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Issue #27867: Function PySlice_GetIndicesEx() is deprecated and replaced with

Browse source 
a macro if Py_LIMITED_API is not set or set to the value between 0x03050400
and 0x03060000 (not including) or 0x03060100 or higher.  Added functions
PySlice_Unpack() and PySlice_AdjustIndices().
This commit is contained in:
Serhiy Storchaka 2017-01-25 13:27:44 +02:00
commit 6e08baf12d
6 changed files with 119 additions and 26 deletions
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78
Objects/sliceobject.c
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@ -191,15 +191,12 @@ PySlice_GetIndices(PyObject *_r, Py_ssize_t length,
}
int
PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
Py_ssize_t *slicelength)
PySlice_Unpack(PyObject *_r,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
{
PySliceObject *r = (PySliceObject*)_r;
/* this is harder to get right than you might think */
Py_ssize_t defstart, defstop;
if (r->step == Py_None) {
*step = 1;
}
@ -219,42 +216,75 @@ PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
*step = -PY_SSIZE_T_MAX;
}
defstart = *step < 0 ? length-1 : 0;
defstop = *step < 0 ? -1 : length;
if (r->start == Py_None) {
*start = defstart;
*start = *step < 0 ? PY_SSIZE_T_MAX-1 : 0;;
}
else {
if (!_PyEval_SliceIndex(r->start, start)) return -1;
if (*start < 0) *start += length;
if (*start < 0) *start = (*step < 0) ? -1 : 0;
if (*start >= length)
*start = (*step < 0) ? length - 1 : length;
}
if (r->stop == Py_None) {
*stop = defstop;
*stop = *step < 0 ? -PY_SSIZE_T_MAX : PY_SSIZE_T_MAX;
}
else {
if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
if (*stop < 0) *stop += length;
if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
if (*stop >= length)
*stop = (*step < 0) ? length - 1 : length;
}
if ((*step < 0 && *stop >= *start)
|| (*step > 0 && *start >= *stop)) {
*slicelength = 0;
return 0;
}
Py_ssize_t
PySlice_AdjustIndices(Py_ssize_t length,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)
{
/* this is harder to get right than you might think */
assert(step != 0);
assert(step >= -PY_SSIZE_T_MAX);
if (*start < 0) {
*start += length;
if (*start < 0) {
*start = (step < 0) ? -1 : 0;
}
}
else if (*step < 0) {
*slicelength = (*stop-*start+1)/(*step)+1;
else if (*start >= length) {
*start = (step < 0) ? length - 1 : length;
}
if (*stop < 0) {
*stop += length;
if (*stop < 0) {
*stop = (step < 0) ? -1 : 0;
}
}
else if (*stop >= length) {
*stop = (step < 0) ? length - 1 : length;
}
if (step < 0) {
if (*stop < *start) {
return (*start - *stop - 1) / (-step) + 1;
}
}
else {
*slicelength = (*stop-*start-1)/(*step)+1;
if (*start < *stop) {
return (*stop - *start - 1) / step + 1;
}
}
return 0;
}
#undef PySlice_GetIndicesEx
int
PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
Py_ssize_t *slicelength)
{
if (PySlice_Unpack(_r, start, stop, step) < 0)
return -1;
*slicelength = PySlice_AdjustIndices(length, start, stop, *step);
return 0;
}