1 files changed, 74 insertions, 0 deletions
diff --git a/libsmartcols/src/iter.c b/libsmartcols/src/iter.c
new file mode 100644
index 0000000..91cc080
--- /dev/null
+++ b/libsmartcols/src/iter.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2009-2014 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+/**
+ * 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 <string.h>
+#include <stdlib.h>
+
+#include "smartcolsP.h"
+
+/**
+ * scols_new_iter:
+ * @direction: SCOLS_INTER_{FOR,BACK}WARD direction
+ *
+ * Returns: newly allocated generic libmount iterator.
+ */
+struct libscols_iter *scols_new_iter(int direction)
+{
+	struct libscols_iter *itr = calloc(1, sizeof(*itr));
+	if (!itr)
+		return NULL;
+	itr->direction = direction;
+	return itr;
+}
+
+/**
+ * scols_free_iter:
+ * @itr: iterator pointer
+ *
+ * Deallocates the iterator.
+ */
+void scols_free_iter(struct libscols_iter *itr)
+{
+	free(itr);
+}
+
+/**
+ * scols_reset_iter:
+ * @itr: iterator pointer
+ * @direction: SCOLS_INTER_{FOR,BACK}WARD or -1 to keep the direction unchanged
+ *
+ * Resets the iterator.
+ */
+void scols_reset_iter(struct libscols_iter *itr, int direction)
+{
+	if (direction == -1)
+		direction = itr->direction;
+
+	memset(itr, 0, sizeof(*itr));
+	itr->direction = direction;
+}
+
+/**
+ * scols_iter_get_direction:
+ * @itr: iterator pointer
+ *
+ * Returns: SCOLS_INTER_{FOR,BACK}WARD
+ */
+int scols_iter_get_direction(const struct libscols_iter *itr)
+{
+	return itr->direction;
+}