src/cx/linked_list.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 */

#ifndef UCX_LINKED_LIST_H
#define UCX_LINKED_LIST_H

#include <stddef.h>
#include "list.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Finds the node at a certain index.
 *
 * This function can be used to start at an arbitrary position within the list.
 * If the search index is large than the start index, \p loc_advance must denote
 * the location of some sort of \c next pointer (i.e. a pointer to the next node).
 * But it is also possible that the search index is smaller than the start index
 * (e.g. in cases where traversing a list backwards is faster) in which case
 * \p loc_advance must denote the location of some sort of \c prev pointer
 * (i.e. a pointer to the previous node).
 *
 * @param start a pointer to the start node
 * @param start_index the start index
 * @param loc_advance the location of the pointer to advance
 * @param index the search index
 * @return the node found at the specified index
 */
void *cx_linked_list_at(void *start, size_t start_index, ptrdiff_t loc_advance, size_t index);

void *cx_linked_list_last(void **begin, void **end, ptrdiff_t loc_next);

int cx_linked_list_add(void **begin, void **end, ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node);

extern cx_list_class cx_linked_list_class;

CxList cxLinkedListCreate(CxAllocator allocator, CxListComparator comparator, size_t item_size);

void cxLinkedListDestroy(CxList list);

size_t cxLinkedListRecalculateSize(CxList list);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* UCX_LINKED_LIST_H */