fix esp_bt_gap_get_bond_device_list bug

Closes https://github.com/espressif/esp-idf/issues/5395

components/bt/common/osi/config.c

@@ -267,6 +267,7 @@ bool config_remove_key(config_t *config, const char *section, const char *key)
     assert(config != NULL);
     assert(section != NULL);
     assert(key != NULL);
+    bool ret;
 
     section_t *sec = section_find(config, section);
     entry_t *entry = entry_find(config, section, key);
@@ -274,7 +275,12 @@ bool config_remove_key(config_t *config, const char *section, const char *key)
         return false;
     }
 
-    return list_remove(sec->entries, entry);
+    ret = list_remove(sec->entries, entry);
+    if (list_length(sec->entries) == 0) {
+        OSI_TRACE_DEBUG("%s remove section name:%s",__func__, section);
+        ret &= config_remove_section(config, section);
+    }
+    return ret;
 }
 
 const config_section_node_t *config_section_begin(const config_t *config)

components/bt/host/bluedroid/api/esp_gap_bt_api.c

@@ -246,7 +246,7 @@ esp_err_t esp_bt_gap_remove_bond_device(esp_bd_addr_t bd_addr)
 int esp_bt_gap_get_bond_device_num(void)
 {
     if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
-        return ESP_FAIL;
+        return ESP_ERR_INVALID_STATE;
     }
     return btc_storage_get_num_bt_bond_devices();
 }
@@ -254,7 +254,6 @@ int esp_bt_gap_get_bond_device_num(void)
 esp_err_t esp_bt_gap_get_bond_device_list(int *dev_num, esp_bd_addr_t *dev_list)
 {
     int ret;
-    int dev_num_total;
 
     if (dev_num == NULL || dev_list == NULL) {
         return ESP_ERR_INVALID_ARG;
@@ -264,12 +263,7 @@ esp_err_t esp_bt_gap_get_bond_device_list(int *dev_num, esp_bd_addr_t *dev_list)
         return ESP_ERR_INVALID_STATE;
     }
 
-    dev_num_total = btc_storage_get_num_bt_bond_devices();
-    if (*dev_num > dev_num_total) {
-        *dev_num = dev_num_total;
-    }
-
-    ret = btc_storage_get_bonded_bt_devices_list((bt_bdaddr_t *)dev_list, *dev_num);
+    ret = btc_storage_get_bonded_bt_devices_list((bt_bdaddr_t *)dev_list, dev_num);
 
     return (ret == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
 }

components/bt/host/bluedroid/btc/core/btc_storage.c

@@ -201,7 +201,6 @@ int btc_storage_get_num_bt_bond_devices(void)
         }
     }
     btc_config_unlock();
-
     return num_dev;
 }
 
@@ -215,15 +214,17 @@ int btc_storage_get_num_bt_bond_devices(void)
 **                  BT_STATUS_FAIL otherwise
 **
 *******************************************************************************/
-bt_status_t btc_storage_get_bonded_bt_devices_list(bt_bdaddr_t *bond_dev, int dev_num)
+bt_status_t btc_storage_get_bonded_bt_devices_list(bt_bdaddr_t *bond_dev, int *dev_num)
 {
     bt_bdaddr_t bd_addr;
+    int in_dev_num = *dev_num; /* buffer size */
+    int out_dev_num = 0; /* bond_dev size */
 
     btc_config_lock();
     for (const btc_config_section_iter_t *iter = btc_config_section_begin(); iter != btc_config_section_end();
             iter = btc_config_section_next(iter)) {
 
-        if (dev_num-- <= 0) {
+        if (in_dev_num <= 0) {
             break;
         }
 
@@ -236,9 +237,12 @@ bt_status_t btc_storage_get_bonded_bt_devices_list(bt_bdaddr_t *bond_dev, int de
             btc_config_exist(name, BTC_STORAGE_LINK_KEY_STR)) {
             string_to_bdaddr(name, &bd_addr);
             memcpy(bond_dev, &bd_addr, sizeof(bt_bdaddr_t));
+            in_dev_num--;
+            out_dev_num++;
             bond_dev++;
         }
     }
+    *dev_num = out_dev_num; /* out_dev_num <= in_dev_num */
     btc_config_unlock();
 
     return BT_STATUS_SUCCESS;

components/bt/host/bluedroid/btc/include/btc/btc_storage.h

@@ -89,6 +89,6 @@ int btc_storage_get_num_bt_bond_devices(void);
 **                  BT_STATUS_FAIL otherwise
 **
 *******************************************************************************/
-bt_status_t btc_storage_get_bonded_bt_devices_list(bt_bdaddr_t *bond_dev, int dev_num);
+bt_status_t btc_storage_get_bonded_bt_devices_list(bt_bdaddr_t *bond_dev, int *dev_num);
 
 #endif /* BTC_STORAGE_H */