ucx: src/linked_list.c@da66264af8ad (annotated)

src/linked_list.c@da66264af8ad (annotated)

src/linked_list.c

Sun, 26 Sep 2021 15:26:43 +0200

author: Mike Becker <universe@uap-core.de>
date: Sun, 26 Sep 2021 15:26:43 +0200
changeset 428: da66264af8ad
parent 423: 4cea6e50175b
child 435: 0fe204d50f54
permissions: -rw-r--r--

fix special cases for linked_list_add

 /*
  * 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 <stdint.h>
 #include <string.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, ptrdiff_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, ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node) {
     void *last = cx_linked_list_last(begin, end, loc_next);
     if (last == NULL) {
         if (begin == NULL) {
             // no current list and no begin ptr to write to - we don't find something to append to
             return 1;
         } else {
             // start fresh list
             *begin = new_node;
         }
     } else {
         // if there is a last node, update its next pointer
         void **next = CX_LL_PTR(last, loc_next);
         *next = new_node;
     }
     // if there is an end pointer, update it
     if (end != NULL) {
         *end = cx_linked_list_last(&new_node, NULL, loc_next);
     }
     // if the nodes use a prev pointer, update it
     if (loc_prev >= 0) {
         void **prev = CX_LL_PTR(new_node, loc_prev);
         *prev = last;
     }
     return 0;
 }
 /* HIGH LEVEL LINKED LIST IMPLEMENTATION */
 struct cx_linked_list_node {
     void *prev;
     void *next;
     char payload[];
 };
 typedef struct {
     void *begin;
     void *end;
     ptrdiff_t loc_prev;
     ptrdiff_t loc_next;
 } cx_linked_list;
 int cx_ll_add(cx_list *list, void *elem) {
     cx_linked_list *listdata = (cx_linked_list *) list->listdata;
     CxAllocator allocator = list->allocator;
     struct cx_linked_list_node *node = cxMalloc(allocator,
                                                 sizeof(struct cx_linked_list_node) + list->itemsize);
     if (node == NULL)
         return 1;
     node->next = NULL;
     memcpy(node->payload, elem, list->itemsize);
     int ret = cx_linked_list_add(
             &listdata->begin,
             &listdata->end,
             offsetof(struct cx_linked_list_node, prev),
             offsetof(struct cx_linked_list_node, next),
             node
     );
     if (ret == 0) {
         list->size++;
         return 0;
     } else {
         return ret;
     }
 }
 int cx_ll_insert(cx_list *list, size_t index, void *elem) {
     cx_linked_list *listdata = (cx_linked_list *) list->listdata;
     // TODO: implement using low level API
     return 1;
 }
 void *cx_ll_remove(cx_list *list, size_t index) {
     cx_linked_list *listdata = (cx_linked_list *) list->listdata;
     // TODO: implement using low level API
     return NULL;
 }
 size_t cx_ll_find(cx_list *list, void *elem) {
     cx_linked_list *listdata = (cx_linked_list *) list->listdata;
     // TODO: implement using low level API
     return 0;
 }
 void *cx_ll_last(cx_list *list) {
     cx_linked_list *listdata = (cx_linked_list *) list->listdata;
     struct cx_linked_list_node *last = cx_linked_list_last(
             NULL, &listdata->end, offsetof(struct cx_linked_list_node, next));
     return &last->payload;
 }
 cx_list_class cx_linked_list_class = {
         cx_ll_add,
         cx_ll_insert,
         cx_ll_remove,
         cx_ll_find,
         cx_ll_last
 };
 CxList cxLinkedListCreate(CxAllocator allocator, CxListComparator comparator, size_t item_size) {
     CxList list = cxMalloc(allocator, sizeof(cx_list_s) + sizeof(cx_linked_list));
     if (list == NULL)
         return NULL;
     list->cl = &cx_linked_list_class;
     list->data.allocator = allocator;
     list->data.cmpfunc = comparator;
     list->data.itemsize = item_size;
     list->data.capacity = SIZE_MAX;
     cx_linked_list *ll = (cx_linked_list *) list->data.listdata;
     ll->begin = NULL;
     ll->loc_prev = offsetof(struct cx_linked_list_node, prev);
     ll->loc_next = offsetof(struct cx_linked_list_node, next);
     cxLinkedListRecalculateSize(list);
     return list;
 }
 void cxLinkedListDestroy(CxList list) {
     // TODO: free contents
     cxFree(list->data.allocator, list);
 }
 size_t cxLinkedListRecalculateSize(CxList list) {
     cx_linked_list *ll = (cx_linked_list *) list->data.listdata;
     if (ll->begin == NULL) {
         list->data.size = 0;
         ll->end = NULL;
         return 0;
     } else {
         void *cur = ll->begin;
         void *last;
         size_t size;
         do {
             last = cur;
             size++;
         } while ((cur = *CX_LL_PTR(cur, ll->loc_next)) != NULL);
         ll->end = last;
         list->data.size = size;
         return size;
     }
 }

Mercurial > hg > ucx / annotate

src/linked_list.c@da66264af8ad (annotated)

src/linked_list.c