Function _array_descr_walk

numpy/core/src/multiarray/hashdescr.c:232–255

* 'Root' function to walk into a dtype. May be called recursively */

 * 'Root' function to walk into a dtype. May be called recursively
 */
static int _array_descr_walk(PyArray_Descr* descr, PyObject *l)
{
    int st;

    if (_is_array_descr_builtin(descr)) {
        return _array_descr_builtin(descr, l);
    }
    else {
        if(descr->fields != NULL && descr->fields != Py_None) {
            st = _array_descr_walk_fields(descr->names, descr->fields, l);
            if (st) {
                return -1;
            }
        }
        if(PyDataType_HASSUBARRAY(descr)) {
            st = _array_descr_walk_subarray(descr->subarray, l);
            if (st) {
                return -1;
            }
        }
    }

    return 0;
}

/*
 * Return 0 if successful