serial_port add set_stop_bits/get_stop_bits

Author: dongyaosheng

include/boost/cobalt/io/serial_port.hpp

@@ -46,6 +46,11 @@ struct BOOST_SYMBOL_VISIBLE serial_port final : stream
   [[nodiscard]] BOOST_COBALT_IO_DECL system::result<void>   set_parity(parity rate);
   [[nodiscard]] BOOST_COBALT_IO_DECL system::result<parity> get_parity();
 
+  using stop_bits = asio::serial_port_base::stop_bits::type;
+
+  [[nodiscard]] BOOST_COBALT_IO_DECL system::result<void>      set_stop_bits(stop_bits stop_bits);
+  [[nodiscard]] BOOST_COBALT_IO_DECL system::result<stop_bits> get_stop_bits();
+
   using native_handle_type = typename asio::basic_serial_port<executor>::native_handle_type;
   native_handle_type native_handle() {return serial_port_.native_handle();}
 

src/io/serial_port.cpp

@@ -95,6 +95,21 @@ auto serial_port::get_parity() -> system::result<parity>
   return ec ? ec : system::result<parity>(br.value());
 }
 
+system::result<void>     serial_port::set_stop_bits(stop_bits stop_bits)
+{
+  system::error_code ec;
+  serial_port_.set_option(asio::serial_port_base::stop_bits(stop_bits), ec);
+  return ec ? ec : boost::system::result<void>();
+}
+
+auto serial_port::get_stop_bits() -> system::result<stop_bits>
+{
+  system::error_code ec;
+  asio::serial_port_base::stop_bits sb;
+  serial_port_.get_option(sb, ec);
+  return ec ? ec : boost::system::result<stop_bits>(sb.value());
+}
+
 serial_port::serial_port(const cobalt::executor & executor)
     : serial_port_(executor) {}
 serial_port::serial_port(std::string_view device, const cobalt::executor & executor)