ssize_t
NetStream::read_from_net(
void *buf,
size_t nbytes
) const
{
char *tmpbuf = (char*) buf;
int numread = 0;
double stime = 0;
while (nbytes) {
#ifdef WIN32
int readb = read_win32(_fd, tmpbuf, nbytes);
#else
int readb = ::read(_fd, tmpbuf, nbytes);
#endif
if (errno == EAGAIN) { // if nothing's left to read, then
if (Config::get_var_bool("PRINT_ERRS",false,true))
cerr << " bytes read from network (EAGAIN) = " << numread << endl;
return numread + (readb == -1 ? 0:readb); //just return what we have
}
if (readb < 0) {
perror("NetStream::read_from_net : Warning - ");
return -1;
}
if (readb == 0 && nbytes > 0)
{
#ifdef WIN32
//XXX - errno not set on WIN32 when there's not enough
//to read on a non-blocking fd... should prolly
//set some state in read_win32 to reflect this, but
//for now just assume this is the reason and
//return without error...
return numread + (readb == -1 ? 0:readb);
#else
if (stime == 0)
stime = the_time();
if (the_time() - stime > 1 || errno != EAGAIN) {
if (port_ > 0) {
// Only print out a message if reading from the net
cerr << "NetStream::read_from_net - read error: peer reset"
<< endl;
}
return -1;
}
#endif
}
nbytes -= readb;
tmpbuf += readb;
numread+= readb;
}
if (Config::get_var_bool("PRINT_ERRS",false,true))
cerr << " bytes read from network = " << numread << endl;
return numread;
}
static void
vehicle_wince_io(struct vehicle_priv *priv)
{
int size, rc = 0;
char *str, *tok;
dbg(1, "vehicle_file_io : enter\n");
size = read_win32(priv, priv->buffer + priv->buffer_pos, buffer_size - priv->buffer_pos - 1);
if (size <= 0) {
switch (priv->on_eof) {
case 0:
vehicle_wince_close(priv);
vehicle_wince_open(priv);
break;
case 1:
vehicle_wince_disable_watch(priv);
break;
case 2:
exit(0);
break;
}
return;
}
priv->buffer_pos += size;
priv->buffer[priv->buffer_pos] = '\0';
dbg(1, "size=%d pos=%d buffer='%s'\n", size,
priv->buffer_pos, priv->buffer);
str = priv->buffer;
while ((tok = strchr(str, '\n'))) {
*tok++ = '\0';
dbg(1, "line='%s'\n", str);
rc +=vehicle_wince_parse(priv, str);
str = tok;
if (priv->file_type == file_type_file && rc)
break;
}
if (str != priv->buffer) {
size = priv->buffer + priv->buffer_pos - str;
memmove(priv->buffer, str, size + 1);
priv->buffer_pos = size;
dbg(2, "now pos=%d buffer='%s'\n",
priv->buffer_pos, priv->buffer);
} else if (priv->buffer_pos == buffer_size - 1) {
dbg(0,
"Overflow. Most likely wrong baud rate or no nmea protocol\n");
priv->buffer_pos = 0;
}
if (rc)
callback_list_call_attr_0(priv->cbl, attr_position_coord_geo);
}