Do not display localnet info with --plain option (#159)

* Do not display localnet info with --plain option

* Updated ChangeLog

ChangeLog

@@ -1,9 +1,16 @@
+2023-03-09 Roy Hills <royhills@hotmail.com>
+
+	* arp-scan.c: Don't display the localnet info ("Target list from
+	  interface: network X netmask Y") if the --plain option is given.
+	  https://github.com/royhills/arp-scan/issues/158
+
 2023-03-09 Roy Hills <royhills@hotmail.com>
 
 	* arp-scan.c, arp-scan.h, arp-scan.1.dist: Added the ${IPnum} output
 	  field, which displays the host IPv4 address as a 32-bit integer.
 	  This permits sorting by IP address using simple numeric comparison.
 	  Thanks to @gspannu for the feature request.
+	  https://github.com/royhills/arp-scan/issues/156
 
 2023-02-26 Roy Hills <royhills@hotmail.com>
 

arp-scan.c

@@ -427,8 +427,10 @@ main(int argc, char *argv[]) {
       cp = my_ntoa(if_netmask);
       c_netmask = make_message("%s", cp);
       snprintf(localnet_descr, 32, "%s:%s", c_network, c_netmask);
-      warn_msg("Target list from interface network %s netmask %s",
-               c_network, c_netmask);
+      if (!plain_flag) {
+         warn_msg("Target list from interface: network %s netmask %s",
+                  c_network, c_netmask);
+      }
       free(c_network);
       free(c_netmask);
       add_host_pattern(localnet_descr, timeout);