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Commit | Line | Data |
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ef416fc2 | 1 | /* |
7e86f2f6 | 2 | * Option routines for CUPS. |
ef416fc2 | 3 | * |
7e86f2f6 MS |
4 | * Copyright 2007-2014 by Apple Inc. |
5 | * Copyright 1997-2007 by Easy Software Products. | |
ef416fc2 | 6 | * |
7e86f2f6 MS |
7 | * These coded instructions, statements, and computer programs are the |
8 | * property of Apple Inc. and are protected by Federal copyright | |
9 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
10 | * which should have been included with this file. If this file is | |
11 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
ef416fc2 | 12 | * |
7e86f2f6 | 13 | * This file is subject to the Apple OS-Developed Software exception. |
ef416fc2 | 14 | */ |
15 | ||
16 | /* | |
17 | * Include necessary headers... | |
18 | */ | |
19 | ||
7cf5915e | 20 | #include "cups-private.h" |
ef416fc2 | 21 | |
22 | ||
426c6a59 MS |
23 | /* |
24 | * Local functions... | |
25 | */ | |
26 | ||
27 | static int cups_compare_options(cups_option_t *a, cups_option_t *b); | |
28 | static int cups_find_option(const char *name, int num_options, | |
29 | cups_option_t *option, int prev, int *rdiff); | |
30 | ||
31 | ||
ef416fc2 | 32 | /* |
33 | * 'cupsAddOption()' - Add an option to an option array. | |
5a738aea MS |
34 | * |
35 | * New option arrays can be initialized simply by passing 0 for the | |
36 | * "num_options" parameter. | |
ef416fc2 | 37 | */ |
38 | ||
5a738aea MS |
39 | int /* O - Number of options */ |
40 | cupsAddOption(const char *name, /* I - Name of option */ | |
41 | const char *value, /* I - Value of option */ | |
42 | int num_options,/* I - Number of options */ | |
ef416fc2 | 43 | cups_option_t **options) /* IO - Pointer to options */ |
44 | { | |
ef416fc2 | 45 | cups_option_t *temp; /* Pointer to new option */ |
426c6a59 MS |
46 | int insert, /* Insertion point */ |
47 | diff; /* Result of search */ | |
ef416fc2 | 48 | |
49 | ||
807315e6 | 50 | DEBUG_printf(("2cupsAddOption(name=\"%s\", value=\"%s\", num_options=%d, options=%p)", name, value, num_options, (void *)options)); |
88f9aafc | 51 | |
20fbc903 MS |
52 | if (!name || !name[0] || !value || !options || num_options < 0) |
53 | { | |
f11a948a | 54 | DEBUG_printf(("3cupsAddOption: Returning %d", num_options)); |
ef416fc2 | 55 | return (num_options); |
20fbc903 | 56 | } |
ef416fc2 | 57 | |
58 | /* | |
59 | * Look for an existing option with the same name... | |
60 | */ | |
61 | ||
426c6a59 MS |
62 | if (num_options == 0) |
63 | { | |
64 | insert = 0; | |
65 | diff = 1; | |
66 | } | |
67 | else | |
68 | { | |
69 | insert = cups_find_option(name, num_options, *options, num_options - 1, | |
70 | &diff); | |
ef416fc2 | 71 | |
426c6a59 MS |
72 | if (diff > 0) |
73 | insert ++; | |
74 | } | |
75 | ||
76 | if (diff) | |
ef416fc2 | 77 | { |
78 | /* | |
79 | * No matching option name... | |
80 | */ | |
81 | ||
f11a948a | 82 | DEBUG_printf(("4cupsAddOption: New option inserted at index %d...", |
426c6a59 | 83 | insert)); |
20fbc903 | 84 | |
ef416fc2 | 85 | if (num_options == 0) |
86 | temp = (cups_option_t *)malloc(sizeof(cups_option_t)); | |
87 | else | |
7e86f2f6 | 88 | temp = (cups_option_t *)realloc(*options, sizeof(cups_option_t) * (size_t)(num_options + 1)); |
ef416fc2 | 89 | |
7e86f2f6 | 90 | if (!temp) |
20fbc903 | 91 | { |
f11a948a | 92 | DEBUG_puts("3cupsAddOption: Unable to expand option array, returning 0"); |
ef416fc2 | 93 | return (0); |
20fbc903 | 94 | } |
ef416fc2 | 95 | |
426c6a59 MS |
96 | *options = temp; |
97 | ||
98 | if (insert < num_options) | |
99 | { | |
f11a948a | 100 | DEBUG_printf(("4cupsAddOption: Shifting %d options...", |
426c6a59 | 101 | (int)(num_options - insert))); |
7e86f2f6 | 102 | memmove(temp + insert + 1, temp + insert, (size_t)(num_options - insert) * sizeof(cups_option_t)); |
426c6a59 MS |
103 | } |
104 | ||
105 | temp += insert; | |
2e4ff8af | 106 | temp->name = _cupsStrAlloc(name); |
ef416fc2 | 107 | num_options ++; |
108 | } | |
109 | else | |
110 | { | |
111 | /* | |
112 | * Match found; free the old value... | |
113 | */ | |
114 | ||
f11a948a | 115 | DEBUG_printf(("4cupsAddOption: Option already exists at index %d...", |
426c6a59 MS |
116 | insert)); |
117 | ||
118 | temp = *options + insert; | |
2e4ff8af | 119 | _cupsStrFree(temp->value); |
ef416fc2 | 120 | } |
121 | ||
2e4ff8af | 122 | temp->value = _cupsStrAlloc(value); |
ef416fc2 | 123 | |
f11a948a | 124 | DEBUG_printf(("3cupsAddOption: Returning %d", num_options)); |
20fbc903 | 125 | |
ef416fc2 | 126 | return (num_options); |
127 | } | |
128 | ||
129 | ||
130 | /* | |
131 | * 'cupsFreeOptions()' - Free all memory used by options. | |
132 | */ | |
133 | ||
134 | void | |
135 | cupsFreeOptions( | |
136 | int num_options, /* I - Number of options */ | |
137 | cups_option_t *options) /* I - Pointer to options */ | |
138 | { | |
139 | int i; /* Looping var */ | |
140 | ||
141 | ||
807315e6 | 142 | DEBUG_printf(("cupsFreeOptions(num_options=%d, options=%p)", num_options, (void *)options)); |
20fbc903 MS |
143 | |
144 | if (num_options <= 0 || !options) | |
ef416fc2 | 145 | return; |
146 | ||
147 | for (i = 0; i < num_options; i ++) | |
148 | { | |
2e4ff8af MS |
149 | _cupsStrFree(options[i].name); |
150 | _cupsStrFree(options[i].value); | |
ef416fc2 | 151 | } |
152 | ||
153 | free(options); | |
154 | } | |
155 | ||
156 | ||
157 | /* | |
158 | * 'cupsGetOption()' - Get an option value. | |
159 | */ | |
160 | ||
5a738aea | 161 | const char * /* O - Option value or @code NULL@ */ |
ef416fc2 | 162 | cupsGetOption(const char *name, /* I - Name of option */ |
163 | int num_options,/* I - Number of options */ | |
164 | cups_option_t *options) /* I - Options */ | |
165 | { | |
426c6a59 MS |
166 | int diff, /* Result of comparison */ |
167 | match; /* Matching index */ | |
ef416fc2 | 168 | |
169 | ||
807315e6 | 170 | DEBUG_printf(("2cupsGetOption(name=\"%s\", num_options=%d, options=%p)", name, num_options, (void *)options)); |
20fbc903 MS |
171 | |
172 | if (!name || num_options <= 0 || !options) | |
173 | { | |
e07d4801 | 174 | DEBUG_puts("3cupsGetOption: Returning NULL"); |
ef416fc2 | 175 | return (NULL); |
20fbc903 | 176 | } |
ef416fc2 | 177 | |
426c6a59 MS |
178 | match = cups_find_option(name, num_options, options, -1, &diff); |
179 | ||
180 | if (!diff) | |
181 | { | |
e07d4801 | 182 | DEBUG_printf(("3cupsGetOption: Returning \"%s\"", options[match].value)); |
426c6a59 MS |
183 | return (options[match].value); |
184 | } | |
ef416fc2 | 185 | |
e07d4801 | 186 | DEBUG_puts("3cupsGetOption: Returning NULL"); |
ef416fc2 | 187 | return (NULL); |
188 | } | |
189 | ||
190 | ||
ef416fc2 | 191 | /* |
b423cd4c | 192 | * 'cupsParseOptions()' - Parse options from a command-line argument. |
193 | * | |
194 | * This function converts space-delimited name/value pairs according | |
195 | * to the PAPI text option ABNF specification. Collection values | |
196 | * ("name={a=... b=... c=...}") are stored with the curley brackets | |
5a738aea MS |
197 | * intact - use @code cupsParseOptions@ on the value to extract the |
198 | * collection attributes. | |
b423cd4c | 199 | */ |
200 | ||
201 | int /* O - Number of options found */ | |
202 | cupsParseOptions( | |
203 | const char *arg, /* I - Argument to parse */ | |
204 | int num_options, /* I - Number of options */ | |
205 | cups_option_t **options) /* O - Options found */ | |
206 | { | |
207 | char *copyarg, /* Copy of input string */ | |
208 | *ptr, /* Pointer into string */ | |
209 | *name, /* Pointer to name */ | |
5a738aea | 210 | *value, /* Pointer to value */ |
426c6a59 | 211 | sep, /* Separator character */ |
5a738aea | 212 | quote; /* Quote character */ |
b423cd4c | 213 | |
214 | ||
807315e6 | 215 | DEBUG_printf(("cupsParseOptions(arg=\"%s\", num_options=%d, options=%p)", arg, num_options, (void *)options)); |
20fbc903 | 216 | |
91c84a35 MS |
217 | /* |
218 | * Range check input... | |
219 | */ | |
220 | ||
221 | if (!arg) | |
20fbc903 | 222 | { |
e07d4801 | 223 | DEBUG_printf(("1cupsParseOptions: Returning %d", num_options)); |
91c84a35 | 224 | return (num_options); |
20fbc903 | 225 | } |
91c84a35 MS |
226 | |
227 | if (!options || num_options < 0) | |
20fbc903 | 228 | { |
e07d4801 | 229 | DEBUG_puts("1cupsParseOptions: Returning 0"); |
b423cd4c | 230 | return (0); |
20fbc903 | 231 | } |
b423cd4c | 232 | |
233 | /* | |
234 | * Make a copy of the argument string and then divide it up... | |
235 | */ | |
236 | ||
91c84a35 | 237 | if ((copyarg = strdup(arg)) == NULL) |
20fbc903 | 238 | { |
e07d4801 MS |
239 | DEBUG_puts("1cupsParseOptions: Unable to copy arg string"); |
240 | DEBUG_printf(("1cupsParseOptions: Returning %d", num_options)); | |
91c84a35 | 241 | return (num_options); |
20fbc903 | 242 | } |
91c84a35 | 243 | |
ee571f26 MS |
244 | if (*copyarg == '{') |
245 | { | |
246 | /* | |
247 | * Remove surrounding {} so we can parse "{name=value ... name=value}"... | |
248 | */ | |
249 | ||
250 | if ((ptr = copyarg + strlen(copyarg) - 1) > copyarg && *ptr == '}') | |
251 | { | |
252 | *ptr = '\0'; | |
253 | ptr = copyarg + 1; | |
254 | } | |
255 | else | |
256 | ptr = copyarg; | |
257 | } | |
258 | else | |
259 | ptr = copyarg; | |
b423cd4c | 260 | |
261 | /* | |
262 | * Skip leading spaces... | |
263 | */ | |
264 | ||
7cf5915e | 265 | while (_cups_isspace(*ptr)) |
b423cd4c | 266 | ptr ++; |
267 | ||
268 | /* | |
269 | * Loop through the string... | |
270 | */ | |
271 | ||
272 | while (*ptr != '\0') | |
273 | { | |
274 | /* | |
275 | * Get the name up to a SPACE, =, or end-of-string... | |
276 | */ | |
277 | ||
278 | name = ptr; | |
7cf5915e | 279 | while (!strchr("\f\n\r\t\v =", *ptr) && *ptr) |
b423cd4c | 280 | ptr ++; |
281 | ||
282 | /* | |
283 | * Avoid an empty name... | |
284 | */ | |
285 | ||
286 | if (ptr == name) | |
287 | break; | |
288 | ||
289 | /* | |
290 | * Skip trailing spaces... | |
291 | */ | |
292 | ||
7cf5915e | 293 | while (_cups_isspace(*ptr)) |
b423cd4c | 294 | *ptr++ = '\0'; |
295 | ||
426c6a59 MS |
296 | if ((sep = *ptr) == '=') |
297 | *ptr++ = '\0'; | |
298 | ||
e07d4801 | 299 | DEBUG_printf(("2cupsParseOptions: name=\"%s\"", name)); |
20fbc903 | 300 | |
426c6a59 | 301 | if (sep != '=') |
b423cd4c | 302 | { |
303 | /* | |
5a738aea | 304 | * Boolean option... |
b423cd4c | 305 | */ |
306 | ||
88f9aafc | 307 | if (!_cups_strncasecmp(name, "no", 2)) |
b423cd4c | 308 | num_options = cupsAddOption(name + 2, "false", num_options, |
309 | options); | |
310 | else | |
311 | num_options = cupsAddOption(name, "true", num_options, options); | |
312 | ||
313 | continue; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Remove = and parse the value... | |
318 | */ | |
319 | ||
426c6a59 | 320 | value = ptr; |
b423cd4c | 321 | |
7cf5915e | 322 | while (*ptr && !_cups_isspace(*ptr)) |
b423cd4c | 323 | { |
20fbc903 MS |
324 | if (*ptr == ',') |
325 | ptr ++; | |
326 | else if (*ptr == '\'' || *ptr == '\"') | |
b423cd4c | 327 | { |
20fbc903 MS |
328 | /* |
329 | * Quoted string constant... | |
330 | */ | |
b423cd4c | 331 | |
20fbc903 MS |
332 | quote = *ptr; |
333 | _cups_strcpy(ptr, ptr + 1); | |
b423cd4c | 334 | |
20fbc903 MS |
335 | while (*ptr != quote && *ptr) |
336 | { | |
337 | if (*ptr == '\\' && ptr[1]) | |
338 | _cups_strcpy(ptr, ptr + 1); | |
339 | ||
340 | ptr ++; | |
341 | } | |
b423cd4c | 342 | |
20fbc903 MS |
343 | if (*ptr) |
344 | _cups_strcpy(ptr, ptr + 1); | |
345 | } | |
346 | else if (*ptr == '{') | |
347 | { | |
348 | /* | |
349 | * Collection value... | |
350 | */ | |
b423cd4c | 351 | |
20fbc903 | 352 | int depth; |
b423cd4c | 353 | |
20fbc903 | 354 | for (depth = 0; *ptr; ptr ++) |
b423cd4c | 355 | { |
20fbc903 MS |
356 | if (*ptr == '{') |
357 | depth ++; | |
358 | else if (*ptr == '}') | |
b423cd4c | 359 | { |
20fbc903 MS |
360 | depth --; |
361 | if (!depth) | |
362 | { | |
363 | ptr ++; | |
b423cd4c | 364 | break; |
20fbc903 | 365 | } |
b423cd4c | 366 | } |
20fbc903 MS |
367 | else if (*ptr == '\\' && ptr[1]) |
368 | _cups_strcpy(ptr, ptr + 1); | |
369 | } | |
370 | } | |
371 | else | |
b423cd4c | 372 | { |
20fbc903 MS |
373 | /* |
374 | * Normal space-delimited string... | |
375 | */ | |
b423cd4c | 376 | |
7cf5915e | 377 | while (*ptr && !_cups_isspace(*ptr)) |
20fbc903 MS |
378 | { |
379 | if (*ptr == '\\' && ptr[1]) | |
380 | _cups_strcpy(ptr, ptr + 1); | |
381 | ||
382 | ptr ++; | |
383 | } | |
b423cd4c | 384 | } |
385 | } | |
386 | ||
20fbc903 MS |
387 | if (*ptr != '\0') |
388 | *ptr++ = '\0'; | |
389 | ||
e07d4801 | 390 | DEBUG_printf(("2cupsParseOptions: value=\"%s\"", value)); |
20fbc903 | 391 | |
b423cd4c | 392 | /* |
393 | * Skip trailing whitespace... | |
394 | */ | |
395 | ||
7cf5915e | 396 | while (_cups_isspace(*ptr)) |
20fbc903 | 397 | ptr ++; |
b423cd4c | 398 | |
399 | /* | |
400 | * Add the string value... | |
401 | */ | |
402 | ||
403 | num_options = cupsAddOption(name, value, num_options, options); | |
404 | } | |
405 | ||
406 | /* | |
407 | * Free the copy of the argument we made and return the number of options | |
408 | * found. | |
409 | */ | |
410 | ||
411 | free(copyarg); | |
412 | ||
e07d4801 | 413 | DEBUG_printf(("1cupsParseOptions: Returning %d", num_options)); |
20fbc903 | 414 | |
b423cd4c | 415 | return (num_options); |
416 | } | |
417 | ||
418 | ||
419 | /* | |
f7deaa1a | 420 | * 'cupsRemoveOption()' - Remove an option from an option array. |
b423cd4c | 421 | * |
f3c17241 | 422 | * @since CUPS 1.2/OS X 10.5@ |
b423cd4c | 423 | */ |
424 | ||
425 | int /* O - New number of options */ | |
426 | cupsRemoveOption( | |
427 | const char *name, /* I - Option name */ | |
428 | int num_options, /* I - Current number of options */ | |
429 | cups_option_t **options) /* IO - Options */ | |
430 | { | |
431 | int i; /* Looping var */ | |
432 | cups_option_t *option; /* Current option */ | |
433 | ||
434 | ||
807315e6 | 435 | DEBUG_printf(("2cupsRemoveOption(name=\"%s\", num_options=%d, options=%p)", name, num_options, (void *)options)); |
20fbc903 | 436 | |
b423cd4c | 437 | /* |
438 | * Range check input... | |
439 | */ | |
440 | ||
441 | if (!name || num_options < 1 || !options) | |
20fbc903 | 442 | { |
f11a948a | 443 | DEBUG_printf(("3cupsRemoveOption: Returning %d", num_options)); |
b423cd4c | 444 | return (num_options); |
20fbc903 | 445 | } |
b423cd4c | 446 | |
447 | /* | |
448 | * Loop for the option... | |
449 | */ | |
450 | ||
451 | for (i = num_options, option = *options; i > 0; i --, option ++) | |
88f9aafc | 452 | if (!_cups_strcasecmp(name, option->name)) |
b423cd4c | 453 | break; |
454 | ||
455 | if (i) | |
456 | { | |
457 | /* | |
458 | * Remove this option from the array... | |
459 | */ | |
460 | ||
f11a948a | 461 | DEBUG_puts("4cupsRemoveOption: Found option, removing it..."); |
20fbc903 | 462 | |
b423cd4c | 463 | num_options --; |
464 | i --; | |
465 | ||
2e4ff8af MS |
466 | _cupsStrFree(option->name); |
467 | _cupsStrFree(option->value); | |
b423cd4c | 468 | |
469 | if (i > 0) | |
7e86f2f6 | 470 | memmove(option, option + 1, (size_t)i * sizeof(cups_option_t)); |
b423cd4c | 471 | } |
472 | ||
473 | /* | |
474 | * Return the new number of options... | |
475 | */ | |
476 | ||
f11a948a | 477 | DEBUG_printf(("3cupsRemoveOption: Returning %d", num_options)); |
b423cd4c | 478 | return (num_options); |
479 | } | |
480 | ||
481 | ||
f8b3a85b MS |
482 | /* |
483 | * '_cupsGet1284Values()' - Get 1284 device ID keys and values. | |
484 | * | |
485 | * The returned dictionary is a CUPS option array that can be queried with | |
486 | * cupsGetOption and freed with cupsFreeOptions. | |
487 | */ | |
488 | ||
489 | int /* O - Number of key/value pairs */ | |
490 | _cupsGet1284Values( | |
491 | const char *device_id, /* I - IEEE-1284 device ID string */ | |
492 | cups_option_t **values) /* O - Array of key/value pairs */ | |
493 | { | |
494 | int num_values; /* Number of values */ | |
495 | char key[256], /* Key string */ | |
496 | value[256], /* Value string */ | |
497 | *ptr; /* Pointer into key/value */ | |
498 | ||
499 | ||
500 | /* | |
501 | * Range check input... | |
502 | */ | |
503 | ||
504 | if (values) | |
505 | *values = NULL; | |
506 | ||
507 | if (!device_id || !values) | |
508 | return (0); | |
509 | ||
510 | /* | |
511 | * Parse the 1284 device ID value into keys and values. The format is | |
512 | * repeating sequences of: | |
513 | * | |
514 | * [whitespace]key:value[whitespace]; | |
515 | */ | |
516 | ||
517 | num_values = 0; | |
518 | while (*device_id) | |
519 | { | |
7cf5915e | 520 | while (_cups_isspace(*device_id)) |
f8b3a85b MS |
521 | device_id ++; |
522 | ||
523 | if (!*device_id) | |
524 | break; | |
525 | ||
526 | for (ptr = key; *device_id && *device_id != ':'; device_id ++) | |
527 | if (ptr < (key + sizeof(key) - 1)) | |
528 | *ptr++ = *device_id; | |
529 | ||
530 | if (!*device_id) | |
531 | break; | |
532 | ||
7cf5915e | 533 | while (ptr > key && _cups_isspace(ptr[-1])) |
f8b3a85b MS |
534 | ptr --; |
535 | ||
536 | *ptr = '\0'; | |
537 | device_id ++; | |
538 | ||
7cf5915e | 539 | while (_cups_isspace(*device_id)) |
f8b3a85b MS |
540 | device_id ++; |
541 | ||
542 | if (!*device_id) | |
543 | break; | |
544 | ||
545 | for (ptr = value; *device_id && *device_id != ';'; device_id ++) | |
546 | if (ptr < (value + sizeof(value) - 1)) | |
547 | *ptr++ = *device_id; | |
548 | ||
549 | if (!*device_id) | |
550 | break; | |
551 | ||
7cf5915e | 552 | while (ptr > value && _cups_isspace(ptr[-1])) |
f8b3a85b MS |
553 | ptr --; |
554 | ||
555 | *ptr = '\0'; | |
556 | device_id ++; | |
557 | ||
558 | num_values = cupsAddOption(key, value, num_values, values); | |
559 | } | |
560 | ||
561 | return (num_values); | |
562 | } | |
563 | ||
564 | ||
09a101d6 | 565 | /* |
426c6a59 MS |
566 | * 'cups_compare_options()' - Compare two options. |
567 | */ | |
568 | ||
569 | static int /* O - Result of comparison */ | |
570 | cups_compare_options(cups_option_t *a, /* I - First option */ | |
571 | cups_option_t *b) /* I - Second option */ | |
572 | { | |
88f9aafc | 573 | return (_cups_strcasecmp(a->name, b->name)); |
426c6a59 MS |
574 | } |
575 | ||
576 | ||
577 | /* | |
578 | * 'cups_find_option()' - Find an option using a binary search. | |
579 | */ | |
580 | ||
581 | static int /* O - Index of match */ | |
582 | cups_find_option( | |
583 | const char *name, /* I - Option name */ | |
584 | int num_options, /* I - Number of options */ | |
585 | cups_option_t *options, /* I - Options */ | |
586 | int prev, /* I - Previous index */ | |
587 | int *rdiff) /* O - Difference of match */ | |
588 | { | |
589 | int left, /* Low mark for binary search */ | |
590 | right, /* High mark for binary search */ | |
591 | current, /* Current index */ | |
592 | diff; /* Result of comparison */ | |
593 | cups_option_t key; /* Search key */ | |
594 | ||
595 | ||
807315e6 | 596 | DEBUG_printf(("7cups_find_option(name=\"%s\", num_options=%d, options=%p, prev=%d, rdiff=%p)", name, num_options, (void *)options, prev, (void *)rdiff)); |
426c6a59 MS |
597 | |
598 | #ifdef DEBUG | |
599 | for (left = 0; left < num_options; left ++) | |
e07d4801 | 600 | DEBUG_printf(("9cups_find_option: options[%d].name=\"%s\", .value=\"%s\"", |
426c6a59 MS |
601 | left, options[left].name, options[left].value)); |
602 | #endif /* DEBUG */ | |
603 | ||
604 | key.name = (char *)name; | |
605 | ||
606 | if (prev >= 0) | |
607 | { | |
608 | /* | |
609 | * Start search on either side of previous... | |
610 | */ | |
611 | ||
612 | if ((diff = cups_compare_options(&key, options + prev)) == 0 || | |
613 | (diff < 0 && prev == 0) || | |
614 | (diff > 0 && prev == (num_options - 1))) | |
615 | { | |
616 | *rdiff = diff; | |
617 | return (prev); | |
618 | } | |
619 | else if (diff < 0) | |
620 | { | |
621 | /* | |
622 | * Start with previous on right side... | |
623 | */ | |
624 | ||
625 | left = 0; | |
626 | right = prev; | |
627 | } | |
628 | else | |
629 | { | |
630 | /* | |
631 | * Start wih previous on left side... | |
632 | */ | |
633 | ||
634 | left = prev; | |
635 | right = num_options - 1; | |
636 | } | |
637 | } | |
638 | else | |
639 | { | |
640 | /* | |
641 | * Start search in the middle... | |
642 | */ | |
643 | ||
644 | left = 0; | |
645 | right = num_options - 1; | |
646 | } | |
647 | ||
648 | do | |
649 | { | |
650 | current = (left + right) / 2; | |
651 | diff = cups_compare_options(&key, options + current); | |
652 | ||
653 | if (diff == 0) | |
654 | break; | |
655 | else if (diff < 0) | |
656 | right = current; | |
657 | else | |
658 | left = current; | |
659 | } | |
660 | while ((right - left) > 1); | |
661 | ||
662 | if (diff != 0) | |
663 | { | |
664 | /* | |
665 | * Check the last 1 or 2 elements... | |
666 | */ | |
667 | ||
668 | if ((diff = cups_compare_options(&key, options + left)) <= 0) | |
669 | current = left; | |
670 | else | |
671 | { | |
672 | diff = cups_compare_options(&key, options + right); | |
673 | current = right; | |
674 | } | |
675 | } | |
676 | ||
677 | /* | |
678 | * Return the closest destination and the difference... | |
679 | */ | |
680 | ||
681 | *rdiff = diff; | |
682 | ||
683 | return (current); | |
684 | } |