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/* libmisc/linkedlist.c - Singly- and doubly- linked lists
*
* Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <stddef.h> /* for NULL */
#include <libmisc/linkedlist.h>
/* singly linked list *********************************************************/
void lm_sll_push_to_rear(lm_sll_root *root, lm_sll_node *node) {
assert(root);
node->rear = NULL;
if (root->rear)
root->rear->rear = node;
else
root->front = node;
root->rear = node;
}
void lm_sll_pop_from_front(lm_sll_root *root) {
assert(root);
assert(root->front);
root->front = root->front->rear;
if (!root->front)
root->rear = NULL;
}
/* doubly linked list *********************************************************/
void lm_dll_push_to_rear(lm_dll_root *root, lm_dll_node *node) {
assert(root);
assert(node);
node->front = root->rear;
node->rear = NULL;
if (root->rear)
root->rear->rear = node;
else
root->front = node;
root->rear = node;
}
void lm_dll_remove(lm_dll_root *root, lm_dll_node *node) {
assert(root);
assert(node);
if (node->front)
node->front->rear = node->rear;
else
root->front = node->rear;
if (node->rear)
node->rear->front = node->front;
else
root->rear = node->front;
}
void lm_dll_pop_from_front(lm_dll_root *root) {
assert(root);
assert(root->front);
lm_dll_remove(root, root->front);
}
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