1 files changed, 78 insertions, 0 deletions
diff --git a/libmount/src/iter.c b/libmount/src/iter.c
new file mode 100644
index 0000000..891e2c8
--- /dev/null
+++ b/libmount/src/iter.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * This file is part of libmount from util-linux project.
+ *
+ * Copyright (C) 2009-2018 Karel Zak <kzak@redhat.com>
+ *
+ * libmount is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * SECTION: iter
+ * @title: Iterator
+ * @short_description: unified iterator
+ *
+ * The iterator keeps the direction and the last position
+ * for access to the internal library tables/lists.
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "mountP.h"
+
+/**
+ * mnt_new_iter:
+ * @direction: MNT_INTER_{FOR,BACK}WARD direction
+ *
+ * Returns: newly allocated generic libmount iterator.
+ */
+struct libmnt_iter *mnt_new_iter(int direction)
+{
+	struct libmnt_iter *itr = calloc(1, sizeof(*itr));
+	if (!itr)
+		return NULL;
+	itr->direction = direction;
+	return itr;
+}
+
+/**
+ * mnt_free_iter:
+ * @itr: iterator pointer
+ *
+ * Deallocates the iterator.
+ */
+void mnt_free_iter(struct libmnt_iter *itr)
+{
+	free(itr);
+}
+
+/**
+ * mnt_reset_iter:
+ * @itr: iterator pointer
+ * @direction: MNT_INTER_{FOR,BACK}WARD or -1 to keep the direction unchanged
+ *
+ * Resets the iterator.
+ */
+void mnt_reset_iter(struct libmnt_iter *itr, int direction)
+{
+	if (direction == -1)
+		direction = itr->direction;
+
+	memset(itr, 0, sizeof(*itr));
+	itr->direction = direction;
+}
+
+/**
+ * mnt_iter_get_direction:
+ * @itr: iterator pointer
+ *
+ * Returns: MNT_INTER_{FOR,BACK}WARD
+ */
+int mnt_iter_get_direction(struct libmnt_iter *itr)
+{
+	return itr->direction;
+}