--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cos/python/Objects/boolobject.c	Tue Dec 27 18:59:02 2011 +0100
@@ -0,0 +1,184 @@
+/* Boolean type, a subtype of int */
+
+#include "Python.h"
+#include "longintrepr.h"
+
+/* We define bool_repr to return "False" or "True" */
+
+static PyObject *false_str = NULL;
+static PyObject *true_str = NULL;
+
+static PyObject *
+bool_repr(PyObject *self)
+{
+    PyObject *s;
+
+    if (self == Py_True)
+        s = true_str ? true_str :
+            (true_str = PyUnicode_InternFromString("True"));
+    else
+        s = false_str ? false_str :
+            (false_str = PyUnicode_InternFromString("False"));
+    Py_XINCREF(s);
+    return s;
+}
+
+/* Function to return a bool from a C long */
+
+PyObject *PyBool_FromLong(long ok)
+{
+    PyObject *result;
+
+    if (ok)
+        result = Py_True;
+    else
+        result = Py_False;
+    Py_INCREF(result);
+    return result;
+}
+
+/* We define bool_new to always return either Py_True or Py_False */
+
+static PyObject *
+bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+    static char *kwlist[] = {"x", 0};
+    PyObject *x = Py_False;
+    long ok;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
+        return NULL;
+    ok = PyObject_IsTrue(x);
+    if (ok < 0)
+        return NULL;
+    return PyBool_FromLong(ok);
+}
+
+/* Arithmetic operations redefined to return bool if both args are bool. */
+
+static PyObject *
+bool_and(PyObject *a, PyObject *b)
+{
+    if (!PyBool_Check(a) || !PyBool_Check(b))
+        return PyLong_Type.tp_as_number->nb_and(a, b);
+    return PyBool_FromLong((a == Py_True) & (b == Py_True));
+}
+
+static PyObject *
+bool_or(PyObject *a, PyObject *b)
+{
+    if (!PyBool_Check(a) || !PyBool_Check(b))
+        return PyLong_Type.tp_as_number->nb_or(a, b);
+    return PyBool_FromLong((a == Py_True) | (b == Py_True));
+}
+
+static PyObject *
+bool_xor(PyObject *a, PyObject *b)
+{
+    if (!PyBool_Check(a) || !PyBool_Check(b))
+        return PyLong_Type.tp_as_number->nb_xor(a, b);
+    return PyBool_FromLong((a == Py_True) ^ (b == Py_True));
+}
+
+/* Doc string */
+
+PyDoc_STRVAR(bool_doc,
+"bool(x) -> bool\n\
+\n\
+Returns True when the argument x is true, False otherwise.\n\
+The builtins True and False are the only two instances of the class bool.\n\
+The class bool is a subclass of the class int, and cannot be subclassed.");
+
+/* Arithmetic methods -- only so we can override &, |, ^. */
+
+static PyNumberMethods bool_as_number = {
+    0,                          /* nb_add */
+    0,                          /* nb_subtract */
+    0,                          /* nb_multiply */
+    0,                          /* nb_remainder */
+    0,                          /* nb_divmod */
+    0,                          /* nb_power */
+    0,                          /* nb_negative */
+    0,                          /* nb_positive */
+    0,                          /* nb_absolute */
+    0,                          /* nb_bool */
+    0,                          /* nb_invert */
+    0,                          /* nb_lshift */
+    0,                          /* nb_rshift */
+    bool_and,                   /* nb_and */
+    bool_xor,                   /* nb_xor */
+    bool_or,                    /* nb_or */
+    0,                          /* nb_int */
+    0,                          /* nb_reserved */
+    0,                          /* nb_float */
+    0,                          /* nb_inplace_add */
+    0,                          /* nb_inplace_subtract */
+    0,                          /* nb_inplace_multiply */
+    0,                          /* nb_inplace_remainder */
+    0,                          /* nb_inplace_power */
+    0,                          /* nb_inplace_lshift */
+    0,                          /* nb_inplace_rshift */
+    0,                          /* nb_inplace_and */
+    0,                          /* nb_inplace_xor */
+    0,                          /* nb_inplace_or */
+    0,                          /* nb_floor_divide */
+    0,                          /* nb_true_divide */
+    0,                          /* nb_inplace_floor_divide */
+    0,                          /* nb_inplace_true_divide */
+    0,                          /* nb_index */
+};
+
+/* The type object for bool.  Note that this cannot be subclassed! */
+
+PyTypeObject PyBool_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "bool",
+    sizeof(struct _longobject),
+    0,
+    0,                                          /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_reserved */
+    bool_repr,                                  /* tp_repr */
+    &bool_as_number,                            /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    bool_repr,                                  /* tp_str */
+    0,                                          /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT,                         /* tp_flags */
+    bool_doc,                                   /* tp_doc */
+    0,                                          /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    &PyLong_Type,                               /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    bool_new,                                   /* tp_new */
+};
+
+/* The objects representing bool values False and True */
+
+struct _longobject _Py_FalseStruct = {
+    PyVarObject_HEAD_INIT(&PyBool_Type, 0)
+    { 0 }
+};
+
+struct _longobject _Py_TrueStruct = {
+    PyVarObject_HEAD_INIT(&PyBool_Type, 1)
+    { 1 }
+};