Mercurial > code
annotate array.c @ 136:c6d9eb5702e8
array:
o add ARRAY_FASTREMOVE, use last object when removing,
o add ARRAY_CLEARBITS, set to 0 the bytes when removing
parray:
o add PARRAY_FASTREMOVE, use last object when removing,
o add PARRAY_NULLEND, always has a last NULL entry
| author | David Demelier <markand@malikania.fr> |
|---|---|
| date | Mon, 26 Mar 2012 10:24:49 +0200 |
| parents | 5917096facb9 |
| children | e3cf5ac9a5aa |
| rev | line source |
|---|---|
| 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 { |
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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; | |
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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 | |
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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 |
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58 */ |
| 62 | 59 |
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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)); |
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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); | |
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80 break; |
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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 | |
| 89 * using linked list instead. | |
| 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 | |
| 106 * allocation failure or when the index is outof bounds otherwise 0 is returned. | |
| 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 */ |
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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 |
| 122 return 0; | |
| 123 } | |
| 124 | |
| 125 /* | |
| 126 * Append the data to the end of array. | |
| 127 */ | |
| 128 | |
| 129 int | |
| 130 array_append(struct array *arr, const void *data) | |
| 131 { | |
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132 if (grow(arr) < 0) |
| 62 | 133 return -1; |
| 134 | |
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135 memcpy((char *)arr->data + OFFSET(arr->length++), data, arr->unit); |
| 62 | 136 |
| 137 return 0; | |
| 138 } | |
| 139 | |
| 140 /* | |
| 141 * Remove the array's head. | |
| 142 */ | |
| 143 | |
| 144 void | |
| 145 array_pop(struct array *arr) | |
| 146 { | |
| 136 | 147 array_iremove(arr, 0); |
| 62 | 148 } |
| 149 | |
| 150 /* | |
| 151 * Remove the array's tail. | |
| 152 */ | |
| 153 | |
| 154 void | |
| 155 array_unqueue(struct array *arr) | |
| 156 { | |
| 136 | 157 array_iremove(arr, arr->length - 1); |
| 62 | 158 } |
| 159 | |
| 160 /* | |
| 161 * Remove the data at the specified index. Bounds are checked. | |
| 162 */ | |
| 163 | |
| 164 void | |
| 119 | 165 array_iremove(struct array *arr, int index) |
| 62 | 166 { |
| 167 if (arr->length > 0 && index >= 0 && index < arr->length) { | |
| 136 | 168 if (arr->flags & ARRAY_FASTREMOVE) |
| 169 memmove((char *)arr->data + OFFSET(index), | |
| 170 (char *)arr->data + OFFSET(--arr->length), | |
| 171 arr->unit); | |
| 172 else | |
| 173 memmove((char *)arr->data + OFFSET(index), | |
| 174 (char *)arr->data + OFFSET(index + 1), | |
| 175 OFFSET(arr->length-- - index - 1)); | |
| 62 | 176 } |
| 136 | 177 |
| 178 if (arr->flags & ARRAY_CLEARBITS) | |
| 179 memset((char *)arr->data + OFFSET(arr->length), 0, arr->unit); | |
| 62 | 180 } |
| 181 | |
| 182 /* | |
| 183 * Remove the object referenced by the `data' argument. Useful when you | |
| 184 * don't know the index. | |
| 185 */ | |
| 186 | |
| 187 void | |
| 119 | 188 array_premove(struct array *arr, const void *data) |
| 62 | 189 { |
| 190 void *elm; | |
| 191 int i; | |
| 192 | |
| 193 for (i = 0; i < arr->length; ++i) { | |
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194 elm = (char *)arr->data + OFFSET(i); |
| 62 | 195 |
| 136 | 196 if (memcmp(elm, data, arr->unit) == 0) { |
| 123 | 197 array_iremove(arr, i); |
| 136 | 198 break; |
| 199 } | |
| 62 | 200 } |
| 201 } | |
| 202 | |
| 203 /* | |
| 204 * Swap the two elements referenced by index `i1' and `i2'. This function needs | |
| 205 * to allocate data to swap elements thus if the functions fails it returns -1 | |
| 206 * otherwise 0 is returned. | |
| 207 */ | |
| 208 | |
| 209 int | |
| 210 array_iswap(struct array *arr, int i1, int i2) | |
| 211 { | |
| 212 void *tmp; | |
| 213 | |
| 214 /* Out of bounds */ | |
| 215 if (i1 >= arr->length || i1 < 0 || i2 >= arr->length || i2 < 0) | |
| 216 return -1; | |
| 217 | |
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218 if ((tmp = arr->malloc(arr->unit)) == NULL) |
| 62 | 219 return -1; |
| 220 | |
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221 memcpy((char *)tmp, (char *)arr->data + OFFSET(i1), arr->unit); |
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222 memcpy((char *)arr->data + OFFSET(i1), (char *)arr->data + OFFSET(i2), |
| 62 | 223 arr->unit); |
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224 memcpy((char *)arr->data + OFFSET(i2), (char *)tmp, arr->unit); |
| 62 | 225 |
| 226 /* | |
| 227 * Clear bytes for safety you probably don't want a password or | |
| 228 * secure data to be left somewhere in the memory. | |
| 229 */ | |
| 230 | |
| 136 | 231 if (arr->flags & ARRAY_CLEARBITS) |
| 232 memset(tmp, 0, arr->unit); | |
| 62 | 233 free(tmp); |
| 234 | |
| 235 return 0; | |
| 236 } | |
| 237 | |
| 238 /* | |
| 239 * Swap the two elements referenced by data `o1' and `o2'. This function | |
| 240 * may be slow on large arrays since it must travel all the object | |
| 241 * to find the indexes. | |
| 242 */ | |
| 243 | |
| 244 int | |
| 245 array_pswap(struct array *arr, const void *o1, const void *o2) | |
| 246 { | |
| 247 int found, i1, i2; | |
| 248 | |
| 249 for (i1 = found = 0; !found && i1 < arr->length; ++i1) | |
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250 found = memcmp((char *)arr->data + OFFSET(i1), o1, arr->unit) == 0; |
| 62 | 251 |
| 252 if (!found) | |
| 253 return -1; | |
| 254 | |
| 255 for (i2 = found = 0; !found && i2 < arr->length; ++i2) | |
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256 found = memcmp((char *)arr->data + OFFSET(i2), o2, arr->unit) == 0; |
| 62 | 257 |
| 258 if (!found) | |
| 259 return -1; | |
| 260 | |
| 261 return array_iswap(arr, --i1, --i2); | |
| 262 } | |
| 263 | |
| 264 /* | |
| 265 * Apply the function `fn' on each object and give the optional `udata' | |
| 266 * argument to the function too. | |
| 267 */ | |
| 268 | |
| 269 void | |
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270 array_map(const struct array *arr, array_map_fn fn, void *udata) |
| 62 | 271 { |
| 272 int i; | |
| 273 | |
| 274 for (i = 0; i < arr->length; ++i) | |
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275 fn((char *)arr->data + OFFSET(i), udata); |
| 62 | 276 } |
| 277 | |
| 278 /* | |
| 279 * Compare each object with the user supplied function. If the `fn' function | |
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280 * returns 1, 1 is returned and dst points to the correct object, dst should |
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281 * be a pointer to a pointer of object, like (int **) for a array of int. |
| 62 | 282 */ |
| 283 | |
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284 int |
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285 array_find(const struct array *arr, array_cmp_fn fn, void *dst, void *u) |
| 62 | 286 { |
| 287 int st, i; | |
| 288 | |
| 120 | 289 for (i = st = 0; i < arr->length && st != 1; ++i) |
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290 st = fn((char *)arr->data + OFFSET(i), u); |
| 62 | 291 |
| 120 | 292 if (st && dst) |
| 293 *(char **)dst = (char *)arr->data + OFFSET(i - 1); | |
| 62 | 294 |
| 120 | 295 return (st) ? i - 1 : -1; |
| 62 | 296 } |
| 297 | |
| 136 | 298 void * |
| 299 array_first(const struct array *arr) | |
| 300 { | |
| 301 return arr->data; | |
| 302 } | |
| 303 | |
| 304 void * | |
| 305 array_last(const struct array *arr) | |
| 306 { | |
| 307 if (arr->length == 0) | |
| 308 return array_first(arr); | |
| 309 | |
| 310 return (char *)arr->data + OFFSET(arr->length - 1); | |
| 311 | |
| 312 } | |
| 313 | |
| 314 void * | |
| 315 array_index(const struct array *arr, int idx) | |
| 316 { | |
| 317 if (idx < 0) | |
| 318 return array_first(arr); | |
| 319 if (idx >= arr->length) | |
| 320 return array_last(arr); | |
| 321 | |
| 322 return (char *)arr->data + OFFSET(idx); | |
| 323 } | |
| 324 | |
| 62 | 325 /* |
| 326 * Erase every bytes and set the length to 0. | |
| 327 */ | |
| 328 | |
| 329 void | |
| 330 array_clear(struct array *arr) | |
| 331 { | |
| 136 | 332 if (arr->flags & ARRAY_CLEARBITS) |
| 333 memset(arr->data, 0, arr->size); | |
| 334 | |
| 62 | 335 arr->length = 0; |
| 336 } | |
| 337 | |
| 338 /* | |
| 339 * Same as array_clear except it also free the array object. | |
| 340 */ | |
| 341 | |
| 342 void | |
| 343 array_free(struct array *arr) | |
| 344 { | |
| 136 | 345 array_clear(arr); |
|
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346 free(arr->data); |
| 136 | 347 |
| 348 arr->data = NULL; | |
| 349 arr->size = 0; | |
| 62 | 350 } |
| 351 | |
| 352 /* | |
| 353 * Increate the array storage when it is full. If the buffer is fixed size | |
| 354 * it returns -1 on full buffer otherwise 0 is returned if allocation | |
| 355 * succeeded. | |
| 356 */ | |
| 357 | |
| 358 static int | |
|
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359 grow(struct array *arr) |
| 62 | 360 { |
| 136 | 361 if ((arr->size / arr->unit) > (size_t)arr->length) |
| 62 | 362 return 0; |
| 363 | |
| 136 | 364 if (!(arr->flags & ARRAY_FIXED)) { |
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365 if ((arr->data = arr->realloc(arr->data, arr->size + |
| 136 | 366 OFFSET(arr->bsize))) == NULL) { |
| 367 arr->size = arr->length = 0; | |
| 62 | 368 return -1; |
| 136 | 369 } |
| 62 | 370 |
| 371 arr->size += OFFSET(arr->bsize); | |
| 372 } else | |
| 373 return -1; | |
| 374 | |
| 375 return 0; | |
| 376 } |