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/* active_list.h - the opkg package management system
Tick Chen <tick@openmoko.com>
Copyright (C) 2008 Openmoko Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
*/
#include "active_list.h"
#include <stdio.h>
void active_list_init(struct active_list *ptr) {
INIT_LIST_HEAD(&ptr->node);
INIT_LIST_HEAD(&ptr->depend);
ptr->walked=0;
ptr->depended = NULL;
}
/**
*/
struct active_list * active_list_next(struct active_list *head, struct active_list *ptr) {
struct active_list *next=NULL;
if (!head || !ptr) {
fprintf(stderr, "active_list_prev head = %p, ptr = %p invalid value!!\n", head, ptr);
return NULL;
}
if (ptr == head) {
head->walked = !head->walked;
next = list_entry(ptr->node.next, struct active_list, node);
if (next == head)
return NULL;
return active_list_next(head, next);
}
if (ptr->depend.next != &ptr->depend) {
next = list_entry(ptr->depend.next, struct active_list, node);
if (head->walked != next->walked) {
ptr->walked = head->walked;
return active_list_next(head, next);
}
}
if (ptr->walked != head->walked) {
ptr->walked = head->walked;
return ptr;
}
if (ptr->depended && ptr->node.next == &ptr->depended->depend ) {
return ptr->depended;
}
if (ptr->node.next != &head->node) {
next = list_entry(ptr->node.next, struct active_list, node);
return active_list_next(head, next);
}
return NULL;
}
void active_list_clear(struct active_list *head) {
}
void active_list_add_depend(struct active_list *node, struct active_list *depend) {
list_del_init(&depend->node);
list_add_tail(&depend->node, &node->depend);
depend->depended = node;
}
void active_list_add(struct active_list *head, struct active_list *node) {
list_del_init(&node->node);
list_add_tail(&node->node, &head->node);
}
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