Forward-port of r52136,52138: a review of overflow-detecting code.

* unified the way intobject, longobject and mystrtoul handle
  values around -sys.maxint-1.

* in general, trying to entierely avoid overflows in any computation
  involving signed ints or longs is extremely involved.  Fixed a few
  simple cases where a compiler might be too clever (but that's all
  guesswork).

* more overflow checks against bad data in marshal.c.

* 2.5 specific: fixed a number of places that were still confusing int
  and Py_ssize_t.  Some of them could potentially have caused
  "real-world" breakage.

* list.pop(x): fixing overflow issues on x was messy.  I just reverted
  to PyArg_ParseTuple("n"), which does the right thing.  (An obscure
  test was trying to give a Decimal to list.pop()... doesn't make
  sense any more IMHO)

* trying to write a few tests...

1 files changed, 3 insertions, 8 deletions

diff --git a/Objects/listobject.c b/Objects/listobject.c
index ef3700f..bf4466a 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -863,17 +863,12 @@ static PyObject *
 listpop(PyListObject *self, PyObject *args)
 {
 	Py_ssize_t i = -1;
-	PyObject *v, *arg = NULL;
+	PyObject *v;
 	int status;
 
-	if (!PyArg_UnpackTuple(args, "pop", 0, 1, &arg))
+	if (!PyArg_ParseTuple(args, "|n:pop", &i))
 		return NULL;
-	if (arg != NULL) {
-		if (PyInt_Check(arg))
-			i = PyInt_AS_LONG((PyIntObject*) arg);
-		else if (!PyArg_ParseTuple(args, "|n:pop", &i))
-   			return NULL;
-	}
+
 	if (self->ob_size == 0) {
 		/* Special-case most common failure cause */
 		PyErr_SetString(PyExc_IndexError, "pop from empty list");