56    start, stop, and step are python objects with None indicating no
61 PySlice_New(PyObject *start, PyObject *stop, PyObject *step)  in PySlice_New()  argument
70     if (start == NULL) start = Py_None;  in PySlice_New()
71     Py_INCREF(start);  in PySlice_New()
76     obj->start = start;  in PySlice_New()
86     PyObject *start, *end, *slice;  in _PySlice_FromIndices()  local
87     start = PyInt_FromSsize_t(istart);  in _PySlice_FromIndices()
88     if (!start)  in _PySlice_FromIndices()
92         Py_DECREF(start);  in _PySlice_FromIndices()
96     slice = PySlice_New(start, end, NULL);  in _PySlice_FromIndices()
97     Py_DECREF(start);  in _PySlice_FromIndices()
104                    Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)  in PySlice_GetIndices()  argument
113     if (r->start == Py_None) {  in PySlice_GetIndices()
114         *start = *step < 0 ? length-1 : 0;  in PySlice_GetIndices()
116         if (!PyInt_Check(r->start) && !PyLong_Check(r->step)) return -1;  in PySlice_GetIndices()
117         *start = PyInt_AsSsize_t(r->start);  in PySlice_GetIndices()
118         if (*start < 0) *start += length;  in PySlice_GetIndices()
128     if (*start >= length) return -1;  in PySlice_GetIndices()
135                      Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step, Py_ssize_t *slicelength)  in PySlice_GetIndicesEx()  argument
156     if (r->start == Py_None) {  in PySlice_GetIndicesEx()
157         *start = defstart;  in PySlice_GetIndicesEx()
160         if (!_PyEval_SliceIndex(r->start, start)) return -1;  in PySlice_GetIndicesEx()
161         if (*start < 0) *start += length;  in PySlice_GetIndicesEx()
162         if (*start < 0) *start = (*step < 0) ? -1 : 0;  in PySlice_GetIndicesEx()
163         if (*start >= length)  in PySlice_GetIndicesEx()
164             *start = (*step < 0) ? length - 1 : length;  in PySlice_GetIndicesEx()
178     if ((*step < 0 && *stop >= *start)  in PySlice_GetIndicesEx()
179         || (*step > 0 && *start >= *stop)) {  in PySlice_GetIndicesEx()
183         *slicelength = (*stop-*start+1)/(*step)+1;  in PySlice_GetIndicesEx()
186         *slicelength = (*stop-*start-1)/(*step)+1;  in PySlice_GetIndicesEx()
195     PyObject *start, *stop, *step;  in slice_new()  local
197     start = stop = step = NULL;  in slice_new()
202     if (!PyArg_UnpackTuple(args, "slice", 1, 3, &start, &stop, &step))  in slice_new()
205     /* This swapping of stop and start is to maintain similarity with  in slice_new()
208         stop = start;  in slice_new()
209         start = NULL;  in slice_new()
211     return PySlice_New(start, stop, step);  in slice_new()
216 slice(start, stop[, step])\n\
225     Py_DECREF(r->start);  in slice_dealloc()
237     PyString_ConcatAndDel(&s, PyObject_Repr(r->start));  in slice_repr()
248     {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
257     Py_ssize_t ilen, start, stop, step, slicelength;  in slice_indices()  local
265     if (PySlice_GetIndicesEx(self, ilen, &start, &stop,  in slice_indices()
270     return Py_BuildValue("(nnn)", start, stop, step);  in slice_indices()
274 "S.indices(len) -> (start, stop, stride)\n\
276 Assuming a sequence of length len, calculate the start and stop\n\
284     return Py_BuildValue("O(OOO)", Py_TYPE(self), self->start, self->stop, self->step);  in slice_reduce()
305     if (PyObject_Cmp(v->start, w->start, &result) < 0)  in slice_compare()
328     Py_VISIT(v->start);  in slice_traverse()