Function parse_and_intersect_capabilities

python/stringzilla.c:7666–7704

#pragma endregion

static int parse_and_intersect_capabilities(PyObject *caps_obj, sz_capability_t *result) {
    if (!caps_obj) {
        PyErr_SetString(PyExc_TypeError, "capabilities must be a tuple or list of strings");
        return -1;
    }
    PyObject *seq = PySequence_Fast(caps_obj, "capabilities must be a tuple or list of strings");
    if (!seq) return -1;

    sz_capability_t requested_caps = 0;
    Py_ssize_t n = PySequence_Fast_GET_SIZE(seq);
    PyObject **items = PySequence_Fast_ITEMS(seq);

    for (Py_ssize_t i = 0; i < n; i++) {
        PyObject *item = items[i];
        if (!PyUnicode_Check(item)) {
            PyErr_SetString(PyExc_TypeError, "capabilities must be strings");
            Py_DECREF(seq);
            return -1;
        }
        char const *cap_str = PyUnicode_AsUTF8(item);
        if (!cap_str) {
            Py_DECREF(seq);
            return -1;
        }
        sz_capability_t flag = sz_capability_from_string_implementation_(cap_str);
        if (flag == sz_caps_none_k) {
            PyErr_Format(PyExc_ValueError, "Unknown capability: %s", cap_str);
            Py_DECREF(seq);
            return -1;
        }
        requested_caps |= flag;
    }
    Py_DECREF(seq);

    // Intersect with hardware capabilities for safety
    *result = requested_caps & sz_capabilities();
    if (*result == 0) { *result = sz_cap_serial_k; }
    return 0;
}

static char const doc_reset_capabilities[] = //
    "reset_capabilities(names) -> None\n\n"