www.pudn.com > UIP09_ADSP-BF537_Blackfin_org.zip > telnet.c

/* 
 * Copyright (c) 2002, Adam Dunkels. 
 * All rights reserved.  
 * 
 * Redistribution and use in source and binary forms, with or without  
 * modification, are permitted provided that the following conditions  
 * are met:  
 * 1. Redistributions of source code must retain the above copyright  
 *    notice, this list of conditions and the following disclaimer.  
 * 2. Redistributions in binary form must reproduce the above copyright  
 *    notice, this list of conditions and the following disclaimer in the  
 *    documentation and/or other materials provided with the distribution.  
 * 3. The name of the author may not be used to endorse or promote 
 *    products derived from this software without specific prior 
 *    written permission.   
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.   
 * 
 * This file is part of the uIP TCP/IP stack. 
 * 
 * $Id: telnet.c,v 1.1.2.3 2003/10/06 11:20:45 adam Exp $ 
 * 
 */ 
 
#include "uip.h" 
 
#include "telnet.h" 
 
#ifndef NULL 
#define NULL (void *)0 
#endif /* NULL */ 
 
#define FLAG_CLOSE 1 
#define FLAG_ABORT 2 
/*-----------------------------------------------------------------------------------*/ 
unsigned char 
telnet_send(struct telnet_state *s, char *text, u16_t len) 
{ 
  if(s->text != NULL) { 
    return 1; 
  } 
  s->text = text; 
  s->textlen = len;   
  s->sentlen = 0; 
  return 0; 
} 
/*-----------------------------------------------------------------------------------*/ 
unsigned char 
telnet_close(struct telnet_state *s) 
{ 
  s->flags = FLAG_CLOSE; 
  if(s->text != NULL) { 
    return 1; 
  } 
  return 0; 
} 
/*-----------------------------------------------------------------------------------*/ 
unsigned char 
telnet_abort(struct telnet_state *s) 
{ 
  s->flags = FLAG_ABORT; 
  if(s->text != NULL) { 
    return 1; 
  } 
  return 0; 
} 
/*-----------------------------------------------------------------------------------*/ 
static void 
acked(struct telnet_state *s)     
{ 
  s->textlen -= s->sentlen; 
  if(s->textlen == 0) { 
    s->text = NULL; 
    telnet_sent(s); 
  } else { 
    s->text += s->sentlen; 
  } 
  s->sentlen = 0; 
} 
/*-----------------------------------------------------------------------------------*/ 
static void 
senddata(struct telnet_state *s)     
{ 
  if(s->text == NULL) { 
    uip_send(s->text, 0); 
    return; 
  } 
  if(s->textlen > uip_mss()) { 
    s->sentlen = uip_mss(); 
  } else { 
    s->sentlen = s->textlen; 
  } 
  uip_send(s->text, s->sentlen); 
} 
/*-----------------------------------------------------------------------------------*/ 
void telnet_app(void) 
{ 
  struct telnet_state *s = (struct telnet_state *)uip_conn->appstate; 
     
  if(uip_connected()) { 
    s->flags = 0; 
    telnet_connected(s); 
    senddata(s); 
    return; 
  } 
   
  if(uip_closed()) { 
    telnet_closed(s); 
  } 
   
  if(uip_aborted()) { 
    telnet_aborted(s); 
  } 
  if(uip_timedout()) { 
    telnet_timedout(s); 
  } 
 
 
  if(s->flags & FLAG_CLOSE) { 
    uip_close(); 
    return; 
  } 
  if(s->flags & FLAG_ABORT) { 
    uip_abort(); 
    return; 
  } 
  if(uip_acked()) { 
    acked(s); 
  } 
  if(uip_newdata()) { 
    telnet_newdata(s, (char *)uip_appdata, uip_datalen()); 
  } 
  if(uip_rexmit() || 
     uip_newdata() || 
     uip_acked()) { 
    senddata(s); 
  } else if(uip_poll()) {     
    senddata(s); 
  } 
} 
/*-----------------------------------------------------------------------------------*/