summaryrefslogtreecommitdiff
path: root/string/strcoll.c
blob: d88dd860afa43a4fb7a1f0dc0785979bdaf6ffcf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
/* Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Ulrich Drepper <drepper@cygnus.com>, 1995.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <assert.h>
#include <langinfo.h>
#include <locale.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#ifndef STRING_TYPE
# define STRING_TYPE char
# define USTRING_TYPE unsigned char
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
#  define STRCOLL __strcoll_l
# else
#  define STRCOLL strcoll
# endif
# define STRCMP strcmp
# define STRLEN strlen
# define WEIGHT_H "../locale/weight.h"
# define SUFFIX	MB
# define L(arg) arg
#endif

#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b

#include "../locale/localeinfo.h"

#ifndef USE_IN_EXTENDED_LOCALE_MODEL
int
STRCOLL (s1, s2)
     const STRING_TYPE *s1;
     const STRING_TYPE *s2;
#else
int
STRCOLL (s1, s2, l)
     const STRING_TYPE *s1;
     const STRING_TYPE *s2;
     __locale_t l;
#endif
{
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  struct locale_data *current = l->__locales[LC_COLLATE];
  uint_fast32_t nrules = *((const uint32_t *) current->values[_NL_ITEM_INDEX (_NL_COLLATE_NRULES)].string);
#else
  uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
#endif
  /* We don't assign the following values right away since it might be
     unnecessary in case there are no rules.  */
  const unsigned char *rulesets;
  const int32_t *table;
  const USTRING_TYPE *weights;
  const USTRING_TYPE *extra;
  const int32_t *indirect;
  uint_fast32_t pass;
  int result = 0;
  const USTRING_TYPE *us1;
  const USTRING_TYPE *us2;
  size_t s1len;
  size_t s2len;
  int32_t *idx1arr;
  int32_t *idx2arr;
  unsigned char *rule1arr;
  unsigned char *rule2arr;
  size_t idx1max;
  size_t idx2max;
  size_t idx1cnt;
  size_t idx2cnt;
  size_t idx1now;
  size_t idx2now;
  size_t backw1_stop;
  size_t backw2_stop;
  size_t backw1;
  size_t backw2;
  int val1;
  int val2;
  int position;
  int seq1len;
  int seq2len;
  int use_malloc;

#include WEIGHT_H

  if (nrules == 0)
    return STRCMP (s1, s2);

#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  rulesets = (const unsigned char *)
    current->values[_NL_ITEM_INDEX (_NL_COLLATE_RULESETS)].string;
  table = (const int32_t *)
    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_TABLE,SUFFIX))].string;
  weights = (const USTRING_TYPE *)
    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_WEIGHT,SUFFIX))].string;
  extra = (const USTRING_TYPE *)
    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_EXTRA,SUFFIX))].string;
  indirect = (const int32_t *)
    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_INDIRECT,SUFFIX))].string;
#else
  rulesets = (const unsigned char *)
    _NL_CURRENT (LC_COLLATE, _NL_COLLATE_RULESETS);
  table = (const int32_t *)
    _NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_TABLE,SUFFIX));
  weights = (const USTRING_TYPE *)
    _NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_WEIGHT,SUFFIX));
  extra = (const USTRING_TYPE *)
    _NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_EXTRA,SUFFIX));
  indirect = (const int32_t *)
    _NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_INDIRECT,SUFFIX));
#endif
  use_malloc = 0;

  assert (((uintptr_t) table) % __alignof__ (table[0]) == 0);
  assert (((uintptr_t) weights) % __alignof__ (weights[0]) == 0);
  assert (((uintptr_t) extra) % __alignof__ (extra[0]) == 0);
  assert (((uintptr_t) indirect) % __alignof__ (indirect[0]) == 0);

  /* We need this a few times.  */
  s1len = STRLEN (s1);
  s2len = STRLEN (s2);

  /* We need the elements of the strings as unsigned values since they
     are used as indeces.  */
  us1 = (const USTRING_TYPE *) s1;
  us2 = (const USTRING_TYPE *) s2;

  /* Perform the first pass over the string and while doing this find
     and store the weights for each character.  Since we want this to
     be as fast as possible we are using `alloca' to store the temporary
     values.  But since there is no limit on the length of the string
     we have to use `malloc' if the string is too long.  We should be
     very conservative here.

     Please note that the localedef programs makes sure that `position'
     is not used at the first level.  */
  if (s1len + s2len >= 16384)
    {
      idx1arr = (int32_t *) malloc ((s1len + s2len) * (sizeof (int32_t) + 1));
      idx2arr = &idx1arr[s1len];
      rule1arr = (unsigned char *) &idx2arr[s2len];
      rule2arr = &rule1arr[s1len];

      if (idx1arr == NULL)
	/* No memory.  Well, go with the stack then.

	   XXX Once this implementation is stable we will handle this
	   differently.  Instead of precomputing the indeces we will
	   do this in time.  This means, though, that this happens for
	   every pass again.  */
	goto try_stack;
      use_malloc = 1;
    }
  else
    {
    try_stack:
      idx1arr = (int32_t *) alloca (s1len * sizeof (int32_t));
      idx2arr = (int32_t *) alloca (s2len * sizeof (int32_t));
      rule1arr = (unsigned char *) alloca (s1len);
      rule2arr = (unsigned char *) alloca (s2len);
    }

  idx1cnt = 0;
  idx2cnt = 0;
  idx1max = 0;
  idx2max = 0;
  idx1now = 0;
  idx2now = 0;
  backw1_stop = ~0ul;
  backw2_stop = ~0ul;
  backw1 = ~0ul;
  backw2 = ~0ul;
  seq1len = 0;
  seq2len = 0;
  position = rulesets[0] & sort_position;
  while (1)
    {
      val1 = 0;
      val2 = 0;

      /* Get the next non-IGNOREd element for string `s1'.  */
      if (seq1len == 0)
	do
	  {
	    ++val1;

	    if (backw1_stop != ~0ul)
	      {
		/* The is something pushed.  */
		if (backw1 == backw1_stop)
		  {
		    /* The last pushed character was handled.  Continue
		       with forward characters.  */
		    if (idx1cnt < idx1max)
		      idx1now = idx1cnt;
		    else
		      /* Nothing anymore.  The backward sequence ended with
			 the last sequence in the string.  Note that seq1len
			 is still zero.  */
		      break;
		  }
		else
		  idx1now = --backw1;
	      }
	    else
	      {
		backw1_stop = idx1max;

		while (*us1 != L('\0'))
		  {
		    int32_t tmp = findidx (&us1);
		    rule1arr[idx1max] = tmp >> 24;
		    idx1arr[idx1max] = tmp & 0xffffff;
		    idx1cnt = idx1max++;

		    if ((rulesets[rule1arr[idx1cnt] * nrules]
			 & sort_backward) == 0)
		      /* No more backward characters to push.  */
		      break;
		    ++idx1cnt;
		  }

		if (backw1_stop >= idx1cnt)
		  {
		    /* No sequence at all or just one.  */
		    if (idx1cnt == idx1max || backw1_stop > idx1cnt)
		      /* Note that seq1len is still zero.  */
		      break;

		    backw1_stop = ~0ul;
		    idx1now = idx1cnt;
		  }
		else
		  /* We pushed backward sequences.  */
		  idx1now = backw1 = idx1cnt - 1;
	      }
	  }
	while ((seq1len = weights[idx1arr[idx1now]++]) == 0);

      /* And the same for string `s2'.  */
      if (seq2len == 0)
	do
	  {
	    ++val2;

	    if (backw2_stop != ~0ul)
	      {
		/* The is something pushed.  */
		if (backw2 == backw2_stop)
		  {
		    /* The last pushed character was handled.  Continue
		       with forward characters.  */
		    if (idx2cnt < idx2max)
		      idx2now = idx2cnt;
		    else
		      /* Nothing anymore.  The backward sequence ended with
			 the last sequence in the string.  Note that seq2len
			 is still zero.  */
		      break;
		  }
		else
		  idx2now = --backw2;
	      }
	    else
	      {
		backw2_stop = idx2max;

		while (*us2 != L('\0'))
		  {
		    int32_t tmp = findidx (&us2);
		    rule2arr[idx2max] = tmp >> 24;
		    idx2arr[idx2max] = tmp & 0xffffff;
		    idx2cnt = idx2max++;

		    if ((rulesets[rule2arr[idx2cnt] * nrules]
			 & sort_backward) == 0)
		      /* No more backward characters to push.  */
		      break;
		    ++idx2cnt;
		  }

		if (backw2_stop >= idx2cnt)
		  {
		    /* No sequence at all or just one.  */
		    if (idx2cnt == idx2max || backw2_stop > idx2cnt)
		      /* Note that seq1len is still zero.  */
		      break;

		    backw2_stop = ~0ul;
		    idx2now = idx2cnt;
		  }
		else
		  /* We pushed backward sequences.  */
		  idx2now = backw2 = idx2cnt - 1;
	      }
	  }
	while ((seq2len = weights[idx2arr[idx2now]++]) == 0);

      /* See whether any or both strings are empty.  */
      if (seq1len == 0 || seq2len == 0)
	{
	  if (seq1len == seq2len)
	    /* Both ended.  So far so good, both strings are equal at the
	       first level.  */
	    break;

	  /* This means one string is shorter than the other.  Find out
	     which one and return an appropriate value.  */
	  result = seq1len == 0 ? -1 : 1;
	  goto free_and_return;
	}

      /* Test for position if necessary.  */
      if (position && val1 != val2)
	{
	  result = val1 - val2;
	  goto free_and_return;
	}

      /* Compare the two sequences.  */
      do
	{
	  if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])
	    {
	      /* The sequences differ.  */
	      result = weights[idx1arr[idx1now]] - weights[idx2arr[idx2now]];
	      goto free_and_return;
	    }

	  /* Increment the offsets.  */
	  ++idx1arr[idx1now];
	  ++idx2arr[idx2now];

	  --seq1len;
	  --seq2len;
	}
      while (seq1len > 0 && seq2len > 0);

      if (position && seq1len != seq2len)
	{
	  result = seq1len - seq2len;
	  goto free_and_return;
	}
    }

  /* Now the remaining passes over the weights.  We now use the
     indeces we found before.  */
  for (pass = 1; pass < nrules; ++pass)
    {
      /* We assume that if a rule has defined `position' in one section
	 this is true for all of them.  */
      idx1cnt = 0;
      idx2cnt = 0;
      backw1_stop = ~0ul;
      backw2_stop = ~0ul;
      backw1 = ~0ul;
      backw2 = ~0ul;
      position = rulesets[rule1arr[0] * nrules + pass] & sort_position;

      while (1)
	{
	  val1 = 0;
	  val2 = 0;

	  /* Get the next non-IGNOREd element for string `s1'.  */
	  if (seq1len == 0)
	    do
	      {
		++val1;

		if (backw1_stop != ~0ul)
		  {
		    /* The is something pushed.  */
		    if (backw1 == backw1_stop)
		      {
			/* The last pushed character was handled.  Continue
			   with forward characters.  */
			if (idx1cnt < idx1max)
			  idx1now = idx1cnt;
			else
			  {
			    /* Nothing anymore.  The backward sequence
			       ended with the last sequence in the string.  */
			    idx1now = ~0ul;
			    break;
			  }
		      }
		    else
		      idx1now = --backw1;
		  }
		else
		  {
		    backw1_stop = idx1cnt;

		    while (idx1cnt < idx1max)
		      {
			if ((rulesets[rule1arr[idx1cnt] * nrules + pass]
			     & sort_backward) == 0)
			  /* No more backward characters to push.  */
			  break;
			++idx1cnt;
		      }

		    if (backw1_stop == idx1cnt)
		      {
			/* No sequence at all or just one.  */
			if (idx1cnt == idx1max)
			  /* Note that seq1len is still zero.  */
			  break;

			backw1_stop = ~0ul;
			idx1now = idx1cnt++;
		      }
		    else
		      /* We pushed backward sequences.  */
		      idx1now = backw1 = idx1cnt - 1;
		  }
	      }
	    while ((seq1len = weights[idx1arr[idx1now]++]) == 0);

	  /* And the same for string `s2'.  */
	  if (seq2len == 0)
	    do
	      {
		++val2;

		if (backw2_stop != ~0ul)
		  {
		    /* The is something pushed.  */
		    if (backw2 == backw2_stop)
		      {
			/* The last pushed character was handled.  Continue
			   with forward characters.  */
			if (idx2cnt < idx2max)
			  idx2now = idx2cnt;
			else
			  {
			    /* Nothing anymore.  The backward sequence
			       ended with the last sequence in the string.  */
			    idx2now = ~0ul;
			    break;
			  }
		      }
		    else
		      idx2now = --backw2;
		  }
		else
		  {
		    backw2_stop = idx2cnt;

		    while (idx2cnt < idx2max)
		      {
			if ((rulesets[rule2arr[idx2cnt] * nrules + pass]
			     & sort_backward) == 0)
			  /* No more backward characters to push.  */
			  break;
			++idx2cnt;
		      }

		    if (backw2_stop == idx2cnt)
		      {
			/* No sequence at all or just one.  */
			if (idx2cnt == idx2max)
			  /* Note that seq2len is still zero.  */
			  break;

			backw2_stop = ~0ul;
			idx2now = idx2cnt++;
		      }
		    else
		      /* We pushed backward sequences.  */
		      idx2now = backw2 = idx2cnt - 1;
		  }
	      }
	    while ((seq2len = weights[idx2arr[idx2now]++]) == 0);

	  /* See whether any or both strings are empty.  */
	  if (seq1len == 0 || seq2len == 0)
	    {
	      if (seq1len == seq2len)
		/* Both ended.  So far so good, both strings are equal
		   at this level.  */
		break;

	      /* This means one string is shorter than the other.  Find out
		 which one and return an appropriate value.  */
	      result = seq1len == 0 ? -1 : 1;
	      goto free_and_return;
	    }

	  /* Test for position if necessary.  */
	  if (position && val1 != val2)
	    {
	      result = val1 - val2;
	      goto free_and_return;
	    }

	  /* Compare the two sequences.  */
	  do
	    {
	      if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])
		{
		  /* The sequences differ.  */
		  result = (weights[idx1arr[idx1now]]
			    - weights[idx2arr[idx2now]]);
		  goto free_and_return;
		}

	      /* Increment the offsets.  */
	      ++idx1arr[idx1now];
	      ++idx2arr[idx2now];

	      --seq1len;
	      --seq2len;
	    }
	  while (seq1len > 0 && seq2len > 0);

	  if (position && seq1len != seq2len)
	    {
	      result = seq1len - seq2len;
	      goto free_and_return;
	    }
	}
    }

  /* Free the memory if needed.  */
 free_and_return:
  if (use_malloc)
    free (idx1arr);

  return result;
}