1
0
mirror of https://gitlab.os-k.eu/os-k-team/os-k.git synced 2023-08-25 14:03:10 +02:00
os-k/include/liblist.h
2020-09-27 17:33:48 +02:00

250 lines
5.6 KiB
C

//----------------------------------------------------------------------------//
// OS on Kaleid //
// //
// Desc: Doubly linked lists implementation //
// //
// //
// Copyright © 2018-2020 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 3 of the License, or //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#ifndef _LIBC_H
#include <libc.h>
#endif
#ifndef _LIB_LIST_H
#define _LIB_LIST_H
#ifdef __cplusplus
extern "C" {
#endif
typedef struct ListHead_t ListHead_t;
typedef struct ListNode_t ListNode_t;
//------------------------------------------//
struct ListHead_t
{
ulong length;
ListNode_t *first;
ListNode_t *last;
};
struct ListNode_t
{
ListHead_t *head;
ListNode_t *prev;
ListNode_t *next;
};
//------------------------------------------//
//
// Create a list head with an extern lock
//
static inline
ListHead_t *ExCreateListHead()
{
ListHead_t *head = malloc(sizeof(ListHead_t));
if (head == NULL) return NULL;
head->first = head->last = NULL;
head->length = 0;
return head;
}
static inline
ListNode_t *ExCreateNode()
{
ListNode_t *node = malloc(sizeof(ListNode_t));
if (node == NULL) return NULL;
node->prev = node->next = NULL;
node->head = NULL;
return node;
}
//
// Prepend node at beginning of list
//
static inline
ListHead_t *ExPrependNode(ListHead_t *head, ListNode_t *node)
{
assert(head && node);
node->head = head;
node->prev = NULL;
if (head->length > 0) {
node->next = head->first;
head->first->prev = node;
head->first = node;
}
else {
head->first = node;
head->last = node;
node->next = NULL;
}
head->length++;
return head;
}
//
// Append node at end of list
//
static inline
ListHead_t *ExAppendNode(ListHead_t *head, ListNode_t *node)
{
assert(head && node);
node->head = head;
node->next = NULL;
if (head->length > 0) {
node->prev = head->last;
head->last->next = node;
head->last = node;
}
else {
head->first = node;
head->last = node;
node->prev = NULL;
}
head->length++;
return head;
}
//
// Insert node2 before node1
//
static inline ListHead_t
*ExAddNodeBefore(ListHead_t *head, ListNode_t *node1, ListNode_t *node2)
{
assert(head && node1 && node2 && node1->head == head);
if (head->first == node1) {
return ExPrependNode(head, node2);
}
node2->head = head;
node2->next = node1;
node2->prev = node1->prev;
// node1->prev does exist
// or node1 would be first
node1->prev->next = node2;
node1->prev = node2;
head->length++;
return head;
}
//
// Insert node2 after node1
//
static inline ListHead_t
*ExAddNodeAfter(ListHead_t *head, ListNode_t *node1, ListNode_t *node2)
{
assert(head && node1 && node2 && node1->head == head);
if (head->last == node1) {
return ExAppendNode(head, node2);
}
node2->head = head;
node2->prev = node1;
node2->next = node1->next;
node1->next->prev = node2;
node1->next = node2;
head->length++;
return head;
}
//
// Remove node of list (and frees it)
//
static inline ListHead_t
*ExRemoveNode(ListHead_t *head, ListNode_t *node)
{
assert(head);
assert(node);
assert(head->length > 0);
assert(head && node && head->length > 0 && node->head == head);
if (head->length == 1) {
head->first = head->last = NULL;
goto leave;
}
if (head->first == node) {
head->first = node->next;
node->next->prev = NULL;
}
else if (head->last == node) {
head->last = node->prev;
node->prev->next = NULL;
}
else {
node->prev->next = node->next;
node->next->prev = node->prev;
}
leave:
head->length--;
free(node);
return head;
}
//
// Free a list head
//
static inline void
ExDestroyListHead(ListHead_t *head)
{
assert(head);
free(head);
}
#define ExGetNodeData(list, type) ((type)list)
//------------------------------------------//
#ifdef __cplusplus
}
#endif
#endif