if ((predef = psi_parser_open_string(cpp->parser, psi_cpp_predef, sizeof(psi_cpp_predef) - 1))) {
bool parsed = psi_parser_parse(cpp->parser, predef);
if ((predef = psi_parser_open_string(cpp->parser, psi_cpp_predef, sizeof(psi_cpp_predef) - 1))) {
bool parsed = psi_parser_parse(cpp->parser, predef);