@deftypefun {int} {gnutls_x509_cidr_to_rfc5280} (const char * @var{cidr}, gnutls_datum_t * @var{cidr_rfc5280})
@var{cidr}: CIDR in RFC4632 format (IP/prefix), null-terminated

@var{cidr_rfc5280}: CIDR range converted to RFC5280 format

This function will convert text CIDR range with prefix (such as '10.0.0.0/8')
to RFC5280 (IP address in network byte order followed by its network mask).
Works for both IPv4 and IPv6.

The resulting object is directly usable for IP name constraints usage,
for example in functions @code{gnutls_x509_name_constraints_add_permitted} 
or @code{gnutls_x509_name_constraints_add_excluded} .

The data in datum needs to be deallocated using @code{gnutls_free()} .

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a negative error value.

@strong{Since:} 3.5.4
@end deftypefun