int
getchar(void)
{
unsigned char c = '\0';
int i;
for (;;) {
i = apbus ? apcall_read(1, &c, 1) : rom_read(1, &c, 1);
if (i == 1)
break;
if (i != -2 && i != 0)
return -1;
}
return c;
}
/*
* Receive a packet, including the ether header.
* Return the total length received (or -1 on error).
*/
ssize_t
netif_get(struct iodesc *desc, void *pkt, size_t maxlen, time_t timo)
{
struct romdev *pd;
int tick0;
ssize_t len;
pd = (struct romdev *)desc->io_netif;
#ifdef NETIF_DEBUG
if (netif_debug)
printf("netif_get: pkt=0x%x, maxlen=%d, tmo=%d\n",
pkt, maxlen, timo);
#endif
tick0 = getsecs();
do {
len = apcall_read(pd->fd, pkt, maxlen);
} while ((len == 0) && ((getsecs() - tick0) < timo));
#ifdef NETIF_DEBUG
if (netif_debug)
printf("netif_get: received len=%d\n", len);
#endif
if (len < 12)
return -1;
#ifdef NETIF_DEBUG
if (netif_debug) {
struct ether_header *eh = pkt;
printf("dst: %s ", ether_sprintf(eh->ether_dhost));
printf("src: %s ", ether_sprintf(eh->ether_shost));
printf("type: 0x%x\n", eh->ether_type & 0xFFFF);
}
#endif
return len;
}
