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Commit | Line | Data |
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ef416fc2 | 1 | /* |
f2d18633 | 2 | * "$Id$" |
ef416fc2 | 3 | * |
71e16022 | 4 | * Sorted array routines for CUPS. |
ef416fc2 | 5 | * |
f3c17241 | 6 | * Copyright 2007-2012 by Apple Inc. |
b94498cf | 7 | * Copyright 1997-2007 by Easy Software Products. |
ef416fc2 | 8 | * |
9 | * These coded instructions, statements, and computer programs are the | |
bc44d920 | 10 | * property of Apple Inc. and are protected by Federal copyright |
11 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
12 | * which should have been included with this file. If this file is | |
13 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
ef416fc2 | 14 | * |
15 | * This file is subject to the Apple OS-Developed Software exception. | |
16 | * | |
17 | * Contents: | |
18 | * | |
eac3a0a0 MS |
19 | * cupsArrayAdd() - Add an element to the array. |
20 | * _cupsArrayAddStrings() - Add zero or more comma-delimited strings to an | |
21 | * array. | |
22 | * cupsArrayClear() - Clear the array. | |
23 | * cupsArrayCount() - Get the number of elements in the array. | |
24 | * cupsArrayCurrent() - Return the current element in the array. | |
25 | * cupsArrayDelete() - Free all memory used by the array. | |
26 | * cupsArrayDup() - Duplicate the array. | |
27 | * cupsArrayFind() - Find an element in the array. | |
28 | * cupsArrayFirst() - Get the first element in the array. | |
29 | * cupsArrayGetIndex() - Get the index of the current element. | |
30 | * cupsArrayGetInsert() - Get the index of the last inserted element. | |
31 | * cupsArrayIndex() - Get the N-th element in the array. | |
32 | * cupsArrayInsert() - Insert an element in the array. | |
33 | * cupsArrayLast() - Get the last element in the array. | |
34 | * cupsArrayNew() - Create a new array. | |
35 | * cupsArrayNew2() - Create a new array with hash. | |
36 | * cupsArrayNew3() - Create a new array with hash and/or free function. | |
37 | * _cupsArrayNewStrings() - Create a new array of comma-delimited strings. | |
38 | * cupsArrayNext() - Get the next element in the array. | |
39 | * cupsArrayPrev() - Get the previous element in the array. | |
40 | * cupsArrayRemove() - Remove an element from the array. | |
41 | * cupsArrayRestore() - Reset the current element to the last @link | |
42 | * cupsArraySave@. | |
43 | * cupsArraySave() - Mark the current element for a later @link | |
44 | * cupsArrayRestore@. | |
45 | * cupsArrayUserData() - Return the user data for an array. | |
46 | * cups_array_add() - Insert or append an element to the array. | |
47 | * cups_array_find() - Find an element in the array. | |
ef416fc2 | 48 | */ |
49 | ||
50 | /* | |
51 | * Include necessary headers... | |
52 | */ | |
53 | ||
71e16022 MS |
54 | #include "string-private.h" |
55 | #include "debug-private.h" | |
eac3a0a0 | 56 | #include "array-private.h" |
ef416fc2 | 57 | |
58 | ||
59 | /* | |
60 | * Limits... | |
61 | */ | |
62 | ||
63 | #define _CUPS_MAXSAVE 32 /**** Maximum number of saves ****/ | |
64 | ||
65 | ||
66 | /* | |
67 | * Types and structures... | |
68 | */ | |
69 | ||
70 | struct _cups_array_s /**** CUPS array structure ****/ | |
71 | { | |
72 | /* | |
73 | * The current implementation uses an insertion sort into an array of | |
74 | * sorted pointers. We leave the array type private/opaque so that we | |
75 | * can change the underlying implementation without affecting the users | |
76 | * of this API. | |
77 | */ | |
78 | ||
79 | int num_elements, /* Number of array elements */ | |
80 | alloc_elements, /* Allocated array elements */ | |
81 | current, /* Current element */ | |
82 | insert, /* Last inserted element */ | |
bd7854cb | 83 | unique, /* Are all elements unique? */ |
ef416fc2 | 84 | num_saved, /* Number of saved elements */ |
85 | saved[_CUPS_MAXSAVE]; | |
86 | /* Saved elements */ | |
87 | void **elements; /* Array elements */ | |
88 | cups_array_func_t compare; /* Element comparison function */ | |
89 | void *data; /* User data passed to compare */ | |
b94498cf | 90 | cups_ahash_func_t hashfunc; /* Hash function */ |
91 | int hashsize, /* Size of hash */ | |
92 | *hash; /* Hash array */ | |
10d09e33 MS |
93 | cups_acopy_func_t copyfunc; /* Copy function */ |
94 | cups_afree_func_t freefunc; /* Free function */ | |
ef416fc2 | 95 | }; |
96 | ||
97 | ||
98 | /* | |
99 | * Local functions... | |
100 | */ | |
101 | ||
bd7854cb | 102 | static int cups_array_add(cups_array_t *a, void *e, int insert); |
103 | static int cups_array_find(cups_array_t *a, void *e, int prev, int *rdiff); | |
ef416fc2 | 104 | |
105 | ||
106 | /* | |
107 | * 'cupsArrayAdd()' - Add an element to the array. | |
bd7854cb | 108 | * |
109 | * When adding an element to a sorted array, non-unique elements are | |
79e1d494 MS |
110 | * appended at the end of the run of identical elements. For unsorted arrays, |
111 | * the element is appended to the end of the array. | |
5a738aea | 112 | * |
f3c17241 | 113 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 114 | */ |
115 | ||
116 | int /* O - 1 on success, 0 on failure */ | |
117 | cupsArrayAdd(cups_array_t *a, /* I - Array */ | |
118 | void *e) /* I - Element */ | |
119 | { | |
e07d4801 | 120 | DEBUG_printf(("2cupsArrayAdd(a=%p, e=%p)", a, e)); |
ef416fc2 | 121 | |
122 | /* | |
123 | * Range check input... | |
124 | */ | |
125 | ||
126 | if (!a || !e) | |
127 | { | |
e07d4801 | 128 | DEBUG_puts("3cupsArrayAdd: returning 0"); |
ef416fc2 | 129 | return (0); |
130 | } | |
131 | ||
132 | /* | |
bd7854cb | 133 | * Append the element... |
ef416fc2 | 134 | */ |
135 | ||
bd7854cb | 136 | return (cups_array_add(a, e, 0)); |
ef416fc2 | 137 | } |
138 | ||
139 | ||
eac3a0a0 | 140 | /* |
5a9febac | 141 | * '_cupsArrayAddStrings()' - Add zero or more delimited strings to an array. |
eac3a0a0 MS |
142 | * |
143 | * Note: The array MUST be created using the @link _cupsArrayNewStrings@ | |
144 | * function. Duplicate strings are NOT added. If the string pointer "s" is NULL | |
145 | * or the empty string, no strings are added to the array. | |
146 | */ | |
147 | ||
148 | int /* O - 1 on success, 0 on failure */ | |
149 | _cupsArrayAddStrings(cups_array_t *a, /* I - Array */ | |
5a9febac MS |
150 | const char *s, /* I - Delimited strings or NULL */ |
151 | char delim)/* I - Delimiter character */ | |
eac3a0a0 MS |
152 | { |
153 | char *buffer, /* Copy of string */ | |
154 | *start, /* Start of string */ | |
155 | *end; /* End of string */ | |
156 | int status = 1; /* Status of add */ | |
157 | ||
158 | ||
a469f8a5 MS |
159 | DEBUG_printf(("_cupsArrayAddStrings(a=%p, s=\"%s\", delim='%c')", a, s, |
160 | delim)); | |
161 | ||
eac3a0a0 | 162 | if (!a || !s || !*s) |
a469f8a5 MS |
163 | { |
164 | DEBUG_puts("1_cupsArrayAddStrings: Returning 0"); | |
eac3a0a0 | 165 | return (0); |
a469f8a5 | 166 | } |
eac3a0a0 | 167 | |
5a9febac MS |
168 | if (delim == ' ') |
169 | { | |
170 | /* | |
171 | * Skip leading whitespace... | |
172 | */ | |
173 | ||
a469f8a5 MS |
174 | DEBUG_puts("1_cupsArrayAddStrings: Skipping leading whitespace."); |
175 | ||
5a9febac MS |
176 | while (*s && isspace(*s & 255)) |
177 | s ++; | |
a469f8a5 MS |
178 | |
179 | DEBUG_printf(("1_cupsArrayAddStrings: Remaining string \"%s\".", s)); | |
5a9febac MS |
180 | } |
181 | ||
a469f8a5 MS |
182 | if (!strchr(s, delim) && |
183 | (delim != ' ' || (!strchr(s, '\t') && !strchr(s, '\n')))) | |
eac3a0a0 MS |
184 | { |
185 | /* | |
5a9febac | 186 | * String doesn't contain a delimiter, so add it as a single value... |
eac3a0a0 MS |
187 | */ |
188 | ||
a469f8a5 MS |
189 | DEBUG_puts("1_cupsArrayAddStrings: No delimiter seen, adding a single " |
190 | "value."); | |
191 | ||
eac3a0a0 MS |
192 | if (!cupsArrayFind(a, (void *)s)) |
193 | status = cupsArrayAdd(a, (void *)s); | |
194 | } | |
195 | else if ((buffer = strdup(s)) == NULL) | |
a469f8a5 MS |
196 | { |
197 | DEBUG_puts("1_cupsArrayAddStrings: Unable to duplicate string."); | |
eac3a0a0 | 198 | status = 0; |
a469f8a5 | 199 | } |
eac3a0a0 MS |
200 | else |
201 | { | |
202 | for (start = end = buffer; *end; start = end) | |
203 | { | |
204 | /* | |
205 | * Find the end of the current delimited string and see if we need to add | |
206 | * it... | |
207 | */ | |
208 | ||
5a9febac MS |
209 | if (delim == ' ') |
210 | { | |
211 | while (*end && !isspace(*end & 255)) | |
212 | end ++; | |
213 | while (*end && isspace(*end & 255)) | |
214 | *end++ = '\0'; | |
215 | } | |
216 | else if ((end = strchr(start, delim)) != NULL) | |
eac3a0a0 MS |
217 | *end++ = '\0'; |
218 | else | |
219 | end = start + strlen(start); | |
220 | ||
a469f8a5 MS |
221 | DEBUG_printf(("1_cupsArrayAddStrings: Adding \"%s\", end=\"%s\"", start, |
222 | end)); | |
223 | ||
eac3a0a0 MS |
224 | if (!cupsArrayFind(a, start)) |
225 | status &= cupsArrayAdd(a, start); | |
226 | } | |
227 | ||
228 | free(buffer); | |
229 | } | |
230 | ||
a469f8a5 MS |
231 | DEBUG_printf(("1_cupsArrayAddStrings: Returning %d.", status)); |
232 | ||
eac3a0a0 MS |
233 | return (status); |
234 | } | |
235 | ||
236 | ||
ef416fc2 | 237 | /* |
238 | * 'cupsArrayClear()' - Clear the array. | |
5a738aea | 239 | * |
79e1d494 MS |
240 | * This function is equivalent to removing all elements in the array. |
241 | * The caller is responsible for freeing the memory used by the | |
242 | * elements themselves. | |
243 | * | |
f3c17241 | 244 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 245 | */ |
246 | ||
247 | void | |
248 | cupsArrayClear(cups_array_t *a) /* I - Array */ | |
249 | { | |
250 | /* | |
251 | * Range check input... | |
252 | */ | |
253 | ||
254 | if (!a) | |
255 | return; | |
256 | ||
10d09e33 MS |
257 | /* |
258 | * Free the existing elements as needed.. | |
259 | */ | |
260 | ||
261 | if (a->freefunc) | |
262 | { | |
263 | int i; /* Looping var */ | |
264 | void **e; /* Current element */ | |
265 | ||
266 | for (i = a->num_elements, e = a->elements; i > 0; i --, e ++) | |
267 | (a->freefunc)(*e, a->data); | |
268 | } | |
269 | ||
ef416fc2 | 270 | /* |
271 | * Set the number of elements to 0; we don't actually free the memory | |
272 | * here - that is done in cupsArrayDelete()... | |
273 | */ | |
274 | ||
275 | a->num_elements = 0; | |
276 | a->current = -1; | |
277 | a->insert = -1; | |
bd7854cb | 278 | a->unique = 1; |
ef416fc2 | 279 | a->num_saved = 0; |
280 | } | |
281 | ||
282 | ||
283 | /* | |
284 | * 'cupsArrayCount()' - Get the number of elements in the array. | |
5a738aea | 285 | * |
f3c17241 | 286 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 287 | */ |
288 | ||
289 | int /* O - Number of elements */ | |
290 | cupsArrayCount(cups_array_t *a) /* I - Array */ | |
291 | { | |
292 | /* | |
293 | * Range check input... | |
294 | */ | |
295 | ||
296 | if (!a) | |
297 | return (0); | |
298 | ||
299 | /* | |
300 | * Return the number of elements... | |
301 | */ | |
302 | ||
303 | return (a->num_elements); | |
304 | } | |
305 | ||
306 | ||
307 | /* | |
308 | * 'cupsArrayCurrent()' - Return the current element in the array. | |
5a738aea | 309 | * |
79e1d494 MS |
310 | * The current element is undefined until you call @link cupsArrayFind@, |
311 | * @link cupsArrayFirst@, or @link cupsArrayIndex@, or @link cupsArrayLast@. | |
312 | * | |
f3c17241 | 313 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 314 | */ |
315 | ||
316 | void * /* O - Element */ | |
317 | cupsArrayCurrent(cups_array_t *a) /* I - Array */ | |
318 | { | |
319 | /* | |
320 | * Range check input... | |
321 | */ | |
322 | ||
323 | if (!a) | |
324 | return (NULL); | |
325 | ||
326 | /* | |
327 | * Return the current element... | |
328 | */ | |
329 | ||
330 | if (a->current >= 0 && a->current < a->num_elements) | |
331 | return (a->elements[a->current]); | |
332 | else | |
333 | return (NULL); | |
334 | } | |
335 | ||
336 | ||
337 | /* | |
338 | * 'cupsArrayDelete()' - Free all memory used by the array. | |
5a738aea | 339 | * |
79e1d494 MS |
340 | * The caller is responsible for freeing the memory used by the |
341 | * elements themselves. | |
342 | * | |
f3c17241 | 343 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 344 | */ |
345 | ||
346 | void | |
347 | cupsArrayDelete(cups_array_t *a) /* I - Array */ | |
348 | { | |
349 | /* | |
350 | * Range check input... | |
351 | */ | |
352 | ||
353 | if (!a) | |
354 | return; | |
355 | ||
356 | /* | |
10d09e33 MS |
357 | * Free the elements if we have a free function (otherwise the caller is |
358 | * responsible for doing the dirty work...) | |
359 | */ | |
360 | ||
361 | if (a->freefunc) | |
362 | { | |
363 | int i; /* Looping var */ | |
364 | void **e; /* Current element */ | |
365 | ||
366 | for (i = a->num_elements, e = a->elements; i > 0; i --, e ++) | |
367 | (a->freefunc)(*e, a->data); | |
368 | } | |
369 | ||
370 | /* | |
371 | * Free the array of element pointers... | |
ef416fc2 | 372 | */ |
373 | ||
374 | if (a->alloc_elements) | |
375 | free(a->elements); | |
376 | ||
b94498cf | 377 | if (a->hashsize) |
378 | free(a->hash); | |
379 | ||
ef416fc2 | 380 | free(a); |
381 | } | |
382 | ||
383 | ||
384 | /* | |
385 | * 'cupsArrayDup()' - Duplicate the array. | |
5a738aea | 386 | * |
f3c17241 | 387 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 388 | */ |
389 | ||
390 | cups_array_t * /* O - Duplicate array */ | |
391 | cupsArrayDup(cups_array_t *a) /* I - Array */ | |
392 | { | |
393 | cups_array_t *da; /* Duplicate array */ | |
394 | ||
395 | ||
396 | /* | |
397 | * Range check input... | |
398 | */ | |
399 | ||
400 | if (!a) | |
401 | return (NULL); | |
402 | ||
403 | /* | |
404 | * Allocate memory for the array... | |
405 | */ | |
406 | ||
407 | da = calloc(1, sizeof(cups_array_t)); | |
408 | if (!da) | |
409 | return (NULL); | |
410 | ||
411 | da->compare = a->compare; | |
412 | da->data = a->data; | |
413 | da->current = a->current; | |
414 | da->insert = a->insert; | |
bd7854cb | 415 | da->unique = a->unique; |
ef416fc2 | 416 | da->num_saved = a->num_saved; |
417 | ||
418 | memcpy(da->saved, a->saved, sizeof(a->saved)); | |
419 | ||
420 | if (a->num_elements) | |
421 | { | |
422 | /* | |
423 | * Allocate memory for the elements... | |
424 | */ | |
425 | ||
426 | da->elements = malloc(a->num_elements * sizeof(void *)); | |
427 | if (!da->elements) | |
428 | { | |
429 | free(da); | |
430 | return (NULL); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Copy the element pointers... | |
435 | */ | |
436 | ||
10d09e33 MS |
437 | if (a->copyfunc) |
438 | { | |
439 | /* | |
440 | * Use the copy function to make a copy of each element... | |
441 | */ | |
442 | ||
443 | int i; /* Looping var */ | |
444 | ||
445 | for (i = 0; i < a->num_elements; i ++) | |
446 | da->elements[i] = (a->copyfunc)(a->elements[i], a->data); | |
447 | } | |
448 | else | |
449 | { | |
450 | /* | |
451 | * Just copy raw pointers... | |
452 | */ | |
453 | ||
454 | memcpy(da->elements, a->elements, a->num_elements * sizeof(void *)); | |
455 | } | |
456 | ||
ef416fc2 | 457 | da->num_elements = a->num_elements; |
458 | da->alloc_elements = a->num_elements; | |
459 | } | |
460 | ||
461 | /* | |
462 | * Return the new array... | |
463 | */ | |
464 | ||
465 | return (da); | |
466 | } | |
467 | ||
468 | ||
469 | /* | |
470 | * 'cupsArrayFind()' - Find an element in the array. | |
5a738aea | 471 | * |
f3c17241 | 472 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 473 | */ |
474 | ||
5a738aea | 475 | void * /* O - Element found or @code NULL@ */ |
ef416fc2 | 476 | cupsArrayFind(cups_array_t *a, /* I - Array */ |
477 | void *e) /* I - Element */ | |
478 | { | |
479 | int current, /* Current element */ | |
b94498cf | 480 | diff, /* Difference */ |
481 | hash; /* Hash index */ | |
ef416fc2 | 482 | |
483 | ||
484 | /* | |
485 | * Range check input... | |
486 | */ | |
487 | ||
488 | if (!a || !e) | |
489 | return (NULL); | |
490 | ||
491 | /* | |
492 | * See if we have any elements... | |
493 | */ | |
494 | ||
495 | if (!a->num_elements) | |
496 | return (NULL); | |
497 | ||
498 | /* | |
499 | * Yes, look for a match... | |
500 | */ | |
501 | ||
b94498cf | 502 | if (a->hash) |
503 | { | |
504 | hash = (*(a->hashfunc))(e, a->data); | |
505 | ||
506 | if (hash < 0 || hash >= a->hashsize) | |
507 | { | |
508 | current = a->current; | |
509 | hash = -1; | |
510 | } | |
511 | else | |
512 | { | |
513 | current = a->hash[hash]; | |
514 | ||
515 | if (current < 0 || current >= a->num_elements) | |
516 | current = a->current; | |
517 | } | |
518 | } | |
519 | else | |
520 | { | |
521 | current = a->current; | |
522 | hash = -1; | |
523 | } | |
524 | ||
525 | current = cups_array_find(a, e, current, &diff); | |
ef416fc2 | 526 | if (!diff) |
527 | { | |
528 | /* | |
bd7854cb | 529 | * Found a match! If the array does not contain unique values, find |
530 | * the first element that is the same... | |
ef416fc2 | 531 | */ |
532 | ||
bd7854cb | 533 | if (!a->unique && a->compare) |
534 | { | |
535 | /* | |
536 | * The array is not unique, find the first match... | |
537 | */ | |
538 | ||
539 | while (current > 0 && !(*(a->compare))(e, a->elements[current - 1], | |
540 | a->data)) | |
541 | current --; | |
542 | } | |
543 | ||
ef416fc2 | 544 | a->current = current; |
545 | ||
b94498cf | 546 | if (hash >= 0) |
547 | a->hash[hash] = current; | |
548 | ||
ef416fc2 | 549 | return (a->elements[current]); |
550 | } | |
551 | else | |
552 | { | |
553 | /* | |
554 | * No match... | |
555 | */ | |
556 | ||
557 | a->current = -1; | |
558 | ||
559 | return (NULL); | |
560 | } | |
561 | } | |
562 | ||
563 | ||
564 | /* | |
565 | * 'cupsArrayFirst()' - Get the first element in the array. | |
5a738aea | 566 | * |
f3c17241 | 567 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 568 | */ |
569 | ||
79e1d494 | 570 | void * /* O - First element or @code NULL@ if the array is empty */ |
ef416fc2 | 571 | cupsArrayFirst(cups_array_t *a) /* I - Array */ |
572 | { | |
573 | /* | |
574 | * Range check input... | |
575 | */ | |
576 | ||
577 | if (!a) | |
578 | return (NULL); | |
579 | ||
580 | /* | |
581 | * Return the first element... | |
582 | */ | |
583 | ||
584 | a->current = 0; | |
585 | ||
586 | return (cupsArrayCurrent(a)); | |
587 | } | |
588 | ||
589 | ||
f7deaa1a | 590 | /* |
591 | * 'cupsArrayGetIndex()' - Get the index of the current element. | |
592 | * | |
79e1d494 MS |
593 | * The current element is undefined until you call @link cupsArrayFind@, |
594 | * @link cupsArrayFirst@, or @link cupsArrayIndex@, or @link cupsArrayLast@. | |
595 | * | |
f3c17241 | 596 | * @since CUPS 1.3/OS X 10.5@ |
f7deaa1a | 597 | */ |
598 | ||
79e1d494 | 599 | int /* O - Index of the current element, starting at 0 */ |
f7deaa1a | 600 | cupsArrayGetIndex(cups_array_t *a) /* I - Array */ |
601 | { | |
602 | if (!a) | |
603 | return (-1); | |
604 | else | |
605 | return (a->current); | |
606 | } | |
607 | ||
608 | ||
609 | /* | |
610 | * 'cupsArrayGetInsert()' - Get the index of the last inserted element. | |
611 | * | |
f3c17241 | 612 | * @since CUPS 1.3/OS X 10.5@ |
f7deaa1a | 613 | */ |
614 | ||
79e1d494 | 615 | int /* O - Index of the last inserted element, starting at 0 */ |
f7deaa1a | 616 | cupsArrayGetInsert(cups_array_t *a) /* I - Array */ |
617 | { | |
618 | if (!a) | |
619 | return (-1); | |
620 | else | |
621 | return (a->insert); | |
622 | } | |
623 | ||
624 | ||
ef416fc2 | 625 | /* |
626 | * 'cupsArrayIndex()' - Get the N-th element in the array. | |
5a738aea | 627 | * |
f3c17241 | 628 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 629 | */ |
630 | ||
5a738aea | 631 | void * /* O - N-th element or @code NULL@ */ |
ef416fc2 | 632 | cupsArrayIndex(cups_array_t *a, /* I - Array */ |
633 | int n) /* I - Index into array, starting at 0 */ | |
634 | { | |
635 | if (!a) | |
636 | return (NULL); | |
637 | ||
638 | a->current = n; | |
639 | ||
640 | return (cupsArrayCurrent(a)); | |
641 | } | |
642 | ||
643 | ||
fa73b229 | 644 | /* |
645 | * 'cupsArrayInsert()' - Insert an element in the array. | |
646 | * | |
bd7854cb | 647 | * When inserting an element in a sorted array, non-unique elements are |
79e1d494 MS |
648 | * inserted at the beginning of the run of identical elements. For unsorted |
649 | * arrays, the element is inserted at the beginning of the array. | |
5a738aea | 650 | * |
f3c17241 | 651 | * @since CUPS 1.2/OS X 10.5@ |
fa73b229 | 652 | */ |
653 | ||
654 | int /* O - 0 on failure, 1 on success */ | |
655 | cupsArrayInsert(cups_array_t *a, /* I - Array */ | |
656 | void *e) /* I - Element */ | |
657 | { | |
e07d4801 | 658 | DEBUG_printf(("2cupsArrayInsert(a=%p, e=%p)", a, e)); |
fa73b229 | 659 | |
660 | /* | |
661 | * Range check input... | |
662 | */ | |
663 | ||
664 | if (!a || !e) | |
665 | { | |
e07d4801 | 666 | DEBUG_puts("3cupsArrayInsert: returning 0"); |
fa73b229 | 667 | return (0); |
668 | } | |
669 | ||
fa73b229 | 670 | /* |
671 | * Insert the element... | |
672 | */ | |
673 | ||
bd7854cb | 674 | return (cups_array_add(a, e, 1)); |
fa73b229 | 675 | } |
676 | ||
677 | ||
ef416fc2 | 678 | /* |
679 | * 'cupsArrayLast()' - Get the last element in the array. | |
5a738aea | 680 | * |
f3c17241 | 681 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 682 | */ |
683 | ||
79e1d494 | 684 | void * /* O - Last element or @code NULL@ if the array is empty */ |
ef416fc2 | 685 | cupsArrayLast(cups_array_t *a) /* I - Array */ |
686 | { | |
687 | /* | |
688 | * Range check input... | |
689 | */ | |
690 | ||
691 | if (!a) | |
692 | return (NULL); | |
693 | ||
694 | /* | |
695 | * Return the last element... | |
696 | */ | |
697 | ||
698 | a->current = a->num_elements - 1; | |
699 | ||
700 | return (cupsArrayCurrent(a)); | |
701 | } | |
702 | ||
703 | ||
704 | /* | |
705 | * 'cupsArrayNew()' - Create a new array. | |
5a738aea | 706 | * |
79e1d494 MS |
707 | * The comparison function ("f") is used to create a sorted array. The function |
708 | * receives pointers to two elements and the user data pointer ("d") - the user | |
709 | * data pointer argument can safely be omitted when not required so functions | |
710 | * like @code strcmp@ can be used for sorted string arrays. | |
711 | * | |
f3c17241 | 712 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 713 | */ |
714 | ||
715 | cups_array_t * /* O - Array */ | |
79e1d494 MS |
716 | cupsArrayNew(cups_array_func_t f, /* I - Comparison function or @code NULL@ for an unsorted array */ |
717 | void *d) /* I - User data pointer or @code NULL@ */ | |
b94498cf | 718 | { |
10d09e33 | 719 | return (cupsArrayNew3(f, d, 0, 0, 0, 0)); |
b94498cf | 720 | } |
721 | ||
722 | ||
723 | /* | |
724 | * 'cupsArrayNew2()' - Create a new array with hash. | |
725 | * | |
79e1d494 MS |
726 | * The comparison function ("f") is used to create a sorted array. The function |
727 | * receives pointers to two elements and the user data pointer ("d") - the user | |
728 | * data pointer argument can safely be omitted when not required so functions | |
729 | * like @code strcmp@ can be used for sorted string arrays. | |
730 | * | |
731 | * The hash function ("h") is used to implement cached lookups with the | |
732 | * specified hash size ("hsize"). | |
733 | * | |
f3c17241 | 734 | * @since CUPS 1.3/OS X 10.5@ |
b94498cf | 735 | */ |
736 | ||
737 | cups_array_t * /* O - Array */ | |
79e1d494 MS |
738 | cupsArrayNew2(cups_array_func_t f, /* I - Comparison function or @code NULL@ for an unsorted array */ |
739 | void *d, /* I - User data or @code NULL@ */ | |
740 | cups_ahash_func_t h, /* I - Hash function or @code NULL@ for unhashed lookups */ | |
741 | int hsize) /* I - Hash size (>= 0) */ | |
10d09e33 MS |
742 | { |
743 | return (cupsArrayNew3(f, d, h, hsize, 0, 0)); | |
744 | } | |
745 | ||
746 | ||
747 | /* | |
748 | * 'cupsArrayNew3()' - Create a new array with hash and/or free function. | |
749 | * | |
750 | * The comparison function ("f") is used to create a sorted array. The function | |
751 | * receives pointers to two elements and the user data pointer ("d") - the user | |
752 | * data pointer argument can safely be omitted when not required so functions | |
753 | * like @code strcmp@ can be used for sorted string arrays. | |
754 | * | |
755 | * The hash function ("h") is used to implement cached lookups with the | |
756 | * specified hash size ("hsize"). | |
757 | * | |
758 | * The copy function ("cf") is used to automatically copy/retain elements when | |
759 | * added or the array is copied. | |
760 | * | |
761 | * The free function ("cf") is used to automatically free/release elements when | |
762 | * removed or the array is deleted. | |
763 | * | |
f3c17241 | 764 | * @since CUPS 1.5/OS X 10.7@ |
10d09e33 MS |
765 | */ |
766 | ||
767 | cups_array_t * /* O - Array */ | |
768 | cupsArrayNew3(cups_array_func_t f, /* I - Comparison function or @code NULL@ for an unsorted array */ | |
769 | void *d, /* I - User data or @code NULL@ */ | |
770 | cups_ahash_func_t h, /* I - Hash function or @code NULL@ for unhashed lookups */ | |
771 | int hsize, /* I - Hash size (>= 0) */ | |
772 | cups_acopy_func_t cf, /* I - Copy function */ | |
773 | cups_afree_func_t ff) /* I - Free function */ | |
ef416fc2 | 774 | { |
775 | cups_array_t *a; /* Array */ | |
776 | ||
777 | ||
778 | /* | |
779 | * Allocate memory for the array... | |
780 | */ | |
781 | ||
782 | a = calloc(1, sizeof(cups_array_t)); | |
783 | if (!a) | |
784 | return (NULL); | |
785 | ||
786 | a->compare = f; | |
787 | a->data = d; | |
788 | a->current = -1; | |
789 | a->insert = -1; | |
790 | a->num_saved = 0; | |
bd7854cb | 791 | a->unique = 1; |
ef416fc2 | 792 | |
b94498cf | 793 | if (hsize > 0 && h) |
794 | { | |
795 | a->hashfunc = h; | |
796 | a->hashsize = hsize; | |
797 | a->hash = malloc(hsize * sizeof(int)); | |
798 | ||
799 | if (!a->hash) | |
800 | { | |
801 | free(a); | |
802 | return (NULL); | |
803 | } | |
804 | ||
805 | memset(a->hash, -1, hsize * sizeof(int)); | |
806 | } | |
807 | ||
10d09e33 MS |
808 | a->copyfunc = cf; |
809 | a->freefunc = ff; | |
810 | ||
ef416fc2 | 811 | return (a); |
812 | } | |
813 | ||
814 | ||
eac3a0a0 MS |
815 | /* |
816 | * '_cupsArrayNewStrings()' - Create a new array of comma-delimited strings. | |
817 | * | |
818 | * Note: The array automatically manages copies of the strings passed. If the | |
819 | * string pointer "s" is NULL or the empty string, no strings are added to the | |
820 | * newly created array. | |
821 | */ | |
822 | ||
823 | cups_array_t * /* O - Array */ | |
5a9febac MS |
824 | _cupsArrayNewStrings(const char *s, /* I - Delimited strings or NULL */ |
825 | char delim) /* I - Delimiter character */ | |
eac3a0a0 MS |
826 | { |
827 | cups_array_t *a; /* Array */ | |
828 | ||
829 | ||
830 | if ((a = cupsArrayNew3((cups_array_func_t)strcmp, NULL, NULL, 0, | |
831 | (cups_acopy_func_t)_cupsStrAlloc, | |
832 | (cups_afree_func_t)_cupsStrFree)) != NULL) | |
5a9febac | 833 | _cupsArrayAddStrings(a, s, delim); |
eac3a0a0 MS |
834 | |
835 | return (a); | |
836 | } | |
837 | ||
838 | ||
ef416fc2 | 839 | /* |
840 | * 'cupsArrayNext()' - Get the next element in the array. | |
5a738aea | 841 | * |
79e1d494 MS |
842 | * This function is equivalent to "cupsArrayIndex(a, cupsArrayGetIndex(a) + 1)". |
843 | * | |
844 | * The next element is undefined until you call @link cupsArrayFind@, | |
845 | * @link cupsArrayFirst@, or @link cupsArrayIndex@, or @link cupsArrayLast@ | |
846 | * to set the current element. | |
847 | * | |
f3c17241 | 848 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 849 | */ |
850 | ||
5a738aea | 851 | void * /* O - Next element or @code NULL@ */ |
ef416fc2 | 852 | cupsArrayNext(cups_array_t *a) /* I - Array */ |
853 | { | |
854 | /* | |
855 | * Range check input... | |
856 | */ | |
857 | ||
858 | if (!a) | |
859 | return (NULL); | |
860 | ||
861 | /* | |
862 | * Return the next element... | |
863 | */ | |
864 | ||
865 | if (a->current < a->num_elements) | |
866 | a->current ++; | |
867 | ||
868 | return (cupsArrayCurrent(a)); | |
869 | } | |
870 | ||
871 | ||
872 | /* | |
873 | * 'cupsArrayPrev()' - Get the previous element in the array. | |
5a738aea | 874 | * |
79e1d494 MS |
875 | * This function is equivalent to "cupsArrayIndex(a, cupsArrayGetIndex(a) - 1)". |
876 | * | |
877 | * The previous element is undefined until you call @link cupsArrayFind@, | |
878 | * @link cupsArrayFirst@, or @link cupsArrayIndex@, or @link cupsArrayLast@ | |
879 | * to set the current element. | |
880 | * | |
f3c17241 | 881 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 882 | */ |
883 | ||
5a738aea | 884 | void * /* O - Previous element or @code NULL@ */ |
ef416fc2 | 885 | cupsArrayPrev(cups_array_t *a) /* I - Array */ |
886 | { | |
887 | /* | |
888 | * Range check input... | |
889 | */ | |
890 | ||
891 | if (!a) | |
892 | return (NULL); | |
893 | ||
894 | /* | |
895 | * Return the previous element... | |
896 | */ | |
897 | ||
898 | if (a->current >= 0) | |
899 | a->current --; | |
900 | ||
901 | return (cupsArrayCurrent(a)); | |
902 | } | |
903 | ||
904 | ||
905 | /* | |
906 | * 'cupsArrayRemove()' - Remove an element from the array. | |
5a738aea | 907 | * |
79e1d494 MS |
908 | * If more than one element matches "e", only the first matching element is |
909 | * removed. | |
910 | * | |
911 | * The caller is responsible for freeing the memory used by the | |
912 | * removed element. | |
913 | * | |
f3c17241 | 914 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 915 | */ |
916 | ||
917 | int /* O - 1 on success, 0 on failure */ | |
918 | cupsArrayRemove(cups_array_t *a, /* I - Array */ | |
919 | void *e) /* I - Element */ | |
920 | { | |
921 | int i, /* Looping var */ | |
922 | current, /* Current element */ | |
923 | diff; /* Difference */ | |
924 | ||
925 | ||
926 | /* | |
927 | * Range check input... | |
928 | */ | |
929 | ||
930 | if (!a || !e) | |
931 | return (0); | |
932 | ||
933 | /* | |
934 | * See if the element is in the array... | |
935 | */ | |
936 | ||
937 | if (!a->num_elements) | |
938 | return (0); | |
939 | ||
bd7854cb | 940 | current = cups_array_find(a, e, a->current, &diff); |
ef416fc2 | 941 | if (diff) |
942 | return (0); | |
943 | ||
944 | /* | |
945 | * Yes, now remove it... | |
946 | */ | |
947 | ||
948 | a->num_elements --; | |
949 | ||
10d09e33 MS |
950 | if (a->freefunc) |
951 | (a->freefunc)(a->elements[current], a->data); | |
952 | ||
ef416fc2 | 953 | if (current < a->num_elements) |
954 | memmove(a->elements + current, a->elements + current + 1, | |
955 | (a->num_elements - current) * sizeof(void *)); | |
956 | ||
957 | if (current <= a->current) | |
958 | a->current --; | |
959 | ||
f7deaa1a | 960 | if (current < a->insert) |
ef416fc2 | 961 | a->insert --; |
f7deaa1a | 962 | else if (current == a->insert) |
963 | a->insert = -1; | |
ef416fc2 | 964 | |
965 | for (i = 0; i < a->num_saved; i ++) | |
966 | if (current <= a->saved[i]) | |
967 | a->saved[i] --; | |
968 | ||
bd7854cb | 969 | if (a->num_elements <= 1) |
970 | a->unique = 1; | |
971 | ||
ef416fc2 | 972 | return (1); |
973 | } | |
974 | ||
975 | ||
976 | /* | |
79e1d494 | 977 | * 'cupsArrayRestore()' - Reset the current element to the last @link cupsArraySave@. |
5a738aea | 978 | * |
f3c17241 | 979 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 980 | */ |
981 | ||
982 | void * /* O - New current element */ | |
983 | cupsArrayRestore(cups_array_t *a) /* I - Array */ | |
984 | { | |
985 | if (!a) | |
986 | return (NULL); | |
987 | ||
988 | if (a->num_saved <= 0) | |
989 | return (NULL); | |
990 | ||
991 | a->num_saved --; | |
992 | a->current = a->saved[a->num_saved]; | |
993 | ||
994 | if (a->current >= 0 && a->current < a->num_elements) | |
995 | return (a->elements[a->current]); | |
996 | else | |
997 | return (NULL); | |
998 | } | |
999 | ||
1000 | ||
1001 | /* | |
79e1d494 MS |
1002 | * 'cupsArraySave()' - Mark the current element for a later @link cupsArrayRestore@. |
1003 | * | |
1004 | * The current element is undefined until you call @link cupsArrayFind@, | |
1005 | * @link cupsArrayFirst@, or @link cupsArrayIndex@, or @link cupsArrayLast@ | |
1006 | * to set the current element. | |
ef416fc2 | 1007 | * |
1008 | * The save/restore stack is guaranteed to be at least 32 elements deep. | |
5a738aea | 1009 | * |
f3c17241 | 1010 | * @since CUPS 1.2/OS X 10.5@ |
ef416fc2 | 1011 | */ |
1012 | ||
1013 | int /* O - 1 on success, 0 on failure */ | |
1014 | cupsArraySave(cups_array_t *a) /* I - Array */ | |
1015 | { | |
1016 | if (!a) | |
1017 | return (0); | |
1018 | ||
1019 | if (a->num_saved >= _CUPS_MAXSAVE) | |
1020 | return (0); | |
1021 | ||
1022 | a->saved[a->num_saved] = a->current; | |
1023 | a->num_saved ++; | |
1024 | ||
1025 | return (1); | |
1026 | } | |
1027 | ||
1028 | ||
e1d6a774 | 1029 | /* |
1030 | * 'cupsArrayUserData()' - Return the user data for an array. | |
5a738aea | 1031 | * |
f3c17241 | 1032 | * @since CUPS 1.2/OS X 10.5@ |
e1d6a774 | 1033 | */ |
1034 | ||
1035 | void * /* O - User data */ | |
1036 | cupsArrayUserData(cups_array_t *a) /* I - Array */ | |
1037 | { | |
1038 | if (a) | |
1039 | return (a->data); | |
1040 | else | |
1041 | return (NULL); | |
1042 | } | |
1043 | ||
1044 | ||
ef416fc2 | 1045 | /* |
eac3a0a0 | 1046 | * 'cups_array_add()' - Insert or append an element to the array. |
5a738aea | 1047 | * |
f3c17241 | 1048 | * @since CUPS 1.2/OS X 10.5@ |
bd7854cb | 1049 | */ |
1050 | ||
1051 | static int /* O - 1 on success, 0 on failure */ | |
1052 | cups_array_add(cups_array_t *a, /* I - Array */ | |
1053 | void *e, /* I - Element to add */ | |
1054 | int insert) /* I - 1 = insert, 0 = append */ | |
1055 | { | |
1056 | int i, /* Looping var */ | |
1057 | current, /* Current element */ | |
1058 | diff; /* Comparison with current element */ | |
1059 | ||
1060 | ||
e07d4801 | 1061 | DEBUG_printf(("7cups_array_add(a=%p, e=%p, insert=%d)", a, e, insert)); |
bd7854cb | 1062 | |
1063 | /* | |
1064 | * Verify we have room for the new element... | |
1065 | */ | |
1066 | ||
1067 | if (a->num_elements >= a->alloc_elements) | |
1068 | { | |
1069 | /* | |
1070 | * Allocate additional elements; start with 16 elements, then | |
1071 | * double the size until 1024 elements, then add 1024 elements | |
1072 | * thereafter... | |
1073 | */ | |
1074 | ||
1075 | void **temp; /* New array elements */ | |
1076 | int count; /* New allocation count */ | |
1077 | ||
1078 | ||
1079 | if (a->alloc_elements == 0) | |
1080 | { | |
1081 | count = 16; | |
1082 | temp = malloc(count * sizeof(void *)); | |
1083 | } | |
1084 | else | |
1085 | { | |
1086 | if (a->alloc_elements < 1024) | |
1087 | count = a->alloc_elements * 2; | |
1088 | else | |
1089 | count = a->alloc_elements + 1024; | |
1090 | ||
1091 | temp = realloc(a->elements, count * sizeof(void *)); | |
1092 | } | |
1093 | ||
e07d4801 | 1094 | DEBUG_printf(("9cups_array_add: count=%d", count)); |
bd7854cb | 1095 | |
1096 | if (!temp) | |
1097 | { | |
e07d4801 | 1098 | DEBUG_puts("9cups_array_add: allocation failed, returning 0"); |
bd7854cb | 1099 | return (0); |
1100 | } | |
1101 | ||
1102 | a->alloc_elements = count; | |
1103 | a->elements = temp; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Find the insertion point for the new element; if there is no | |
1108 | * compare function or elements, just add it to the beginning or end... | |
1109 | */ | |
1110 | ||
1111 | if (!a->num_elements || !a->compare) | |
1112 | { | |
1113 | /* | |
1114 | * No elements or comparison function, insert/append as needed... | |
1115 | */ | |
1116 | ||
1117 | if (insert) | |
1118 | current = 0; /* Insert at beginning */ | |
1119 | else | |
1120 | current = a->num_elements; /* Append to the end */ | |
1121 | } | |
1122 | else | |
1123 | { | |
1124 | /* | |
1125 | * Do a binary search for the insertion point... | |
1126 | */ | |
1127 | ||
1128 | current = cups_array_find(a, e, a->insert, &diff); | |
1129 | ||
1130 | if (diff > 0) | |
1131 | { | |
1132 | /* | |
1133 | * Insert after the current element... | |
1134 | */ | |
1135 | ||
1136 | current ++; | |
1137 | } | |
1138 | else if (!diff) | |
1139 | { | |
1140 | /* | |
1141 | * Compared equal, make sure we add to the begining or end of | |
1142 | * the current run of equal elements... | |
1143 | */ | |
1144 | ||
1145 | a->unique = 0; | |
1146 | ||
1147 | if (insert) | |
1148 | { | |
1149 | /* | |
1150 | * Insert at beginning of run... | |
1151 | */ | |
1152 | ||
1153 | while (current > 0 && !(*(a->compare))(e, a->elements[current - 1], | |
1154 | a->data)) | |
1155 | current --; | |
1156 | } | |
1157 | else | |
1158 | { | |
1159 | /* | |
1160 | * Append at end of run... | |
1161 | */ | |
1162 | ||
1163 | do | |
1164 | { | |
1165 | current ++; | |
1166 | } | |
1167 | while (current < a->num_elements && | |
1168 | !(*(a->compare))(e, a->elements[current], a->data)); | |
1169 | } | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Insert or append the element... | |
1175 | */ | |
1176 | ||
1177 | if (current < a->num_elements) | |
1178 | { | |
1179 | /* | |
1180 | * Shift other elements to the right... | |
1181 | */ | |
1182 | ||
1183 | memmove(a->elements + current + 1, a->elements + current, | |
1184 | (a->num_elements - current) * sizeof(void *)); | |
1185 | ||
1186 | if (a->current >= current) | |
1187 | a->current ++; | |
1188 | ||
1189 | for (i = 0; i < a->num_saved; i ++) | |
1190 | if (a->saved[i] >= current) | |
1191 | a->saved[i] ++; | |
1192 | ||
e07d4801 | 1193 | DEBUG_printf(("9cups_array_add: insert element at index %d...", current)); |
bd7854cb | 1194 | } |
1195 | #ifdef DEBUG | |
1196 | else | |
e07d4801 | 1197 | DEBUG_printf(("9cups_array_add: append element at %d...", current)); |
bd7854cb | 1198 | #endif /* DEBUG */ |
1199 | ||
10d09e33 MS |
1200 | if (a->copyfunc) |
1201 | { | |
1202 | if ((a->elements[current] = (a->copyfunc)(e, a->data)) == NULL) | |
1203 | { | |
1204 | DEBUG_puts("8cups_array_add: Copy function returned NULL, returning 0"); | |
1205 | return (0); | |
1206 | } | |
1207 | } | |
1208 | else | |
1209 | a->elements[current] = e; | |
1210 | ||
bd7854cb | 1211 | a->num_elements ++; |
1212 | a->insert = current; | |
1213 | ||
1214 | #ifdef DEBUG | |
1215 | for (current = 0; current < a->num_elements; current ++) | |
e07d4801 | 1216 | DEBUG_printf(("9cups_array_add: a->elements[%d]=%p", current, |
ae71f5de | 1217 | a->elements[current])); |
bd7854cb | 1218 | #endif /* DEBUG */ |
1219 | ||
e07d4801 | 1220 | DEBUG_puts("9cups_array_add: returning 1"); |
bd7854cb | 1221 | |
1222 | return (1); | |
1223 | } | |
1224 | ||
1225 | ||
1226 | /* | |
eac3a0a0 | 1227 | * 'cups_array_find()' - Find an element in the array. |
ef416fc2 | 1228 | */ |
1229 | ||
1230 | static int /* O - Index of match */ | |
bd7854cb | 1231 | cups_array_find(cups_array_t *a, /* I - Array */ |
1232 | void *e, /* I - Element */ | |
1233 | int prev, /* I - Previous index */ | |
1234 | int *rdiff) /* O - Difference of match */ | |
ef416fc2 | 1235 | { |
1236 | int left, /* Left side of search */ | |
1237 | right, /* Right side of search */ | |
1238 | current, /* Current element */ | |
1239 | diff; /* Comparison with current element */ | |
1240 | ||
1241 | ||
e07d4801 | 1242 | DEBUG_printf(("7cups_array_find(a=%p, e=%p, prev=%d, rdiff=%p)", a, e, prev, |
ef416fc2 | 1243 | rdiff)); |
1244 | ||
1245 | if (a->compare) | |
1246 | { | |
1247 | /* | |
1248 | * Do a binary search for the element... | |
1249 | */ | |
1250 | ||
e07d4801 | 1251 | DEBUG_puts("9cups_array_find: binary search"); |
ef416fc2 | 1252 | |
1253 | if (prev >= 0 && prev < a->num_elements) | |
1254 | { | |
1255 | /* | |
1256 | * Start search on either side of previous... | |
1257 | */ | |
1258 | ||
1259 | if ((diff = (*(a->compare))(e, a->elements[prev], a->data)) == 0 || | |
1260 | (diff < 0 && prev == 0) || | |
1261 | (diff > 0 && prev == (a->num_elements - 1))) | |
1262 | { | |
1263 | /* | |
1264 | * Exact or edge match, return it! | |
1265 | */ | |
1266 | ||
e07d4801 | 1267 | DEBUG_printf(("9cups_array_find: Returning %d, diff=%d", prev, diff)); |
ef416fc2 | 1268 | |
1269 | *rdiff = diff; | |
1270 | ||
1271 | return (prev); | |
1272 | } | |
1273 | else if (diff < 0) | |
1274 | { | |
1275 | /* | |
1276 | * Start with previous on right side... | |
1277 | */ | |
1278 | ||
1279 | left = 0; | |
1280 | right = prev; | |
1281 | } | |
1282 | else | |
1283 | { | |
1284 | /* | |
1285 | * Start wih previous on left side... | |
1286 | */ | |
1287 | ||
1288 | left = prev; | |
1289 | right = a->num_elements - 1; | |
1290 | } | |
1291 | } | |
1292 | else | |
1293 | { | |
1294 | /* | |
1295 | * Start search in the middle... | |
1296 | */ | |
1297 | ||
1298 | left = 0; | |
1299 | right = a->num_elements - 1; | |
1300 | } | |
1301 | ||
1302 | do | |
1303 | { | |
1304 | current = (left + right) / 2; | |
1305 | diff = (*(a->compare))(e, a->elements[current], a->data); | |
1306 | ||
e07d4801 | 1307 | DEBUG_printf(("9cups_array_find: left=%d, right=%d, current=%d, diff=%d", |
ef416fc2 | 1308 | left, right, current, diff)); |
1309 | ||
1310 | if (diff == 0) | |
1311 | break; | |
1312 | else if (diff < 0) | |
1313 | right = current; | |
1314 | else | |
1315 | left = current; | |
1316 | } | |
1317 | while ((right - left) > 1); | |
1318 | ||
1319 | if (diff != 0) | |
1320 | { | |
1321 | /* | |
1322 | * Check the last 1 or 2 elements... | |
1323 | */ | |
1324 | ||
1325 | if ((diff = (*(a->compare))(e, a->elements[left], a->data)) <= 0) | |
1326 | current = left; | |
1327 | else | |
1328 | { | |
1329 | diff = (*(a->compare))(e, a->elements[right], a->data); | |
1330 | current = right; | |
1331 | } | |
1332 | } | |
1333 | } | |
1334 | else | |
1335 | { | |
1336 | /* | |
1337 | * Do a linear pointer search... | |
1338 | */ | |
1339 | ||
e07d4801 | 1340 | DEBUG_puts("9cups_array_find: linear search"); |
ef416fc2 | 1341 | |
a74454a7 | 1342 | diff = 1; |
ef416fc2 | 1343 | |
1344 | for (current = 0; current < a->num_elements; current ++) | |
1345 | if (a->elements[current] == e) | |
a74454a7 | 1346 | { |
1347 | diff = 0; | |
ef416fc2 | 1348 | break; |
a74454a7 | 1349 | } |
ef416fc2 | 1350 | } |
1351 | ||
1352 | /* | |
1353 | * Return the closest element and the difference... | |
1354 | */ | |
1355 | ||
e07d4801 | 1356 | DEBUG_printf(("8cups_array_find: Returning %d, diff=%d", current, diff)); |
ef416fc2 | 1357 | |
1358 | *rdiff = diff; | |
1359 | ||
1360 | return (current); | |
1361 | } | |
1362 | ||
1363 | ||
1364 | /* | |
f2d18633 | 1365 | * End of "$Id$". |
ef416fc2 | 1366 | */ |