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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>
#include <string.h>
#include <stdlib.h>
#include "libbb/libbb.h"
void active_list_init(struct active_list *ptr) {
INIT_LIST_HEAD(&ptr->node);
INIT_LIST_HEAD(&ptr->depend);
ptr->depended = NULL;
}
/**
*/
struct active_list * active_list_next(struct active_list *head, struct active_list *ptr) {
struct active_list *next=NULL;
if ( !head ) {
opkg_msg(ERROR, "Internal error: head=%p, ptr=%p\n", head, ptr);
return NULL;
}
if ( !ptr )
ptr = head;
next = list_entry(ptr->node.next, struct active_list, node);
if ( next == head ) {
return NULL;
}
if ( ptr->depended && &ptr->depended->depend == ptr->node.next ) {
return ptr->depended;
}
while ( next->depend.next != &next->depend ) {
next = list_entry(next->depend.next, struct active_list, node);
}
return next;
}
struct active_list * active_list_prev(struct active_list *head, struct active_list *ptr) {
struct active_list *prev=NULL;
if ( !head ) {
opkg_msg(ERROR, "Internal error: head=%p, ptr=%p\n", head, ptr);
return NULL;
}
if ( !ptr )
ptr = head;
if ( ptr->depend.prev != &ptr->depend ) {
prev = list_entry(ptr->depend.prev, struct active_list, node);
return prev;
}
if ( ptr->depended && ptr->depended != head && &ptr->depended->depend == ptr->node.prev ) {
prev = list_entry(ptr->depended->node.prev, struct active_list, node);
} else
prev = list_entry(ptr->node.prev, struct active_list, node);
if ( prev == head )
return NULL;
return prev;
}
struct active_list *active_list_move_node(struct active_list *old_head, struct active_list *new_head, struct active_list *node) {
struct active_list *prev;
if (!old_head || !new_head || !node)
return NULL;
if (old_head == new_head)
return node;
prev = active_list_prev(old_head, node);
active_list_add(new_head, node);
return prev;
}
static void list_head_clear (struct list_head *head) {
struct active_list *next;
struct list_head *n, *ptr;
if (!head)
return;
list_for_each_safe(ptr, n , head) {
next = list_entry(ptr, struct active_list, node);
if (next->depend.next != &next->depend) {
list_head_clear(&next->depend);
}
active_list_init(next);
}
}
void active_list_clear(struct active_list *head) {
list_head_clear(&head->node);
if (head->depend.next != &head->depend) {
list_head_clear(&head->depend);
}
active_list_init(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);
node->depended = head;
}
struct active_list * active_list_head_new(void) {
struct active_list * head = xcalloc(1, sizeof(struct active_list));
active_list_init(head);
return head;
}
void active_list_head_delete(struct active_list *head) {
active_list_clear(head);
free(head);
}
/*
* Using insert sort.
* Note. the list should not be large, or it will be very inefficient.
*
*/
struct active_list * active_list_sort(struct active_list *head, int (*compare)(const void *, const void *)) {
struct active_list tmphead;
struct active_list *node, *ptr;
if ( !head )
return NULL;
active_list_init(&tmphead);
for (node = active_list_next(head, NULL); node; node = active_list_next(head, NULL)) {
if (tmphead.node.next == &tmphead.node) {
active_list_move_node(head, &tmphead, node);
} else {
for (ptr = active_list_next(&tmphead, NULL); ptr; ptr=active_list_next(&tmphead, ptr)) {
if (compare(ptr, node) <= 0) {
break;
}
}
if (!ptr) {
active_list_move_node(head, &tmphead, node);
} else {
active_list_move_node(head, ptr, node);
}
}
node->depended = &tmphead;
}
for (ptr = active_list_prev(&tmphead, NULL); ptr; ptr=active_list_prev(&tmphead, NULL)) {
active_list_move_node(&tmphead, head, ptr);
}
return head;
}
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