lwip-contrib-mac/ports/rtxc/netif/sioslipif.c
2003-01-18 18:33:29 +00:00

171 lines
4.6 KiB
C

/*
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
* 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 lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "lwip/debug.h"
#include "lwip/def.h"
#include "netif/sioslipif.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
/* This variable is used for passing the netif pointer between the
threads. */
static struct netif *netif_pass;
static int infd, outfd;
/*-----------------------------------------------------------------------------------*/
static void
sio_send(u8_t c)
{
write(outfd, &c, 1);
}
/*-----------------------------------------------------------------------------------*/
static u8_t
sio_recv(void)
{
u8_t c;
read(infd, &c, 1);
return c;
}
/*-----------------------------------------------------------------------------------*/
static int
sioslipif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr)
{
struct pbuf *q;
int i;
u8_t c;
/* Send pbuf out on the serial I/O device. */
sio_send(SLIP_END);
for(q = p; q != NULL; q = q->next) {
for(i = 0; i < q->len; i++) {
c = ((u8_t *)q->payload)[i];
switch(c) {
case SLIP_END:
sio_send(SLIP_ESC);
sio_send(SLIP_ESC_END);
break;
case SLIP_ESC:
sio_send(SLIP_ESC);
sio_send(SLIP_ESC_ESC);
break;
default:
sio_send(c);
break;
}
}
}
sio_send(SLIP_END);
return 0;
}
/*-----------------------------------------------------------------------------------*/
static struct pbuf *
sioslipif_input(void)
{
u8_t c;
struct pbuf *p, *q;
int recved;
int i;
p = pbuf_alloc(PBUF_LINK, PBUF_MAX_SIZE, PBUF_POOL);
q = p;
recved = i = 0;
while(1) {
c = sio_recv();
switch(c) {
case SLIP_END:
if(recved > 0) {
/* Received whole packet. */
pbuf_realloc(p, recved);
return p;
}
break;
case SLIP_ESC:
c = sio_recv();
switch(c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
/* FALLTHROUGH */
default:
if(recved < p->tot_len && q != NULL) {
((u8_t *)q->payload)[i] = c;
recved++;
i++;
if(i >= q->len) {
i = 0;
q = q->next;
}
}
break;
}
}
}
/*-----------------------------------------------------------------------------------*/
static void
sioslipif_loop(void)
{
struct pbuf *p;
struct netif *netif;
netif = netif_pass;
while(1) {
p = sioslipif_input();
netif->input(p, netif);
}
}
/*-----------------------------------------------------------------------------------*/
void
sioslipif_init(struct netif *netif)
{
netif->state = NULL;
netif->name[0] = 's';
netif->name[1] = 'l';
netif->output = sioslipif_output;
netif_pass = netif;
sys_thread_new((void *)sioslipif_loop, NULL);
/* Do some magic to make it possible to receive data from the serial I/O device. */
}
/*-----------------------------------------------------------------------------------*/