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comparison: ucx/list.c

ucx/list.c

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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/list.h"
30
31 #include <string.h>
32
33 // <editor-fold desc="Store Pointers Functionality">
34
35 static _Thread_local cx_compare_func cx_pl_cmpfunc_impl;
36
37 static int cx_pl_cmpfunc(
38 void const *l,
39 void const *r
40 ) {
41 void *const *lptr = l;
42 void *const *rptr = r;
43 void const *left = lptr == NULL ? NULL : *lptr;
44 void const *right = rptr == NULL ? NULL : *rptr;
45 return cx_pl_cmpfunc_impl(left, right);
46 }
47
48 static void cx_pl_hack_cmpfunc(struct cx_list_s const *list) {
49 // cast away const - this is the hacky thing
50 struct cx_collection_s *l = (struct cx_collection_s*) &list->collection;
51 cx_pl_cmpfunc_impl = l->cmpfunc;
52 l->cmpfunc = cx_pl_cmpfunc;
53 }
54
55 static void cx_pl_unhack_cmpfunc(struct cx_list_s const *list) {
56 // cast away const - this is the hacky thing
57 struct cx_collection_s *l = (struct cx_collection_s*) &list->collection;
58 l->cmpfunc = cx_pl_cmpfunc_impl;
59 }
60
61 static void cx_pl_destructor(struct cx_list_s *list) {
62 list->climpl->destructor(list);
63 }
64
65 static int cx_pl_insert_element(
66 struct cx_list_s *list,
67 size_t index,
68 void const *element
69 ) {
70 return list->climpl->insert_element(list, index, &element);
71 }
72
73 static size_t cx_pl_insert_array(
74 struct cx_list_s *list,
75 size_t index,
76 void const *array,
77 size_t n
78 ) {
79 return list->climpl->insert_array(list, index, array, n);
80 }
81
82 static int cx_pl_insert_iter(
83 struct cx_iterator_s *iter,
84 void const *elem,
85 int prepend
86 ) {
87 struct cx_list_s *list = iter->src_handle.m;
88 return list->climpl->insert_iter(iter, &elem, prepend);
89 }
90
91 static int cx_pl_remove(
92 struct cx_list_s *list,
93 size_t index
94 ) {
95 return list->climpl->remove(list, index);
96 }
97
98 static void cx_pl_clear(struct cx_list_s *list) {
99 list->climpl->clear(list);
100 }
101
102 static int cx_pl_swap(
103 struct cx_list_s *list,
104 size_t i,
105 size_t j
106 ) {
107 return list->climpl->swap(list, i, j);
108 }
109
110 static void *cx_pl_at(
111 struct cx_list_s const *list,
112 size_t index
113 ) {
114 void **ptr = list->climpl->at(list, index);
115 return ptr == NULL ? NULL : *ptr;
116 }
117
118 static ssize_t cx_pl_find_remove(
119 struct cx_list_s *list,
120 void const *elem,
121 bool remove
122 ) {
123 cx_pl_hack_cmpfunc(list);
124 ssize_t ret = list->climpl->find_remove(list, &elem, remove);
125 cx_pl_unhack_cmpfunc(list);
126 return ret;
127 }
128
129 static void cx_pl_sort(struct cx_list_s *list) {
130 cx_pl_hack_cmpfunc(list);
131 list->climpl->sort(list);
132 cx_pl_unhack_cmpfunc(list);
133 }
134
135 static int cx_pl_compare(
136 struct cx_list_s const *list,
137 struct cx_list_s const *other
138 ) {
139 cx_pl_hack_cmpfunc(list);
140 int ret = list->climpl->compare(list, other);
141 cx_pl_unhack_cmpfunc(list);
142 return ret;
143 }
144
145 static void cx_pl_reverse(struct cx_list_s *list) {
146 list->climpl->reverse(list);
147 }
148
149 static void *cx_pl_iter_current(void const *it) {
150 struct cx_iterator_s const *iter = it;
151 void **ptr = iter->base.current_impl(it);
152 return ptr == NULL ? NULL : *ptr;
153 }
154
155 static struct cx_iterator_s cx_pl_iterator(
156 struct cx_list_s const *list,
157 size_t index,
158 bool backwards
159 ) {
160 struct cx_iterator_s iter = list->climpl->iterator(list, index, backwards);
161 iter.base.current_impl = iter.base.current;
162 iter.base.current = cx_pl_iter_current;
163 return iter;
164 }
165
166 static cx_list_class cx_pointer_list_class = {
167 cx_pl_destructor,
168 cx_pl_insert_element,
169 cx_pl_insert_array,
170 cx_pl_insert_iter,
171 cx_pl_remove,
172 cx_pl_clear,
173 cx_pl_swap,
174 cx_pl_at,
175 cx_pl_find_remove,
176 cx_pl_sort,
177 cx_pl_compare,
178 cx_pl_reverse,
179 cx_pl_iterator,
180 };
181
182 void cxListStoreObjects(CxList *list) {
183 list->collection.store_pointer = false;
184 if (list->climpl != NULL) {
185 list->cl = list->climpl;
186 list->climpl = NULL;
187 }
188 }
189
190 void cxListStorePointers(CxList *list) {
191 list->collection.elem_size = sizeof(void *);
192 list->collection.store_pointer = true;
193 list->climpl = list->cl;
194 list->cl = &cx_pointer_list_class;
195 }
196
197 // </editor-fold>
198
199 // <editor-fold desc="empty list implementation">
200
201 static void cx_emptyl_noop(__attribute__((__unused__)) CxList *list) {
202 // this is a noop, but MUST be implemented
203 }
204
205 static void *cx_emptyl_at(
206 __attribute__((__unused__)) struct cx_list_s const *list,
207 __attribute__((__unused__)) size_t index
208 ) {
209 return NULL;
210 }
211
212 static ssize_t cx_emptyl_find_remove(
213 __attribute__((__unused__)) struct cx_list_s *list,
214 __attribute__((__unused__)) void const *elem,
215 __attribute__((__unused__)) bool remove
216 ) {
217 return -1;
218 }
219
220 static int cx_emptyl_compare(
221 __attribute__((__unused__)) struct cx_list_s const *list,
222 struct cx_list_s const *other
223 ) {
224 if (other->collection.size == 0) return 0;
225 return -1;
226 }
227
228 static bool cx_emptyl_iter_valid(__attribute__((__unused__)) void const *iter) {
229 return false;
230 }
231
232 static CxIterator cx_emptyl_iterator(
233 struct cx_list_s const *list,
234 size_t index,
235 __attribute__((__unused__)) bool backwards
236 ) {
237 CxIterator iter = {0};
238 iter.src_handle.c = list;
239 iter.index = index;
240 iter.base.valid = cx_emptyl_iter_valid;
241 return iter;
242 }
243
244 static cx_list_class cx_empty_list_class = {
245 cx_emptyl_noop,
246 NULL,
247 NULL,
248 NULL,
249 NULL,
250 cx_emptyl_noop,
251 NULL,
252 cx_emptyl_at,
253 cx_emptyl_find_remove,
254 cx_emptyl_noop,
255 cx_emptyl_compare,
256 cx_emptyl_noop,
257 cx_emptyl_iterator,
258 };
259
260 CxList cx_empty_list = {
261 {
262 NULL,
263 NULL,
264 0,
265 0,
266 NULL,
267 NULL,
268 NULL,
269 false
270 },
271 &cx_empty_list_class,
272 NULL
273 };
274
275 CxList *const cxEmptyList = &cx_empty_list;
276
277 // </editor-fold>
278
279 void cxListDestroy(CxList *list) {
280 list->cl->destructor(list);
281 }
282
283 int cxListCompare(
284 CxList const *list,
285 CxList const *other
286 ) {
287 if (
288 // if one is storing pointers but the other is not
289 (list->collection.store_pointer ^ other->collection.store_pointer) ||
290
291 // if one class is wrapped but the other is not
292 ((list->climpl == NULL) ^ (other->climpl == NULL)) ||
293
294 // if the resolved compare functions are not the same
295 ((list->climpl != NULL ? list->climpl->compare : list->cl->compare) !=
296 (other->climpl != NULL ? other->climpl->compare : other->cl->compare))
297 ) {
298 // lists are definitely different - cannot use internal compare function
299 if (list->collection.size == other->collection.size) {
300 CxIterator left = list->cl->iterator(list, 0, false);
301 CxIterator right = other->cl->iterator(other, 0, false);
302 for (size_t i = 0; i < list->collection.size; i++) {
303 void *leftValue = cxIteratorCurrent(left);
304 void *rightValue = cxIteratorCurrent(right);
305 int d = list->collection.cmpfunc(leftValue, rightValue);
306 if (d != 0) {
307 return d;
308 }
309 cxIteratorNext(left);
310 cxIteratorNext(right);
311 }
312 return 0;
313 } else {
314 return list->collection.size < other->collection.size ? -1 : 1;
315 }
316 } else {
317 // lists are compatible
318 return list->cl->compare(list, other);
319 }
320 }
321
322 CxIterator cxListMutIteratorAt(
323 CxList *list,
324 size_t index
325 ) {
326 CxIterator it = list->cl->iterator(list, index, false);
327 it.base.mutating = true;
328 return it;
329 }
330
331 CxIterator cxListMutBackwardsIteratorAt(
332 CxList *list,
333 size_t index
334 ) {
335 CxIterator it = list->cl->iterator(list, index, true);
336 it.base.mutating = true;
337 return it;
338 }

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