iface_lists: Access all_ifaces member by reference

Change access of all_ifaces elements from by val to by reference.
With this change unnecessary copying of the whole struct is avoided
but even more important is that elements no longer have to be
removed and inserted whenever data is updated.

This change aims to make it more clear that all_ifaces elements
shall never be removed from the array without freeing resources
via the capture_opts_free_interface_t function.

NOTE: Code for GTK UI not updated

Ping-Bug: 13864
Change-Id: I36742cb1d5c8daa136c9d3732a044a7c8e5c7fe7
Reviewed-on: https://code.wireshark.org/review/23201
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 10 insertions, 16 deletions

diff --git a/ui/qt/capture_interfaces_dialog.cpp b/ui/qt/capture_interfaces_dialog.cpp
index 9938fef49f..72cb2eba6f 100644
--- a/ui/qt/capture_interfaces_dialog.cpp
+++ b/ui/qt/capture_interfaces_dialog.cpp
@@ -247,22 +247,16 @@ void CaptureInterfacesDialog::updateGlobalDeviceSelections()
     while (*iter) {
         QString device_name = (*iter)->data(col_interface_, Qt::UserRole).value<QString>();
         for (guint i = 0; i < global_capture_opts.all_ifaces->len; i++) {
-            interface_t device = g_array_index(global_capture_opts.all_ifaces, interface_t, i);
-            if (device_name.compare(QString().fromUtf8(device.name)) == 0) {
-                if (!device.locked) {
+            interface_t *device = &g_array_index(global_capture_opts.all_ifaces, interface_t, i);
+            if (device_name.compare(QString().fromUtf8(device->name)) == 0) {
+                if (!device->locked) {
                     if ((*iter)->isSelected()) {
-                        device.selected = TRUE;
+                        device->selected = TRUE;
                         global_capture_opts.num_selected++;
                     } else {
-                        device.selected = FALSE;
+                        device->selected = FALSE;
                     }
-                    device.locked = TRUE;
-                    global_capture_opts.all_ifaces = g_array_remove_index(global_capture_opts.all_ifaces, i);
-                    g_array_insert_val(global_capture_opts.all_ifaces, i, device);
-
-                    device.locked = FALSE;
-                    global_capture_opts.all_ifaces = g_array_remove_index(global_capture_opts.all_ifaces, i);
-                    g_array_insert_val(global_capture_opts.all_ifaces, i, device);
+                    device->locked = FALSE;
                 }
                 break;
             }
@@ -284,10 +278,10 @@ void CaptureInterfacesDialog::updateFromGlobalDeviceSelections()
     while (*iter) {
         QString device_name = (*iter)->data(col_interface_, Qt::UserRole).value<QString>();
         for (guint i = 0; i < global_capture_opts.all_ifaces->len; i++) {
-            interface_t device = g_array_index(global_capture_opts.all_ifaces, interface_t, i);
-            if (device_name.compare(QString().fromUtf8(device.name)) == 0) {
-                if ((bool)device.selected != (*iter)->isSelected()) {
-                    (*iter)->setSelected(device.selected);
+            interface_t *device = &g_array_index(global_capture_opts.all_ifaces, interface_t, i);
+            if (device_name.compare(QString().fromUtf8(device->name)) == 0) {
+                if ((bool)device->selected != (*iter)->isSelected()) {
+                    (*iter)->setSelected(device->selected);
                 }
                 break;
             }