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/*
* Copyright (C) 2000, Matias Atria
*
* 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 of the License, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "common.h"
void listh_init(ListHead *head)
{
head->head = head->tail = NULL;
head->count = 0;
}
void listh_prepend(ListHead *head, List *list)
{
list->prev = NULL;
list->next = head->head;
if(head->head)
head->head->prev = list;
head->head = list;
if(!head->tail)
head->tail = list;
head->count++;
}
void listh_append(ListHead *head, List *list)
{
list->next = NULL;
list->prev = head->tail;
if(head->tail)
head->tail->next = list;
else
head->head = list;
head->tail = list;
head->count++;
}
void listh_add_before(ListHead *head, List *at, List *list)
{
if(at == head->head || head->head == NULL)
listh_prepend(head, list);
else {
list->next = at;
list->prev = at->prev;
at->prev = list;
head->count++;
}
}
void listh_add_after(ListHead *head, List *at, List *list)
{
if(at == head->tail || !head->tail)
listh_append(head, list);
else {
list->prev = at;
list->next = at->next;
at->next = list;
head->count++;
}
}
void listh_remove(ListHead *head, List *list)
{
if(list == head->head) {
head->head = list->next;
if(head->head)
head->head->prev = NULL;
} else if(list == head->tail) {
head->tail = list->prev;
if(head->tail)
head->tail->next = NULL;
} else {
list->next->prev = list->prev;
list->prev->next = list->next;
}
if(--head->count == 0)
head->head = head->tail = NULL;
}
void listh_concat(ListHead *h1, ListHead *h2)
{
if(h2->head == NULL)
; /* do nothing */
else if(h1->tail == NULL)
h1->head = h2->head;
else {
h1->tail->next = h2->head;
h2->head->prev = h1->tail;
}
h1->tail = h2->tail;
h1->count += h2->count;
}
void listh_catcon(ListHead *h1, ListHead *h2)
{
if(h2->head == NULL)
; /* do nothing */
else if(h1->head == NULL)
h1->tail = h2->tail;
else {
h1->head->prev = h2->tail;
h2->tail->next = h1->head;
}
h1->head = h2->head;
h1->count += h2->count;
}
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