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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 The ScummVM project
*
* The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
*
* 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
* of the License, 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.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "saga/saga.h"
#include "saga/yslib.h"
namespace Saga {
YS_DL_LIST *ys_dll_create() {
YS_DL_LIST *new_list;
new_list = (YS_DL_LIST *)malloc(sizeof *new_list);
if (new_list != NULL) {
new_list->next = new_list;
new_list->prev = new_list;
// Sentinel is marked by self-referential node data.
// No other link is permitted to do this
new_list->data = new_list;
}
return new_list;
}
void ys_dll_destroy(YS_DL_LIST *list) {
YS_DL_NODE *walk_p;
YS_DL_NODE *temp_p;
for (walk_p = list->next; walk_p != list; walk_p = temp_p) {
temp_p = walk_p->next;
free(walk_p->data);
free(walk_p);
}
free(list);
return;
}
void *ys_dll_get_data(YS_DL_NODE *node) {
return node->data;
}
YS_DL_NODE *ys_dll_head(YS_DL_LIST *list) {
return (list->next != list) ? list->next : NULL;
}
YS_DL_NODE *ys_dll_tail(YS_DL_LIST *list) {
return (list->prev != list) ? list->prev : NULL;
}
YS_DL_NODE *ys_dll_next(YS_DL_NODE *node) {
return (node->next != (YS_DL_LIST *) node->next->data) ? node->next : NULL;
}
YS_DL_NODE *ys_dll_prev(YS_DL_NODE *node) {
return (node->prev != (YS_DL_LIST *) node->prev->data) ? node->prev : NULL;
}
YS_DL_NODE *ys_dll_add_head(YS_DL_LIST *list, void *data, size_t size) {
YS_DL_NODE *new_node;
void *new_data;
new_node = (YS_DL_NODE *)malloc(sizeof *new_node);
if (new_node) {
new_data = malloc(size);
if (new_data) {
memcpy(new_data, data, size);
new_node->data = new_data;
new_node->prev = list;
new_node->next = list->next;
new_node->next->prev = new_node;
list->next = new_node;
}
}
return new_node;
}
YS_DL_NODE *ys_dll_add_tail(YS_DL_LIST *list, void *data, size_t size) {
YS_DL_NODE *new_node;
void *new_data;
new_node = (YS_DL_NODE *)malloc(sizeof *new_node);
if (new_node != NULL) {
new_data = malloc(size);
if (new_data != NULL) {
memcpy(new_data, data, size);
new_node->data = new_data;
new_node->next = list;
new_node->prev = list->prev;
new_node->prev->next = new_node;
list->prev = new_node;
}
}
return new_node;
}
YS_DL_NODE *ys_dll_insert(YS_DL_NODE *list, void *data, size_t size, YS_COMPARE_FUNC *compare) {
YS_DL_NODE *walk_p;
YS_DL_NODE *new_node;
int result;
for (walk_p = list->next; walk_p != list; walk_p = walk_p->next) {
result = compare(data, walk_p->data);
if (result < 0) {
new_node = ys_dll_preinsert(walk_p, data, size);
return new_node;
}
}
new_node = ys_dll_add_tail(list, data, size);
return new_node;
}
int ys_dll_delete(YS_DL_NODE *node) {
if (node == NULL) {
return YS_E_FAILURE;
}
node->next->prev = node->prev;
node->prev->next = node->next;
free(node->data);
free(node);
return YS_E_SUCCESS;
}
void ys_dll_delete_all(YS_DL_LIST *list) {
YS_DL_NODE *walk_p;
YS_DL_NODE *temp_p;
for (walk_p = list->next; walk_p != list; walk_p = temp_p) {
temp_p = walk_p->next;
free(walk_p->data);
free(walk_p);
}
list->next = list;
list->prev = list;
}
YS_DL_NODE *ys_dll_replace(YS_DL_NODE *node, void *data, size_t size) {
void *new_data;
if ((node == NULL) || (data == NULL) || (!size)) {
return NULL;
}
new_data = malloc(size);
if (new_data == NULL) {
return NULL;
}
free(node->data);
node->data = new_data;
memcpy(new_data, data, size);
return node;
}
int ys_dll_reorder_up(YS_DL_NODE *list, YS_DL_NODE *olink, YS_COMPARE_FUNC *compare) {
YS_DL_NODE *walk_p;
int result;
int reorder = 0;
for (walk_p = olink->prev; walk_p != list; walk_p = walk_p->prev) {
result = compare(walk_p->data, olink->data);
if (result <= 0) {
reorder = 1;
break;
}
}
if (reorder) {
// Unlink original link
olink->next->prev = olink->prev;
olink->prev->next = olink->next;
// Reinsert after walk link
olink->prev = walk_p;
olink->next = walk_p->next;
olink->next->prev = olink;
walk_p->next = olink;
}
return YS_E_SUCCESS;
}
int ys_dll_reorder_down(YS_DL_NODE *list, YS_DL_NODE *olink, YS_COMPARE_FUNC *compare) {
YS_DL_NODE *walk_p;
int result;
int reorder = 0;
for (walk_p = olink->next; walk_p != list; walk_p = walk_p->next) {
result = compare(walk_p->data, olink->data);
if (result >= 0) {
reorder = 1;
break;
}
}
if (reorder) {
// Unlink original link
olink->next->prev = olink->prev;
olink->prev->next = olink->next;
//Reinsert before walk link
olink->next = walk_p;
olink->prev = walk_p->prev;
olink->prev->next = olink;
walk_p->prev = olink;
}
return YS_E_SUCCESS;
}
} // End of namespace Saga
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