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[dragonfly.git] / lib / libc / locale / collate.c
1 /*
2  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
3  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
4  *              at Electronni Visti IA, Kiev, Ukraine.
5  *                      All rights reserved.
6  *
7  * Copyright (c) 2011 The FreeBSD Foundation
8  * All rights reserved.
9  * Portions of this software were developed by David Chisnall
10  * under sponsorship from the FreeBSD Foundation.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * Adapted to xlocale by John Marino <draco@marino.st>
34  */
35
36 #include "namespace.h"
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <sys/mman.h>
40 #include <assert.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <wchar.h>
45 #include <errno.h>
46 #include <unistd.h>
47 #include <fcntl.h>
48 #include "un-namespace.h"
49
50 #include "collate.h"
51 #include "setlocale.h"
52 #include "ldpart.h"
53 #include "libc_private.h"
54
55 struct xlocale_collate __xlocale_global_collate = {
56         .header = {{0}, "C"},
57         .__collate_load_error = 1
58 };
59
60 struct xlocale_collate __xlocale_C_collate = {
61         .header = {{0}, "C"},
62         .__collate_load_error = 1
63 };
64
65 static int
66 __collate_load_tables_l(const char *encoding, struct xlocale_collate *table);
67
68 static void
69 destruct_collate(void *t)
70 {
71         struct xlocale_collate *table = t;
72         if (table->map && (table->maplen > 0)) {
73                 (void) munmap(table->map, table->maplen);
74         }
75         free(t);
76 }
77
78 void *
79 __collate_load(const char *encoding, __unused locale_t unused)
80 {
81         if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
82                 return &__xlocale_C_collate;
83         }
84         struct xlocale_collate *table = calloc(sizeof(struct xlocale_collate), 1);
85         table->header.header.destructor = destruct_collate;
86         // FIXME: Make sure that _LDP_CACHE is never returned.  We should be doing
87         // the caching outside of this section
88         if (__collate_load_tables_l(encoding, table) != _LDP_LOADED) {
89                 xlocale_release(table);
90                 return NULL;
91         }
92         return table;
93 }
94
95 /**
96  * Load the collation tables for the specified encoding into the global table.
97  */
98 int
99 __collate_load_tables(const char *encoding)
100 {
101         return (__collate_load_tables_l(encoding, &__xlocale_global_collate));
102 }
103
104 int
105 __collate_load_tables_l(const char *encoding, struct xlocale_collate *table)
106 {
107         int i, chains, z;
108         char buf[PATH_MAX];
109         char *TMP;
110         char *map;
111         collate_info_t *info;
112         struct stat sbuf;
113         int fd;
114
115         table->__collate_load_error = 1;
116
117         /* 'encoding' must be already checked. */
118         if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
119                 return (_LDP_CACHE);
120         }
121
122         (void) snprintf(buf, sizeof (buf), "%s/%s/LC_COLLATE",
123             _PathLocale, encoding);
124
125         if ((fd = _open(buf, O_RDONLY)) < 0)
126                 return (_LDP_ERROR);
127         if (_fstat(fd, &sbuf) < 0) {
128                 (void) _close(fd);
129                 return (_LDP_ERROR);
130         }
131         if (sbuf.st_size < (COLLATE_STR_LEN + sizeof (info))) {
132                 (void) _close(fd);
133                 errno = EINVAL;
134                 return (_LDP_ERROR);
135         }
136         map = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
137         (void) _close(fd);
138         if ((TMP = map) == NULL) {
139                 return (_LDP_ERROR);
140         }
141
142         if (strncmp(TMP, COLLATE_VERSION, COLLATE_STR_LEN) != 0) {
143                 (void) munmap(map, sbuf.st_size);
144                 errno = EINVAL;
145                 return (_LDP_ERROR);
146         }
147         TMP += COLLATE_STR_LEN;
148
149         info = (void *)TMP;
150         TMP += sizeof (*info);
151
152         if ((info->directive_count < 1) ||
153             (info->directive_count >= COLL_WEIGHTS_MAX) ||
154             ((chains = info->chain_count) < 0)) {
155                 (void) munmap(map, sbuf.st_size);
156                 errno = EINVAL;
157                 return (_LDP_ERROR);
158         }
159
160         i = (sizeof (collate_char_t) * (UCHAR_MAX + 1)) +
161             (sizeof (collate_chain_t) * chains) +
162             (sizeof (collate_large_t) * info->large_count);
163         for (z = 0; z < info->directive_count; z++) {
164                 i += sizeof (collate_subst_t) * info->subst_count[z];
165         }
166         if (i != (sbuf.st_size - (TMP - map))) {
167                 (void) munmap(map, sbuf.st_size);
168                 errno = EINVAL;
169                 return (_LDP_ERROR);
170         }
171
172         table->info = info;
173         table->char_pri_table = (void *)TMP;
174         TMP += sizeof (collate_char_t) * (UCHAR_MAX + 1);
175
176         for (z = 0; z < info->directive_count; z++) {
177                 if (info->subst_count[z] > 0) {
178                         table->subst_table[z] = (void *)TMP;
179                         TMP += info->subst_count[z] * sizeof (collate_subst_t);
180                 } else {
181                         table->subst_table[z] = NULL;
182                 }
183         }
184
185         if (chains > 0) {
186                 table->chain_pri_table = (void *)TMP;
187                 TMP += chains * sizeof (collate_chain_t);
188         } else
189                 table->chain_pri_table = NULL;
190         if (info->large_count > 0)
191                 table->large_pri_table = (void *)TMP;
192         else
193                 table->large_pri_table = NULL;
194
195         table->__collate_load_error = 0;
196         return (_LDP_LOADED);
197 }
198
199 static const int32_t *
200 substsearch(struct xlocale_collate *table, const wchar_t key, int pass)
201 {
202         const collate_subst_t *p;
203         int n = table->info->subst_count[pass];
204
205         if (n == 0)
206                 return (NULL);
207
208         if (pass >= table->info->directive_count)
209                 return (NULL);
210
211         if (!(key & COLLATE_SUBST_PRIORITY))
212                 return (NULL);
213
214         p = table->subst_table[pass] + (key & ~COLLATE_SUBST_PRIORITY);
215         assert(p->key == key);
216         return (p->pri);
217 }
218
219 static collate_chain_t *
220 chainsearch(struct xlocale_collate *table, const wchar_t *key, int *len)
221 {
222         int low = 0;
223         int high = table->info->chain_count - 1;;
224         int next, compar, l;
225         collate_chain_t *p;
226         collate_chain_t *tab = table->chain_pri_table;
227
228         if (high < 0)
229                 return (NULL);
230
231         while (low <= high) {
232                 next = (low + high) / 2;
233                 p = tab + next;
234                 compar = *key - *p->str;
235                 if (compar == 0) {
236                         l = wcsnlen(p->str, COLLATE_STR_LEN);
237                         compar = wcsncmp(key, p->str, l);
238                         if (compar == 0) {
239                                 *len = l;
240                                 return (p);
241                         }
242                 }
243                 if (compar > 0)
244                         low = next + 1;
245                 else
246                         high = next - 1;
247         }
248         return (NULL);
249 }
250
251 static collate_large_t *
252 largesearch(struct xlocale_collate *table, const wchar_t key)
253 {
254         int low = 0;
255         int high = table->info->large_count - 1;
256         int next, compar;
257         collate_large_t *p;
258         collate_large_t *tab = table->large_pri_table;
259
260         if (high < 0)
261                 return (NULL);
262
263         while (low <= high) {
264                 next = (low + high) / 2;
265                 p = tab + next;
266                 compar = key - p->val;
267                 if (compar == 0)
268                         return (p);
269                 if (compar > 0)
270                         low = next + 1;
271                 else
272                         high = next - 1;
273         }
274         return (NULL);
275 }
276
277 void
278 _collate_lookup(struct xlocale_collate *table, const wchar_t *t, int *len,
279     int *pri, int which, const int **state)
280 {
281         collate_chain_t *p2;
282         collate_large_t *match;
283         int p, l;
284         const int *sptr;
285
286         /*
287          * If this is the "last" pass for the UNDEFINED, then
288          * we just return the priority itself.
289          */
290         if (which >= table->info->directive_count) {
291                 *pri = *t;
292                 *len = 1;
293                 *state = NULL;
294                 return;
295         }
296
297         /*
298          * If we have remaining substitution data from a previous
299          * call, consume it first.
300          */
301         if ((sptr = *state) != NULL) {
302                 *pri = *sptr;
303                 sptr++;
304                 if ((sptr == *state) || (sptr == NULL))
305                         *state = NULL;
306                 else
307                         *state = sptr;
308                 *len = 0;
309                 return;
310         }
311
312         /* No active substitutions */
313         *len = 1;
314
315         /*
316          * Check for composites such as diphthongs that collate as a
317          * single element (aka chains or collating-elements).
318          */
319         if (((p2 = chainsearch(table, t, &l)) != NULL) &&
320             ((p = p2->pri[which]) >= 0)) {
321
322                 *len = l;
323                 *pri = p;
324
325         } else if (*t <= UCHAR_MAX) {
326
327                 /*
328                  * Character is a small (8-bit) character.
329                  * We just look these up directly for speed.
330                  */
331                 *pri = table->char_pri_table[*t].pri[which];
332
333         } else if ((table->info->large_count > 0) &&
334             ((match = largesearch(table, *t)) != NULL)) {
335
336                 /*
337                  * Character was found in the extended table.
338                  */
339                 *pri = match->pri.pri[which];
340
341         } else {
342                 /*
343                  * Character lacks a specific definition.
344                  */
345                 if (table->info->directive[which] & DIRECTIVE_UNDEFINED) {
346                         /* Mask off sign bit to prevent ordering confusion. */
347                         *pri = (*t & COLLATE_MAX_PRIORITY);
348                 } else {
349                         *pri = table->info->undef_pri[which];
350                 }
351                 /* No substitutions for undefined characters! */
352                 return;
353         }
354
355         /*
356          * Try substituting (expanding) the character.  We are
357          * currently doing this *after* the chain compression.  I
358          * think it should not matter, but this way might be slightly
359          * faster.
360          *
361          * We do this after the priority search, as this will help us
362          * to identify a single key value.  In order for this to work,
363          * its important that the priority assigned to a given element
364          * to be substituted be unique for that level.  The localedef
365          * code ensures this for us.
366          */
367         if ((sptr = substsearch(table, *pri, which)) != NULL) {
368                 if ((*pri = *sptr) > 0) {
369                         sptr++;
370                         *state = *sptr ? sptr : NULL;
371                 }
372         }
373
374 }
375
376 /*
377  * This is the meaty part of wcsxfrm & strxfrm.  Note that it does
378  * NOT NULL terminate.  That is left to the caller.
379  */
380 size_t
381 _collate_wxfrm(struct xlocale_collate *table, const wchar_t *src, wchar_t *xf,
382     size_t room)
383 {
384         int             pri;
385         int             len;
386         const wchar_t   *t;
387         wchar_t         *tr = NULL;
388         int             direc;
389         int             pass;
390         const int32_t   *state;
391         size_t          want = 0;
392         size_t          need = 0;
393         int             ndir = table->info->directive_count;
394
395         assert(src);
396
397         for (pass = 0; pass <= ndir; pass++) {
398
399                 state = NULL;
400
401                 if (pass != 0) {
402                         /* insert level separator from the previous pass */
403                         if (room) {
404                                 *xf++ = 1;
405                                 room--;
406                         }
407                         want++;
408                 }
409
410                 /* special pass for undefined */
411                 if (pass == ndir) {
412                         direc = DIRECTIVE_FORWARD | DIRECTIVE_UNDEFINED;
413                 } else {
414                         direc = table->info->directive[pass];
415                 }
416
417                 t = src;
418
419                 if (direc & DIRECTIVE_BACKWARD) {
420                         wchar_t *bp, *fp, c;
421                         if (tr)
422                                 free(tr);
423                         if ((tr = wcsdup(t)) == NULL) {
424                                 errno = ENOMEM;
425                                 goto fail;
426                         }
427                         bp = tr;
428                         fp = tr + wcslen(tr) - 1;
429                         while (bp < fp) {
430                                 c = *bp;
431                                 *bp++ = *fp;
432                                 *fp-- = c;
433                         }
434                         t = (const wchar_t *)tr;
435                 }
436
437                 if (direc & DIRECTIVE_POSITION) {
438                         while (*t || state) {
439                                 _collate_lookup(table, t, &len, &pri, pass, &state);
440                                 t += len;
441                                 if (pri <= 0) {
442                                         if (pri < 0) {
443                                                 errno = EINVAL;
444                                                 goto fail;
445                                         }
446                                         state = NULL;
447                                         pri = COLLATE_MAX_PRIORITY;
448                                 }
449                                 if (room) {
450                                         *xf++ = pri;
451                                         room--;
452                                 }
453                                 want++;
454                                 need = want;
455                         }
456                 } else {
457                         while (*t || state) {
458                                 _collate_lookup(table, t, &len, &pri, pass, &state);
459                                 t += len;
460                                 if (pri <= 0) {
461                                         if (pri < 0) {
462                                                 errno = EINVAL;
463                                                 goto fail;
464                                         }
465                                         state = NULL;
466                                         continue;
467                                 }
468                                 if (room) {
469                                         *xf++ = pri;
470                                         room--;
471                                 }
472                                 want++;
473                                 need = want;
474                         }
475                 }
476         }
477         free(tr);
478         return (need);
479
480 fail:
481         free(tr);
482         return ((size_t)(-1));
483 }
484
485 /*
486  * In the non-POSIX case, we transform each character into a string of
487  * characters representing the character's priority.  Since char is usually
488  * signed, we are limited by 7 bits per byte.  To avoid zero, we need to add
489  * XFRM_OFFSET, so we can't use a full 7 bits.  For simplicity, we choose 6
490  * bits per byte.
491  *
492  * It turns out that we sometimes have real priorities that are
493  * 31-bits wide.  (But: be careful using priorities where the high
494  * order bit is set -- i.e. the priority is negative.  The sort order
495  * may be surprising!)
496  *
497  * TODO: This would be a good area to optimize somewhat.  It turns out
498  * that real prioririties *except for the last UNDEFINED pass* are generally
499  * very small.  We need the localedef code to precalculate the max
500  * priority for us, and ideally also give us a mask, and then we could
501  * severely limit what we expand to.
502  */
503 #define XFRM_BYTES      6
504 #define XFRM_OFFSET     ('0')   /* make all printable characters */
505 #define XFRM_SHIFT      6
506 #define XFRM_MASK       ((1 << XFRM_SHIFT) - 1)
507 #define XFRM_SEP        ('.')   /* chosen to be less than XFRM_OFFSET */
508
509 static int
510 xfrm(struct xlocale_collate *table, unsigned char *p, int pri, int pass)
511 {
512         /* we use unsigned to ensure zero fill on right shift */
513         uint32_t val = (uint32_t)table->info->pri_count[pass];
514         int nc = 0;
515
516         while (val) {
517                 *p = (pri & XFRM_MASK) + XFRM_OFFSET;
518                 pri >>= XFRM_SHIFT;
519                 val >>= XFRM_SHIFT;
520                 p++;
521                 nc++;
522         }
523         return (nc);
524 }
525
526 size_t
527 _collate_sxfrm(struct xlocale_collate *table, const wchar_t *src, char *xf,
528     size_t room)
529 {
530         int             pri;
531         int             len;
532         const wchar_t   *t;
533         wchar_t         *tr = NULL;
534         int             direc;
535         int             pass;
536         const int32_t   *state;
537         size_t          want = 0;
538         size_t          need = 0;
539         int             b;
540         uint8_t         buf[XFRM_BYTES];
541         int             ndir = table->info->directive_count;
542
543         assert(src);
544
545         for (pass = 0; pass <= ndir; pass++) {
546
547                 state = NULL;
548
549                 if (pass != 0) {
550                         /* insert level separator from the previous pass */
551                         if (room) {
552                                 *xf++ = XFRM_SEP;
553                                 room--;
554                         }
555                         want++;
556                 }
557
558                 /* special pass for undefined */
559                 if (pass == ndir) {
560                         direc = DIRECTIVE_FORWARD | DIRECTIVE_UNDEFINED;
561                 } else {
562                         direc = table->info->directive[pass];
563                 }
564
565                 t = src;
566
567                 if (direc & DIRECTIVE_BACKWARD) {
568                         wchar_t *bp, *fp, c;
569                         if (tr)
570                                 free(tr);
571                         if ((tr = wcsdup(t)) == NULL) {
572                                 errno = ENOMEM;
573                                 goto fail;
574                         }
575                         bp = tr;
576                         fp = tr + wcslen(tr) - 1;
577                         while (bp < fp) {
578                                 c = *bp;
579                                 *bp++ = *fp;
580                                 *fp-- = c;
581                         }
582                         t = (const wchar_t *)tr;
583                 }
584
585                 if (direc & DIRECTIVE_POSITION) {
586                         while (*t || state) {
587
588                                 _collate_lookup(table, t, &len, &pri, pass, &state);
589                                 t += len;
590                                 if (pri <= 0) {
591                                         if (pri < 0) {
592                                                 errno = EINVAL;
593                                                 goto fail;
594                                         }
595                                         state = NULL;
596                                         pri = COLLATE_MAX_PRIORITY;
597                                 }
598
599                                 b = xfrm(table, buf, pri, pass);
600                                 want += b;
601                                 if (room) {
602                                         while (b) {
603                                                 b--;
604                                                 if (room) {
605                                                         *xf++ = buf[b];
606                                                         room--;
607                                                 }
608                                         }
609                                 }
610                                 need = want;
611                         }
612                 } else {
613                         while (*t || state) {
614                                 _collate_lookup(table, t, &len, &pri, pass, &state);
615                                 t += len;
616                                 if (pri <= 0) {
617                                         if (pri < 0) {
618                                                 errno = EINVAL;
619                                                 goto fail;
620                                         }
621                                         state = NULL;
622                                         continue;
623                                 }
624
625                                 b = xfrm(table, buf, pri, pass);
626                                 want += b;
627                                 if (room) {
628
629                                         while (b) {
630                                                 b--;
631                                                 if (room) {
632                                                         *xf++ = buf[b];
633                                                         room--;
634                                                 }
635                                         }
636                                 }
637                                 need = want;
638                         }
639                 }
640         }
641         free(tr);
642         return (need);
643
644 fail:
645         free(tr);
646         return ((size_t)(-1));
647 }
648
649 /*
650  * __collate_equiv_value returns the primary collation value for the given
651  * collating symbol specified by str and len.  Zero or negative is returned
652  * if the collating symbol was not found.  This function is used by bracket
653  * code in the TRE regex library.
654  */
655 int
656 __collate_equiv_value(locale_t locale, const wchar_t *str, size_t len)
657 {
658         int32_t e;
659
660         if (len < 1 || len >= COLLATE_STR_LEN)
661                 return (-1);
662
663         FIX_LOCALE(locale);
664         struct xlocale_collate *table =
665                 (struct xlocale_collate*)locale->components[XLC_COLLATE];
666
667         if (table->__collate_load_error)
668                 return ((len == 1 && *str <= UCHAR_MAX) ? *str : -1);
669
670         if (len == 1) {
671                 e = -1;
672                 if (*str <= UCHAR_MAX)
673                         e = table->char_pri_table[*str].pri[0];
674                 else if (table->info->large_count > 0) {
675                         collate_large_t *match_large;
676                         match_large = largesearch(table, *str);
677                         if (match_large)
678                                 e = match_large->pri.pri[0];
679                 }
680                 if (e == 0)
681                         return (1);
682                 return (e > 0 ? e : 0);
683         }
684         if (table->info->chain_count > 0) {
685                 wchar_t name[COLLATE_STR_LEN];
686                 collate_chain_t *match_chain;
687                 int clen;
688
689                 wcsncpy (name, str, len);
690                 name[len] = 0;
691                 match_chain = chainsearch(table, name, &clen);
692                 if (match_chain) {
693                         e = match_chain->pri[0];
694                         if (e == 0)
695                                 return (1);
696                         return (e < 0 ? -e : e);
697                 }
698         }
699         return (0);
700 }