Hide informative output of flush routes/arp behind a verbose flag

Suggested by Tom

commands.c

@@ -1046,9 +1046,17 @@ sysctlhelp(int unused1, char **unused2, ...)
  * Data structures and routines for the "flush" command.
  */
 
+struct ghs flushtab[] = {
+	{ "<cr>", "Type Enter to run command", CMPL0 NULL, 0 },
+	{ "verbose", "Show verbose diagnostics", CMPL0 NULL, 0 },
+	{ NULL, NULL, NULL, NULL, 0 }
+};
+
 Menu flushlist[] = {
-	{ "routes",	"IP routes", CMPL0 0, 0, 0, 0, flush_ip_routes },
-	{ "arp",	"ARP cache", CMPL0 0, 0, 0, 0, flush_arp_cache },
+	{ "routes",	"IP routes", CMPL(h) (char **)flushtab,
+	    sizeof(struct ghs), 0, 1, flush_ip_routes },
+	{ "arp",	"ARP cache", CMPL(h) (char **)flushtab,
+	    sizeof(struct ghs), 0, 1, flush_arp_cache },
 	{ "ndp",	"NDP cache", CMPL0 0, 0, 0, 0, flush_ndp_cache },
 	{ "line",	"Active user", CMPL0 0, 0, 1, 1, flush_line },
 	{ "bridge-dyn",	"Dynamically learned bridge addresses", CMPL0 0, 0, 1, 1, flush_bridgedyn },
@@ -3457,15 +3465,29 @@ powerdown(int argc, char **argv, ...)
 static int
 flush_ip_routes(int argc, char **argv, ...)
 {
-	flushroutes(AF_INET, AF_INET);
+	va_list ap;
+	char *verbose_arg;
+
+	va_start(ap, argv);
+	verbose_arg = va_arg(ap, char *);
+	va_end(ap);
+
+	flushroutes(AF_INET, AF_INET, verbose_arg != NULL);
 
 	return(0);
 }
 
 static int
 flush_arp_cache(int argc, char **argv, ...)
 {
-	flushroutes(AF_INET, AF_LINK);
+	va_list ap;
+	char *verbose_arg;
+
+	va_start(ap, argv);
+	verbose_arg = va_arg(ap, char *);
+	va_end(ap);
+
+	flushroutes(AF_INET, AF_INET, verbose_arg != NULL);
 
 	return(0);
 }

externs.h

@@ -146,7 +146,7 @@ struct rtdump *getrtdump(int, int, int);
 void freertdump(struct rtdump *);
 int monitor(int, char **, ...);
 int rtmsg(int, int, int, int, int);
-void flushroutes(int, int);
+void flushroutes(int, int, int);
 void bprintf(FILE *, int, u_char *);
 #ifdef _NET_IF_DL_H_
 char *mylink_ntoa(const struct sockaddr_dl *);

kroute.c

@@ -69,7 +69,6 @@ u_long	rtm_inits;
 
 char	*mylink_ntoa(const struct sockaddr_dl *);
 
-void	 flushroutes(int, int);
 void	 print_rtmsg(struct rt_msghdr *);
 void	 print_getmsg(struct rt_msghdr *, int);
 void	 pmsg_common(struct rt_msghdr *);
@@ -147,7 +146,7 @@ freertdump(struct rtdump *rtdump)
  * sockaddrs match requested address families
  */
 void
-flushroutes(int af, int af2)
+flushroutes(int af, int af2, int flush_verbose)
 {
 	int rlen, seqno, s;
 	char *next;
@@ -203,12 +202,13 @@ flushroutes(int af, int af2)
 		rlen = write(s, next, rtm->rtm_msglen);
 		if (rlen < (int)rtm->rtm_msglen) {
 			if (errno == ESRCH) {
-				printf("%% No such route to delete:");
-				print_addrs((char *)rtm + rtm->rtm_hdrlen,
-				   rtm->rtm_addrs);
-				putchar('\n');
-				fflush(stdout);
-
+				if (flush_verbose) {
+					printf("%% No such route to delete:");
+					print_addrs((char *)rtm +
+					    rtm->rtm_hdrlen, rtm->rtm_addrs);
+					putchar('\n');
+					fflush(stdout);
+				}
 				seqno++;
 				continue;
 			}
@@ -220,7 +220,7 @@ flushroutes(int af, int af2)
 		if (verbose) {
 			printf("\n%% Wrote message:\n");
 			print_rtmsg(rtm);
-		} else {
+		} else if (flush_verbose) {
 			printf("%% %-20.20s ", routename(sa));
 			printf("%-20.20s flushed\n", routename(sa2));
 		}
@@ -229,6 +229,9 @@ flushroutes(int af, int af2)
 		printf("\n");
 	if (!seqno)
 		printf("%% No entires found to flush\n");
+	else
+		printf("%% %d routing table entr%s flushed\n", seqno,
+		    seqno == 1 ? "y" : "ies");
 	freertdump(rtdump);
 	close(s);
 	return;

nsh.8

@@ -3695,14 +3695,20 @@ nsh(p)/flush ?
 .Ed
 .Pp
 .Tg route
-.Ic flush routes
+.Ic flush routes Oo Ic verbose Oc
 .Pp
 Clear the system routing table.
+If the
+.Ic verbose
+flag is used then show which routes were deleted.
 .Pp
 .Tg arp
-.Ic flush arp
+.Ic flush arp Oo Ic verbose Oc
 .Pp
 Clear the system arp cache and static arp table.
+If the
+.Ic verbose
+flag is used then show which ARP entries were deleted.
 .Pp
 .Tg ndp
 .Ic flush ndp