
 	if (p->fp != NULL)
-		return fread(s, 1, n, p->fp);
+		/* The result fits into int because it must be <=n. */
+		return (int)fread(s, 1, n, p->fp);
 	if (p->end - p->ptr < n)
-		n = p->end - p->ptr;
+		n = (int)(p->end - p->ptr);
 	memcpy(s, p->ptr, n);
 	p->ptr += n;
 	return n;
@@ -939,7 +940,10 @@
 			pBuf = (char *)PyMem_MALLOC(filesize);
 		if (pBuf != NULL) {
 			PyObject* v;
-			size_t n = fread(pBuf, 1, filesize, fp);
+			size_t n;
+			/* filesize must fit into an int, because it
+			   is smaller than REASONABLE_FILE_LIMIT */
+			n = fread(pBuf, 1, (int)filesize, fp);
 			v = PyMarshal_ReadObjectFromString(pBuf, n);
 			if (pBuf != buf)
 				PyMem_FREE(pBuf);
@@ -970,7 +974,7 @@
 }
 
 PyObject *
-PyMarshal_ReadObjectFromString(char *str, int len)
+PyMarshal_ReadObjectFromString(char *str, Py_ssize_t len)
 {
 	RFILE rf;
 	PyObject *result;
diff --git a/Python/modsupport.c b/Python/modsupport.c
index 7241936..f92fc34 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -313,6 +313,11 @@
 				return PyInt_FromLong(n);
 		}
 		
+		case 'n':
+#if SIZEOF_SIZE_T!=SIZEOF_LONG
+			return PyLong_FromSsize_t(va_arg(*p_va, Py_Ssize_t));
+#endif
+			/* Fall through from 'n' to 'l' if Py_ssize_t is long */
 		case 'l':
 			return PyInt_FromLong(va_arg(*p_va, long));
 
@@ -371,7 +376,7 @@
 		case 'c':
 		{
 			char p[1];
-			p[0] = va_arg(*p_va, int);
+			p[0] = (char)va_arg(*p_va, int);
 			return PyString_FromStringAndSize(p, 1);
 		}
 
diff --git a/Python/pystrtod.c b/Python/pystrtod.c
index 3eccae8..83e792d 100644
--- a/Python/pystrtod.c
+++ b/Python/pystrtod.c
@@ -159,7 +159,7 @@
  **/
 char *
 PyOS_ascii_formatd(char       *buffer, 
-		   int         buf_len, 
+		   size_t      buf_len, 
 		   const char *format, 
 		   double      d)
 {
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 30cb518..0b7de42 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -939,7 +939,7 @@
 			nl = strchr(text, '\n');
 			if (nl == NULL || nl-text >= offset)
 				break;
-			offset -= (nl+1-text);
+			offset -= (int)(nl+1-text);
 			text = nl+1;
 		}
 		while (*text == ' ' || *text == '\t') {
diff --git a/Python/symtable.c b/Python/symtable.c
index 7e876d4..7f3f5db 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -426,7 +426,8 @@
 analyze_cells(PyObject *scope, PyObject *free)
 {
         PyObject *name, *v, *w;
-	int pos = 0, success = 0;
+	int success = 0;
+	Py_ssize_t pos = 0;
 
 	w = PyInt_FromLong(CELL);
 	if (!w)
@@ -507,7 +508,7 @@
                PyObject *bound, PyObject *free, int class)
 {
 	PyObject *name, *v, *u, *w, *free_value = NULL;
-	int pos = 0;
+	Py_ssize_t pos = 0;
 
 	while (PyDict_Next(symbols, &pos, &name, &v)) {
 		long i, flags;
@@ -583,7 +584,8 @@
 {
 	PyObject *name, *v, *local = NULL, *scope = NULL, *newbound = NULL;
 	PyObject *newglobal = NULL, *newfree = NULL;
-	int i, pos = 0, success = 0;
+	int i, success = 0;
+	Py_ssize_t pos = 0;
 
 	local = PyDict_New();
 	if (!local)
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index f793b99..b240cc7 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1279,7 +1279,7 @@
 	if (path != NULL) {
 		char *argv0 = argv[0];
 		char *p = NULL;
-		int n = 0;
+		Py_ssize_t n = 0;
 		PyObject *a;
 #ifdef HAVE_READLINK
 		char link[MAXPATHLEN+1];
diff --git a/Python/thread_nt.h b/Python/thread_nt.h
index 47c776f..e52d288 100644
--- a/Python/thread_nt.h
+++ b/Python/thread_nt.h
@@ -170,7 +170,7 @@
 long
 PyThread_start_new_thread(void (*func)(void *), void *arg)
 {
-	unsigned long rv;
+	uintptr_t rv;
 	callobj obj;
 
 	dprintf(("%ld: PyThread_start_new_thread called\n",
@@ -186,7 +186,7 @@
 		return -1;
 
 	rv = _beginthread(bootstrap, 0, &obj); /* use default stack size */
-	if (rv == (unsigned long)-1) {
+	if (rv == (uintptr_t)-1) {
 		/* I've seen errno == EAGAIN here, which means "there are
 		 * too many threads".
 		 */