pinebuds/services/nvrecord/list_ext.c

256 lines
8.3 KiB
C

/***************************************************************************
*
* Copyright 2015-2019 BES.
* All rights reserved. All unpublished rights reserved.
*
* No part of this work may be used or reproduced in any form or by any
* means, or stored in a database or retrieval system, without prior written
* permission of BES.
*
* Use of this work is governed by a license granted by BES.
* This work contains confidential and proprietary information of
* BES. which is protected by copyright, trade secret,
* trademark and other intellectual property rights.
*
****************************************************************************/
#include "stdio.h"
#include "cmsis_os.h"
#include "hal_trace.h"
#include "string.h"
#include "list_ext.h"
static list_node_t *list_free_node_ext(list_t *list, list_node_t *node);
void *zmalloc_ext (size_t size){
void *ptr = NULL;
ptr = pool_malloc(size);
memset(ptr, 0, size);
return ptr;
}
// Returns a new, empty list. Returns NULL if not enough memory could be allocated
// for the list structure. The returned list must be freed with |list_free|. The
// |callback| specifies a function to be called whenever a list element is removed
// from the list. It can be used to release resources held by the list element, e.g.
// memory or file descriptor. |callback| may be NULL if no cleanup is necessary on
// element removal.
list_t *list_new_ext(list_free_cb callback) {
list_t *list = (list_t *)zmalloc_ext(sizeof(list_t));
if (list)
list->free_cb = callback;
return list;
}
// Frees the list. This function accepts NULL as an argument, in which case it
// behaves like a no-op.
void list_free_ext(list_t *list) {
if (list != NULL)
list_clear_ext(list);
pool_free(list);
}
// Returns true if the list is empty (has no elements), false otherwise.
// Note that a NULL list is not the same as an empty list. This function
// does not accept a NULL list.
bool list_is_empty_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
return (list->length == 0);
}
// Returns the length of the list. This function does not accept a NULL list.
size_t list_length_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
return list->length;
}
// Returns the first element in the list without removing it. |list| may not
// be NULL or empty.
void *list_front_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
bool nRet = list_is_empty_ext(list);
ASSERT(!nRet,"%s",__func__);
return list->head->data;
}
// Returns the last element in the list without removing it. |list| may not
// be NULL or empty.
void *list_back_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
bool nRet = list_is_empty_ext(list);
ASSERT(!nRet,"%s",__func__);
return list->tail->data;
}
bool list_insert_after_ext(list_t *list, list_node_t *prev_node, void *data) {
list_node_t *node = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(prev_node != NULL,"%s",__func__);
ASSERT(data != NULL,"%s",__func__);
node = (list_node_t *)pool_malloc(sizeof(list_node_t));
if (!node)
return false;
node->next = prev_node->next;
node->data = data;
prev_node->next = node;
if (list->tail == prev_node)
list->tail = node;
++list->length;
return true;
}
#include "stdio.h"
// Inserts |data| at the beginning of |list|. Neither |data| nor |list| may be NULL.
// This function does not make a copy of |data| so the pointer must remain valid
// at least until the element is removed from the list or the list is freed.
// Returns true if |data| could be inserted, false otherwise (e.g. out of memory).
bool list_prepend_ext(list_t *list, void *data) {
list_node_t *node = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(data != NULL,"%s",__func__);
node = (list_node_t *)zmalloc_ext(sizeof(list_node_t));
if (!node)
return false;
node->next = list->head;
node->data = data;
list->head = node;
if (list->tail == NULL)
list->tail = list->head;
++list->length;
return true;
}
// Inserts |data| at the end of |list|. Neither |data| nor |list| may be NULL.
// This function does not make a copy of |data| so the pointer must remain valid
// at least until the element is removed from the list or the list is freed.
// Returns true if |data| could be inserted, false otherwise (e.g. out of memory).
bool list_append_ext(list_t *list, void *data) {
list_node_t *node = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(data != NULL,"%s",__func__);
node = (list_node_t *)pool_malloc(sizeof(list_node_t));
if (!node)
return false;
node->next = NULL;
node->data = data;
if (list->tail == NULL) {
list->head = node;
list->tail = node;
} else {
list->tail->next = node;
list->tail = node;
}
++list->length;
return true;
}
// Removes |data| from the list. Neither |list| nor |data| may be NULL. If |data|
// is inserted multiple times in the list, this function will only remove the first
// instance. If a free function was specified in |list_new|, it will be called back
// with |data|. This function returns true if |data| was found in the list and removed,
// false otherwise.
bool list_remove_ext(list_t *list, void *data) {
list_node_t *prev = NULL, *node = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(data != NULL,"%s",__func__);
if (list_is_empty_ext(list))
return false;
if (list->head->data == data) {
list_node_t *next = list_free_node_ext(list, list->head);
if (list->tail == list->head)
list->tail = next;
list->head = next;
return true;
}
for (prev = list->head, node = list->head->next; node; prev = node, node = node->next)
if (node->data == data) {
prev->next = list_free_node_ext(list, node);
if (list->tail == node)
list->tail = prev;
return true;
}
return false;
}
// Removes all elements in the list. Calling this function will return the list to the
// same state it was in after |list_new|. |list| may not be NULL.
void list_clear_ext(list_t *list) {
list_node_t *node = NULL;
ASSERT(list != NULL,"%s",__func__);
for (node = list->head; node; )
node = list_free_node_ext(list, node);
list->head = NULL;
list->tail = NULL;
list->length = 0;
}
// Iterates through the entire |list| and calls |callback| for each data element.
// If the list is empty, |callback| will never be called. It is safe to mutate the
// list inside the callback. If an element is added before the node being visited,
// there will be no callback for the newly-inserted node. Neither |list| nor
// |callback| may be NULL.
void list_foreach_ext(const list_t *list, list_iter_cb callback) {
list_node_t *node = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(callback != NULL,"%s",__func__);
for (node = list->head; node; ) {
list_node_t *next = node->next;
callback(node->data);
node = next;
}
}
// Returns an iterator to the first element in |list|. |list| may not be NULL.
// The returned iterator is valid as long as it does not equal the value returned
// by |list_end|.
list_node_t *list_begin_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
return list->head;
}
// Returns an iterator that points past the end of the list. In other words,
// this function returns the value of an invalid iterator for the given list.
// When an iterator has the same value as what's returned by this function, you
// may no longer call |list_next| with the iterator. |list| may not be NULL.
list_node_t *list_end_ext(const list_t *list) {
ASSERT(list != NULL,"%s",__func__);
return NULL;
}
// Given a valid iterator |node|, this function returns the next value for the
// iterator. If the returned value equals the value returned by |list_end|, the
// iterator has reached the end of the list and may no longer be used for any
// purpose.
list_node_t *list_next_ext(const list_node_t *node) {
ASSERT(node != NULL,"%s",__func__);
return node->next;
}
// Returns the value stored at the location pointed to by the iterator |node|.
// |node| must not equal the value returned by |list_end|.
void *list_node_ext(const list_node_t *node) {
ASSERT(node != NULL,"%s",__func__);
return node->data;
}
static list_node_t *list_free_node_ext(list_t *list, list_node_t *node) {
list_node_t *next = NULL;
ASSERT(list != NULL,"%s",__func__);
ASSERT(node != NULL,"%s",__func__);
next = node->next;
if (list->free_cb)
list->free_cb(node->data);
pool_free(node);
--list->length;
return next;
}