Mercurial > code
annotate array.c @ 142:e3cf5ac9a5aa
[p]array_insert now returns -1 or index of added element
author | David Demelier <markand@malikania.fr> |
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date | Tue, 08 May 2012 15:02:17 +0200 |
parents | c6d9eb5702e8 |
children | 535f12e0a5af |
rev | line source |
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62 | 1 /* |
2 * array.c -- manipulate dynamic arrays | |
3 * | |
98 | 4 * Copyright (c) 2011, 2012, David Demelier <markand@malikania.fr> |
62 | 5 * |
6 * Permission to use, copy, modify, and/or distribute this software for any | |
7 * purpose with or without fee is hereby granted, provided that the above | |
8 * copyright notice and this permission notice appear in all copies. | |
9 * | |
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 */ | |
18 | |
19 #include <stdio.h> | |
20 #include <stdlib.h> | |
21 #include <string.h> | |
22 | |
23 #include "array.h" | |
24 | |
25 #define OFFSET(x) (arr->unit * (x)) | |
26 | |
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27 static int grow(struct array *); |
62 | 28 |
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29 int |
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30 array_init(struct array *arr, size_t unit) |
62 | 31 { |
91
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32 if (unit == 0) |
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33 return -1; |
62 | 34 |
35 arr->unit = unit; | |
36 arr->size = OFFSET(arr->bsize); | |
37 | |
92 | 38 /* Set defaults if needed */ |
39 arr->bsize = (arr->bsize <= 0) ? ARRAY_DEFAULT_BSIZE : arr->bsize; | |
91
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40 arr->malloc = (arr->malloc == NULL) ? &malloc : arr->malloc; |
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41 arr->realloc = (arr->realloc == NULL) ? &realloc : arr->realloc; |
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42 |
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43 if ((arr->data = arr->malloc(arr->size)) == NULL) |
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44 return -1; |
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45 |
136 | 46 if (arr->flags & ARRAY_CLEARBITS) |
47 memset(arr->data, 0, arr->size); | |
48 | |
91
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49 return 0; |
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50 } |
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51 |
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52 /* |
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53 * Valid options that can be set for an array : |
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54 * l -> optional array block size of type int |
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55 * m -> malloc function that must matches void * (*malloc)(size_t) |
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56 * r -> realloc function that must matches void * (*realloc)(void *, size_t) |
136 | 57 * f -> array flags of type int |
91
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58 */ |
62 | 59 |
91
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60 void |
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61 array_set(struct array *arr, const char *fmt, ...) |
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62 { |
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63 va_list ap; |
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64 const char *p; |
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65 |
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66 va_start(ap, fmt); |
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67 for (p = fmt; *p != '\0'; ++p) |
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68 switch (*p) { |
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69 case 'l': |
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70 arr->bsize = va_arg(ap, int); |
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71 break; |
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72 case 'm': |
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73 arr->malloc = va_arg(ap, void *(*)(size_t)); |
91
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74 break; |
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75 case 'r': |
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76 arr->realloc = va_arg(ap, void *(*)(void *, size_t)); |
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77 break; |
136 | 78 case 'f': |
79 arr->flags = va_arg(ap, int); | |
99
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80 break; |
91
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81 default: |
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82 break; |
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83 } |
62 | 84 } |
85 | |
86 /* | |
87 * Add to the head of array. NOTE: this may be very slow when adding a lot | |
88 * of object (about 100000). If you need to add a lot of data please consider | |
142
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89 * using linked list instead. Returns -1 on failure or 0 on success. |
62 | 90 */ |
91 | |
92 int | |
93 array_push(struct array *arr, const void *data) | |
94 { | |
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95 if (grow(arr) < 0) |
62 | 96 return -1; |
97 | |
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98 memmove((char *)arr->data + arr->unit, arr->data, OFFSET(arr->length++)); |
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99 memcpy((char *)arr->data, data, arr->unit); |
62 | 100 |
101 return 0; | |
102 } | |
103 | |
104 /* | |
105 * Insert the data at the specified index. The function returns -1 on | |
142
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106 * allocation failure or the position of the added element. |
62 | 107 */ |
108 | |
109 int | |
110 array_insert(struct array *arr, const void *data, int index) | |
111 { | |
118 | 112 if (index < 0) |
113 return array_push(arr, data); | |
114 if (index >= arr->length) | |
115 return array_append(arr, data); | |
62 | 116 |
118 | 117 /* Good place */ |
64
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118 memmove((char *)arr->data + OFFSET(index + 1), |
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119 (char *)arr->data + OFFSET(index), OFFSET(arr->length++ - index)); |
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120 memcpy((char *)arr->data + OFFSET(index), data, arr->unit); |
62 | 121 |
142
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122 return index; |
62 | 123 } |
124 | |
125 /* | |
142
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126 * Append the data to the end of array. Returns -1 on failure or the position |
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127 * of the added element. |
62 | 128 */ |
129 | |
130 int | |
131 array_append(struct array *arr, const void *data) | |
132 { | |
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133 if (grow(arr) < 0) |
62 | 134 return -1; |
135 | |
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136 memcpy((char *)arr->data + OFFSET(arr->length++), data, arr->unit); |
62 | 137 |
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138 return (arr->length - 1); |
62 | 139 } |
140 | |
141 /* | |
142 * Remove the array's head. | |
143 */ | |
144 | |
145 void | |
146 array_pop(struct array *arr) | |
147 { | |
136 | 148 array_iremove(arr, 0); |
62 | 149 } |
150 | |
151 /* | |
152 * Remove the array's tail. | |
153 */ | |
154 | |
155 void | |
156 array_unqueue(struct array *arr) | |
157 { | |
136 | 158 array_iremove(arr, arr->length - 1); |
62 | 159 } |
160 | |
161 /* | |
162 * Remove the data at the specified index. Bounds are checked. | |
163 */ | |
164 | |
165 void | |
119 | 166 array_iremove(struct array *arr, int index) |
62 | 167 { |
168 if (arr->length > 0 && index >= 0 && index < arr->length) { | |
136 | 169 if (arr->flags & ARRAY_FASTREMOVE) |
170 memmove((char *)arr->data + OFFSET(index), | |
171 (char *)arr->data + OFFSET(--arr->length), | |
172 arr->unit); | |
173 else | |
174 memmove((char *)arr->data + OFFSET(index), | |
175 (char *)arr->data + OFFSET(index + 1), | |
176 OFFSET(arr->length-- - index - 1)); | |
62 | 177 } |
136 | 178 |
179 if (arr->flags & ARRAY_CLEARBITS) | |
180 memset((char *)arr->data + OFFSET(arr->length), 0, arr->unit); | |
62 | 181 } |
182 | |
183 /* | |
184 * Remove the object referenced by the `data' argument. Useful when you | |
185 * don't know the index. | |
186 */ | |
187 | |
188 void | |
119 | 189 array_premove(struct array *arr, const void *data) |
62 | 190 { |
191 void *elm; | |
192 int i; | |
193 | |
194 for (i = 0; i < arr->length; ++i) { | |
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195 elm = (char *)arr->data + OFFSET(i); |
62 | 196 |
136 | 197 if (memcmp(elm, data, arr->unit) == 0) { |
123 | 198 array_iremove(arr, i); |
136 | 199 break; |
200 } | |
62 | 201 } |
202 } | |
203 | |
204 /* | |
205 * Swap the two elements referenced by index `i1' and `i2'. This function needs | |
206 * to allocate data to swap elements thus if the functions fails it returns -1 | |
207 * otherwise 0 is returned. | |
208 */ | |
209 | |
210 int | |
211 array_iswap(struct array *arr, int i1, int i2) | |
212 { | |
213 void *tmp; | |
214 | |
215 /* Out of bounds */ | |
216 if (i1 >= arr->length || i1 < 0 || i2 >= arr->length || i2 < 0) | |
217 return -1; | |
218 | |
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219 if ((tmp = arr->malloc(arr->unit)) == NULL) |
62 | 220 return -1; |
221 | |
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222 memcpy((char *)tmp, (char *)arr->data + OFFSET(i1), arr->unit); |
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223 memcpy((char *)arr->data + OFFSET(i1), (char *)arr->data + OFFSET(i2), |
62 | 224 arr->unit); |
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225 memcpy((char *)arr->data + OFFSET(i2), (char *)tmp, arr->unit); |
62 | 226 |
227 /* | |
228 * Clear bytes for safety you probably don't want a password or | |
229 * secure data to be left somewhere in the memory. | |
230 */ | |
231 | |
136 | 232 if (arr->flags & ARRAY_CLEARBITS) |
233 memset(tmp, 0, arr->unit); | |
62 | 234 free(tmp); |
235 | |
236 return 0; | |
237 } | |
238 | |
239 /* | |
240 * Swap the two elements referenced by data `o1' and `o2'. This function | |
241 * may be slow on large arrays since it must travel all the object | |
242 * to find the indexes. | |
243 */ | |
244 | |
245 int | |
246 array_pswap(struct array *arr, const void *o1, const void *o2) | |
247 { | |
248 int found, i1, i2; | |
249 | |
250 for (i1 = found = 0; !found && i1 < arr->length; ++i1) | |
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251 found = memcmp((char *)arr->data + OFFSET(i1), o1, arr->unit) == 0; |
62 | 252 |
253 if (!found) | |
254 return -1; | |
255 | |
256 for (i2 = found = 0; !found && i2 < arr->length; ++i2) | |
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257 found = memcmp((char *)arr->data + OFFSET(i2), o2, arr->unit) == 0; |
62 | 258 |
259 if (!found) | |
260 return -1; | |
261 | |
262 return array_iswap(arr, --i1, --i2); | |
263 } | |
264 | |
265 /* | |
266 * Apply the function `fn' on each object and give the optional `udata' | |
267 * argument to the function too. | |
268 */ | |
269 | |
270 void | |
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271 array_map(const struct array *arr, array_map_t fn, void *udata) |
62 | 272 { |
273 int i; | |
274 | |
275 for (i = 0; i < arr->length; ++i) | |
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276 fn((char *)arr->data + OFFSET(i), udata); |
62 | 277 } |
278 | |
279 /* | |
280 * Compare each object with the user supplied function. If the `fn' function | |
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281 * returns 1, 1 is returned and dst points to the correct object, dst should |
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282 * be a pointer to a pointer of object, like (int **) for a array of int. |
62 | 283 */ |
284 | |
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285 int |
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286 array_find(const struct array *arr, array_cmp_t fn, void *dst, void *u) |
62 | 287 { |
288 int st, i; | |
289 | |
120 | 290 for (i = st = 0; i < arr->length && st != 1; ++i) |
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291 st = fn((char *)arr->data + OFFSET(i), u); |
62 | 292 |
120 | 293 if (st && dst) |
294 *(char **)dst = (char *)arr->data + OFFSET(i - 1); | |
62 | 295 |
120 | 296 return (st) ? i - 1 : -1; |
62 | 297 } |
298 | |
136 | 299 void * |
300 array_first(const struct array *arr) | |
301 { | |
302 return arr->data; | |
303 } | |
304 | |
305 void * | |
306 array_last(const struct array *arr) | |
307 { | |
308 if (arr->length == 0) | |
309 return array_first(arr); | |
310 | |
311 return (char *)arr->data + OFFSET(arr->length - 1); | |
312 | |
313 } | |
314 | |
315 void * | |
316 array_index(const struct array *arr, int idx) | |
317 { | |
318 if (idx < 0) | |
319 return array_first(arr); | |
320 if (idx >= arr->length) | |
321 return array_last(arr); | |
322 | |
323 return (char *)arr->data + OFFSET(idx); | |
324 } | |
325 | |
62 | 326 /* |
327 * Erase every bytes and set the length to 0. | |
328 */ | |
329 | |
330 void | |
331 array_clear(struct array *arr) | |
332 { | |
136 | 333 if (arr->flags & ARRAY_CLEARBITS) |
334 memset(arr->data, 0, arr->size); | |
335 | |
62 | 336 arr->length = 0; |
337 } | |
338 | |
339 /* | |
340 * Same as array_clear except it also free the array object. | |
341 */ | |
342 | |
343 void | |
344 array_free(struct array *arr) | |
345 { | |
136 | 346 array_clear(arr); |
109
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347 free(arr->data); |
136 | 348 |
349 arr->data = NULL; | |
350 arr->size = 0; | |
62 | 351 } |
352 | |
353 /* | |
354 * Increate the array storage when it is full. If the buffer is fixed size | |
355 * it returns -1 on full buffer otherwise 0 is returned if allocation | |
356 * succeeded. | |
357 */ | |
358 | |
359 static int | |
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360 grow(struct array *arr) |
62 | 361 { |
136 | 362 if ((arr->size / arr->unit) > (size_t)arr->length) |
62 | 363 return 0; |
364 | |
136 | 365 if (!(arr->flags & ARRAY_FIXED)) { |
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David Demelier <markand@malikania.fr>
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366 if ((arr->data = arr->realloc(arr->data, arr->size + |
136 | 367 OFFSET(arr->bsize))) == NULL) { |
368 arr->size = arr->length = 0; | |
62 | 369 return -1; |
136 | 370 } |
62 | 371 |
372 arr->size += OFFSET(arr->bsize); | |
373 } else | |
374 return -1; | |
375 | |
376 return 0; | |
377 } |