Function array_assign_subscript

numpy/core/src/multiarray/mapping.c:1777–2139

* General assignment with python indexing objects. */

 * General assignment with python indexing objects.
 */
static int
array_assign_subscript(PyArrayObject *self, PyObject *ind, PyObject *op)
{
    int index_type;
    int index_num;
    int i, ndim, fancy_ndim;
    PyArray_Descr *descr = PyArray_DESCR(self);
    PyArrayObject *view = NULL;
    PyArrayObject *tmp_arr = NULL;
    npy_index_info indices[NPY_MAXDIMS * 2 + 1];

    PyArrayMapIterObject *mit = NULL;

    /* When a subspace is used, casting is done manually. */
    NPY_cast_info cast_info = {.func = NULL};

    if (op == NULL) {
        PyErr_SetString(PyExc_ValueError,
                        "cannot delete array elements");
        return -1;
    }
    if (PyArray_FailUnlessWriteable(self, "assignment destination") < 0) {
        return -1;
    }

    /* field access */
    if (PyDataType_HASFIELDS(PyArray_DESCR(self))){
        PyArrayObject *view;
        int ret = _get_field_view(self, ind, &view);
        if (ret == 0){
            if (view == NULL) {
                return -1;
            }
            if (PyArray_CopyObject(view, op) < 0) {
                Py_DECREF(view);
                return -1;
            }
            Py_DECREF(view);
            return 0;
        }
    }

    /* Prepare the indices */
    index_type = prepare_index(self, ind, indices, &index_num,
                               &ndim, &fancy_ndim, 1);

    if (index_type < 0) {
        return -1;
    }

    /* Full integer index */
    if (index_type == HAS_INTEGER) {
        char *item;
        if (get_item_pointer(self, &item, indices, index_num) < 0) {
            return -1;
        }
        if (PyArray_Pack(PyArray_DESCR(self), item, op) < 0) {
            return -1;