ucx: src/linked_list.c@8d506ed6c1c0 (annotated)

src/linked_list.c@8d506ed6c1c0 (annotated)

src/linked_list.c

Sun, 07 Feb 2021 19:42:12 +0100

author: Mike Becker <universe@uap-core.de>
date: Sun, 07 Feb 2021 19:42:12 +0100
changeset 398: 8d506ed6c1c0
child 399: 8902fcd1e057
permissions: -rw-r--r--

adds first draft for linked list implementation

 /*
  * 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
  * 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 "cx/linked_list.h"
 #include <stddef.h>
 /* LOW LEVEL LINKED LIST FUNCTIONS */
 #define CX_LL_PTR(cur, off) ((void**)(((char*)cur)+off))
 void *cx_linked_list_last(void **begin, void **end, off_t loc_next) {
     if (end != NULL) {
         return *end;
     } else {
         if (begin == NULL || *begin == NULL)
             return NULL;
         void *cur = *begin;
         void *last;
         do {
             last = cur;
         } while ((cur = *CX_LL_PTR(cur, loc_next)) != NULL);
         return last;
     }
 }
 int cx_linked_list_add(void **begin, void **end, off_t loc_next, off_t loc_prev, void *newnode) {
     // TODO: how do we report error messages?
     if (loc_next < 0 || (begin == NULL && end == NULL)) {
         return 1;
     }
     void *last = cx_linked_list_last(begin, end, loc_next);
     if (last == NULL) {
         if (begin == NULL) {
             return 1;
         } else {
             *begin = newnode;
             return 0;
         }
     }
     void **next = CX_LL_PTR(last, loc_next);
     *next = newnode;
     if (loc_prev >= 0) {
         void **prev = CX_LL_PTR(newnode, loc_prev);
         *prev = last;
     }
     return 0;
 }
 /* HIGH LEVEL LINKED LIST IMPLEMENTATION */
 typedef struct cx_list_node_s cx_list_node;
 struct cx_list_node_s {
     cx_list_node *next;
     cx_list_node *prev;
     void *data;
 };
 typedef struct {
     cx_list_node *begin;
     cx_list_node *end;
     size_t size;
 } cx_linked_list;
 int cx_ll_add(cx_list *list, void *elem) {
     cx_linked_list *listdata = list->listdata;
     CxAllocator allocator = list->allocator;
     struct cx_list_node_s *node = cxMalloc(allocator, sizeof(struct cx_list_node_s));
     if (node == NULL)
         return 1;
     int ret = cx_linked_list_add(
             (void **) &listdata->begin,
             (void **) &listdata->end,
             offsetof(struct cx_list_node_s, next),
             offsetof(struct cx_list_node_s, prev),
             node
     );
     if (ret == 0) {
         listdata->size++;
         return 0;
     } else {
         return ret;
     }
 }
 int cx_ll_insert(cx_list *list, size_t index, void *elem) {
     cx_linked_list *listdata = list->listdata;
     // TODO: implement using low level API
     return 1;
 }
 void *cx_ll_remove(cx_list *list, size_t index) {
     cx_linked_list *listdata = list->listdata;
     // TODO: implement using low level API
     return NULL;
 }
 size_t cx_ll_find(cx_list *list, void *elem) {
     cx_linked_list *listdata = list->listdata;
     // TODO: implement using low level API
     return 0;
 }
 size_t cx_ll_size(cx_list *list) {
     cx_linked_list *listdata = list->listdata;
     return listdata->size;
 }
 cx_list_class cx_linked_list_class = {
         cx_ll_add,
         cx_ll_insert,
         cx_ll_remove,
         cx_ll_find,
         cx_ll_size
 };
 CxList cxLinkedListCreate(CxAllocator allocator, CxListComparator comparator) {
     CxList list = cxMalloc(allocator, sizeof(list));
     if (list == NULL)
         return NULL;
     list->cl = &cx_linked_list_class;
     list->data.allocator = allocator;
     list->data.cmpfunc = comparator;
     list->data.listdata = cxCalloc(allocator, 1, sizeof(cx_linked_list));
     if (list->data.listdata == NULL) {
         cxFree(allocator, list);
         return NULL;
     }
 }

Mercurial > hg > ucx / annotate

src/linked_list.c@8d506ed6c1c0 (annotated)

src/linked_list.c