echo.c

REBIT单片机网络编程例程,跟培训教程.

/**********************************************************************
 *		Samples/TCPIP/echo.c
 *		Copyright (c) 2001, Z-World (jjb)
 *		This program demonstrates the tcp_listen call.
 *
 * 	A basic server, that when a client connect, echoes back to them
 * 	any data that they send.
 *
 **********************************************************************/
#class auto


/***********************************
 * Configuration                   *
 * -------------                   *
 * All fields in this section must *
 * be altered to match your local  *
 * network settings.               *
 ***********************************/

/*
 * Pick the predefined TCP/IP configuration for this sample.  See
 * LIB\TCPIP\TCP_CONFIG.LIB for instructions on how to set the
 * configuration.
 */
#define TCPCONFIG 1

#use "dcrtcp.lib"

/**
 *  Port Number    Purpose
 *  -----------    -------
 *      13         Daytime
 *      23         Telnet
 * 					Note: this program doesn't handle telnet option negotiation.
 *      80         HTTP
 */
#define PORT 23


/********************************
 * End of configuration section *
 ********************************/

///////////////////////////////////////////////////////////////////////

void main()
{
	int bytes_read;
	char	buffer[100]; 	/* Currently (DC 7.30), printf() has max 127 bytes it can output. */
	tcp_Socket socket;
	
	sock_init();
	
	while(1) {
		tcp_listen(&socket,PORT,0,0,NULL,0);

		printf("Waiting for connection...\n");
		while(!sock_established(&socket) && sock_bytesready(&socket)==-1)
			tcp_tick(NULL);

		printf("Connection received...\n");

		do {
			bytes_read=sock_fastread(&socket,buffer,sizeof(buffer)-1);

			if(bytes_read>0) {
				buffer[bytes_read]=0;
				printf("%s",buffer);
				sock_write(&socket,buffer,bytes_read);
			}
		} while(tcp_tick(&socket));

		printf("Connection closed...\n");
	}
}