diff --git a/src/api/api_lib.c b/src/api/api_lib.c
index da2def30..5bd3d79b 100644
--- a/src/api/api_lib.c
+++ b/src/api/api_lib.c
@@ -490,7 +490,7 @@ netconn_recv(struct netconn *conn)
   
 
     
-  DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", buf, conn->err));
+  DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", (void *)buf, conn->err));
 
 
   return buf;
diff --git a/src/api/tcpip.c b/src/api/tcpip.c
index bc3fd2cf..9b8babd3 100644
--- a/src/api/tcpip.c
+++ b/src/api/tcpip.c
@@ -77,11 +77,11 @@ tcpip_thread(void *arg)
     sys_mbox_fetch(mbox, (void *)&msg);
     switch(msg->type) {
     case TCPIP_MSG_API:
-      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", msg));
+      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
       api_msg_input(msg->msg.apimsg);
       break;
     case TCPIP_MSG_INPUT:
-      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: IP packet %p\n", msg));
+      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: IP packet %p\n", (void *)msg));
       ip_input(msg->msg.inp.p, msg->msg.inp.netif);
       break;
     default:
diff --git a/src/core/pbuf.c b/src/core/pbuf.c
index 28b955e4..1b18f80d 100644
--- a/src/core/pbuf.c
+++ b/src/core/pbuf.c
@@ -615,7 +615,7 @@ struct pbuf *
 pbuf_unref(struct pbuf *f)
 {
   struct pbuf *p, *q;
-  DEBUGF(PBUF_DEBUG, ("pbuf_unref: %p \n", f));
+  DEBUGF(PBUF_DEBUG, ("pbuf_unref: %p \n", (void*)f));
   /* first pbuf is of type PBUF_REF? */
   if (f->flags == PBUF_FLAG_REF)
   {
@@ -641,7 +641,7 @@ pbuf_unref(struct pbuf *f)
       /* de-allocate PBUF_REF */
       pbuf_free(f);
       f = p;
-      DEBUGF(PBUF_DEBUG, ("pbuf_unref: succesful %p \n", f));
+      DEBUGF(PBUF_DEBUG, ("pbuf_unref: succesful %p \n", (void *)f));
     }
     else
     {
diff --git a/src/core/tcp.c b/src/core/tcp.c
index 508de3c9..295c70f0 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -314,7 +314,7 @@ tcp_listen(struct tcp_pcb *pcb)
 #endif /* LWIP_CALLBACK_API */
 /* workaround for compile error: assignment requires modifiable lvalue in TCP_REG */ 
 #if LWIP_TCP_REG_COMPILE_ERROR
-  // place this pcb at the start the "listening pcbs" list
+  /* place this pcb at the start the "listening pcbs" list */
   lpcb->next = tcp_listen_pcbs;
   tcp_listen_pcbs = lpcb;
 #else
@@ -753,7 +753,7 @@ tcp_kill_prio(u8_t prio)
   }
   if(inactive != NULL) {
     DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB 0x%p (%ld)\n",
-		       inactive, inactivity));
+		       (void *)inactive, inactivity));
     tcp_abort(inactive);
   }      
 }
@@ -775,7 +775,7 @@ tcp_kill_timewait(void)
   }
   if(inactive != NULL) {
     DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB 0x%p (%ld)\n",
-		       inactive, inactivity));
+		       (void *)inactive, inactivity));
     tcp_abort(inactive);
   }      
 }
@@ -966,7 +966,7 @@ tcp_pcb_purge(struct tcp_pcb *pcb)
     if(pcb->unacked != NULL) {    
       DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
     }
-#if TCP_QUEUE_OOSEQ // LW
+#if TCP_QUEUE_OOSEQ /* LW */
     if(pcb->ooseq != NULL) {    
       DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
     }
diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 14bfa3ba..35bec0d2 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -212,9 +212,9 @@ tcp_input(struct pbuf *p, struct netif *inp)
 	   arrivals). */
 	if(prev != NULL) {
 	  ((struct tcp_pcb_listen *)prev)->next = lpcb->next;
-          // our successor is the remainder of the listening list
+          /* our successor is the remainder of the listening list */
 	  lpcb->next = tcp_listen_pcbs;
-          // put this listening pcb at the head of the listening list
+          /* put this listening pcb at the head of the listening list */
 	  tcp_listen_pcbs = lpcb; 
 	}
 
diff --git a/src/netif/etharp.c b/src/netif/etharp.c
index 65b7c0fb..b4443e08 100644
--- a/src/netif/etharp.c
+++ b/src/netif/etharp.c
@@ -3,6 +3,10 @@
  * Address Resolution Protocol module for IP over Ethernet
  *
  * $Log: etharp.c,v $
+ * Revision 1.16  2002/12/17 09:41:16  jani
+ * Use C style comments.In debug stataments cast various struct pointers to void* to
+ * avoid printf warnings.misc warnings in etharp.
+ *
  * Revision 1.15  2002/12/05 09:41:52  kieranm
  * Fixed compiler warnings when ARP_QUEUEING is not defined.
  *
@@ -14,21 +18,6 @@
  *
  * Revision 1.12  2002/11/28 09:26:18  likewise
  * All ARP queueing code is now conditionally compiled-in.
- *
- * Revision 1.11  2002/11/18 10:31:05  likewise
- * Conditionally have ARP queue outgoing pbufs.
- *
- * Revision 1.10  2002/11/18 08:41:31  jani
- * Move etharp packed structures to the header file.
- *
- * Revision 1.9  2002/11/15 12:41:59  likewise
- * ETHARP_SNOOP_UPDATES made externally configurable.
- *
- * Revision 1.8  2002/11/13 09:10:19  likewise
- * ARP entries can now be updated (but not added) on any ARP traffic. Set #define ETHARP_SNOOP_UPDATES 1 to enable.
- *
- * Revision 1.7  2002/11/13 08:56:11  likewise
- * Implemented conditional insertion of ARP entries to update_arp_entry using ARP_INSERT_FLAG.
  */
 
 /*
@@ -155,7 +144,7 @@ struct etharp_entry {
 };
 
 static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
-static struct etharp_entry arp_table[ARP_TABLE_SIZE] = { 0 } ;
+static struct etharp_entry arp_table[ARP_TABLE_SIZE];
 static u8_t ctime;
 
 static struct pbuf *update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags);
@@ -207,7 +196,7 @@ etharp_tmr(void)
 	      (ctime - arp_table[i].ctime >= ARP_MAXPENDING)) {
       arp_table[i].state = ETHARP_STATE_EMPTY;
 #if ARP_QUEUEING
-      DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired pending entry %u - dequeueing %p.\n", i, arp_table[i].p));
+      DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired pending entry %u - dequeueing %p.\n", i, (void *)(arp_table[i].p)));
       /* remove any queued packet */
       pbuf_free(arp_table[i].p);      
       arp_table[i].p = NULL;
@@ -281,7 +270,7 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
 #endif
   DEBUGF(ETHARP_DEBUG, ("update_arp_entry()"));
   DEBUGF(ETHARP_DEBUG, ("update_arp_entry: %u.%u.%u.%u - %02x:%02x:%02x:%02x:%02x:%02x\n", ip4_addr1(ipaddr), ip4_addr2(ipaddr), ip4_addr3(ipaddr), ip4_addr4(ipaddr),
-  ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2], ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5], ethaddr->addr[6]));
+  ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2], ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
   /* do not update for 0.0.0.0 addresses */
   if (ipaddr->addr == 0) {
     DEBUGF(ETHARP_DEBUG, ("update_arp_entry: will not add 0.0.0.0 to ARP cache\n"));
@@ -311,7 +300,7 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
         /* time stamp */
         arp_table[i].ctime = ctime;
 #if ARP_QUEUEING
-        // queued packet present? */
+        /* queued packet present? */
         if(arp_table[i].p != NULL) {	
 
           /* fill-in Ethernet header */
@@ -374,7 +363,7 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
   }
   else
   {
-    DEBUGF(ETHARP_DEBUG, ("update_arp_entry: no matching stable entry to update\n", i));
+    DEBUGF(ETHARP_DEBUG, ("update_arp_entry: no matching stable entry to update\n"));
   }
   return NULL;
 }
@@ -649,7 +638,7 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
     /* return the outgoing packet */
     return q;
   }
-  // never reached; here for safety 
+  /* never reached; here for safety */ 
   return NULL;
 }