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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* Simple generalized doubly-linked lists.
*/
#ifndef DIMENSION_LIST_H
#define DIMENSION_LIST_H
#include <stdlib.h>
#include <string.h>
typedef struct dmnsn_list_iterator {
void *ptr;
size_t obj_size;
struct dmnsn_list_iterator *prev, *next;
} dmnsn_list_iterator;
/* Internal iterator allocation */
DMNSN_INLINE dmnsn_list_iterator *
dmnsn_new_list_iterator(const void *obj, size_t obj_size)
{
dmnsn_list_iterator *i
= (dmnsn_list_iterator *)dmnsn_malloc(sizeof(dmnsn_list_iterator));
i->obj_size = obj_size;
i->prev = NULL;
i->next = NULL;
i->ptr = dmnsn_malloc(obj_size);
memcpy(i->ptr, obj, obj_size);
return i;
}
DMNSN_INLINE void
dmnsn_delete_list_iterator(dmnsn_list_iterator *i)
{
if (i) {
free(i->ptr);
free(i);
}
}
typedef struct dmnsn_list {
dmnsn_list_iterator *first, *last;
size_t obj_size, length;
} dmnsn_list;
/* List allocation */
DMNSN_INLINE dmnsn_list *
dmnsn_new_list(size_t obj_size)
{
dmnsn_list *list = (dmnsn_list *)dmnsn_malloc(sizeof(dmnsn_list));
list->first = NULL;
list->last = NULL;
list->obj_size = obj_size;
list->length = 0;
return list;
}
/* Construction from arrays */
dmnsn_list *dmnsn_list_from_array(const dmnsn_array *array);
/* Delete a list */
void dmnsn_delete_list(dmnsn_list *list);
DMNSN_INLINE dmnsn_list_iterator *
dmnsn_list_first(dmnsn_list *list)
{
return list->first;
}
DMNSN_INLINE dmnsn_list_iterator *
dmnsn_list_last(dmnsn_list *list)
{
return list->last;
}
DMNSN_INLINE dmnsn_list_iterator *
dmnsn_list_prev(dmnsn_list_iterator *i)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
return i->prev;
}
DMNSN_INLINE dmnsn_list_iterator *
dmnsn_list_next(dmnsn_list_iterator *i)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
return i->next;
}
DMNSN_INLINE size_t
dmnsn_list_size(dmnsn_list *list)
{
return list->length;
}
/* Get the i'th object */
DMNSN_INLINE void
dmnsn_list_get(const dmnsn_list_iterator *i, void *obj)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
memcpy(obj, i->ptr, i->obj_size);
}
/* Set the i'th object, expanding the list if necessary */
DMNSN_INLINE void
dmnsn_list_set(dmnsn_list_iterator *i, const void *obj)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
memcpy(i->ptr, obj, i->obj_size);
}
/* Insert an item before `i' */
DMNSN_INLINE void
dmnsn_list_insert(dmnsn_list *list, dmnsn_list_iterator *i, const void *obj)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
dmnsn_list_iterator *j = dmnsn_new_list_iterator(obj, list->obj_size);
if (list->first == i)
list->first = j;
j->next = i;
j->prev = i->prev;
i->prev = j;
++list->length;
}
/* Remove the specified item */
DMNSN_INLINE void
dmnsn_list_remove(dmnsn_list *list, dmnsn_list_iterator *i)
{
if (!i)
dmnsn_error(DMNSN_SEVERITY_HIGH, "NULL list iterator.");
if (list->first == i)
list->first = i->next;
if (list->last == i)
list->last = i->prev;
if (i->prev)
i->prev->next = i->next;
if (i->next)
i->next->prev = i->prev;
dmnsn_delete_list_iterator(i);
--list->length;
}
/* Push obj to the end of the list */
DMNSN_INLINE void
dmnsn_list_push(dmnsn_list *list, const void *obj)
{
dmnsn_list_iterator *i = dmnsn_new_list_iterator(obj, list->obj_size);
if (!list->first) {
list->first = i;
} else {
i->prev = list->last;
i->prev->next = i;
}
list->last = i;
++list->length;
}
/* Pop obj from the end of the list */
DMNSN_INLINE void
dmnsn_list_pop(dmnsn_list *list, void *obj)
{
if (!list->last) {
dmnsn_error(DMNSN_SEVERITY_HIGH, "List is empty.");
}
dmnsn_list_get(list->last, obj);
dmnsn_list_remove(list, list->last);
}
#endif /* DIMENSION_LIST_H */
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