cli: make APInfo parameter to fill_output_access_point() constth/nmcli-wifi-in-use

It's helpful to control when data/state gets mutated. In particular,
when passing on a pointer via several hops. C can help with that
at compile time via "const".

But the "index" field of APInfo is actually mutable, as it counts
the lines. So most of the data is immutable, but the index.

Make APInfo const. But to do that, the mutable part must be moved to a
separate place.

Also, start with the counter initialized to zero instead of one.
It is just nicer.

1 files changed, 27 insertions, 20 deletions

diff --git a/src/nmcli/devices.c b/src/nmcli/devices.c
index f5519fe3fb..ded2a9eb8c 100644
--- a/src/nmcli/devices.c
+++ b/src/nmcli/devices.c
@@ -1250,18 +1250,16 @@ sort_access_points(const GPtrArray *aps)
 
 typedef struct {
     NmCli         *nmc;
-    int            index;
-    guint32        output_flags;
     NMAccessPoint *active_ap;
     const char    *device;
     GPtrArray     *output_data;
+    int           *p_index;
+    guint32        output_flags;
 } APInfo;
 
 static void
-fill_output_access_point(gpointer data, gpointer user_data)
+fill_output_access_point(NMAccessPoint *ap, const APInfo *info)
 {
-    NMAccessPoint         *ap   = NM_ACCESS_POINT(data);
-    APInfo                *info = user_data;
     NmcOutputField        *arr;
     gboolean               active;
     NM80211ApFlags         flags;
@@ -1344,7 +1342,7 @@ fill_output_access_point(gpointer data, gpointer user_data)
     arr = nmc_dup_fields_array((const NMMetaAbstractInfo *const *) nmc_fields_dev_wifi_list,
                                info->output_flags);
 
-    ap_name = g_strdup_printf("AP[%d]", info->index++); /* AP */
+    ap_name = g_strdup_printf("AP[%d]", ++(*info->p_index)); /* AP */
     set_val_str(arr, 0, ap_name);
     set_val_str(arr, 1, ssid_str);
     set_val_str(arr, 2, ssid_hex_str);
@@ -1377,6 +1375,12 @@ fill_output_access_point(gpointer data, gpointer user_data)
     g_ptr_array_add(info->output_data, arr);
 }
 
+static void
+fill_output_access_point_void(gpointer data, gpointer user_data)
+{
+    fill_output_access_point(data, user_data);
+}
+
 static char *
 bluetooth_caps_to_string(NMBluetoothCapabilities caps)
 {
@@ -1695,10 +1699,11 @@ show_device_info(NMDevice *device, NmCli *nmc)
                 g_ptr_array_add(out.output_data, arr);
 
                 {
-                    gs_unref_ptrarray GPtrArray *aps  = NULL;
-                    APInfo                       info = {
+                    gs_unref_ptrarray GPtrArray *aps        = NULL;
+                    int                          info_index = 0;
+                    const APInfo                 info       = {
                                               .nmc          = nmc,
-                                              .index        = 1,
+                                              .p_index      = &info_index,
                                               .output_flags = NMC_OF_FLAG_SECTION_PREFIX,
                                               .active_ap    = active_ap,
                                               .device       = nm_device_get_iface(device),
@@ -1707,7 +1712,7 @@ show_device_info(NMDevice *device, NmCli *nmc)
 
                     aps = sort_access_points(
                         nm_device_wifi_get_access_points(NM_DEVICE_WIFI(device)));
-                    g_ptr_array_foreach(aps, fill_output_access_point, &info);
+                    g_ptr_array_foreach(aps, fill_output_access_point_void, (gpointer) &info);
                 }
 
                 print_data_prepare_width(out.output_data);
@@ -2994,10 +2999,11 @@ show_access_point_info(NMDeviceWifi *wifi, NmCli *nmc, NmcOutputData *out)
     g_ptr_array_add(out->output_data, arr);
 
     {
-        gs_unref_ptrarray GPtrArray *aps  = NULL;
-        APInfo                       info = {
+        gs_unref_ptrarray GPtrArray *aps        = NULL;
+        int                          info_index = 0;
+        const APInfo                 info       = {
                                   .nmc          = nmc,
-                                  .index        = 1,
+                                  .p_index      = &info_index,
                                   .output_flags = 0,
                                   .active_ap    = active_ap,
                                   .device       = nm_device_get_iface(NM_DEVICE(wifi)),
@@ -3005,7 +3011,7 @@ show_access_point_info(NMDeviceWifi *wifi, NmCli *nmc, NmcOutputData *out)
         };
 
         aps = sort_access_points(nm_device_wifi_get_access_points(wifi));
-        g_ptr_array_foreach(aps, fill_output_access_point, &info);
+        g_ptr_array_foreach(aps, fill_output_access_point_void, (gpointer) &info);
     }
 
     print_data_prepare_width(out->output_data);
@@ -3049,12 +3055,13 @@ wifi_print_aps(NMDeviceWifi                    *wifi,
                 ap = candidate_ap;
         }
         if (ap) {
-            APInfo info = {
-                .nmc          = nmc,
-                .index        = 1,
-                .output_flags = 0,
-                .device       = nm_device_get_iface(NM_DEVICE(wifi)),
-                .output_data  = out.output_data,
+            int          info_index = 0;
+            const APInfo info       = {
+                      .nmc          = nmc,
+                      .p_index      = &info_index,
+                      .output_flags = 0,
+                      .device       = nm_device_get_iface(NM_DEVICE(wifi)),
+                      .output_data  = out.output_data,
             };
 
             /* Add headers (field names) */