@deftypefun {int} {gnutls_x509_trust_list_add_cas} (gnutls_x509_trust_list_t @var{list}, const gnutls_x509_crt_t * @var{clist}, unsigned @var{clist_size}, unsigned int @var{flags})
@var{list}: The list

@var{clist}: A list of CAs

@var{clist_size}: The length of the CA list

@var{flags}: flags from @code{gnutls_trust_list_flags_t} 

This function will add the given certificate authorities
to the trusted list. The CAs in  @code{clist} must not be deinitialized
during the lifetime of  @code{list} .

If the flag @code{GNUTLS_TL_NO_DUPLICATES}  is specified, then
this function will ensure that no duplicates will be
present in the final trust list.

If the flag @code{GNUTLS_TL_NO_DUPLICATE_KEY}  is specified, then
this function will ensure that no certificates with the
same key are present in the final trust list.

If either @code{GNUTLS_TL_NO_DUPLICATE_KEY}  or @code{GNUTLS_TL_NO_DUPLICATES} 
are given, @code{gnutls_x509_trust_list_deinit()}  must be called with parameter
 @code{all} being 1.

@strong{Returns:} The number of added elements is returned; that includes
duplicate entries.

@strong{Since:} 3.0.0
@end deftypefun