[PATCH iproute2] ip: speedup store_nlmsg()

@@ -570,13 +570,16 @@ static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo, FILE *
 	return 0;
 }
 
+struct nlmsg_list_info {
+	struct nlmsg_list *first;
+	struct nlmsg_list *last;
+}; 
 
 static int store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n,
 		       void *arg)
 {
-	struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
+	struct nlmsg_list_info *linfo = (struct nlmsg_list_info *)arg;
 	struct nlmsg_list *h;
-	struct nlmsg_list **lp;
 
 	h = malloc(n->nlmsg_len+sizeof(void*));
 	if (h == NULL)

@@ -585,8 +588,11 @@ static int store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n,
 	memcpy(&h->h, n, n->nlmsg_len);
 	h->next = NULL;
 
-	for (lp = linfo; *lp; lp = &(*lp)->next) /* NOTHING */;
-	*lp = h;
+	if (linfo->first)
+		linfo->last->next = h;
+	else
+		linfo->first = h;
+	linfo->last = h;
 
 	ll_remember_index(who, n, NULL);
 	return 0;

@@ -594,8 +600,8 @@ static int store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n,
 
 static int ipaddr_list_or_flush(int argc, char **argv, int flush)
 {
-	struct nlmsg_list *linfo = NULL;
-	struct nlmsg_list *ainfo = NULL;
+	struct nlmsg_list_info linfo = {0};
+	struct nlmsg_list_info ainfo = {0};
 	struct nlmsg_list *l, *n;
 	char *filter_dev = NULL;
 	int no_link = 0;

@@ -750,7 +756,7 @@ static int ipaddr_list_or_flush(int argc, char **argv, int flush)
 
 	if (filter.family && filter.family != AF_PACKET) {
 		struct nlmsg_list **lp;
-		lp=&linfo;
+		lp = &linfo.first;
 
 		if (filter.oneline)
 			no_link = 1;

@@ -760,7 +766,7 @@ static int ipaddr_list_or_flush(int argc, char **argv, int flush)
 			struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 			struct nlmsg_list *a;
 
-			for (a=ainfo; a; a=a->next) {
+			for (a = ainfo.first; a; a = a->next) {
 				struct nlmsghdr *n = &a->h;
 				struct ifaddrmsg *ifa = NLMSG_DATA(n);
 

@@ -807,12 +813,12 @@ static int ipaddr_list_or_flush(int argc, char **argv, int flush)
 		}
 	}
 
-	for (l=linfo; l; l = n) {
+	for (l = linfo.first; l; l = n) {
 		n = l->next;
 		if (no_link || print_linkinfo(NULL, &l->h, stdout) == 0) {
 			struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 			if (filter.family != AF_PACKET)
-				print_selected_addrinfo(ifi->ifi_index, ainfo, stdout);
+				print_selected_addrinfo(ifi->ifi_index, ainfo.first, stdout);
 		}
 		fflush(stdout);
 		free(l);