Correct format string specifiers

The formats has been tested and verified on Mac OS X 10.8.5,
Mac OS X 10.11.5 and Ubuntu 14.04 LTS, all on x86_64 machines
and OSs. It mainly silences warnings. There were no warnings on
Ubuntu but a few on Mac OS, so the fix is intended to silence
warnings on Mac OS whithout triggering new warnings on other OSs.
Example of warnings previously encountered:

netutil.cc:2828:74: warning: format specifies type 'unsigned short'
but the argument has type 'int' [-Wformat]

libnetutil/netutil.cc

@@ -2825,7 +2825,7 @@ const char *ippackethdrinfo(const u8 *packet, u32 len, int detail) {
 
           case 4:
             strcpy(icmptype, "Fragmentation required");
-            Snprintf(icmpfields, sizeof(icmpfields), "Next-Hop-MTU=%hu", icmppkt->data[2]<<8 | icmppkt->data[3]);
+            Snprintf(icmpfields, sizeof(icmpfields), "Next-Hop-MTU=%d", icmppkt->data[2]<<8 | icmppkt->data[3]);
             break;
 
           case 5:

ncat/ncat_connect.c

@@ -258,7 +258,7 @@ static void connect_report(nsock_iod nsi)
             char digest_buf[SHA1_STRING_LENGTH + 1];
             char *fp;
 
-            loguser("SSL connection to %s:%hu.", inet_socktop(&peer),
+            loguser("SSL connection to %s:%d.", inet_socktop(&peer),
                     nsock_iod_get_peerport(nsi));
 
             cert = SSL_get_peer_certificate((SSL *)nsock_iod_get_ssl(nsi));
@@ -285,7 +285,7 @@ static void connect_report(nsock_iod nsi)
                 loguser("Connected to %s.\n", peer.un.sun_path);
             else
 #endif
-                loguser("Connected to %s:%hu.\n", inet_socktop(&peer),
+                loguser("Connected to %s:%d.\n", inet_socktop(&peer),
                         nsock_iod_get_peerport(nsi));
         }
 #else
@@ -294,7 +294,7 @@ static void connect_report(nsock_iod nsi)
             loguser("Connected to %s.\n", peer.un.sun_path);
         else
 #endif
-            loguser("Connected to %s:%hu.\n", inet_socktop(&peer),
+            loguser("Connected to %s:%d.\n", inet_socktop(&peer),
                     nsock_iod_get_peerport(nsi));
 #endif
     }

ncat/ncat_proxy.c

@@ -492,7 +492,7 @@ static int handle_connect(struct socket_buffer *client_sock,
         return 400;
     }
     if (o.debug > 1)
-        logdebug("CONNECT to %s:%hu.\n", request->uri.host, request->uri.port);
+        logdebug("CONNECT to %s:%d.\n", request->uri.host, request->uri.port);
 
     rc = resolve(request->uri.host, request->uri.port, &su.storage, &sslen, o.af);
     if (rc != 0) {
@@ -680,7 +680,7 @@ static int do_transaction(struct http_request *request,
     if (request->uri.port == -1 || request->uri.port == 80)
         n = Snprintf(buf, sizeof(buf), "%s", request->uri.host);
     else
-        n = Snprintf(buf, sizeof(buf), "%s:%hu", request->uri.host, request->uri.port);
+        n = Snprintf(buf, sizeof(buf), "%s:%d", request->uri.host, request->uri.port);
     if (n < 0 || n >= sizeof(buf)) {
         /* Request Entity Too Large. */
         return 501;

osscan2.cc

@@ -3420,7 +3420,7 @@ bool HostOsScan::get_tcpopt_string(struct tcp_hdr *tcp, int mss, char *result, i
         break; /* Window Scale option has 3 bytes */
       *p++ = 'W';
       q++;
-      snprintf(p, length, "%hX", *((u8*)q));
+      snprintf(p, length, "%hhX", *((u8*)q));
       p += strlen(p); /* max movement of p is 2 (max WScale value is 0xFF) */
       q++;
       length -= 3;

output.cc

@@ -1879,23 +1879,23 @@ void printosscanoutput(Target *currenths) {
     xml_open_start_tag("portused");
     xml_attribute("state", "open");
     xml_attribute("proto", "tcp");
-    xml_attribute("portid", "%hu", FPR->osscan_opentcpport);
+    xml_attribute("portid", "%d", FPR->osscan_opentcpport);
     xml_close_empty_tag();
     xml_newline();
   }
   if (FPR->osscan_closedtcpport > 0) {
     xml_open_start_tag("portused");
     xml_attribute("state", "closed");
     xml_attribute("proto", "tcp");
-    xml_attribute("portid", "%hu", FPR->osscan_closedtcpport);
+    xml_attribute("portid", "%d", FPR->osscan_closedtcpport);
     xml_close_empty_tag();
     xml_newline();
   }
   if (FPR->osscan_closedudpport > 0) {
     xml_open_start_tag("portused");
     xml_attribute("state", "closed");
     xml_attribute("proto", "udp");
-    xml_attribute("portid", "%hu", FPR->osscan_closedudpport);
+    xml_attribute("portid", "%d", FPR->osscan_closedudpport);
     xml_close_empty_tag();
     xml_newline();
   }

tcpip.cc

@@ -1269,7 +1269,7 @@ int readtcppacket(const u8 *packet, int readdata) {
         log_write(LOG_PLAIN, "URG ");
       log_write(LOG_PLAIN, "\n");
 
-      log_write(LOG_PLAIN, "ipid: %hu ttl: %hu ", ntohs(ip->ip_id),
+      log_write(LOG_PLAIN, "ipid: %hu ttl: %hhu ", ntohs(ip->ip_id),
                 ip->ip_ttl);
 
       if (tcp->th_flags & (TH_SYN | TH_ACK))
@@ -1329,7 +1329,7 @@ int readudppacket(const u8 *packet, int readdata) {
                 sourcehost, ntohs(udp->uh_sport), inet_ntoa(bullshit2),
                 ntohs(udp->uh_dport), tot_len);
 
-      log_write(LOG_PLAIN, "ttl: %hu ", ip->ip_ttl);
+      log_write(LOG_PLAIN, "ttl: %hhu ", ip->ip_ttl);
     }
   }
   if (readdata && i < tot_len) {