Add client

stm.cpp

@@ -0,0 +1,186 @@
+#include <locale.h>
+#include <string.h>
+#include <langinfo.h>
+#include <termios.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <pty.h>
+#include <stdlib.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <signal.h>
+#include <sys/signalfd.h>
+
+#include "networktransport.hpp"
+#include "completeterminal.hpp"
+#include "swrite.hpp"
+#include "user.hpp"
+
+void client( const char *ip, int port, const char *key );
+
+using namespace std;
+
+int main( int argc, char *argv[] )
+{
+  /* Get arguments */
+  char *ip, *key;
+  int port;
+
+  if ( argc != 4 ) {
+    fprintf( stderr, "Usage: %s IP PORT KEY\n", argv[ 0 ] );
+    exit( 1 );
+  }
+
+  ip = argv[ 1 ];
+  port = atoi( argv[ 2 ] );
+  key = argv[ 3 ];
+
+  struct termios saved_termios, raw_termios;
+
+  /* Adopt implementation locale */
+  if ( NULL == setlocale( LC_ALL, "" ) ) {
+    perror( "setlocale" );
+    exit( 1 );
+  }
+
+  /* Verify locale calls for UTF-8 */
+  if ( strcmp( nl_langinfo( CODESET ), "UTF-8" ) != 0 ) {
+    fprintf( stderr, "stm requires a UTF-8 locale.\n" );
+    exit( 1 );
+  }
+
+  /* Verify terminal configuration */
+  if ( tcgetattr( STDIN_FILENO, &saved_termios ) < 0 ) {
+    perror( "tcgetattr" );
+    exit( 1 );
+  }
+
+  /* Put terminal driver in raw mode */
+  raw_termios = saved_termios;
+  if ( !(raw_termios.c_iflag & IUTF8) ) {
+    fprintf( stderr, "Warning: Locale is UTF-8 but termios IUTF8 flag not set. Setting IUTF8 flag.\n" );
+    raw_termios.c_iflag |= IUTF8;
+  }
+
+  cfmakeraw( &raw_termios );
+
+  if ( tcsetattr( STDIN_FILENO, TCSANOW, &raw_termios ) < 0 ) {
+      perror( "tcsetattr" );
+      exit( 1 );
+  }
+
+  /* Put terminal in application-cursor-key mode */
+  swrite( STDOUT_FILENO, Terminal::Emulator::open().c_str() );
+
+  client( ip, port, key );
+
+  /* Restore terminal and terminal-driver state */
+  swrite( STDOUT_FILENO, Terminal::Emulator::close().c_str() );
+
+  if ( tcsetattr( STDIN_FILENO, TCSANOW, &saved_termios ) < 0 ) {
+    perror( "tcsetattr" );
+    exit( 1 );
+  }
+
+  printf( "[stm is exiting.]\n" );
+
+  return 0;
+}
+
+void client( const char *ip, int port, const char *key )
+{
+  /* establish WINCH fd and start listening for signal */
+  sigset_t signal_mask;
+  assert( sigemptyset( &signal_mask ) == 0 );
+  assert( sigaddset( &signal_mask, SIGWINCH ) == 0 );
+
+  /* stop "ignoring" WINCH signal */
+  assert( sigprocmask( SIG_BLOCK, &signal_mask, NULL ) == 0 );
+
+  int winch_fd = signalfd( -1, &signal_mask, 0 );
+  if ( winch_fd < 0 ) {
+    perror( "signalfd" );
+    return;
+  }
+
+  /* get initial window size */
+  struct winsize window_size;
+  if ( ioctl( STDIN_FILENO, TIOCGWINSZ, &window_size ) < 0 ) {
+    perror( "ioctl TIOCGWINSZ" );
+    return;
+  }
+
+  /* XXX transmit initial resize */
+
+  /* local state */
+  Terminal::Complete terminal( window_size.ws_col, window_size.ws_row );
+  Terminal::Framebuffer state( window_size.ws_col, window_size.ws_row );
+
+  /* open network */
+  Network::UserStream blank;
+  Network::Transport< Network::UserStream, Terminal::Complete > network( blank, terminal,
+									 key, ip, port );
+
+  /* prepare to poll for events */
+  struct pollfd pollfds[ 3 ];
+
+  pollfds[ 0 ].fd = network.fd();
+  pollfds[ 0 ].events = POLLIN;
+
+  pollfds[ 1 ].fd = STDIN_FILENO;
+  pollfds[ 1 ].events = POLLIN;
+
+  pollfds[ 2 ].fd = winch_fd;
+  pollfds[ 2 ].events = POLLIN;
+
+  uint64_t last_remote_num = network.get_remote_state_num();
+
+  while ( 1 ) {
+    int active_fds = poll( pollfds, 3, network.tick() );
+    if ( active_fds < 0 ) {
+      perror( "poll" );
+      break;
+    }
+
+    if ( pollfds[ 0 ].revents & POLLIN ) {
+      /* packet received from the network */
+      network.recv();
+
+      /* is a new frame available from the terminal? */
+      if ( network.get_remote_state_num() != last_remote_num ) {
+	string diff = network.get_remote_diff();
+	swrite( STDOUT_FILENO, diff.data(), diff.size() );
+      }
+    }
+    
+    if ( pollfds[ 1 ].revents & POLLIN ) {
+      /* input from the user needs to be fed to the network */
+      const int buf_size = 16384;
+      char buf[ buf_size ];
+
+      /* fill buffer if possible */
+      ssize_t bytes_read = read( pollfds[ 1 ].fd, buf, buf_size );
+      if ( bytes_read == 0 ) { /* EOF */
+	return;
+      } else if ( bytes_read < 0 ) {
+	perror( "read" );
+	return;
+      }
+
+      for ( int i = 0; i < bytes_read; i++ ) {
+	network.get_current_state().push_back( Parser::UserByte( buf[ i ] ) );
+      }
+    }
+
+    if ( pollfds[ 2 ].revents & POLLIN ) {
+      /* handle resize */
+    }
+
+    if ( (pollfds[ 0 ].revents | pollfds[ 1 ].revents)
+	 & (POLLERR | POLLHUP | POLLNVAL) ) {
+      break;
+    }
+  }
+}