/* Copyright (c) 2011, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "linked_list.h"
#include <stdio.h>
#include <string.h>
#define LOG_TAG "LocSvc_utils_ll"
#include "log_util.h"
#include "platform_lib_includes.h"
#include <stdlib.h>
#include <stdint.h>
typedef struct list_element {
struct list_element* next;
struct list_element* prev;
void* data_ptr;
void (*dealloc_func)(void*);
}list_element;
typedef struct list_state {
list_element* p_head;
list_element* p_tail;
} list_state;
/* ----------------------- END INTERNAL FUNCTIONS ---------------------------------------- */
/*===========================================================================
FUNCTION: linked_list_init
===========================================================================*/
linked_list_err_type linked_list_init(void** list_data)
{
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_PARAMETER;
}
list_state* tmp_list;
tmp_list = (list_state*)calloc(1, sizeof(list_state));
if( tmp_list == NULL )
{
LOC_LOGE("%s: Unable to allocate space for list!\n", __FUNCTION__);
return eLINKED_LIST_FAILURE_GENERAL;
}
tmp_list->p_head = NULL;
tmp_list->p_tail = NULL;
*list_data = tmp_list;
return eLINKED_LIST_SUCCESS;
}
/*===========================================================================
FUNCTION: linked_list_destroy
===========================================================================*/
linked_list_err_type linked_list_destroy(void** list_data)
{
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_HANDLE;
}
list_state* p_list = (list_state*)*list_data;
linked_list_flush(p_list);
free(*list_data);
*list_data = NULL;
return eLINKED_LIST_SUCCESS;
}
/*===========================================================================
FUNCTION: linked_list_add
===========================================================================*/
linked_list_err_type linked_list_add(void* list_data, void *data_obj, void (*dealloc)(void*))
{
LOC_LOGD("%s: Adding to list data_obj = 0x%p\n", __FUNCTION__, data_obj);
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_HANDLE;
}
if( data_obj == NULL )
{
LOC_LOGE("%s: Invalid input parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_PARAMETER;
}
list_state* p_list = (list_state*)list_data;
list_element* elem = (list_element*)malloc(sizeof(list_element));
if( elem == NULL )
{
LOC_LOGE("%s: Memory allocation failed\n", __FUNCTION__);
return eLINKED_LIST_FAILURE_GENERAL;
}
/* Copy data to newly created element */
elem->data_ptr = data_obj;
elem->next = NULL;
elem->prev = NULL;
elem->dealloc_func = dealloc;
/* Replace head element */
list_element* tmp = p_list->p_head;
p_list->p_head = elem;
/* Point next to the previous head element */
p_list->p_head->next = tmp;
if( tmp != NULL )
{
tmp->prev = p_list->p_head;
}
else
{
p_list->p_tail = p_list->p_head;
}
return eLINKED_LIST_SUCCESS;
}
/*===========================================================================
FUNCTION: linked_list_remove
===========================================================================*/
linked_list_err_type linked_list_remove(void* list_data, void **data_obj)
{
LOC_LOGD("%s: Removing from list\n", __FUNCTION__);
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_HANDLE;
}
if( data_obj == NULL )
{
LOC_LOGE("%s: Invalid input parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_PARAMETER;
}
list_state* p_list = (list_state*)list_data;
if( p_list->p_tail == NULL )
{
return eLINKED_LIST_UNAVAILABLE_RESOURCE;
}
list_element* tmp = p_list->p_tail;
/* Replace tail element */
p_list->p_tail = tmp->prev;
if( p_list->p_tail != NULL )
{
p_list->p_tail->next = NULL;
}
else
{
p_list->p_head = p_list->p_tail;
}
/* Copy data to output param */
*data_obj = tmp->data_ptr;
/* Free allocated list element */
free(tmp);
return eLINKED_LIST_SUCCESS;
}
/*===========================================================================
FUNCTION: linked_list_empty
===========================================================================*/
int linked_list_empty(void* list_data)
{
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return (int)eLINKED_LIST_INVALID_HANDLE;
}
else
{
list_state* p_list = (list_state*)list_data;
return p_list->p_head == NULL ? 1 : 0;
}
}
/*===========================================================================
FUNCTION: linked_list_flush
===========================================================================*/
linked_list_err_type linked_list_flush(void* list_data)
{
if( list_data == NULL )
{
LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
return eLINKED_LIST_INVALID_HANDLE;
}
list_state* p_list = (list_state*)list_data;
/* Remove all dynamically allocated elements */
while( p_list->p_head != NULL )
{
list_element* tmp = p_list->p_head->next;
/* Free data pointer if told to do so. */
if( p_list->p_head->dealloc_func != NULL )
{
p_list->p_head->dealloc_func(p_list->p_head->data_ptr);
}
/* Free list element */
free(p_list->p_head);
p_list->p_head = tmp;
}
p_list->p_tail = NULL;
return eLINKED_LIST_SUCCESS;
}
/*===========================================================================
FUNCTION: linked_list_search
===========================================================================*/
linked_list_err_type linked_list_search(void* list_data, void **data_p,
bool (*equal)(void* data_0, void* data),
void* data_0, bool rm_if_found)
{
LOC_LOGD("%s: Search the list\n", __FUNCTION__);
if( list_data == NULL || NULL == equal )
{
LOC_LOGE("%s: Invalid list parameter! list_data %p equal %p\n",
__FUNCTION__, list_data, equal);
return eLINKED_LIST_INVALID_HANDLE;
}
list_state* p_list = (list_state*)list_data;
if( p_list->p_tail == NULL )
{
return eLINKED_LIST_UNAVAILABLE_RESOURCE;
}
list_element* tmp = p_list->p_head;
if (NULL != data_p) {
*data_p = NULL;
}
while (NULL != tmp) {
if ((*equal)(data_0, tmp->data_ptr)) {
if (NULL != data_p) {
*data_p = tmp->data_ptr;
}
if (rm_if_found) {
if (NULL == tmp->prev) {
p_list->p_head = tmp->next;
} else {
tmp->prev->next = tmp->next;
}
if (NULL == tmp->next) {
p_list->p_tail = tmp->prev;
} else {
tmp->next->prev = tmp->prev;
}
tmp->prev = tmp->next = NULL;
// dealloc data if it is not copied out && caller
// has given us a dealloc function pointer.
if (NULL == data_p && NULL != tmp->dealloc_func) {
tmp->dealloc_func(tmp->data_ptr);
}
free(tmp);
}
tmp = NULL;
} else {
tmp = tmp->next;
}
}
return eLINKED_LIST_SUCCESS;
}