+=head1 RETURN VALUES
+
+ASN1_STRING_print_ex() and ASN1_STRING_print_ex_fp() return the number of
+characters written or -1 if an error occurred.
+
+ASN1_STRING_print() returns 1 on success or 0 on error.
+
+ASN1_tag2str() returns a human-readable name of the specified ASN.1 B<tag>.
+