gnutls_x509_trust_list_iter_get_ca - API function
int gnutls_x509_trust_list_iter_get_ca(gnutls_x509_trust_list_t list, gnutls_x509_trust_list_iter_t * iter, gnutls_x509_crt_t * crt);
This function obtains a certificate in the trust list and advances the iterator to the next certificate. The certificate returned in crt must be deallocated with gnutls_x509_crt_deinit().
When past the last element is accessed GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned and the iterator is reset.
The iterator is deinitialized and reset to NULL automatically by this function after iterating through all elements until GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned. If the iteration is aborted early, it must be manually deinitialized using gnutls_x509_trust_list_iter_deinit().
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
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