1429                  Py_ssize_t how_many, int check_maxchar)  in _copy_characters()  argument
1434     assert(0 <= how_many);  in _copy_characters()
1439     assert(from_start + how_many <= PyUnicode_GET_LENGTH(from));  in _copy_characters()
1443     assert(to_start + how_many <= PyUnicode_GET_LENGTH(to));  in _copy_characters()
1445     if (how_many == 0)  in _copy_characters()
1460         for (i=0; i < how_many; i++) {  in _copy_characters()
1475                                              (Py_UCS1*)from_data + how_many);  in _copy_characters()
1481                   to_kind * how_many);  in _copy_characters()
1489             PyUnicode_1BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1499             PyUnicode_1BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1509             PyUnicode_2BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1523                     PyUnicode_2BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1533                     PyUnicode_4BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1543                     PyUnicode_4BYTE_DATA(from) + from_start + how_many,  in _copy_characters()
1556             for (i=0; i < how_many; i++) {  in _copy_characters()
1570     PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many)  in _PyUnicode_FastCopyCharacters()  argument
1572     (void)_copy_characters(to, to_start, from, from_start, how_many, 0);  in _PyUnicode_FastCopyCharacters()
1578                          Py_ssize_t how_many)  in PyUnicode_CopyCharacters()  argument
1600     if (how_many < 0) {  in PyUnicode_CopyCharacters()
1604     how_many = Py_MIN(PyUnicode_GET_LENGTH(from)-from_start, how_many);  in PyUnicode_CopyCharacters()
1605     if (to_start + how_many > PyUnicode_GET_LENGTH(to)) {  in PyUnicode_CopyCharacters()
1609                      how_many, to_start, PyUnicode_GET_LENGTH(to));  in PyUnicode_CopyCharacters()
1613     if (how_many == 0)  in PyUnicode_CopyCharacters()
1619     err = _copy_characters(to, to_start, from, from_start, how_many, 1);  in PyUnicode_CopyCharacters()
1628     return how_many;  in PyUnicode_CopyCharacters()