Issue #27867: Function PySlice_GetIndicesEx() is replaced with a macro if
Py_LIMITED_API is not set or set to the value between 0x03050400 and 0x03060000 (not including) or 0x03060100 or higher.
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@ -41,8 +41,20 @@ PyAPI_FUNC(int) _PySlice_GetLongIndices(PySliceObject *self, PyObject *length,
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PyAPI_FUNC(int) PySlice_GetIndices(PyObject *r, Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step);
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PyAPI_FUNC(int) PySlice_GetIndicesEx(PyObject *r, Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop,
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Py_ssize_t *step, Py_ssize_t *slicelength);
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Py_ssize_t *start, Py_ssize_t *stop,
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Py_ssize_t *step, Py_ssize_t *slicelength);
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#if !defined(Py_LIMITED_API) || (Py_LIMITED_API+0 >= 0x03050400 && Py_LIMITED_API+0 < 0x03060000) || Py_LIMITED_API+0 >= 0x03060100
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#define PySlice_GetIndicesEx(slice, length, start, stop, step, slicelen) ( \
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PySlice_Unpack((slice), (start), (stop), (step)) < 0 ? -1 : \
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((*slicelen = PySlice_AdjustIndices((length), (start), (stop), *(step))), \
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0))
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PyAPI_FUNC(int) PySlice_Unpack(PyObject *slice,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step);
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PyAPI_FUNC(Py_ssize_t) PySlice_AdjustIndices(Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop,
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Py_ssize_t step);
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#endif
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#ifdef __cplusplus
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}
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@ -40,6 +40,10 @@ Library
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C API
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-----
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- Issue #27867: Function PySlice_GetIndicesEx() is replaced with a macro if
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Py_LIMITED_API is not set or set to the value between 0x03050400
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and 0x03060000 (not including) or 0x03060100 or higher.
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- Issue #29083: Fixed the declaration of some public API functions.
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PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not available in
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limited API. PyArg_ValidateKeywordArguments(), PyArg_UnpackTuple() and
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@ -191,15 +191,12 @@ PySlice_GetIndices(PyObject *_r, Py_ssize_t length,
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}
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int
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PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
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Py_ssize_t *slicelength)
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PySlice_Unpack(PyObject *_r,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
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{
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PySliceObject *r = (PySliceObject*)_r;
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/* this is harder to get right than you might think */
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Py_ssize_t defstart, defstop;
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if (r->step == Py_None) {
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*step = 1;
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}
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@ -219,42 +216,75 @@ PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
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*step = -PY_SSIZE_T_MAX;
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}
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defstart = *step < 0 ? length-1 : 0;
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defstop = *step < 0 ? -1 : length;
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if (r->start == Py_None) {
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*start = defstart;
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*start = *step < 0 ? PY_SSIZE_T_MAX-1 : 0;;
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}
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else {
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if (!_PyEval_SliceIndex(r->start, start)) return -1;
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if (*start < 0) *start += length;
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if (*start < 0) *start = (*step < 0) ? -1 : 0;
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if (*start >= length)
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*start = (*step < 0) ? length - 1 : length;
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}
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if (r->stop == Py_None) {
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*stop = defstop;
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*stop = *step < 0 ? -PY_SSIZE_T_MAX : PY_SSIZE_T_MAX;
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}
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else {
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if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
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if (*stop < 0) *stop += length;
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if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
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if (*stop >= length)
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*stop = (*step < 0) ? length - 1 : length;
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}
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if ((*step < 0 && *stop >= *start)
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|| (*step > 0 && *start >= *stop)) {
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*slicelength = 0;
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return 0;
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}
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Py_ssize_t
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PySlice_AdjustIndices(Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)
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{
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/* this is harder to get right than you might think */
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assert(step != 0);
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assert(step >= -PY_SSIZE_T_MAX);
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if (*start < 0) {
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*start += length;
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if (*start < 0) {
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*start = (step < 0) ? -1 : 0;
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}
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}
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else if (*step < 0) {
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*slicelength = (*stop-*start+1)/(*step)+1;
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else if (*start >= length) {
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*start = (step < 0) ? length - 1 : length;
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}
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if (*stop < 0) {
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*stop += length;
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if (*stop < 0) {
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*stop = (step < 0) ? -1 : 0;
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}
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}
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else if (*stop >= length) {
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*stop = (step < 0) ? length - 1 : length;
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}
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if (step < 0) {
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if (*stop < *start) {
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return (*start - *stop - 1) / (-step) + 1;
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}
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}
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else {
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*slicelength = (*stop-*start-1)/(*step)+1;
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if (*start < *stop) {
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return (*stop - *start - 1) / step + 1;
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}
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}
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return 0;
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}
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#undef PySlice_GetIndicesEx
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int
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PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
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Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
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Py_ssize_t *slicelength)
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{
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if (PySlice_Unpack(_r, start, stop, step) < 0)
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return -1;
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*slicelength = PySlice_AdjustIndices(length, start, stop, *step);
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return 0;
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}
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@ -527,10 +527,12 @@ EXPORTS
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PySet_Pop=python35.PySet_Pop
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PySet_Size=python35.PySet_Size
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PySet_Type=python35.PySet_Type DATA
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PySlice_AdjustIndices=python35.PySlice_AdjustIndices
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PySlice_GetIndices=python35.PySlice_GetIndices
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PySlice_GetIndicesEx=python35.PySlice_GetIndicesEx
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PySlice_New=python35.PySlice_New
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PySlice_Type=python35.PySlice_Type DATA
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PySlice_Unpack=python35.PySlice_Unpack
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PySortWrapper_Type=python35.PySortWrapper_Type DATA
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PyState_AddModule=python35.PyState_AddModule
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PyState_FindModule=python35.PyState_FindModule
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