+/* we use these to find out if we edited the cylinder or weightsystem entries */
+static cylinder_t remember_cyl[MAX_CYLINDERS];
+static weightsystem_t remember_ws[MAX_WEIGHTSYSTEMS];
+#define CYL_BYTES sizeof(cylinder_t) * MAX_CYLINDERS
+#define WS_BYTES sizeof(weightsystem_t) * MAX_WEIGHTSYSTEMS
+
+void save_equipment_data(struct dive *dive)
+{
+ if (dive) {
+ memcpy(remember_cyl, dive->cylinder, CYL_BYTES);
+ memcpy(remember_ws, dive->weightsystem, WS_BYTES);
+ }
+}
+
+/* the editing happens on the master dive; we copy the equipment
+ data if it has changed in the master dive and the other dive
+ either has no entries for the equipment or the same entries
+ as the master dive had before it was edited */
+void update_equipment_data(struct dive *dive, struct dive *master)
+{
+ if (dive == master)
+ return;
+ if ( ! cylinders_equal(remember_cyl, master->cylinder) &&
+ (no_cylinders(dive->cylinder) ||
+ cylinders_equal(dive->cylinder, remember_cyl)))
+ memcpy(dive->cylinder, master->cylinder, CYL_BYTES);
+ if (! weightsystems_equal(remember_ws, master->weightsystem) &&
+ (no_weightsystems(dive->weightsystem) ||
+ weightsystems_equal(dive->weightsystem, remember_ws)))
+ memcpy(dive->weightsystem, master->weightsystem, WS_BYTES);
+}
+
+/* A negative index means "all selected" */
+int edit_multi_dive_info(int index)