1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "cx/linked_list.h"
30 #include "cx/utils.h"
31 #include "cx/compare.h"
32 #include <string.h>
33 #include <assert.h>
34
35 // LOW LEVEL LINKED LIST FUNCTIONS
36
37 #define CX_LL_PTR(cur, off) (*(void**)(((char*)(cur))+(off)))
38 #define ll_prev(node) CX_LL_PTR(node, loc_prev)
39 #define ll_next(node) CX_LL_PTR(node, loc_next)
40 #define ll_advance(node) CX_LL_PTR(node, loc_advance)
41 #define ll_data(node) (((char*)(node))+loc_data)
42
43 void *cx_linked_list_at(
44 void const *start,
45 size_t start_index,
46 ptrdiff_t loc_advance,
47 size_t index
48 ) {
49 assert(start != NULL);
50 assert(loc_advance >= 0);
51 size_t i = start_index;
52 void const *cur = start;
53 while (i != index && cur != NULL) {
54 cur = ll_advance(cur);
55 i < index ? i++ : i--;
56 }
57 return (void *) cur;
58 }
59
60 ssize_t cx_linked_list_find(
61 void const *start,
62 ptrdiff_t loc_advance,
63 ptrdiff_t loc_data,
64 cx_compare_func cmp_func,
65 void const *elem
66 ) {
67 void *dummy;
68 return cx_linked_list_find_node(
69 &dummy, start,
70 loc_advance, loc_data,
71 cmp_func, elem
72 );
73 }
74
75 ssize_t cx_linked_list_find_node(
76 void **result,
77 void const *start,
78 ptrdiff_t loc_advance,
79 ptrdiff_t loc_data,
80 cx_compare_func cmp_func,
81 void const *elem
82 ) {
83 assert(result != NULL);
84 assert(start != NULL);
85 assert(loc_advance >= 0);
86 assert(loc_data >= 0);
87 assert(cmp_func);
88
89 void const *node = start;
90 ssize_t index = 0;
91 do {
92 void *current = ll_data(node);
93 if (cmp_func(current, elem) == 0) {
94 *result = (void*) node;
95 return index;
96 }
97 node = ll_advance(node);
98 index++;
99 } while (node != NULL);
100 *result = NULL;
101 return -1;
102 }
103
104 void *cx_linked_list_first(
105 void const *node,
106 ptrdiff_t loc_prev
107 ) {
108 return cx_linked_list_last(node, loc_prev);
109 }
110
111 void *cx_linked_list_last(
112 void const *node,
113 ptrdiff_t loc_next
114 ) {
115 assert(node != NULL);
116 assert(loc_next >= 0);
117
118 void const *cur = node;
119 void const *last;
120 do {
121 last = cur;
122 } while ((cur = ll_next(cur)) != NULL);
123
124 return (void *) last;
125 }
126
127 void *cx_linked_list_prev(
128 void const *begin,
129 ptrdiff_t loc_next,
130 void const *node
131 ) {
132 assert(begin != NULL);
133 assert(node != NULL);
134 assert(loc_next >= 0);
135 if (begin == node) return NULL;
136 void const *cur = begin;
137 void const *next;
138 while (1) {
139 next = ll_next(cur);
140 if (next == node) return (void *) cur;
141 cur = next;
142 }
143 }
144
145 void cx_linked_list_link(
146 void *left,
147 void *right,
148 ptrdiff_t loc_prev,
149 ptrdiff_t loc_next
150 ) {
151 assert(loc_next >= 0);
152 ll_next(left) = right;
153 if (loc_prev >= 0) {
154 ll_prev(right) = left;
155 }
156 }
157
158 void cx_linked_list_unlink(
159 void *left,
160 void *right,
161 ptrdiff_t loc_prev,
162 ptrdiff_t loc_next
163 ) {
164 assert (loc_next >= 0);
165 assert(ll_next(left) == right);
166 ll_next(left) = NULL;
167 if (loc_prev >= 0) {
168 assert(ll_prev(right) == left);
169 ll_prev(right) = NULL;
170 }
171 }
172
173 void cx_linked_list_add(
174 void **begin,
175 void **end,
176 ptrdiff_t loc_prev,
177 ptrdiff_t loc_next,
178 void *new_node
179 ) {
180 void *last;
181 if (end == NULL) {
182 assert(begin != NULL);
183 last = *begin == NULL ? NULL : cx_linked_list_last(*begin, loc_next);
184 } else {
185 last = *end;
186 }
187 cx_linked_list_insert_chain(begin, end, loc_prev, loc_next, last, new_node, new_node);
188 }
189
190 void cx_linked_list_prepend(
191 void **begin,
192 void **end,
193 ptrdiff_t loc_prev,
194 ptrdiff_t loc_next,
195 void *new_node
196 ) {
197 cx_linked_list_insert_chain(begin, end, loc_prev, loc_next, NULL, new_node, new_node);
198 }
199
200 void cx_linked_list_insert(
201 void **begin,
202 void **end,
203 ptrdiff_t loc_prev,
204 ptrdiff_t loc_next,
205 void *node,
206 void *new_node
207 ) {
208 cx_linked_list_insert_chain(begin, end, loc_prev, loc_next, node, new_node, new_node);
209 }
210
211 void cx_linked_list_insert_chain(
212 void **begin,
213 void **end,
214 ptrdiff_t loc_prev,
215 ptrdiff_t loc_next,
216 void *node,
217 void *insert_begin,
218 void *insert_end
219 ) {
220 // find the end of the chain, if not specified
221 if (insert_end == NULL) {
222 insert_end = cx_linked_list_last(insert_begin, loc_next);
223 }
224
225 // determine the successor
226 void *successor;
227 if (node == NULL) {
228 assert(begin != NULL || (end != NULL && loc_prev >= 0));
229 if (begin != NULL) {
230 successor = *begin;
231 *begin = insert_begin;
232 } else {
233 successor = *end == NULL ? NULL : cx_linked_list_first(*end, loc_prev);
234 }
235 } else {
236 successor = ll_next(node);
237 cx_linked_list_link(node, insert_begin, loc_prev, loc_next);
238 }
239
240 if (successor == NULL) {
241 // the list ends with the new chain
242 if (end != NULL) {
243 *end = insert_end;
244 }
245 } else {
246 cx_linked_list_link(insert_end, successor, loc_prev, loc_next);
247 }
248 }
249
250 void cx_linked_list_remove(
251 void **begin,
252 void **end,
253 ptrdiff_t loc_prev,
254 ptrdiff_t loc_next,
255 void *node
256 ) {
257 assert(node != NULL);
258 assert(loc_next >= 0);
259 assert(loc_prev >= 0 || begin != NULL);
260
261 // find adjacent nodes
262 void *next = ll_next(node);
263 void *prev;
264 if (loc_prev >= 0) {
265 prev = ll_prev(node);
266 } else {
267 prev = cx_linked_list_prev(*begin, loc_next, node);
268 }
269
270 // update next pointer of prev node, or set begin
271 if (prev == NULL) {
272 if (begin != NULL) {
273 *begin = next;
274 }
275 } else {
276 ll_next(prev) = next;
277 }
278
279 // update prev pointer of next node, or set end
280 if (next == NULL) {
281 if (end != NULL) {
282 *end = prev;
283 }
284 } else if (loc_prev >= 0) {
285 ll_prev(next) = prev;
286 }
287 }
288
289 size_t cx_linked_list_size(
290 void const *node,
291 ptrdiff_t loc_next
292 ) {
293 assert(loc_next >= 0);
294 size_t size = 0;
295 while (node != NULL) {
296 node = ll_next(node);
297 size++;
298 }
299 return size;
300 }
301
302 #ifndef CX_LINKED_LIST_SORT_SBO_SIZE
303 #define CX_LINKED_LIST_SORT_SBO_SIZE 1024
304 #endif
305
306 static void cx_linked_list_sort_merge(
307 ptrdiff_t loc_prev,
308 ptrdiff_t loc_next,
309 ptrdiff_t loc_data,
310 size_t length,
311 void *ls,
312 void *le,
313 void *re,
314 cx_compare_func cmp_func,
315 void **begin,
316 void **end
317 ) {
318 void *sbo[CX_LINKED_LIST_SORT_SBO_SIZE];
319 void **sorted = length >= CX_LINKED_LIST_SORT_SBO_SIZE ?
320 malloc(sizeof(void *) * length) : sbo;
321 if (sorted == NULL) abort();
322 void *rc, *lc;
323
324 lc = ls;
325 rc = le;
326 size_t n = 0;
327 while (lc && lc != le && rc != re) {
328 if (cmp_func(ll_data(lc), ll_data(rc)) <= 0) {
329 sorted[n] = lc;
330 lc = ll_next(lc);
331 } else {
332 sorted[n] = rc;
333 rc = ll_next(rc);
334 }
335 n++;
336 }
337 while (lc && lc != le) {
338 sorted[n] = lc;
339 lc = ll_next(lc);
340 n++;
341 }
342 while (rc && rc != re) {
343 sorted[n] = rc;
344 rc = ll_next(rc);
345 n++;
346 }
347
348 // Update pointer
349 if (loc_prev >= 0) ll_prev(sorted[0]) = NULL;
350 cx_for_n (i, length - 1) {
351 cx_linked_list_link(sorted[i], sorted[i + 1], loc_prev, loc_next);
352 }
353 ll_next(sorted[length - 1]) = NULL;
354
355 *begin = sorted[0];
356 *end = sorted[length-1];
357 if (sorted != sbo) {
358 free(sorted);
359 }
360 }
361
362 void cx_linked_list_sort( // NOLINT(misc-no-recursion) - purposely recursive function
363 void **begin,
364 void **end,
365 ptrdiff_t loc_prev,
366 ptrdiff_t loc_next,
367 ptrdiff_t loc_data,
368 cx_compare_func cmp_func
369 ) {
370 assert(begin != NULL);
371 assert(loc_next >= 0);
372 assert(loc_data >= 0);
373 assert(cmp_func);
374
375 void *lc, *ls, *le, *re;
376
377 // set start node
378 ls = *begin;
379
380 // early exit when this list is empty
381 if (ls == NULL) return;
382
383 // check how many elements are already sorted
384 lc = ls;
385 size_t ln = 1;
386 while (ll_next(lc) != NULL && cmp_func(ll_data(ll_next(lc)), ll_data(lc)) > 0) {
387 lc = ll_next(lc);
388 ln++;
389 }
390 le = ll_next(lc);
391
392 // if first unsorted node is NULL, the list is already completely sorted
393 if (le != NULL) {
394 void *rc;
395 size_t rn = 1;
396 rc = le;
397 // skip already sorted elements
398 while (ll_next(rc) != NULL && cmp_func(ll_data(ll_next(rc)), ll_data(rc)) > 0) {
399 rc = ll_next(rc);
400 rn++;
401 }
402 re = ll_next(rc);
403
404 // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them
405 void *sorted_begin, *sorted_end;
406 cx_linked_list_sort_merge(loc_prev, loc_next, loc_data,
407 ln + rn, ls, le, re, cmp_func,
408 &sorted_begin, &sorted_end);
409
410 // Something left? Sort it!
411 size_t remainder_length = cx_linked_list_size(re, loc_next);
412 if (remainder_length > 0) {
413 void *remainder = re;
414 cx_linked_list_sort(&remainder, NULL, loc_prev, loc_next, loc_data, cmp_func);
415
416 // merge sorted list with (also sorted) remainder
417 cx_linked_list_sort_merge(loc_prev, loc_next, loc_data,
418 ln + rn + remainder_length,
419 sorted_begin, remainder, NULL, cmp_func,
420 &sorted_begin, &sorted_end);
421 }
422 *begin = sorted_begin;
423 if (end) *end = sorted_end;
424 }
425 }
426
427 int cx_linked_list_compare(
428 void const *begin_left,
429 void const *begin_right,
430 ptrdiff_t loc_advance,
431 ptrdiff_t loc_data,
432 cx_compare_func cmp_func
433 ) {
434 void const *left = begin_left, *right = begin_right;
435
436 while (left != NULL && right != NULL) {
437 void const *left_data = ll_data(left);
438 void const *right_data = ll_data(right);
439 int result = cmp_func(left_data, right_data);
440 if (result != 0) return result;
441 left = ll_advance(left);
442 right = ll_advance(right);
443 }
444
445 if (left != NULL) { return 1; }
446 else if (right != NULL) { return -1; }
447 else { return 0; }
448 }
449
450 void cx_linked_list_reverse(
451 void **begin,
452 void **end,
453 ptrdiff_t loc_prev,
454 ptrdiff_t loc_next
455 ) {
456 assert(begin != NULL);
457 assert(loc_next >= 0);
458
459 // swap all links
460 void *prev = NULL;
461 void *cur = *begin;
462 while (cur != NULL) {
463 void *next = ll_next(cur);
464
465 ll_next(cur) = prev;
466 if (loc_prev >= 0) {
467 ll_prev(cur) = next;
468 }
469
470 prev = cur;
471 cur = next;
472 }
473
474 // update begin and end
475 if (end != NULL) {
476 *end = *begin;
477 }
478 *begin = prev;
479 }
480
481 // HIGH LEVEL LINKED LIST IMPLEMENTATION
482
483 typedef struct cx_linked_list_node cx_linked_list_node;
484 struct cx_linked_list_node {
485 cx_linked_list_node *prev;
486 cx_linked_list_node *next;
487 char payload[];
488 };
489
490 #define CX_LL_LOC_PREV offsetof(cx_linked_list_node, prev)
491 #define CX_LL_LOC_NEXT offsetof(cx_linked_list_node, next)
492 #define CX_LL_LOC_DATA offsetof(cx_linked_list_node, payload)
493
494 typedef struct {
495 struct cx_list_s base;
496 cx_linked_list_node *begin;
497 cx_linked_list_node *end;
498 } cx_linked_list;
499
500 static cx_linked_list_node *cx_ll_node_at(
501 cx_linked_list const *list,
502 size_t index
503 ) {
504 if (index >= list->base.collection.size) {
505 return NULL;
506 } else if (index > list->base.collection.size / 2) {
507 return cx_linked_list_at(list->end, list->base.collection.size - 1, CX_LL_LOC_PREV, index);
508 } else {
509 return cx_linked_list_at(list->begin, 0, CX_LL_LOC_NEXT, index);
510 }
511 }
512
513 static int cx_ll_insert_at(
514 struct cx_list_s *list,
515 cx_linked_list_node *node,
516 void const *elem
517 ) {
518
519 // create the new new_node
520 cx_linked_list_node *new_node = cxMalloc(list->collection.allocator,
521 sizeof(cx_linked_list_node) + list->collection.elem_size);
522
523 // sortir if failed
524 if (new_node == NULL) return 1;
525
526 // initialize new new_node
527 new_node->prev = new_node->next = NULL;
528 memcpy(new_node->payload, elem, list->collection.elem_size);
529
530 // insert
531 cx_linked_list *ll = (cx_linked_list *) list;
532 cx_linked_list_insert_chain(
533 (void **) &ll->begin, (void **) &ll->end,
534 CX_LL_LOC_PREV, CX_LL_LOC_NEXT,
535 node, new_node, new_node
536 );
537
538 // increase the size and return
539 list->collection.size++;
540 return 0;
541 }
542
543 static size_t cx_ll_insert_array(
544 struct cx_list_s *list,
545 size_t index,
546 void const *array,
547 size_t n
548 ) {
549 // out-of bounds and corner case check
550 if (index > list->collection.size || n == 0) return 0;
551
552 // find position efficiently
553 cx_linked_list_node *node = index == 0 ? NULL : cx_ll_node_at((cx_linked_list *) list, index - 1);
554
555 // perform first insert
556 if (0 != cx_ll_insert_at(list, node, array)) {
557 return 1;
558 }
559
560 // is there more?
561 if (n == 1) return 1;
562
563 // we now know exactly where we are
564 node = node == NULL ? ((cx_linked_list *) list)->begin : node->next;
565
566 // we can add the remaining nodes and immedately advance to the inserted node
567 char const *source = array;
568 for (size_t i = 1; i < n; i++) {
569 source += list->collection.elem_size;
570 if (0 != cx_ll_insert_at(list, node, source)) {
571 return i;
572 }
573 node = node->next;
574 }
575 return n;
576 }
577
578 static int cx_ll_insert_element(
579 struct cx_list_s *list,
580 size_t index,
581 void const *element
582 ) {
583 return 1 != cx_ll_insert_array(list, index, element, 1);
584 }
585
586 static int cx_ll_remove(
587 struct cx_list_s *list,
588 size_t index
589 ) {
590 cx_linked_list *ll = (cx_linked_list *) list;
591 cx_linked_list_node *node = cx_ll_node_at(ll, index);
592
593 // out-of-bounds check
594 if (node == NULL) return 1;
595
596 // element destruction
597 cx_invoke_destructor(list, node->payload);
598
599 // remove
600 cx_linked_list_remove((void **) &ll->begin, (void **) &ll->end,
601 CX_LL_LOC_PREV, CX_LL_LOC_NEXT, node);
602
603 // adjust size
604 list->collection.size--;
605
606 // free and return
607 cxFree(list->collection.allocator, node);
608
609 return 0;
610 }
611
612 static void cx_ll_clear(struct cx_list_s *list) {
613 if (list->collection.size == 0) return;
614
615 cx_linked_list *ll = (cx_linked_list *) list;
616 cx_linked_list_node *node = ll->begin;
617 while (node != NULL) {
618 cx_invoke_destructor(list, node->payload);
619 cx_linked_list_node *next = node->next;
620 cxFree(list->collection.allocator, node);
621 node = next;
622 }
623 ll->begin = ll->end = NULL;
624 list->collection.size = 0;
625 }
626
627 #ifndef CX_LINKED_LIST_SWAP_SBO_SIZE
628 #define CX_LINKED_LIST_SWAP_SBO_SIZE 128
629 #endif
630 unsigned cx_linked_list_swap_sbo_size = CX_LINKED_LIST_SWAP_SBO_SIZE;
631
632 static int cx_ll_swap(
633 struct cx_list_s *list,
634 size_t i,
635 size_t j
636 ) {
637 if (i >= list->collection.size || j >= list->collection.size) return 1;
638 if (i == j) return 0;
639
640 // perform an optimized search that finds both elements in one run
641 cx_linked_list *ll = (cx_linked_list *) list;
642 size_t mid = list->collection.size / 2;
643 size_t left, right;
644 if (i < j) {
645 left = i;
646 right = j;
647 } else {
648 left = j;
649 right = i;
650 }
651 cx_linked_list_node *nleft, *nright;
652 if (left < mid && right < mid) {
653 // case 1: both items left from mid
654 nleft = cx_ll_node_at(ll, left);
655 assert(nleft != NULL);
656 nright = nleft;
657 for (size_t c = left; c < right; c++) {
658 nright = nright->next;
659 }
660 } else if (left >= mid && right >= mid) {
661 // case 2: both items right from mid
662 nright = cx_ll_node_at(ll, right);
663 assert(nright != NULL);
664 nleft = nright;
665 for (size_t c = right; c > left; c--) {
666 nleft = nleft->prev;
667 }
668 } else {
669 // case 3: one item left, one item right
670
671 // chose the closest to begin / end
672 size_t closest;
673 size_t other;
674 size_t diff2boundary = list->collection.size - right - 1;
675 if (left <= diff2boundary) {
676 closest = left;
677 other = right;
678 nleft = cx_ll_node_at(ll, left);
679 } else {
680 closest = right;
681 other = left;
682 diff2boundary = left;
683 nright = cx_ll_node_at(ll, right);
684 }
685
686 // is other element closer to us or closer to boundary?
687 if (right - left <= diff2boundary) {
688 // search other element starting from already found element
689 if (closest == left) {
690 nright = nleft;
691 for (size_t c = left; c < right; c++) {
692 nright = nright->next;
693 }
694 } else {
695 nleft = nright;
696 for (size_t c = right; c > left; c--) {
697 nleft = nleft->prev;
698 }
699 }
700 } else {
701 // search other element starting at the boundary
702 if (closest == left) {
703 nright = cx_ll_node_at(ll, other);
704 } else {
705 nleft = cx_ll_node_at(ll, other);
706 }
707 }
708 }
709
710 if (list->collection.elem_size > CX_LINKED_LIST_SWAP_SBO_SIZE) {
711 cx_linked_list_node *prev = nleft->prev;
712 cx_linked_list_node *next = nright->next;
713 cx_linked_list_node *midstart = nleft->next;
714 cx_linked_list_node *midend = nright->prev;
715
716 if (prev == NULL) {
717 ll->begin = nright;
718 } else {
719 prev->next = nright;
720 }
721 nright->prev = prev;
722 if (midstart == nright) {
723 // special case: both nodes are adjacent
724 nright->next = nleft;
725 nleft->prev = nright;
726 } else {
727 // likely case: a chain is between the two nodes
728 nright->next = midstart;
729 midstart->prev = nright;
730 midend->next = nleft;
731 nleft->prev = midend;
732 }
733 nleft->next = next;
734 if (next == NULL) {
735 ll->end = nleft;
736 } else {
737 next->prev = nleft;
738 }
739 } else {
740 // swap payloads to avoid relinking
741 char buf[CX_LINKED_LIST_SWAP_SBO_SIZE];
742 memcpy(buf, nleft->payload, list->collection.elem_size);
743 memcpy(nleft->payload, nright->payload, list->collection.elem_size);
744 memcpy(nright->payload, buf, list->collection.elem_size);
745 }
746
747 return 0;
748 }
749
750 static void *cx_ll_at(
751 struct cx_list_s const *list,
752 size_t index
753 ) {
754 cx_linked_list *ll = (cx_linked_list *) list;
755 cx_linked_list_node *node = cx_ll_node_at(ll, index);
756 return node == NULL ? NULL : node->payload;
757 }
758
759 static ssize_t cx_ll_find_remove(
760 struct cx_list_s *list,
761 void const *elem,
762 bool remove
763 ) {
764 if (remove) {
765 cx_linked_list *ll = ((cx_linked_list *) list);
766 cx_linked_list_node *node;
767 ssize_t index = cx_linked_list_find_node(
768 (void **) &node,
769 ll->begin,
770 CX_LL_LOC_NEXT, CX_LL_LOC_DATA,
771 list->collection.cmpfunc, elem
772 );
773 if (node != NULL) {
774 cx_invoke_destructor(list, node->payload);
775 cx_linked_list_remove((void **) &ll->begin, (void **) &ll->end,
776 CX_LL_LOC_PREV, CX_LL_LOC_NEXT, node);
777 list->collection.size--;
778 cxFree(list->collection.allocator, node);
779 }
780 return index;
781 } else {
782 return cx_linked_list_find(
783 ((cx_linked_list *) list)->begin,
784 CX_LL_LOC_NEXT, CX_LL_LOC_DATA,
785 list->collection.cmpfunc, elem
786 );
787 }
788 }
789
790 static void cx_ll_sort(struct cx_list_s *list) {
791 cx_linked_list *ll = (cx_linked_list *) list;
792 cx_linked_list_sort((void **) &ll->begin, (void **) &ll->end,
793 CX_LL_LOC_PREV, CX_LL_LOC_NEXT, CX_LL_LOC_DATA,
794 list->collection.cmpfunc);
795 }
796
797 static void cx_ll_reverse(struct cx_list_s *list) {
798 cx_linked_list *ll = (cx_linked_list *) list;
799 cx_linked_list_reverse((void **) &ll->begin, (void **) &ll->end, CX_LL_LOC_PREV, CX_LL_LOC_NEXT);
800 }
801
802 static int cx_ll_compare(
803 struct cx_list_s const *list,
804 struct cx_list_s const *other
805 ) {
806 cx_linked_list *left = (cx_linked_list *) list;
807 cx_linked_list *right = (cx_linked_list *) other;
808 return cx_linked_list_compare(left->begin, right->begin,
809 CX_LL_LOC_NEXT, CX_LL_LOC_DATA,
810 list->collection.cmpfunc);
811 }
812
813 static bool cx_ll_iter_valid(void const *it) {
814 struct cx_iterator_s const *iter = it;
815 return iter->elem_handle != NULL;
816 }
817
818 static void cx_ll_iter_next(void *it) {
819 struct cx_iterator_s *iter = it;
820 if (iter->base.remove) {
821 iter->base.remove = false;
822 struct cx_list_s *list = iter->src_handle.m;
823 cx_linked_list *ll = iter->src_handle.m;
824 cx_linked_list_node *node = iter->elem_handle;
825 iter->elem_handle = node->next;
826 cx_invoke_destructor(list, node->payload);
827 cx_linked_list_remove((void **) &ll->begin, (void **) &ll->end,
828 CX_LL_LOC_PREV, CX_LL_LOC_NEXT, node);
829 list->collection.size--;
830 cxFree(list->collection.allocator, node);
831 } else {
832 iter->index++;
833 cx_linked_list_node *node = iter->elem_handle;
834 iter->elem_handle = node->next;
835 }
836 }
837
838 static void cx_ll_iter_prev(void *it) {
839 struct cx_iterator_s *iter = it;
840 if (iter->base.remove) {
841 iter->base.remove = false;
842 struct cx_list_s *list = iter->src_handle.m;
843 cx_linked_list *ll = iter->src_handle.m;
844 cx_linked_list_node *node = iter->elem_handle;
845 iter->elem_handle = node->prev;
846 iter->index--;
847 cx_invoke_destructor(list, node->payload);
848 cx_linked_list_remove((void **) &ll->begin, (void **) &ll->end,
849 CX_LL_LOC_PREV, CX_LL_LOC_NEXT, node);
850 list->collection.size--;
851 cxFree(list->collection.allocator, node);
852 } else {
853 iter->index--;
854 cx_linked_list_node *node = iter->elem_handle;
855 iter->elem_handle = node->prev;
856 }
857 }
858
859 static void *cx_ll_iter_current(void const *it) {
860 struct cx_iterator_s const *iter = it;
861 cx_linked_list_node *node = iter->elem_handle;
862 return node->payload;
863 }
864
865 static CxIterator cx_ll_iterator(
866 struct cx_list_s const *list,
867 size_t index,
868 bool backwards
869 ) {
870 CxIterator iter;
871 iter.index = index;
872 iter.src_handle.c = list;
873 iter.elem_handle = cx_ll_node_at((cx_linked_list const *) list, index);
874 iter.elem_size = list->collection.elem_size;
875 iter.elem_count = list->collection.size;
876 iter.base.valid = cx_ll_iter_valid;
877 iter.base.current = cx_ll_iter_current;
878 iter.base.next = backwards ? cx_ll_iter_prev : cx_ll_iter_next;
879 iter.base.mutating = false;
880 iter.base.remove = false;
881 return iter;
882 }
883
884 static int cx_ll_insert_iter(
885 CxIterator *iter,
886 void const *elem,
887 int prepend
888 ) {
889 struct cx_list_s *list = iter->src_handle.m;
890 cx_linked_list_node *node = iter->elem_handle;
891 if (node != NULL) {
892 assert(prepend >= 0 && prepend <= 1);
893 cx_linked_list_node *choice[2] = {node, node->prev};
894 int result = cx_ll_insert_at(list, choice[prepend], elem);
895 iter->index += prepend * (0 == result);
896 return result;
897 } else {
898 int result = cx_ll_insert_element(list, list->collection.size, elem);
899 iter->index = list->collection.size;
900 return result;
901 }
902 }
903
904 static void cx_ll_destructor(CxList *list) {
905 cx_linked_list *ll = (cx_linked_list *) list;
906
907 cx_linked_list_node *node = ll->begin;
908 while (node) {
909 cx_invoke_destructor(list, node->payload);
910 void *next = node->next;
911 cxFree(list->collection.allocator, node);
912 node = next;
913 }
914
915 cxFree(list->collection.allocator, list);
916 }
917
918 static cx_list_class cx_linked_list_class = {
919 cx_ll_destructor,
920 cx_ll_insert_element,
921 cx_ll_insert_array,
922 cx_ll_insert_iter,
923 cx_ll_remove,
924 cx_ll_clear,
925 cx_ll_swap,
926 cx_ll_at,
927 cx_ll_find_remove,
928 cx_ll_sort,
929 cx_ll_compare,
930 cx_ll_reverse,
931 cx_ll_iterator,
932 };
933
934 CxList *cxLinkedListCreate(
935 CxAllocator const *allocator,
936 cx_compare_func comparator,
937 size_t elem_size
938 ) {
939 if (allocator == NULL) {
940 allocator = cxDefaultAllocator;
941 }
942
943 cx_linked_list *list = cxCalloc(allocator, 1, sizeof(cx_linked_list));
944 if (list == NULL) return NULL;
945
946 list->base.cl = &cx_linked_list_class;
947 list->base.collection.allocator = allocator;
948
949 if (elem_size > 0) {
950 list->base.collection.elem_size = elem_size;
951 list->base.collection.cmpfunc = comparator;
952 } else {
953 list->base.collection.cmpfunc = comparator == NULL ? cx_cmp_ptr : comparator;
954 cxListStorePointers((CxList *) list);
955 }
956
957 return (CxList *) list;
958 }
959