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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 the direction and the last position for access to the
* internal library tables/lists.
*
* It's very unusual to use the same iterator on multiple places in your
* application or share the same iterator, for this purpose libfdisk does not
* provide reference counting for this object. It's recommended to initialize
* the iterator by fdisk_new_iter() at begin of your function and then
* fdisk_free_iter() before you return from the function.
*
* Don't forget to call fdisk_reset_iter() if you want to use the iterator more
* than once.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "fdiskP.h"
/**
* fdisk_new_iter:
* @direction: FDISK_INTER_{FOR,BACK}WARD direction
*
* Returns: newly allocated generic libmount iterator.
*/
struct fdisk_iter *fdisk_new_iter(int direction)
{
struct fdisk_iter *itr = calloc(1, sizeof(*itr));
if (!itr)
return NULL;
itr->direction = direction;
return itr;
}
/**
* fdisk_free_iter:
* @itr: iterator pointer
*
* Deallocates the iterator.
*/
void fdisk_free_iter(struct fdisk_iter *itr)
{
free(itr);
}
/**
* fdisk_reset_iter:
* @itr: iterator pointer
* @direction: FDISK_ITER_{FOR,BACK}WARD or -1 to keep the direction unchanged
*
* Resets the iterator.
*/
void fdisk_reset_iter(struct fdisk_iter *itr, int direction)
{
if (direction == -1)
direction = itr->direction;
memset(itr, 0, sizeof(*itr));
itr->direction = direction;
}
/**
* fdisk_iter_get_direction:
* @itr: iterator pointer
*
* Returns: FDISK_INTER_{FOR,BACK}WARD
*/
int fdisk_iter_get_direction(struct fdisk_iter *itr)
{
return itr->direction;
}
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