conf: added "used" flag to struct block_param

src/conf.c

@@ -139,6 +139,7 @@ config_new_param(const char *value, int line)
 
 	ret->num_block_params = 0;
 	ret->block_params = NULL;
+	ret->used = false;
 
 	return ret;
 }
@@ -210,6 +211,7 @@ config_add_block_param(struct config_param * param, const char *name,
 	bp->name = g_strdup(name);
 	bp->value = g_strdup(value);
 	bp->line = line;
+	bp->used = false;
 }
 
 static struct config_param *
@@ -356,7 +358,7 @@ config_get_next_param(const char *name, const struct config_param * last)
 		return NULL;
 
 	param = node->data;
-
+	param->used = true;
 	return param;
 }
 
@@ -418,6 +420,7 @@ config_get_block_param(const struct config_param * param, const char *name)
 	for (unsigned i = 0; i < param->num_block_params; i++) {
 		if (0 == strcmp(name, param->block_params[i].name)) {
 			struct block_param *bp = &param->block_params[i];
+			bp->used = true;
 			return bp;
 		}
 	}

src/conf.h

@@ -75,6 +75,12 @@ struct block_param {
 	char *name;
 	char *value;
 	int line;
+
+	/**
+	 * This flag is false when nobody has queried the value of
+	 * this option yet.
+	 */
+	bool used;
 };
 
 struct config_param {
@@ -83,6 +89,12 @@ struct config_param {
 
 	struct block_param *block_params;
 	unsigned num_block_params;
+
+	/**
+	 * This flag is false when nobody has queried the value of
+	 * this option yet.
+	 */
+	bool used;
 };
 
 void config_global_init(void);