Disallow keyword arguments for type constructors that don't use them.

(fixes bug #1119418)

Include/modsupport.h

@@ -15,6 +15,7 @@ PyAPI_FUNC(int) PyArg_ParseTupleAndKeywords(PyObject *, PyObject *,
                                                   char *, char **, ...);
 PyAPI_FUNC(int) PyArg_UnpackTuple(PyObject *, char *, int, int, ...);
 PyAPI_FUNC(PyObject *) Py_BuildValue(char *, ...);
+PyAPI_FUNC(int) _PyArg_NoKeywords(char *funcname, PyObject *kw);
 
 PyAPI_FUNC(int) PyArg_VaParse(PyObject *, char *, va_list);
 PyAPI_FUNC(int) PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *,

Misc/NEWS

@@ -12,6 +12,9 @@ What's New in Python 2.5 alpha 1?
 Core and builtins
 -----------------
 
+- Disallow keyword arguments for type constructors that don't use it
+  (fixes bug #1119418).
+
 - Forward UnicodeDecodeError into SyntaxError for source encoding errors.
 
 - SF bug #900092: When tracing (e.g. for hotshot), restore 'return' events for

Modules/_randommodule.c

@@ -481,6 +481,9 @@ random_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	RandomObject *self;
 	PyObject *tmp;
 
+	if (!_PyArg_NoKeywords("Random()", kwds))
+		return NULL;
+
 	self = (RandomObject *)type->tp_alloc(type, 0);
 	if (self == NULL)
 		return NULL;

Modules/arraymodule.c

@@ -1800,17 +1800,8 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *initial = NULL, *it = NULL;
 	struct arraydescr *descr;
 	
-	if (kwds != NULL) {
-		int i = PyObject_Length(kwds);
-		if (i < 0)
+	if (!_PyArg_NoKeywords("array.array()", kwds))
 		return NULL;
-		else if (i > 0) {
-			PyErr_SetString(PyExc_TypeError,
-			    "array.array constructor takes "
-			    "no keyword arguments");
-			return NULL;
-		}
-	}
 
 	if (!PyArg_ParseTuple(args, "c|O:array", &c, &initial))
 		return NULL;

Modules/collectionsmodule.c

@@ -95,6 +95,9 @@ deque_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	dequeobject *deque;
 	block *b;
 
+	if (!_PyArg_NoKeywords("deque()", kwds))
+		return NULL;
+
 	/* create dequeobject structure */
 	deque = (dequeobject *)type->tp_alloc(type, 0);
 	if (deque == NULL)

Modules/itertoolsmodule.c

@@ -618,6 +618,9 @@ cycle_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *saved;
 	cycleobject *lz;
 
+	if (!_PyArg_NoKeywords("cycle()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable))
 		return NULL;
 
@@ -765,6 +768,9 @@ dropwhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *it;
 	dropwhileobject *lz;
 
+	if (!_PyArg_NoKeywords("dropwhile()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "dropwhile", 2, 2, &func, &seq))
 		return NULL;
 
@@ -906,6 +912,9 @@ takewhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *it;
 	takewhileobject *lz;
 
+	if (!_PyArg_NoKeywords("takewhile()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "takewhile", 2, 2, &func, &seq))
 		return NULL;
 
@@ -1048,6 +1057,9 @@ islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	int numargs;
 	isliceobject *lz;
 
+	if (!_PyArg_NoKeywords("islice()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "islice", 2, 4, &seq, &a1, &a2, &a3))
 		return NULL;
 
@@ -1236,6 +1248,9 @@ starmap_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *it;
 	starmapobject *lz;
 
+	if (!_PyArg_NoKeywords("starmap()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "starmap", 2, 2, &func, &seq))
 		return NULL;
 
@@ -1365,6 +1380,9 @@ imap_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	imapobject *lz;
 	int numargs, i;
 
+	if (!_PyArg_NoKeywords("imap()", kwds))
+		return NULL;
+
 	numargs = PyTuple_Size(args);
 	if (numargs < 2) {
 		PyErr_SetString(PyExc_TypeError,
@@ -1544,6 +1562,9 @@ chain_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	int i;
 	PyObject *ittuple;
 
+	if (!_PyArg_NoKeywords("chain()", kwds))
+		return NULL;
+
 	/* obtain iterators */
 	assert(PyTuple_Check(args));
 	ittuple = PyTuple_New(tuplesize);
@@ -1684,6 +1705,9 @@ ifilter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *it;
 	ifilterobject *lz;
 
+	if (!_PyArg_NoKeywords("ifilter()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "ifilter", 2, 2, &func, &seq))
 		return NULL;
 
@@ -1825,6 +1849,9 @@ ifilterfalse_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *it;
 	ifilterfalseobject *lz;
 
+	if (!_PyArg_NoKeywords("ifilterfalse()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "ifilterfalse", 2, 2, &func, &seq))
 		return NULL;
 
@@ -1964,6 +1991,9 @@ count_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	countobject *lz;
 	long cnt = 0;
 
+	if (!_PyArg_NoKeywords("count()", kwds))
+		return NULL;
+
 	if (!PyArg_ParseTuple(args, "|l:count", &cnt))
 		return NULL;
 
@@ -2060,6 +2090,9 @@ izip_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *result;
 	int tuplesize = PySequence_Length(args);
 
+	if (!_PyArg_NoKeywords("izip()", kwds))
+		return NULL;
+
 	/* args must be a tuple */
 	assert(PyTuple_Check(args));
 
@@ -2240,6 +2273,9 @@ repeat_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *element;
 	long cnt = -1;
 
+	if (!_PyArg_NoKeywords("repeat()", kwds))
+		return NULL;
+
 	if (!PyArg_ParseTuple(args, "O|l:repeat", &element, &cnt))
 		return NULL;
 

Modules/operator.c

@@ -269,6 +269,9 @@ itemgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *item;
 	int nitems;
 
+	if (!_PyArg_NoKeywords("itemgetter()", kwds))
+		return NULL;
+
 	nitems = PyTuple_GET_SIZE(args);
 	if (nitems <= 1) {
 		if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &item))
@@ -405,6 +408,9 @@ attrgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	PyObject *attr;
 	int nattrs;
 
+	if (!_PyArg_NoKeywords("attrgetter()", kwds))
+		return NULL;
+
 	nattrs = PyTuple_GET_SIZE(args);
 	if (nattrs <= 1) {
 		if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &attr))

Modules/zipimport.c

@@ -65,6 +65,9 @@ zipimporter_init(ZipImporter *self, PyObject *args, PyObject *kwds)
 	char *path, *p, *prefix, buf[MAXPATHLEN+2];
 	int len;
 
+	if (!_PyArg_NoKeywords("zipimporter()", kwds))
+		return -1;
+
 	if (!PyArg_ParseTuple(args, "s:zipimporter",
 			      &path))
 		return -1;

Objects/bufferobject.c

@@ -192,6 +192,9 @@ buffer_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 	int offset = 0;
 	int size = Py_END_OF_BUFFER;
 
+	if (!_PyArg_NoKeywords("buffer()", kw))
+		return NULL;
+
 	if (!PyArg_ParseTuple(args, "O|ii:buffer", &ob, &offset, &size))
 	    return NULL;
 	return PyBuffer_FromObject(ob, offset, size);

Objects/rangeobject.c

@@ -45,6 +45,9 @@ range_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 	long ilow = 0, ihigh = 0, istep = 1;
 	long n;
 
+	if (!_PyArg_NoKeywords("xrange()", kw))
+		return NULL;
+
 	if (PyTuple_Size(args) <= 1) {
 		if (!PyArg_ParseTuple(args,
 				"l;xrange() requires 1-3 int arguments",

Objects/setobject.c

@@ -935,6 +935,9 @@ frozenset_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
 	PyObject *iterable = NULL, *result;
 
+	if (!_PyArg_NoKeywords("frozenset()", kwds))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, type->tp_name, 0, 1, &iterable))
 		return NULL;
 
@@ -976,6 +979,9 @@ PySet_Fini(void)
 static PyObject *
 set_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
+	if (!_PyArg_NoKeywords("set()", kwds))
+		return NULL;
+	
 	return make_new_set(type, NULL);
 }
 

Objects/sliceobject.c

@@ -174,6 +174,9 @@ slice_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 
 	start = stop = step = NULL;
 
+	if (!_PyArg_NoKeywords("slice()", kw))
+		return NULL;
+
 	if (!PyArg_UnpackTuple(args, "slice", 1, 3, &start, &stop, &step))
 		return NULL;
 

Python/getargs.c

@@ -1595,3 +1595,29 @@ PyArg_UnpackTuple(PyObject *args, char *name, int min, int max, ...)
 	va_end(vargs);
 	return 1;
 }
+
+
+/* For type constructors that don't take keyword args
+ *
+ * Sets a TypeError and returns 0 if the kwds dict is 
+ * not emtpy, returns 1 otherwise
+ */
+int
+_PyArg_NoKeywords(char *funcname, PyObject *kw)
+{
+	if (kw == NULL)
+		return 1;
+	if (!PyDict_CheckExact(kw)) {
+		PyErr_BadInternalCall();
+		return 0;
+	}
+	if (PyDict_Size(kw) == 0)
+		return 1;
+	
+	PyErr_Format(PyExc_TypeError, "%s does not take keyword arguments", 
+			funcname);
+	return 0;
+}
+
+
+