1 // sg_socket.cxx -- Socket I/O routines
3 // Written by Curtis Olson, started November 1999.
5 // Copyright (C) 1999 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <simgear/compiler.h>
30 #include <simgear/debug/logstream.hxx>
32 #include "sg_socket_udp.hxx"
35 SGSocketUDP::SGSocketUDP( const string& host, const string& port ) :
44 SGSocketUDP::~SGSocketUDP() {
48 // If specified as a server (in direction for now) open the master
49 // listening socket. If specified as a client (out direction), open a
50 // connection to a server.
51 bool SGSocketUDP::open( const SGProtocolDir d ) {
54 if ( ! sock.open( false ) ) { // open a UDP socket
55 SG_LOG( SG_IO, SG_ALERT, "error opening socket" );
59 if ( port_str == "" || port_str == "any" ) {
62 port = atoi( port_str.c_str() );
65 // client_connections.clear();
67 if ( get_dir() == SG_IO_IN ) {
71 if ( sock.bind( hostname.c_str(), port ) == -1 ) {
72 SG_LOG( SG_IO, SG_ALERT, "error binding to port" << port_str );
75 } else if ( get_dir() == SG_IO_OUT ) {
79 if ( sock.connect( hostname.c_str(), port ) == -1 ) {
80 SG_LOG( SG_IO, SG_ALERT,
81 "error connecting to " << hostname << port_str );
85 SG_LOG( SG_IO, SG_ALERT,
86 "Error: bidirection mode not available for UDP sockets." );
96 // read data from socket (server)
97 // read a block of data of specified size
98 int SGSocketUDP::read( char *buf, int length ) {
105 if ( (result = sock.recv(buf, SG_IO_MAX_MSG_SIZE, 0)) >= 0 ) {
107 // printf("msg received = %s\n", buf);
114 // read a line of data, length is max size of input buffer
115 int SGSocketUDP::readline( char *buf, int length ) {
120 // cout << "sock = " << sock << endl;
122 char *buf_ptr = save_buf + save_len;
123 int result = sock.recv(buf_ptr, SG_IO_MAX_MSG_SIZE, 0);
124 // printf("msg received = %s\n", buf);
127 // look for the end of line in save_buf
129 for ( i = 0; i < save_len && save_buf[i] != '\n'; ++i );
130 if ( save_buf[i] == '\n' ) {
133 // no end of line yet
134 // cout << "no eol found" << endl;
137 // cout << "line length = " << result << endl;
139 // we found an end of line
141 // copy to external buffer
142 strncpy( buf, save_buf, result );
144 // cout << "sg_socket line = " << buf << endl;
147 for ( i = result; i < save_len; ++i ) {
148 save_buf[ i - result ] = save_buf[i];
156 // write data to socket (client)
157 int SGSocketUDP::write( const char *buf, const int length ) {
162 bool error_condition = false;
164 if ( sock.send( buf, length, 0 ) < 0 ) {
165 SG_LOG( SG_IO, SG_WARN, "Error writing to socket: " << port );
166 error_condition = true;
174 // write null terminated string to socket (server)
175 int SGSocketUDP::writestring( const char *str ) {
180 int length = strlen( str );
181 return write( str, length );
186 bool SGSocketUDP::close() {
197 // configure the socket as non-blocking
198 bool SGSocketUDP::setBlocking( bool value ) {
199 sock.setBlocking( value );