Use Py_ssize_t to hold the 'width' argument to the ljust, rjust, center and

zfill stringmethods, so they can create strings larger than 2Gb on 64bit
systems (even win64.) The unicode versions of these methods already did this
right.

Objects/stringobject.c

@@ -2860,10 +2860,10 @@ PyDoc_STRVAR(ljust__doc__,
 static PyObject *
 string_ljust(PyStringObject *self, PyObject *args)
 {
-    int width;
+    Py_ssize_t width;
     char fillchar = ' ';
 
-    if (!PyArg_ParseTuple(args, "i|c:ljust", &width, &fillchar))
+    if (!PyArg_ParseTuple(args, "n|c:ljust", &width, &fillchar))
         return NULL;
 
     if (PyString_GET_SIZE(self) >= width && PyString_CheckExact(self)) {
@@ -2884,10 +2884,10 @@ PyDoc_STRVAR(rjust__doc__,
 static PyObject *
 string_rjust(PyStringObject *self, PyObject *args)
 {
-    int width;
+    Py_ssize_t width;
     char fillchar = ' ';
 
-    if (!PyArg_ParseTuple(args, "i|c:rjust", &width, &fillchar))
+    if (!PyArg_ParseTuple(args, "n|c:rjust", &width, &fillchar))
         return NULL;
 
     if (PyString_GET_SIZE(self) >= width && PyString_CheckExact(self)) {
@@ -2909,10 +2909,10 @@ static PyObject *
 string_center(PyStringObject *self, PyObject *args)
 {
     Py_ssize_t marg, left;
-    long width;
+    Py_ssize_t width;
     char fillchar = ' ';
 
-    if (!PyArg_ParseTuple(args, "l|c:center", &width, &fillchar))
+    if (!PyArg_ParseTuple(args, "n|c:center", &width, &fillchar))
         return NULL;
 
     if (PyString_GET_SIZE(self) >= width && PyString_CheckExact(self)) {
@@ -2938,9 +2938,9 @@ string_zfill(PyStringObject *self, PyObject *args)
     Py_ssize_t fill;
     PyObject *s;
     char *p;
+    Py_ssize_t width;
 
-    long width;
-    if (!PyArg_ParseTuple(args, "l:zfill", &width))
+    if (!PyArg_ParseTuple(args, "n:zfill", &width))
         return NULL;
 
     if (PyString_GET_SIZE(self) >= width) {