Function PyArray_OverflowMultiplyList

numpy/core/src/multiarray/multiarraymodule.c:196–213

NUMPY_API * Multiply a List of Non-negative numbers with over-flow detection. */

 * Multiply a List of Non-negative numbers with over-flow detection.
 */
NPY_NO_EXPORT npy_intp
PyArray_OverflowMultiplyList(npy_intp const *l1, int n)
{
    npy_intp prod = 1;
    int i;

    for (i = 0; i < n; i++) {
        npy_intp dim = l1[i];

        if (dim == 0) {
            return 0;
        }
        if (npy_mul_sizes_with_overflow(&prod, prod, dim)) {
            return -1;
        }
    }
    return prod;
}

/*NUMPY_API
 * Produce a pointer into array