User selectable sort criteria.

options.h

@@ -18,6 +18,14 @@ typedef enum {
   OPTION_PORTS_ON
 } option_port_t;
 
+typedef enum {
+  OPTION_SORT_DIV1,
+  OPTION_SORT_DIV2,
+  OPTION_SORT_DIV3,
+  OPTION_SORT_SRC,
+  OPTION_SORT_DEST
+} option_sort_t;
+
 typedef struct {
     /* interface on which to listen */
     char *interface;
@@ -39,6 +47,7 @@ typedef struct {
     int paused;
     int showhelp;
     int bandwidth_in_bytes;
+    option_sort_t sort;
 
 } options_t;