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/*
* Copyright (C) 2009 Karel Zak <kzak@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 direction and 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 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 derection unchanged
*
* Resets iterator.
*/
void mnt_reset_iter(struct libmnt_iter *itr, int direction)
{
assert(itr);
if (direction == -1)
direction = itr->direction;
if (itr) {
memset(itr, 0, sizeof(*itr));
itr->direction = direction;
}
}
/**
* mnt_iter_get_direction:
* @itr: iterator pointer
*
* Returns: MNT_INTER_{FOR,BACK}WARD or negative number in case of error.
*/
int mnt_iter_get_direction(struct libmnt_iter *itr)
{
assert(itr);
return itr ? itr->direction : -EINVAL;
}
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