+#ifdef CONFIG_API
+static void eth_save_packet(volatile void *packet, int length)
+{
+ volatile char *p = packet;
+ int i;
+
+ if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
+ return;
+
+ if (PKTSIZE < length)
+ return;
+
+ for (i = 0; i < length; i++)
+ eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
+
+ eth_rcv_bufs[eth_rcv_last].length = length;
+ eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
+}
+
+int eth_receive(volatile void *packet, int length)
+{
+ volatile char *p = packet;
+ void *pp = push_packet;
+ int i;
+
+ if (eth_rcv_current == eth_rcv_last) {
+ push_packet = eth_save_packet;
+ eth_rx();
+ push_packet = pp;
+
+ if (eth_rcv_current == eth_rcv_last)
+ return -1;
+ }
+
+ if (length < eth_rcv_bufs[eth_rcv_current].length)
+ return -1;
+
+ length = eth_rcv_bufs[eth_rcv_current].length;
+
+ for (i = 0; i < length; i++)
+ p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
+
+ eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
+ return length;
+}
+#endif /* CONFIG_API */
+