Lockpick_RCM/bdk/libs/lvgl/lv_misc/lv_ll.c

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2020-06-26 22:17:06 +02:00
/**
* @file lv_ll.c
* Handle linked lists.
* The nodes are dynamically allocated by the 'lv_mem' module,
*/
/*********************
* INCLUDES
*********************/
#include <stdint.h>
#include <string.h>
#include "lv_ll.h"
#include "lv_mem.h"
/*********************
* DEFINES
*********************/
#define LL_NODE_META_SIZE (sizeof(lv_ll_node_t*) + sizeof(lv_ll_node_t*))
#define LL_PREV_P_OFFSET(ll_p) (ll_p->n_size)
#define LL_NEXT_P_OFFSET(ll_p) (ll_p->n_size + sizeof(lv_ll_node_t*))
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void node_set_prev(lv_ll_t * ll_p, lv_ll_node_t * act, lv_ll_node_t * prev);
static void node_set_next(lv_ll_t * ll_p, lv_ll_node_t * act, lv_ll_node_t * next);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Initialize linked list
* @param ll_dsc pointer to ll_dsc variable
* @param node_size the size of 1 node in bytes
*/
void lv_ll_init(lv_ll_t * ll_p, uint32_t node_size)
{
ll_p->head = NULL;
ll_p->tail = NULL;
#ifdef LV_MEM_ENV64
/*Round the size up to 8*/
if(node_size & 0x7) {
node_size = node_size & (~0x7);
node_size += 8;
}
#else
/*Round the size up to 4*/
if(node_size & 0x3) {
node_size = node_size & (~0x3);
node_size += 4;
}
#endif
ll_p->n_size = node_size;
}
/**
* Add a new head to a linked list
* @param ll_p pointer to linked list
* @return pointer to the new head
*/
void * lv_ll_ins_head(lv_ll_t * ll_p)
{
lv_ll_node_t * n_new;
n_new = lv_mem_alloc(ll_p->n_size + LL_NODE_META_SIZE);
if(n_new != NULL) {
node_set_prev(ll_p, n_new, NULL); /*No prev. before the new head*/
node_set_next(ll_p, n_new, ll_p->head); /*After new comes the old head*/
if(ll_p->head != NULL) { /*If there is old head then before it goes the new*/
node_set_prev(ll_p, ll_p->head, n_new);
}
ll_p->head = n_new; /*Set the new head in the dsc.*/
if(ll_p->tail == NULL) {/*If there is no tail (1. node) set the tail too*/
ll_p->tail = n_new;
}
}
return n_new;
}
/**
* Insert a new node in front of the n_act node
* @param ll_p pointer to linked list
* @param n_act pointer a node
* @return pointer to the new head
*/
void * lv_ll_ins_prev(lv_ll_t * ll_p, void * n_act)
{
lv_ll_node_t * n_new;
lv_ll_node_t * n_prev;
if(NULL == ll_p || NULL == n_act) return NULL;
if(lv_ll_get_head(ll_p) == n_act) {
n_new = lv_ll_ins_head(ll_p);
if(n_new == NULL) return NULL;
} else {
n_new = lv_mem_alloc(ll_p->n_size + LL_NODE_META_SIZE);
if(n_new == NULL) return NULL;
n_prev = lv_ll_get_prev(ll_p, n_act);
node_set_next(ll_p, n_prev, n_new);
node_set_prev(ll_p, n_new, n_prev);
node_set_prev(ll_p, n_act, n_new);
node_set_next(ll_p, n_new, n_act);
}
return n_new;
}
/**
* Add a new tail to a linked list
* @param ll_p pointer to linked list
* @return pointer to the new tail
*/
void * lv_ll_ins_tail(lv_ll_t * ll_p)
{
lv_ll_node_t * n_new;
n_new = lv_mem_alloc(ll_p->n_size + LL_NODE_META_SIZE);
if(n_new == NULL) return NULL;
if(n_new != NULL) {
node_set_next(ll_p, n_new, NULL); /*No next after the new tail*/
node_set_prev(ll_p, n_new, ll_p->tail); /*The prev. before new is tho old tail*/
if(ll_p->tail != NULL) { /*If there is old tail then the new comes after it*/
node_set_next(ll_p, ll_p->tail, n_new);
}
ll_p->tail = n_new; /*Set the new tail in the dsc.*/
if(ll_p->head == NULL) { /*If there is no head (1. node) set the head too*/
ll_p->head = n_new;
}
}
return n_new;
}
/**
* Remove the node 'node_p' from 'll_p' linked list.
* It does not free the the memory of node.
* @param ll_p pointer to the linked list of 'node_p'
* @param node_p pointer to node in 'll_p' linked list
*/
void lv_ll_rem(lv_ll_t * ll_p, void * node_p)
{
if(lv_ll_get_head(ll_p) == node_p) {
/*The new head will be the node after 'n_act'*/
ll_p->head = lv_ll_get_next(ll_p, node_p);
if(ll_p->head == NULL) {
ll_p->tail = NULL;
} else {
node_set_prev(ll_p, ll_p->head, NULL);
}
} else if(lv_ll_get_tail(ll_p) == node_p) {
/*The new tail will be the node before 'n_act'*/
ll_p->tail = lv_ll_get_prev(ll_p, node_p);
if(ll_p->tail == NULL) {
ll_p->head = NULL;
} else {
node_set_next(ll_p, ll_p->tail, NULL);
}
} else {
lv_ll_node_t * n_prev = lv_ll_get_prev(ll_p, node_p);
lv_ll_node_t * n_next = lv_ll_get_next(ll_p, node_p);
node_set_next(ll_p, n_prev, n_next);
node_set_prev(ll_p, n_next, n_prev);
}
}
/**
* Remove and free all elements from a linked list. The list remain valid but become empty.
* @param ll_p pointer to linked list
*/
void lv_ll_clear(lv_ll_t * ll_p)
{
void * i;
void * i_next;
i = lv_ll_get_head(ll_p);
i_next = NULL;
while(i != NULL) {
i_next = lv_ll_get_next(ll_p, i);
lv_ll_rem(ll_p, i);
lv_mem_free(i);
i = i_next;
}
}
/**
* Move a node to a new linked list
* @param ll_ori_p pointer to the original (old) linked list
* @param ll_new_p pointer to the new linked list
* @param node pointer to a node
*/
void lv_ll_chg_list(lv_ll_t * ll_ori_p, lv_ll_t * ll_new_p, void * node)
{
lv_ll_rem(ll_ori_p, node);
/*Set node as head*/
node_set_prev(ll_new_p, node, NULL);
node_set_next(ll_new_p, node, ll_new_p->head);
if(ll_new_p->head != NULL) { /*If there is old head then before it goes the new*/
node_set_prev(ll_new_p, ll_new_p->head, node);
}
ll_new_p->head = node; /*Set the new head in the dsc.*/
if(ll_new_p->tail == NULL) { /*If there is no tail (first node) set the tail too*/
ll_new_p->tail = node;
}
}
/**
* Return with head node of the linked list
* @param ll_p pointer to linked list
* @return pointer to the head of 'll_p'
*/
void * lv_ll_get_head(const lv_ll_t * ll_p)
{
void * head = NULL;
if(ll_p != NULL) {
head = ll_p->head;
}
return head;
}
/**
* Return with tail node of the linked list
* @param ll_p pointer to linked list
* @return pointer to the head of 'll_p'
*/
void * lv_ll_get_tail(const lv_ll_t * ll_p)
{
void * tail = NULL;
if(ll_p != NULL) {
tail = ll_p->tail;
}
return tail;
}
/**
* Return with the pointer of the next node after 'n_act'
* @param ll_p pointer to linked list
* @param n_act pointer a node
* @return pointer to the next node
*/
void * lv_ll_get_next(const lv_ll_t * ll_p, const void * n_act)
{
void * next = NULL;
if(ll_p != NULL) {
const lv_ll_node_t * n_act_d = n_act;
memcpy(&next, n_act_d + LL_NEXT_P_OFFSET(ll_p), sizeof(void *));
}
return next;
}
/**
* Return with the pointer of the previous node after 'n_act'
* @param ll_p pointer to linked list
* @param n_act pointer a node
* @return pointer to the previous node
*/
void * lv_ll_get_prev(const lv_ll_t * ll_p, const void * n_act)
{
void * prev = NULL;
if(ll_p != NULL) {
const lv_ll_node_t * n_act_d = n_act;
memcpy(&prev, n_act_d + LL_PREV_P_OFFSET(ll_p), sizeof(void *));
}
return prev;
}
void lv_ll_swap(lv_ll_t * ll_p, void * n1_p, void * n2_p)
{
(void)(ll_p);
(void)(n1_p);
(void)(n2_p);
/*TODO*/
}
/**
* Move a nodw before an other node in the same linked list
* @param ll_p pointer to a linked list
* @param n_act pointer to node to move
* @param n_after pointer to a node which should be after `n_act`
*/
void lv_ll_move_before(lv_ll_t * ll_p, void * n_act, void * n_after)
{
if(n_act == n_after) return; /*Can't move before itself*/
void * n_before;
if(n_after != NULL) n_before = lv_ll_get_prev(ll_p, n_after);
else n_before = lv_ll_get_tail(ll_p); /*if `n_after` is NULL `n_act` should be the new tail*/
if(n_act == n_before) return; /*Already before `n_after`*/
/*It's much easier to remove from the list and add again*/
lv_ll_rem(ll_p, n_act);
/*Add again by setting the prev. and next nodes*/
node_set_next(ll_p, n_before, n_act);
node_set_prev(ll_p, n_act, n_before);
node_set_prev(ll_p, n_after, n_act);
node_set_next(ll_p, n_act, n_after);
/*If `n_act` was moved before NULL then it become the new tail*/
if(n_after == NULL) ll_p->tail = n_act;
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Set the 'pervious node pointer' of a node
* @param ll_p pointer to linked list
* @param act pointer to a node which prev. node pointer should be set
* @param prev pointer to a node which should be the previous node before 'act'
*/
static void node_set_prev(lv_ll_t * ll_p, lv_ll_node_t * act, lv_ll_node_t * prev)
{
if(act == NULL) return; /*Can't set the prev node of `NULL`*/
uint32_t node_p_size = sizeof(lv_ll_node_t *);
if(prev) memcpy(act + LL_PREV_P_OFFSET(ll_p), &prev, node_p_size);
else memset(act + LL_PREV_P_OFFSET(ll_p), 0, node_p_size);
}
/**
* Set the 'next node pointer' of a node
* @param ll_p pointer to linked list
* @param act pointer to a node which next node pointer should be set
* @param next pointer to a node which should be the next node before 'act'
*/
static void node_set_next(lv_ll_t * ll_p, lv_ll_node_t * act, lv_ll_node_t * next)
{
if(act == NULL) return; /*Can't set the next node of `NULL`*/
uint32_t node_p_size = sizeof(lv_ll_node_t *);
if(next) memcpy(act + LL_NEXT_P_OFFSET(ll_p), &next, node_p_size);
else memset(act + LL_NEXT_P_OFFSET(ll_p), 0, node_p_size);
}