@subheading tld_check_4z
@anchor{tld_check_4z}
@deftypefun {int} {tld_check_4z} (const uint32_t * @var{in}, size_t * @var{errpos}, const Tld_table ** @var{overrides})
@var{in}: Zero-terminated array of unicode code points to process.

@var{errpos}: Position of offending character is returned here.

@var{overrides}: A @code{Tld_table}  array of additional domain restriction
structures that complement and supersede the built-in information.

Test each of the code points in  @code{in} for whether or not they are
allowed by the information in  @code{overrides} or by the built-in TLD
restriction data. When data for the same TLD is available both
internally and in  @code{overrides} , the information in  @code{overrides} takes
precedence. If several entries for a specific TLD are found, the
first one is used.  If  @code{overrides} is @code{NULL} , only the built-in
information is used.  The position of the first offending character
is returned in  @code{errpos} .

Return value: Returns the @code{Tld_rc}  value @code{TLD_SUCCESS}  if all code
points are valid or when  @code{tld} is null, @code{TLD_INVALID}  if a
character is not allowed, or additional error codes on general
failure conditions.
@end deftypefun

