Some fixes thanks to Bart Mertens (nethogs Debian maintainer)

Changelog

@@ -6,6 +6,7 @@ Changelog
   strings 'const'
 - set view mode to 'kbps' by default,
   instead of the 'grand total' number of bytes
+- some fixes thanks to Bart Martens
 
 27/08/05 (Arnout)
 - giving all unknown connections their own

cui.cpp

@@ -2,6 +2,7 @@
 #include <string>
 #include <pwd.h>
 #include <sys/types.h>
+#include <algorithm>
 
 #include <ncurses.h>
 #include "nethogs.h"

nethogs.cpp

@@ -338,12 +338,13 @@ int main (int argc, char** argv)
 		}
 
 		dp_handle * newhandle = dp_open_live(current_dev->name, BUFSIZ, promisc, 100, errbuf); 
-		dp_addcb (newhandle, dp_packet_ip, process_ip);
-		dp_addcb (newhandle, dp_packet_ip6, process_ip6);
-		dp_addcb (newhandle, dp_packet_tcp, process_tcp);
-		dp_addcb (newhandle, dp_packet_udp, process_udp);
 		if (newhandle != NULL)
 		{
+			dp_addcb (newhandle, dp_packet_ip, process_ip);
+			dp_addcb (newhandle, dp_packet_ip6, process_ip6);
+			dp_addcb (newhandle, dp_packet_tcp, process_tcp);
+			dp_addcb (newhandle, dp_packet_udp, process_udp);
+
 			/* The following code solves sf.net bug 1019381, but is only available
 			 * in newer versions (from 0.8 it seems) of libpcap 
 			 *
@@ -356,6 +357,10 @@ int main (int argc, char** argv)
 			}
 			handles = new handle (newhandle, current_dev->name, handles);
 		}
+		else
+		{
+			fprintf(stderr, "Error opening handler for device %s\n", current_dev->name);
+		}
 
 		current_dev = current_dev->next;
 	}