Function Str_like_utf8_case_insensitive_find

python/stringzilla.c:3519–3695

    "    0";

static PyObject *Str_like_utf8_case_insensitive_find(PyObject *self, PyObject *const *args,
                                                     Py_ssize_t positional_args_count, PyObject *args_names_tuple) {
    int const is_member = self != NULL && PyObject_TypeCheck(self, &StrType);

    // Argument objects
    PyObject *haystack_obj = NULL;
    PyObject *needle_obj = NULL;
    PyObject *start_obj = NULL;
    PyObject *end_obj = NULL;
    int validate = 0;

    // Argument count validation
    Py_ssize_t const args_names_count = args_names_tuple ? PyTuple_GET_SIZE(args_names_tuple) : 0;
    Py_ssize_t const total_args = positional_args_count + args_names_count;
    Py_ssize_t const expected_min = is_member ? 1 : 2; // needle required
    Py_ssize_t const expected_max = expected_min + 3;  // + start + end + validate

    if (total_args < expected_min || total_args > expected_max) {
        PyErr_SetString(PyExc_TypeError, "Invalid number of arguments");
        return NULL;
    }

    // Extract positional arguments
    if (is_member) {
        haystack_obj = self;
        if (positional_args_count >= 1) needle_obj = args[0];
        if (positional_args_count >= 2) start_obj = args[1];
        if (positional_args_count >= 3) end_obj = args[2];
    }
    else {
        if (positional_args_count >= 1) haystack_obj = args[0];
        if (positional_args_count >= 2) needle_obj = args[1];
        if (positional_args_count >= 3) start_obj = args[2];
        if (positional_args_count >= 4) end_obj = args[3];
    }

    // Parse keyword arguments
    for (Py_ssize_t i = 0; i < args_names_count; ++i) {
        PyObject *key = PyTuple_GET_ITEM(args_names_tuple, i);
        PyObject *val = args[positional_args_count + i];

        if (PyUnicode_CompareWithASCIIString(key, "start") == 0) {
            if (start_obj) {
                PyErr_SetString(PyExc_TypeError, "start specified twice");
                return NULL;
            }
            start_obj = val;
        }
        else if (PyUnicode_CompareWithASCIIString(key, "end") == 0) {
            if (end_obj) {
                PyErr_SetString(PyExc_TypeError, "end specified twice");
                return NULL;
            }
            end_obj = val;
        }
        else if (PyUnicode_CompareWithASCIIString(key, "validate") == 0) {
            validate = PyObject_IsTrue(val);
            if (validate < 0) return NULL;