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/* void_list.c - the itsy package management system
Carl D. Worth
Copyright (C) 2001 University of Southern California
This program 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 2, or (at
your option) any later version.
This program 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.
*/
#include "ipkg.h"
#include <errno.h>
#include "void_list.h"
int void_list_elt_init(void_list_elt_t *elt, void *data)
{
elt->next = NULL;
elt->data = data;
return 0;
}
void void_list_elt_deinit(void_list_elt_t *elt)
{
void_list_elt_init(elt, NULL);
}
int void_list_init(void_list_t *list)
{
void_list_elt_init(&list->pre_head, NULL);
list->head = NULL;
list->pre_head.next = list->head;
list->tail = NULL;
return 0;
}
void void_list_deinit(void_list_t *list)
{
void_list_elt_t *elt;
while (list->head) {
elt = void_list_pop(list);
void_list_elt_deinit(elt);
/* malloced in void_list_append */
free(elt);
}
}
int void_list_append(void_list_t *list, void *data)
{
void_list_elt_t *elt;
/* freed in void_list_deinit */
elt = malloc(sizeof(void_list_elt_t));
if (elt == NULL) {
fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
return ENOMEM;
}
void_list_elt_init(elt, data);
if (list->tail) {
list->tail->next = elt;
list->tail = elt;
} else {
list->head = elt;
list->pre_head.next = list->head;
list->tail = elt;
}
return 0;
}
int void_list_push(void_list_t *list, void *data)
{
void_list_elt_t *elt;
elt = malloc(sizeof(void_list_elt_t));
if (elt == NULL) {
fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
return ENOMEM;
}
void_list_elt_init(elt, data);
elt->next = list->head;
list->head->next = elt;
if (list->tail == NULL) {
list->tail = list->head;
}
return 0;
}
void_list_elt_t *void_list_pop(void_list_t *list)
{
void_list_elt_t *elt;
elt = list->head;
if (list->head) {
list->head = list->head->next;
list->pre_head.next = list->head;
if (list->head == NULL) {
list->tail = NULL;
}
}
return elt;
}
void *void_list_remove(void_list_t *list, void_list_elt_t **iter)
{
void_list_elt_t *prior;
void_list_elt_t *old_elt;
void *old_data;
old_elt = *iter;
old_data = old_elt->data;
if (old_elt == list->head) {
prior = &list->pre_head;
void_list_pop(list);
} else {
for (prior = list->head; prior; prior = prior->next) {
if (prior->next == old_elt) {
break;
}
}
if (prior == NULL || prior->next != old_elt) {
fprintf(stderr, "%s: ERROR: element not found in list\n", __FUNCTION__);
return NULL;
}
prior->next = old_elt->next;
if (old_elt == list->tail) {
list->tail = prior;
}
}
void_list_elt_deinit(old_elt);
*iter = prior;
return old_data;
}
/* remove element containing elt data, using cmp(elt->data, target_data) == 0. */
void *void_list_remove_elt(void_list_t *list, const void *target_data, void_list_cmp_t cmp)
{
void_list_elt_t *prior;
void_list_elt_t *old_elt = NULL;
void *old_data = NULL;
/* first element */
if (list->head && list->head->data && (cmp(list->head->data, target_data) == 0)) {
old_elt = list->head;
old_data = list->head->data;
void_list_pop(list);
} else {
int found = 0;
for (prior = list->head; prior && prior->next; prior = prior->next) {
if (prior->next->data && (cmp(prior->next->data, target_data) == 0)) {
old_elt = prior->next;
old_data = old_elt->data;
found = 1;
break;
}
}
if (!found) {
return NULL;
}
prior->next = old_elt->next;
if (old_elt == list->tail) {
list->tail = prior;
}
}
if (old_elt)
void_list_elt_deinit(old_elt);
if (old_data)
return old_data;
else
return NULL;
}
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