Added a freeEntries method to Preferences library (espressif#1722)

lbernstone · me-no-dev · commit d057e544e01c · 2018-08-14T11:52:01.000+02:00
diff --git a/libraries/Preferences/src/Preferences.cpp b/libraries/Preferences/src/Preferences.cpp
@@ -468,3 +468,13 @@ size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){
     }
     return len;
 }
+
+size_t Preferences::freeEntries() {
+    nvs_stats_t nvs_stats;
+    esp_err_t err = nvs_get_stats(NULL, &nvs_stats);
+    if(err){
+        log_e("Failed to get nvs statistics");
+        return 0;
+    }
+    return nvs_stats.free_entries;
+}
diff --git a/libraries/Preferences/src/Preferences.h b/libraries/Preferences/src/Preferences.h
@@ -64,6 +64,7 @@ class Preferences {
         size_t getString(const char* key, char* value, size_t maxLen);
         String getString(const char* key, String defaultValue = String());
         size_t getBytes(const char* key, void * buf, size_t maxLen);
+        size_t freeEntries();
 };
 
 #endif

Original file line number	Diff line number	Diff line change
`@@ -468,3 +468,13 @@ size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){`
`468`	`468`	`}`
`469`	`469`	`return len;`
`470`	`470`	`}`
	`471`	`+`
	`472`	`+size_t Preferences::freeEntries() {`
	`473`	`+ nvs_stats_t nvs_stats;`
	`474`	`+ esp_err_t err = nvs_get_stats(NULL, &nvs_stats);`
	`475`	`+ if(err){`
	`476`	`+ log_e("Failed to get nvs statistics");`
	`477`	`+ return 0;`
	`478`	`+ }`
	`479`	`+ return nvs_stats.free_entries;`
	`480`	`+}`