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_list_s *l = (struct cx_list_s *) list;
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_list_s *l = (struct cx_list_s *) list;
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_mut_iterator_s *iter,
84 void const *elem,
85 int prepend
86 ) {
87 struct cx_list_s *list = iter->src_handle;
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(
119 struct cx_list_s const *list,
120 void const *elem
121 ) {
122 cx_pl_hack_cmpfunc(list);
123 ssize_t ret = list->climpl->find(list, &elem);
124 cx_pl_unhack_cmpfunc(list);
125 return ret;
126 }
127
128 static void cx_pl_sort(struct cx_list_s *list) {
129 cx_pl_hack_cmpfunc(list);
130 list->climpl->sort(list);
131 cx_pl_unhack_cmpfunc(list);
132 }
133
134 static int cx_pl_compare(
135 struct cx_list_s const *list,
136 struct cx_list_s const *other
137 ) {
138 cx_pl_hack_cmpfunc(list);
139 int ret = list->climpl->compare(list, other);
140 cx_pl_unhack_cmpfunc(list);
141 return ret;
142 }
143
144 static void cx_pl_reverse(struct cx_list_s *list) {
145 list->climpl->reverse(list);
146 }
147
148 static void *cx_pl_iter_current(void const *it) {
149 struct cx_iterator_s const *iter = it;
150 void **ptr = iter->base.current_impl(it);
151 return ptr == NULL ? NULL : *ptr;
152 }
153
154 static struct cx_iterator_s cx_pl_iterator(
155 struct cx_list_s const *list,
156 size_t index,
157 bool backwards
158 ) {
159 struct cx_iterator_s iter = list->climpl->iterator(list, index, backwards);
160 iter.base.current_impl = iter.base.current;
161 iter.base.current = cx_pl_iter_current;
162 return iter;
163 }
164
165 static cx_list_class cx_pointer_list_class = {
166 cx_pl_destructor,
167 cx_pl_insert_element,
168 cx_pl_insert_array,
169 cx_pl_insert_iter,
170 cx_pl_remove,
171 cx_pl_clear,
172 cx_pl_swap,
173 cx_pl_at,
174 cx_pl_find,
175 cx_pl_sort,
176 cx_pl_compare,
177 cx_pl_reverse,
178 cx_pl_iterator,
179 };
180
181 void cxListStoreObjects(CxList *list) {
182 list->store_pointer = false;
183 if (list->climpl != NULL) {
184 list->cl = list->climpl;
185 list->climpl = NULL;
186 }
187 }
188
189 void cxListStorePointers(CxList *list) {
190 list->item_size = sizeof(void *);
191 list->store_pointer = true;
192 list->climpl = list->cl;
193 list->cl = &cx_pointer_list_class;
194 }
195
196 // </editor-fold>
197
198 // <editor-fold desc="empty list implementation">
199
200 static void cx_emptyl_noop(__attribute__((__unused__)) CxList *list) {
201 // this is a noop, but MUST be implemented
202 }
203
204 static void *cx_emptyl_at(
205 __attribute__((__unused__)) struct cx_list_s const *list,
206 __attribute__((__unused__)) size_t index
207 ) {
208 return NULL;
209 }
210
211 static ssize_t cx_emptyl_find(
212 __attribute__((__unused__)) struct cx_list_s const *list,
213 __attribute__((__unused__)) void const *elem
214 ) {
215 return -1;
216 }
217
218 static int cx_emptyl_compare(
219 __attribute__((__unused__)) struct cx_list_s const *list,
220 struct cx_list_s const *other
221 ) {
222 if (other->size == 0) return 0;
223 return -1;
224 }
225
226 static bool cx_emptyl_iter_valid(__attribute__((__unused__)) void const *iter) {
227 return false;
228 }
229
230 static CxIterator cx_emptyl_iterator(
231 struct cx_list_s const *list,
232 size_t index,
233 __attribute__((__unused__)) bool backwards
234 ) {
235 CxIterator iter = {0};
236 iter.src_handle = list;
237 iter.index = index;
238 iter.base.valid = cx_emptyl_iter_valid;
239 return iter;
240 }
241
242 static cx_list_class cx_empty_list_class = {
243 cx_emptyl_noop,
244 NULL,
245 NULL,
246 NULL,
247 NULL,
248 cx_emptyl_noop,
249 NULL,
250 cx_emptyl_at,
251 cx_emptyl_find,
252 cx_emptyl_noop,
253 cx_emptyl_compare,
254 cx_emptyl_noop,
255 cx_emptyl_iterator,
256 };
257
258 CxList cx_empty_list = {
259 NULL,
260 NULL,
261 0,
262 0,
263 NULL,
264 NULL,
265 NULL,
266 false,
267 &cx_empty_list_class,
268 NULL
269 };
270
271 CxList *const cxEmptyList = &cx_empty_list;
272
273 // </editor-fold>
274
275 void cxListDestroy(CxList *list) {
276 list->cl->destructor(list);
277 }
278
279 int cxListCompare(
280 CxList const *list,
281 CxList const *other
282 ) {
283 if (
284 // if one is storing pointers but the other is not
285 (list->store_pointer ^ other->store_pointer) ||
286
287 // if one class is wrapped but the other is not
288 ((list->climpl == NULL) ^ (other->climpl == NULL)) ||
289
290 // if the resolved compare functions are not the same
291 ((list->climpl != NULL ? list->climpl->compare : list->cl->compare) !=
292 (other->climpl != NULL ? other->climpl->compare : other->cl->compare))
293 ) {
294 // lists are definitely different - cannot use internal compare function
295 if (list->size == other->size) {
296 CxIterator left = cxListIterator(list);
297 CxIterator right = cxListIterator(other);
298 for (size_t i = 0; i < list->size; i++) {
299 void *leftValue = cxIteratorCurrent(left);
300 void *rightValue = cxIteratorCurrent(right);
301 int d = list->cmpfunc(leftValue, rightValue);
302 if (d != 0) {
303 return d;
304 }
305 cxIteratorNext(left);
306 cxIteratorNext(right);
307 }
308 return 0;
309 } else {
310 return list->size < other->size ? -1 : 1;
311 }
312 } else {
313 // lists are compatible
314 return list->cl->compare(list, other);
315 }
316 }
317
318 CxMutIterator cxListMutIteratorAt(
319 CxList *list,
320 size_t index
321 ) {
322 CxIterator it = list->cl->iterator(list, index, false);
323 it.base.mutating = true;
324
325 // we know the iterators share the same memory layout
326 CxMutIterator iter;
327 memcpy(&iter, &it, sizeof(CxMutIterator));
328 return iter;
329 }
330
331 CxMutIterator cxListMutBackwardsIteratorAt(
332 CxList *list,
333 size_t index
334 ) {
335 CxIterator it = list->cl->iterator(list, index, true);
336 it.base.mutating = true;
337
338 // we know the iterators share the same memory layout
339 CxMutIterator iter;
340 memcpy(&iter, &it, sizeof(CxMutIterator));
341 return iter;
342 }
343