Line data Source code
1 : /*-----------------------------------------------------------------------
2 : *
3 : * PostgreSQL locale utilities
4 : *
5 : * Portions Copyright (c) 2002-2025, PostgreSQL Global Development Group
6 : *
7 : * src/backend/utils/adt/pg_locale.c
8 : *
9 : *-----------------------------------------------------------------------
10 : */
11 :
12 : /*----------
13 : * Here is how the locale stuff is handled: LC_COLLATE and LC_CTYPE
14 : * are fixed at CREATE DATABASE time, stored in pg_database, and cannot
15 : * be changed. Thus, the effects of strcoll(), strxfrm(), isupper(),
16 : * toupper(), etc. are always in the same fixed locale.
17 : *
18 : * LC_MESSAGES is settable at run time and will take effect
19 : * immediately.
20 : *
21 : * The other categories, LC_MONETARY, LC_NUMERIC, and LC_TIME are
22 : * permanently set to "C", and then we use temporary locale_t
23 : * objects when we need to look up locale data based on the GUCs
24 : * of the same name. Information is cached when the GUCs change.
25 : * The cached information is only used by the formatting functions
26 : * (to_char, etc.) and the money type. For the user, this should all be
27 : * transparent.
28 : *----------
29 : */
30 :
31 :
32 : #include "postgres.h"
33 :
34 : #include <time.h>
35 :
36 : #include "access/htup_details.h"
37 : #include "catalog/pg_collation.h"
38 : #include "catalog/pg_database.h"
39 : #include "common/hashfn.h"
40 : #include "common/string.h"
41 : #include "mb/pg_wchar.h"
42 : #include "miscadmin.h"
43 : #include "utils/builtins.h"
44 : #include "utils/formatting.h"
45 : #include "utils/guc_hooks.h"
46 : #include "utils/lsyscache.h"
47 : #include "utils/memutils.h"
48 : #include "utils/pg_locale.h"
49 : #include "utils/relcache.h"
50 : #include "utils/syscache.h"
51 :
52 : #ifdef WIN32
53 : #include <shlwapi.h>
54 : #endif
55 :
56 : /* Error triggered for locale-sensitive subroutines */
57 : #define PGLOCALE_SUPPORT_ERROR(provider) \
58 : elog(ERROR, "unsupported collprovider for %s: %c", __func__, provider)
59 :
60 : /*
61 : * This should be large enough that most strings will fit, but small enough
62 : * that we feel comfortable putting it on the stack
63 : */
64 : #define TEXTBUFLEN 1024
65 :
66 : #define MAX_L10N_DATA 80
67 :
68 : /* pg_locale_builtin.c */
69 : extern pg_locale_t create_pg_locale_builtin(Oid collid, MemoryContext context);
70 : extern char *get_collation_actual_version_builtin(const char *collcollate);
71 :
72 : /* pg_locale_icu.c */
73 : #ifdef USE_ICU
74 : extern UCollator *pg_ucol_open(const char *loc_str);
75 : extern char *get_collation_actual_version_icu(const char *collcollate);
76 : #endif
77 : extern pg_locale_t create_pg_locale_icu(Oid collid, MemoryContext context);
78 :
79 : /* pg_locale_libc.c */
80 : extern pg_locale_t create_pg_locale_libc(Oid collid, MemoryContext context);
81 : extern char *get_collation_actual_version_libc(const char *collcollate);
82 :
83 : extern size_t strlower_builtin(char *dst, size_t dstsize, const char *src,
84 : ssize_t srclen, pg_locale_t locale);
85 : extern size_t strtitle_builtin(char *dst, size_t dstsize, const char *src,
86 : ssize_t srclen, pg_locale_t locale);
87 : extern size_t strupper_builtin(char *dst, size_t dstsize, const char *src,
88 : ssize_t srclen, pg_locale_t locale);
89 : extern size_t strfold_builtin(char *dst, size_t dstsize, const char *src,
90 : ssize_t srclen, pg_locale_t locale);
91 :
92 : extern size_t strlower_icu(char *dst, size_t dstsize, const char *src,
93 : ssize_t srclen, pg_locale_t locale);
94 : extern size_t strtitle_icu(char *dst, size_t dstsize, const char *src,
95 : ssize_t srclen, pg_locale_t locale);
96 : extern size_t strupper_icu(char *dst, size_t dstsize, const char *src,
97 : ssize_t srclen, pg_locale_t locale);
98 : extern size_t strfold_icu(char *dst, size_t dstsize, const char *src,
99 : ssize_t srclen, pg_locale_t locale);
100 :
101 : extern size_t strlower_libc(char *dst, size_t dstsize, const char *src,
102 : ssize_t srclen, pg_locale_t locale);
103 : extern size_t strtitle_libc(char *dst, size_t dstsize, const char *src,
104 : ssize_t srclen, pg_locale_t locale);
105 : extern size_t strupper_libc(char *dst, size_t dstsize, const char *src,
106 : ssize_t srclen, pg_locale_t locale);
107 :
108 : /* GUC settings */
109 : char *locale_messages;
110 : char *locale_monetary;
111 : char *locale_numeric;
112 : char *locale_time;
113 :
114 : int icu_validation_level = WARNING;
115 :
116 : /*
117 : * lc_time localization cache.
118 : *
119 : * We use only the first 7 or 12 entries of these arrays. The last array
120 : * element is left as NULL for the convenience of outside code that wants
121 : * to sequentially scan these arrays.
122 : */
123 : char *localized_abbrev_days[7 + 1];
124 : char *localized_full_days[7 + 1];
125 : char *localized_abbrev_months[12 + 1];
126 : char *localized_full_months[12 + 1];
127 :
128 : /* is the databases's LC_CTYPE the C locale? */
129 : bool database_ctype_is_c = false;
130 :
131 : static pg_locale_t default_locale = NULL;
132 :
133 : /* indicates whether locale information cache is valid */
134 : static bool CurrentLocaleConvValid = false;
135 : static bool CurrentLCTimeValid = false;
136 :
137 : /* Cache for collation-related knowledge */
138 :
139 : typedef struct
140 : {
141 : Oid collid; /* hash key: pg_collation OID */
142 : pg_locale_t locale; /* locale_t struct, or 0 if not valid */
143 :
144 : /* needed for simplehash */
145 : uint32 hash;
146 : char status;
147 : } collation_cache_entry;
148 :
149 : #define SH_PREFIX collation_cache
150 : #define SH_ELEMENT_TYPE collation_cache_entry
151 : #define SH_KEY_TYPE Oid
152 : #define SH_KEY collid
153 : #define SH_HASH_KEY(tb, key) murmurhash32((uint32) key)
154 : #define SH_EQUAL(tb, a, b) (a == b)
155 : #define SH_GET_HASH(tb, a) a->hash
156 : #define SH_SCOPE static inline
157 : #define SH_STORE_HASH
158 : #define SH_DECLARE
159 : #define SH_DEFINE
160 : #include "lib/simplehash.h"
161 :
162 : static MemoryContext CollationCacheContext = NULL;
163 : static collation_cache_hash *CollationCache = NULL;
164 :
165 : /*
166 : * The collation cache is often accessed repeatedly for the same collation, so
167 : * remember the last one used.
168 : */
169 : static Oid last_collation_cache_oid = InvalidOid;
170 : static pg_locale_t last_collation_cache_locale = NULL;
171 :
172 : #if defined(WIN32) && defined(LC_MESSAGES)
173 : static char *IsoLocaleName(const char *);
174 : #endif
175 :
176 : /*
177 : * pg_perm_setlocale
178 : *
179 : * This wraps the libc function setlocale(), with two additions. First, when
180 : * changing LC_CTYPE, update gettext's encoding for the current message
181 : * domain. GNU gettext automatically tracks LC_CTYPE on most platforms, but
182 : * not on Windows. Second, if the operation is successful, the corresponding
183 : * LC_XXX environment variable is set to match. By setting the environment
184 : * variable, we ensure that any subsequent use of setlocale(..., "") will
185 : * preserve the settings made through this routine. Of course, LC_ALL must
186 : * also be unset to fully ensure that, but that has to be done elsewhere after
187 : * all the individual LC_XXX variables have been set correctly. (Thank you
188 : * Perl for making this kluge necessary.)
189 : */
190 : char *
191 103260 : pg_perm_setlocale(int category, const char *locale)
192 : {
193 : char *result;
194 : const char *envvar;
195 :
196 : #ifndef WIN32
197 103260 : result = setlocale(category, locale);
198 : #else
199 :
200 : /*
201 : * On Windows, setlocale(LC_MESSAGES) does not work, so just assume that
202 : * the given value is good and set it in the environment variables. We
203 : * must ignore attempts to set to "", which means "keep using the old
204 : * environment value".
205 : */
206 : #ifdef LC_MESSAGES
207 : if (category == LC_MESSAGES)
208 : {
209 : result = (char *) locale;
210 : if (locale == NULL || locale[0] == '\0')
211 : return result;
212 : }
213 : else
214 : #endif
215 : result = setlocale(category, locale);
216 : #endif /* WIN32 */
217 :
218 103260 : if (result == NULL)
219 0 : return result; /* fall out immediately on failure */
220 :
221 : /*
222 : * Use the right encoding in translated messages. Under ENABLE_NLS, let
223 : * pg_bind_textdomain_codeset() figure it out. Under !ENABLE_NLS, message
224 : * format strings are ASCII, but database-encoding strings may enter the
225 : * message via %s. This makes the overall message encoding equal to the
226 : * database encoding.
227 : */
228 103260 : if (category == LC_CTYPE)
229 : {
230 : static char save_lc_ctype[LOCALE_NAME_BUFLEN];
231 :
232 : /* copy setlocale() return value before callee invokes it again */
233 35530 : strlcpy(save_lc_ctype, result, sizeof(save_lc_ctype));
234 35530 : result = save_lc_ctype;
235 :
236 : #ifdef ENABLE_NLS
237 35530 : SetMessageEncoding(pg_bind_textdomain_codeset(textdomain(NULL)));
238 : #else
239 : SetMessageEncoding(GetDatabaseEncoding());
240 : #endif
241 : }
242 :
243 103260 : switch (category)
244 : {
245 35530 : case LC_COLLATE:
246 35530 : envvar = "LC_COLLATE";
247 35530 : break;
248 35530 : case LC_CTYPE:
249 35530 : envvar = "LC_CTYPE";
250 35530 : break;
251 : #ifdef LC_MESSAGES
252 21058 : case LC_MESSAGES:
253 21058 : envvar = "LC_MESSAGES";
254 : #ifdef WIN32
255 : result = IsoLocaleName(locale);
256 : if (result == NULL)
257 : result = (char *) locale;
258 : elog(DEBUG3, "IsoLocaleName() executed; locale: \"%s\"", result);
259 : #endif /* WIN32 */
260 21058 : break;
261 : #endif /* LC_MESSAGES */
262 3714 : case LC_MONETARY:
263 3714 : envvar = "LC_MONETARY";
264 3714 : break;
265 3714 : case LC_NUMERIC:
266 3714 : envvar = "LC_NUMERIC";
267 3714 : break;
268 3714 : case LC_TIME:
269 3714 : envvar = "LC_TIME";
270 3714 : break;
271 0 : default:
272 0 : elog(FATAL, "unrecognized LC category: %d", category);
273 : return NULL; /* keep compiler quiet */
274 : }
275 :
276 103260 : if (setenv(envvar, result, 1) != 0)
277 0 : return NULL;
278 :
279 103260 : return result;
280 : }
281 :
282 :
283 : /*
284 : * Is the locale name valid for the locale category?
285 : *
286 : * If successful, and canonname isn't NULL, a palloc'd copy of the locale's
287 : * canonical name is stored there. This is especially useful for figuring out
288 : * what locale name "" means (ie, the server environment value). (Actually,
289 : * it seems that on most implementations that's the only thing it's good for;
290 : * we could wish that setlocale gave back a canonically spelled version of
291 : * the locale name, but typically it doesn't.)
292 : */
293 : bool
294 66726 : check_locale(int category, const char *locale, char **canonname)
295 : {
296 : char *save;
297 : char *res;
298 :
299 : /* Don't let Windows' non-ASCII locale names in. */
300 66726 : if (!pg_is_ascii(locale))
301 : {
302 0 : ereport(WARNING,
303 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
304 : errmsg("locale name \"%s\" contains non-ASCII characters",
305 : locale)));
306 0 : return false;
307 : }
308 :
309 66726 : if (canonname)
310 1550 : *canonname = NULL; /* in case of failure */
311 :
312 66726 : save = setlocale(category, NULL);
313 66726 : if (!save)
314 0 : return false; /* won't happen, we hope */
315 :
316 : /* save may be pointing at a modifiable scratch variable, see above. */
317 66726 : save = pstrdup(save);
318 :
319 : /* set the locale with setlocale, to see if it accepts it. */
320 66726 : res = setlocale(category, locale);
321 :
322 : /* save canonical name if requested. */
323 66726 : if (res && canonname)
324 1546 : *canonname = pstrdup(res);
325 :
326 : /* restore old value. */
327 66726 : if (!setlocale(category, save))
328 0 : elog(WARNING, "failed to restore old locale \"%s\"", save);
329 66726 : pfree(save);
330 :
331 : /* Don't let Windows' non-ASCII locale names out. */
332 66726 : if (canonname && *canonname && !pg_is_ascii(*canonname))
333 : {
334 0 : ereport(WARNING,
335 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
336 : errmsg("locale name \"%s\" contains non-ASCII characters",
337 : *canonname)));
338 0 : pfree(*canonname);
339 0 : *canonname = NULL;
340 0 : return false;
341 : }
342 :
343 66726 : return (res != NULL);
344 : }
345 :
346 :
347 : /*
348 : * GUC check/assign hooks
349 : *
350 : * For most locale categories, the assign hook doesn't actually set the locale
351 : * permanently, just reset flags so that the next use will cache the
352 : * appropriate values. (See explanation at the top of this file.)
353 : *
354 : * Note: we accept value = "" as selecting the postmaster's environment
355 : * value, whatever it was (so long as the environment setting is legal).
356 : * This will have been locked down by an earlier call to pg_perm_setlocale.
357 : */
358 : bool
359 17516 : check_locale_monetary(char **newval, void **extra, GucSource source)
360 : {
361 17516 : return check_locale(LC_MONETARY, *newval, NULL);
362 : }
363 :
364 : void
365 17312 : assign_locale_monetary(const char *newval, void *extra)
366 : {
367 17312 : CurrentLocaleConvValid = false;
368 17312 : }
369 :
370 : bool
371 17522 : check_locale_numeric(char **newval, void **extra, GucSource source)
372 : {
373 17522 : return check_locale(LC_NUMERIC, *newval, NULL);
374 : }
375 :
376 : void
377 17324 : assign_locale_numeric(const char *newval, void *extra)
378 : {
379 17324 : CurrentLocaleConvValid = false;
380 17324 : }
381 :
382 : bool
383 17516 : check_locale_time(char **newval, void **extra, GucSource source)
384 : {
385 17516 : return check_locale(LC_TIME, *newval, NULL);
386 : }
387 :
388 : void
389 17312 : assign_locale_time(const char *newval, void *extra)
390 : {
391 17312 : CurrentLCTimeValid = false;
392 17312 : }
393 :
394 : /*
395 : * We allow LC_MESSAGES to actually be set globally.
396 : *
397 : * Note: we normally disallow value = "" because it wouldn't have consistent
398 : * semantics (it'd effectively just use the previous value). However, this
399 : * is the value passed for PGC_S_DEFAULT, so don't complain in that case,
400 : * not even if the attempted setting fails due to invalid environment value.
401 : * The idea there is just to accept the environment setting *if possible*
402 : * during startup, until we can read the proper value from postgresql.conf.
403 : */
404 : bool
405 17550 : check_locale_messages(char **newval, void **extra, GucSource source)
406 : {
407 17550 : if (**newval == '\0')
408 : {
409 4928 : if (source == PGC_S_DEFAULT)
410 4928 : return true;
411 : else
412 0 : return false;
413 : }
414 :
415 : /*
416 : * LC_MESSAGES category does not exist everywhere, but accept it anyway
417 : *
418 : * On Windows, we can't even check the value, so accept blindly
419 : */
420 : #if defined(LC_MESSAGES) && !defined(WIN32)
421 12622 : return check_locale(LC_MESSAGES, *newval, NULL);
422 : #else
423 : return true;
424 : #endif
425 : }
426 :
427 : void
428 17344 : assign_locale_messages(const char *newval, void *extra)
429 : {
430 : /*
431 : * LC_MESSAGES category does not exist everywhere, but accept it anyway.
432 : * We ignore failure, as per comment above.
433 : */
434 : #ifdef LC_MESSAGES
435 17344 : (void) pg_perm_setlocale(LC_MESSAGES, newval);
436 : #endif
437 17344 : }
438 :
439 :
440 : /*
441 : * Frees the malloced content of a struct lconv. (But not the struct
442 : * itself.) It's important that this not throw elog(ERROR).
443 : */
444 : static void
445 6 : free_struct_lconv(struct lconv *s)
446 : {
447 6 : free(s->decimal_point);
448 6 : free(s->thousands_sep);
449 6 : free(s->grouping);
450 6 : free(s->int_curr_symbol);
451 6 : free(s->currency_symbol);
452 6 : free(s->mon_decimal_point);
453 6 : free(s->mon_thousands_sep);
454 6 : free(s->mon_grouping);
455 6 : free(s->positive_sign);
456 6 : free(s->negative_sign);
457 6 : }
458 :
459 : /*
460 : * Check that all fields of a struct lconv (or at least, the ones we care
461 : * about) are non-NULL. The field list must match free_struct_lconv().
462 : */
463 : static bool
464 66 : struct_lconv_is_valid(struct lconv *s)
465 : {
466 66 : if (s->decimal_point == NULL)
467 0 : return false;
468 66 : if (s->thousands_sep == NULL)
469 0 : return false;
470 66 : if (s->grouping == NULL)
471 0 : return false;
472 66 : if (s->int_curr_symbol == NULL)
473 0 : return false;
474 66 : if (s->currency_symbol == NULL)
475 0 : return false;
476 66 : if (s->mon_decimal_point == NULL)
477 0 : return false;
478 66 : if (s->mon_thousands_sep == NULL)
479 0 : return false;
480 66 : if (s->mon_grouping == NULL)
481 0 : return false;
482 66 : if (s->positive_sign == NULL)
483 0 : return false;
484 66 : if (s->negative_sign == NULL)
485 0 : return false;
486 66 : return true;
487 : }
488 :
489 :
490 : /*
491 : * Convert the strdup'd string at *str from the specified encoding to the
492 : * database encoding.
493 : */
494 : static void
495 528 : db_encoding_convert(int encoding, char **str)
496 : {
497 : char *pstr;
498 : char *mstr;
499 :
500 : /* convert the string to the database encoding */
501 528 : pstr = pg_any_to_server(*str, strlen(*str), encoding);
502 528 : if (pstr == *str)
503 528 : return; /* no conversion happened */
504 :
505 : /* need it malloc'd not palloc'd */
506 0 : mstr = strdup(pstr);
507 0 : if (mstr == NULL)
508 0 : ereport(ERROR,
509 : (errcode(ERRCODE_OUT_OF_MEMORY),
510 : errmsg("out of memory")));
511 :
512 : /* replace old string */
513 0 : free(*str);
514 0 : *str = mstr;
515 :
516 0 : pfree(pstr);
517 : }
518 :
519 :
520 : /*
521 : * Return the POSIX lconv struct (contains number/money formatting
522 : * information) with locale information for all categories.
523 : */
524 : struct lconv *
525 2982 : PGLC_localeconv(void)
526 : {
527 : static struct lconv CurrentLocaleConv;
528 : static bool CurrentLocaleConvAllocated = false;
529 : struct lconv *extlconv;
530 : struct lconv tmp;
531 2982 : struct lconv worklconv = {0};
532 :
533 : /* Did we do it already? */
534 2982 : if (CurrentLocaleConvValid)
535 2916 : return &CurrentLocaleConv;
536 :
537 : /* Free any already-allocated storage */
538 66 : if (CurrentLocaleConvAllocated)
539 : {
540 6 : free_struct_lconv(&CurrentLocaleConv);
541 6 : CurrentLocaleConvAllocated = false;
542 : }
543 :
544 : /*
545 : * Use thread-safe method of obtaining a copy of lconv from the operating
546 : * system.
547 : */
548 66 : if (pg_localeconv_r(locale_monetary,
549 : locale_numeric,
550 : &tmp) != 0)
551 0 : elog(ERROR,
552 : "could not get lconv for LC_MONETARY = \"%s\", LC_NUMERIC = \"%s\": %m",
553 : locale_monetary, locale_numeric);
554 :
555 : /* Must copy data now so we can re-encode it. */
556 66 : extlconv = &tmp;
557 66 : worklconv.decimal_point = strdup(extlconv->decimal_point);
558 66 : worklconv.thousands_sep = strdup(extlconv->thousands_sep);
559 66 : worklconv.grouping = strdup(extlconv->grouping);
560 66 : worklconv.int_curr_symbol = strdup(extlconv->int_curr_symbol);
561 66 : worklconv.currency_symbol = strdup(extlconv->currency_symbol);
562 66 : worklconv.mon_decimal_point = strdup(extlconv->mon_decimal_point);
563 66 : worklconv.mon_thousands_sep = strdup(extlconv->mon_thousands_sep);
564 66 : worklconv.mon_grouping = strdup(extlconv->mon_grouping);
565 66 : worklconv.positive_sign = strdup(extlconv->positive_sign);
566 66 : worklconv.negative_sign = strdup(extlconv->negative_sign);
567 : /* Copy scalar fields as well */
568 66 : worklconv.int_frac_digits = extlconv->int_frac_digits;
569 66 : worklconv.frac_digits = extlconv->frac_digits;
570 66 : worklconv.p_cs_precedes = extlconv->p_cs_precedes;
571 66 : worklconv.p_sep_by_space = extlconv->p_sep_by_space;
572 66 : worklconv.n_cs_precedes = extlconv->n_cs_precedes;
573 66 : worklconv.n_sep_by_space = extlconv->n_sep_by_space;
574 66 : worklconv.p_sign_posn = extlconv->p_sign_posn;
575 66 : worklconv.n_sign_posn = extlconv->n_sign_posn;
576 :
577 : /* Free the contents of the object populated by pg_localeconv_r(). */
578 66 : pg_localeconv_free(&tmp);
579 :
580 : /* If any of the preceding strdup calls failed, complain now. */
581 66 : if (!struct_lconv_is_valid(&worklconv))
582 0 : ereport(ERROR,
583 : (errcode(ERRCODE_OUT_OF_MEMORY),
584 : errmsg("out of memory")));
585 :
586 66 : PG_TRY();
587 : {
588 : int encoding;
589 :
590 : /*
591 : * Now we must perform encoding conversion from whatever's associated
592 : * with the locales into the database encoding. If we can't identify
593 : * the encoding implied by LC_NUMERIC or LC_MONETARY (ie we get -1),
594 : * use PG_SQL_ASCII, which will result in just validating that the
595 : * strings are OK in the database encoding.
596 : */
597 66 : encoding = pg_get_encoding_from_locale(locale_numeric, true);
598 66 : if (encoding < 0)
599 0 : encoding = PG_SQL_ASCII;
600 :
601 66 : db_encoding_convert(encoding, &worklconv.decimal_point);
602 66 : db_encoding_convert(encoding, &worklconv.thousands_sep);
603 : /* grouping is not text and does not require conversion */
604 :
605 66 : encoding = pg_get_encoding_from_locale(locale_monetary, true);
606 66 : if (encoding < 0)
607 0 : encoding = PG_SQL_ASCII;
608 :
609 66 : db_encoding_convert(encoding, &worklconv.int_curr_symbol);
610 66 : db_encoding_convert(encoding, &worklconv.currency_symbol);
611 66 : db_encoding_convert(encoding, &worklconv.mon_decimal_point);
612 66 : db_encoding_convert(encoding, &worklconv.mon_thousands_sep);
613 : /* mon_grouping is not text and does not require conversion */
614 66 : db_encoding_convert(encoding, &worklconv.positive_sign);
615 66 : db_encoding_convert(encoding, &worklconv.negative_sign);
616 : }
617 0 : PG_CATCH();
618 : {
619 0 : free_struct_lconv(&worklconv);
620 0 : PG_RE_THROW();
621 : }
622 66 : PG_END_TRY();
623 :
624 : /*
625 : * Everything is good, so save the results.
626 : */
627 66 : CurrentLocaleConv = worklconv;
628 66 : CurrentLocaleConvAllocated = true;
629 66 : CurrentLocaleConvValid = true;
630 66 : return &CurrentLocaleConv;
631 : }
632 :
633 : #ifdef WIN32
634 : /*
635 : * On Windows, strftime() returns its output in encoding CP_ACP (the default
636 : * operating system codepage for the computer), which is likely different
637 : * from SERVER_ENCODING. This is especially important in Japanese versions
638 : * of Windows which will use SJIS encoding, which we don't support as a
639 : * server encoding.
640 : *
641 : * So, instead of using strftime(), use wcsftime() to return the value in
642 : * wide characters (internally UTF16) and then convert to UTF8, which we
643 : * know how to handle directly.
644 : *
645 : * Note that this only affects the calls to strftime() in this file, which are
646 : * used to get the locale-aware strings. Other parts of the backend use
647 : * pg_strftime(), which isn't locale-aware and does not need to be replaced.
648 : */
649 : static size_t
650 : strftime_l_win32(char *dst, size_t dstlen,
651 : const char *format, const struct tm *tm, locale_t locale)
652 : {
653 : size_t len;
654 : wchar_t wformat[8]; /* formats used below need 3 chars */
655 : wchar_t wbuf[MAX_L10N_DATA];
656 :
657 : /*
658 : * Get a wchar_t version of the format string. We only actually use
659 : * plain-ASCII formats in this file, so we can say that they're UTF8.
660 : */
661 : len = MultiByteToWideChar(CP_UTF8, 0, format, -1,
662 : wformat, lengthof(wformat));
663 : if (len == 0)
664 : elog(ERROR, "could not convert format string from UTF-8: error code %lu",
665 : GetLastError());
666 :
667 : len = _wcsftime_l(wbuf, MAX_L10N_DATA, wformat, tm, locale);
668 : if (len == 0)
669 : {
670 : /*
671 : * wcsftime failed, possibly because the result would not fit in
672 : * MAX_L10N_DATA. Return 0 with the contents of dst unspecified.
673 : */
674 : return 0;
675 : }
676 :
677 : len = WideCharToMultiByte(CP_UTF8, 0, wbuf, len, dst, dstlen - 1,
678 : NULL, NULL);
679 : if (len == 0)
680 : elog(ERROR, "could not convert string to UTF-8: error code %lu",
681 : GetLastError());
682 :
683 : dst[len] = '\0';
684 :
685 : return len;
686 : }
687 :
688 : /* redefine strftime_l() */
689 : #define strftime_l(a,b,c,d,e) strftime_l_win32(a,b,c,d,e)
690 : #endif /* WIN32 */
691 :
692 : /*
693 : * Subroutine for cache_locale_time().
694 : * Convert the given string from encoding "encoding" to the database
695 : * encoding, and store the result at *dst, replacing any previous value.
696 : */
697 : static void
698 1748 : cache_single_string(char **dst, const char *src, int encoding)
699 : {
700 : char *ptr;
701 : char *olddst;
702 :
703 : /* Convert the string to the database encoding, or validate it's OK */
704 1748 : ptr = pg_any_to_server(src, strlen(src), encoding);
705 :
706 : /* Store the string in long-lived storage, replacing any previous value */
707 1748 : olddst = *dst;
708 1748 : *dst = MemoryContextStrdup(TopMemoryContext, ptr);
709 1748 : if (olddst)
710 0 : pfree(olddst);
711 :
712 : /* Might as well clean up any palloc'd conversion result, too */
713 1748 : if (ptr != src)
714 0 : pfree(ptr);
715 1748 : }
716 :
717 : /*
718 : * Update the lc_time localization cache variables if needed.
719 : */
720 : void
721 49546 : cache_locale_time(void)
722 : {
723 : char buf[(2 * 7 + 2 * 12) * MAX_L10N_DATA];
724 : char *bufptr;
725 : time_t timenow;
726 : struct tm *timeinfo;
727 : struct tm timeinfobuf;
728 49546 : bool strftimefail = false;
729 : int encoding;
730 : int i;
731 : locale_t locale;
732 :
733 : /* did we do this already? */
734 49546 : if (CurrentLCTimeValid)
735 49500 : return;
736 :
737 46 : elog(DEBUG3, "cache_locale_time() executed; locale: \"%s\"", locale_time);
738 :
739 46 : errno = ENOENT;
740 : #ifdef WIN32
741 : locale = _create_locale(LC_ALL, locale_time);
742 : if (locale == (locale_t) 0)
743 : _dosmaperr(GetLastError());
744 : #else
745 46 : locale = newlocale(LC_ALL_MASK, locale_time, (locale_t) 0);
746 : #endif
747 46 : if (!locale)
748 0 : report_newlocale_failure(locale_time);
749 :
750 : /* We use times close to current time as data for strftime(). */
751 46 : timenow = time(NULL);
752 46 : timeinfo = gmtime_r(&timenow, &timeinfobuf);
753 :
754 : /* Store the strftime results in MAX_L10N_DATA-sized portions of buf[] */
755 46 : bufptr = buf;
756 :
757 : /*
758 : * MAX_L10N_DATA is sufficient buffer space for every known locale, and
759 : * POSIX defines no strftime() errors. (Buffer space exhaustion is not an
760 : * error.) An implementation might report errors (e.g. ENOMEM) by
761 : * returning 0 (or, less plausibly, a negative value) and setting errno.
762 : * Report errno just in case the implementation did that, but clear it in
763 : * advance of the calls so we don't emit a stale, unrelated errno.
764 : */
765 46 : errno = 0;
766 :
767 : /* localized days */
768 368 : for (i = 0; i < 7; i++)
769 : {
770 322 : timeinfo->tm_wday = i;
771 322 : if (strftime_l(bufptr, MAX_L10N_DATA, "%a", timeinfo, locale) <= 0)
772 0 : strftimefail = true;
773 322 : bufptr += MAX_L10N_DATA;
774 322 : if (strftime_l(bufptr, MAX_L10N_DATA, "%A", timeinfo, locale) <= 0)
775 0 : strftimefail = true;
776 322 : bufptr += MAX_L10N_DATA;
777 : }
778 :
779 : /* localized months */
780 598 : for (i = 0; i < 12; i++)
781 : {
782 552 : timeinfo->tm_mon = i;
783 552 : timeinfo->tm_mday = 1; /* make sure we don't have invalid date */
784 552 : if (strftime_l(bufptr, MAX_L10N_DATA, "%b", timeinfo, locale) <= 0)
785 0 : strftimefail = true;
786 552 : bufptr += MAX_L10N_DATA;
787 552 : if (strftime_l(bufptr, MAX_L10N_DATA, "%B", timeinfo, locale) <= 0)
788 0 : strftimefail = true;
789 552 : bufptr += MAX_L10N_DATA;
790 : }
791 :
792 : #ifdef WIN32
793 : _free_locale(locale);
794 : #else
795 46 : freelocale(locale);
796 : #endif
797 :
798 : /*
799 : * At this point we've done our best to clean up, and can throw errors, or
800 : * call functions that might throw errors, with a clean conscience.
801 : */
802 46 : if (strftimefail)
803 0 : elog(ERROR, "strftime_l() failed");
804 :
805 : #ifndef WIN32
806 :
807 : /*
808 : * As in PGLC_localeconv(), we must convert strftime()'s output from the
809 : * encoding implied by LC_TIME to the database encoding. If we can't
810 : * identify the LC_TIME encoding, just perform encoding validation.
811 : */
812 46 : encoding = pg_get_encoding_from_locale(locale_time, true);
813 46 : if (encoding < 0)
814 0 : encoding = PG_SQL_ASCII;
815 :
816 : #else
817 :
818 : /*
819 : * On Windows, strftime_win32() always returns UTF8 data, so convert from
820 : * that if necessary.
821 : */
822 : encoding = PG_UTF8;
823 :
824 : #endif /* WIN32 */
825 :
826 46 : bufptr = buf;
827 :
828 : /* localized days */
829 368 : for (i = 0; i < 7; i++)
830 : {
831 322 : cache_single_string(&localized_abbrev_days[i], bufptr, encoding);
832 322 : bufptr += MAX_L10N_DATA;
833 322 : cache_single_string(&localized_full_days[i], bufptr, encoding);
834 322 : bufptr += MAX_L10N_DATA;
835 : }
836 46 : localized_abbrev_days[7] = NULL;
837 46 : localized_full_days[7] = NULL;
838 :
839 : /* localized months */
840 598 : for (i = 0; i < 12; i++)
841 : {
842 552 : cache_single_string(&localized_abbrev_months[i], bufptr, encoding);
843 552 : bufptr += MAX_L10N_DATA;
844 552 : cache_single_string(&localized_full_months[i], bufptr, encoding);
845 552 : bufptr += MAX_L10N_DATA;
846 : }
847 46 : localized_abbrev_months[12] = NULL;
848 46 : localized_full_months[12] = NULL;
849 :
850 46 : CurrentLCTimeValid = true;
851 : }
852 :
853 :
854 : #if defined(WIN32) && defined(LC_MESSAGES)
855 : /*
856 : * Convert a Windows setlocale() argument to a Unix-style one.
857 : *
858 : * Regardless of platform, we install message catalogs under a Unix-style
859 : * LL[_CC][.ENCODING][@VARIANT] naming convention. Only LC_MESSAGES settings
860 : * following that style will elicit localized interface strings.
861 : *
862 : * Before Visual Studio 2012 (msvcr110.dll), Windows setlocale() accepted "C"
863 : * (but not "c") and strings of the form <Language>[_<Country>][.<CodePage>],
864 : * case-insensitive. setlocale() returns the fully-qualified form; for
865 : * example, setlocale("thaI") returns "Thai_Thailand.874". Internally,
866 : * setlocale() and _create_locale() select a "locale identifier"[1] and store
867 : * it in an undocumented _locale_t field. From that LCID, we can retrieve the
868 : * ISO 639 language and the ISO 3166 country. Character encoding does not
869 : * matter, because the server and client encodings govern that.
870 : *
871 : * Windows Vista introduced the "locale name" concept[2], closely following
872 : * RFC 4646. Locale identifiers are now deprecated. Starting with Visual
873 : * Studio 2012, setlocale() accepts locale names in addition to the strings it
874 : * accepted historically. It does not standardize them; setlocale("Th-tH")
875 : * returns "Th-tH". setlocale(category, "") still returns a traditional
876 : * string. Furthermore, msvcr110.dll changed the undocumented _locale_t
877 : * content to carry locale names instead of locale identifiers.
878 : *
879 : * Visual Studio 2015 should still be able to do the same as Visual Studio
880 : * 2012, but the declaration of locale_name is missing in _locale_t, causing
881 : * this code compilation to fail, hence this falls back instead on to
882 : * enumerating all system locales by using EnumSystemLocalesEx to find the
883 : * required locale name. If the input argument is in Unix-style then we can
884 : * get ISO Locale name directly by using GetLocaleInfoEx() with LCType as
885 : * LOCALE_SNAME.
886 : *
887 : * This function returns a pointer to a static buffer bearing the converted
888 : * name or NULL if conversion fails.
889 : *
890 : * [1] https://docs.microsoft.com/en-us/windows/win32/intl/locale-identifiers
891 : * [2] https://docs.microsoft.com/en-us/windows/win32/intl/locale-names
892 : */
893 :
894 : /*
895 : * Callback function for EnumSystemLocalesEx() in get_iso_localename().
896 : *
897 : * This function enumerates all system locales, searching for one that matches
898 : * an input with the format: <Language>[_<Country>], e.g.
899 : * English[_United States]
900 : *
901 : * The input is a three wchar_t array as an LPARAM. The first element is the
902 : * locale_name we want to match, the second element is an allocated buffer
903 : * where the Unix-style locale is copied if a match is found, and the third
904 : * element is the search status, 1 if a match was found, 0 otherwise.
905 : */
906 : static BOOL CALLBACK
907 : search_locale_enum(LPWSTR pStr, DWORD dwFlags, LPARAM lparam)
908 : {
909 : wchar_t test_locale[LOCALE_NAME_MAX_LENGTH];
910 : wchar_t **argv;
911 :
912 : (void) (dwFlags);
913 :
914 : argv = (wchar_t **) lparam;
915 : *argv[2] = (wchar_t) 0;
916 :
917 : memset(test_locale, 0, sizeof(test_locale));
918 :
919 : /* Get the name of the <Language> in English */
920 : if (GetLocaleInfoEx(pStr, LOCALE_SENGLISHLANGUAGENAME,
921 : test_locale, LOCALE_NAME_MAX_LENGTH))
922 : {
923 : /*
924 : * If the enumerated locale does not have a hyphen ("en") OR the
925 : * locale_name input does not have an underscore ("English"), we only
926 : * need to compare the <Language> tags.
927 : */
928 : if (wcsrchr(pStr, '-') == NULL || wcsrchr(argv[0], '_') == NULL)
929 : {
930 : if (_wcsicmp(argv[0], test_locale) == 0)
931 : {
932 : wcscpy(argv[1], pStr);
933 : *argv[2] = (wchar_t) 1;
934 : return FALSE;
935 : }
936 : }
937 :
938 : /*
939 : * We have to compare a full <Language>_<Country> tag, so we append
940 : * the underscore and name of the country/region in English, e.g.
941 : * "English_United States".
942 : */
943 : else
944 : {
945 : size_t len;
946 :
947 : wcscat(test_locale, L"_");
948 : len = wcslen(test_locale);
949 : if (GetLocaleInfoEx(pStr, LOCALE_SENGLISHCOUNTRYNAME,
950 : test_locale + len,
951 : LOCALE_NAME_MAX_LENGTH - len))
952 : {
953 : if (_wcsicmp(argv[0], test_locale) == 0)
954 : {
955 : wcscpy(argv[1], pStr);
956 : *argv[2] = (wchar_t) 1;
957 : return FALSE;
958 : }
959 : }
960 : }
961 : }
962 :
963 : return TRUE;
964 : }
965 :
966 : /*
967 : * This function converts a Windows locale name to an ISO formatted version
968 : * for Visual Studio 2015 or greater.
969 : *
970 : * Returns NULL, if no valid conversion was found.
971 : */
972 : static char *
973 : get_iso_localename(const char *winlocname)
974 : {
975 : wchar_t wc_locale_name[LOCALE_NAME_MAX_LENGTH];
976 : wchar_t buffer[LOCALE_NAME_MAX_LENGTH];
977 : static char iso_lc_messages[LOCALE_NAME_MAX_LENGTH];
978 : char *period;
979 : int len;
980 : int ret_val;
981 :
982 : /*
983 : * Valid locales have the following syntax:
984 : * <Language>[_<Country>[.<CodePage>]]
985 : *
986 : * GetLocaleInfoEx can only take locale name without code-page and for the
987 : * purpose of this API the code-page doesn't matter.
988 : */
989 : period = strchr(winlocname, '.');
990 : if (period != NULL)
991 : len = period - winlocname;
992 : else
993 : len = pg_mbstrlen(winlocname);
994 :
995 : memset(wc_locale_name, 0, sizeof(wc_locale_name));
996 : memset(buffer, 0, sizeof(buffer));
997 : MultiByteToWideChar(CP_ACP, 0, winlocname, len, wc_locale_name,
998 : LOCALE_NAME_MAX_LENGTH);
999 :
1000 : /*
1001 : * If the lc_messages is already a Unix-style string, we have a direct
1002 : * match with LOCALE_SNAME, e.g. en-US, en_US.
1003 : */
1004 : ret_val = GetLocaleInfoEx(wc_locale_name, LOCALE_SNAME, (LPWSTR) &buffer,
1005 : LOCALE_NAME_MAX_LENGTH);
1006 : if (!ret_val)
1007 : {
1008 : /*
1009 : * Search for a locale in the system that matches language and country
1010 : * name.
1011 : */
1012 : wchar_t *argv[3];
1013 :
1014 : argv[0] = wc_locale_name;
1015 : argv[1] = buffer;
1016 : argv[2] = (wchar_t *) &ret_val;
1017 : EnumSystemLocalesEx(search_locale_enum, LOCALE_WINDOWS, (LPARAM) argv,
1018 : NULL);
1019 : }
1020 :
1021 : if (ret_val)
1022 : {
1023 : size_t rc;
1024 : char *hyphen;
1025 :
1026 : /* Locale names use only ASCII, any conversion locale suffices. */
1027 : rc = wchar2char(iso_lc_messages, buffer, sizeof(iso_lc_messages), NULL);
1028 : if (rc == -1 || rc == sizeof(iso_lc_messages))
1029 : return NULL;
1030 :
1031 : /*
1032 : * Since the message catalogs sit on a case-insensitive filesystem, we
1033 : * need not standardize letter case here. So long as we do not ship
1034 : * message catalogs for which it would matter, we also need not
1035 : * translate the script/variant portion, e.g. uz-Cyrl-UZ to
1036 : * uz_UZ@cyrillic. Simply replace the hyphen with an underscore.
1037 : */
1038 : hyphen = strchr(iso_lc_messages, '-');
1039 : if (hyphen)
1040 : *hyphen = '_';
1041 : return iso_lc_messages;
1042 : }
1043 :
1044 : return NULL;
1045 : }
1046 :
1047 : static char *
1048 : IsoLocaleName(const char *winlocname)
1049 : {
1050 : static char iso_lc_messages[LOCALE_NAME_MAX_LENGTH];
1051 :
1052 : if (pg_strcasecmp("c", winlocname) == 0 ||
1053 : pg_strcasecmp("posix", winlocname) == 0)
1054 : {
1055 : strcpy(iso_lc_messages, "C");
1056 : return iso_lc_messages;
1057 : }
1058 : else
1059 : return get_iso_localename(winlocname);
1060 : }
1061 :
1062 : #endif /* WIN32 && LC_MESSAGES */
1063 :
1064 : /*
1065 : * Create a new pg_locale_t struct for the given collation oid.
1066 : */
1067 : static pg_locale_t
1068 4228 : create_pg_locale(Oid collid, MemoryContext context)
1069 : {
1070 : HeapTuple tp;
1071 : Form_pg_collation collform;
1072 : pg_locale_t result;
1073 : Datum datum;
1074 : bool isnull;
1075 :
1076 4228 : tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
1077 4228 : if (!HeapTupleIsValid(tp))
1078 0 : elog(ERROR, "cache lookup failed for collation %u", collid);
1079 4228 : collform = (Form_pg_collation) GETSTRUCT(tp);
1080 :
1081 4228 : if (collform->collprovider == COLLPROVIDER_BUILTIN)
1082 56 : result = create_pg_locale_builtin(collid, context);
1083 4172 : else if (collform->collprovider == COLLPROVIDER_ICU)
1084 186 : result = create_pg_locale_icu(collid, context);
1085 3986 : else if (collform->collprovider == COLLPROVIDER_LIBC)
1086 3986 : result = create_pg_locale_libc(collid, context);
1087 : else
1088 : /* shouldn't happen */
1089 0 : PGLOCALE_SUPPORT_ERROR(collform->collprovider);
1090 :
1091 4222 : result->is_default = false;
1092 :
1093 : Assert((result->collate_is_c && result->collate == NULL) ||
1094 : (!result->collate_is_c && result->collate != NULL));
1095 :
1096 4222 : datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collversion,
1097 : &isnull);
1098 4222 : if (!isnull)
1099 : {
1100 : char *actual_versionstr;
1101 : char *collversionstr;
1102 :
1103 236 : collversionstr = TextDatumGetCString(datum);
1104 :
1105 236 : if (collform->collprovider == COLLPROVIDER_LIBC)
1106 0 : datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
1107 : else
1108 236 : datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
1109 :
1110 236 : actual_versionstr = get_collation_actual_version(collform->collprovider,
1111 236 : TextDatumGetCString(datum));
1112 236 : if (!actual_versionstr)
1113 : {
1114 : /*
1115 : * This could happen when specifying a version in CREATE COLLATION
1116 : * but the provider does not support versioning, or manually
1117 : * creating a mess in the catalogs.
1118 : */
1119 0 : ereport(ERROR,
1120 : (errmsg("collation \"%s\" has no actual version, but a version was recorded",
1121 : NameStr(collform->collname))));
1122 : }
1123 :
1124 236 : if (strcmp(actual_versionstr, collversionstr) != 0)
1125 0 : ereport(WARNING,
1126 : (errmsg("collation \"%s\" has version mismatch",
1127 : NameStr(collform->collname)),
1128 : errdetail("The collation in the database was created using version %s, "
1129 : "but the operating system provides version %s.",
1130 : collversionstr, actual_versionstr),
1131 : errhint("Rebuild all objects affected by this collation and run "
1132 : "ALTER COLLATION %s REFRESH VERSION, "
1133 : "or build PostgreSQL with the right library version.",
1134 : quote_qualified_identifier(get_namespace_name(collform->collnamespace),
1135 : NameStr(collform->collname)))));
1136 : }
1137 :
1138 4222 : ReleaseSysCache(tp);
1139 :
1140 4222 : return result;
1141 : }
1142 :
1143 : /*
1144 : * Initialize default_locale with database locale settings.
1145 : */
1146 : void
1147 31816 : init_database_collation(void)
1148 : {
1149 : HeapTuple tup;
1150 : Form_pg_database dbform;
1151 : pg_locale_t result;
1152 :
1153 : Assert(default_locale == NULL);
1154 :
1155 : /* Fetch our pg_database row normally, via syscache */
1156 31816 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
1157 31816 : if (!HeapTupleIsValid(tup))
1158 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
1159 31816 : dbform = (Form_pg_database) GETSTRUCT(tup);
1160 :
1161 31816 : if (dbform->datlocprovider == COLLPROVIDER_BUILTIN)
1162 1734 : result = create_pg_locale_builtin(DEFAULT_COLLATION_OID,
1163 : TopMemoryContext);
1164 30082 : else if (dbform->datlocprovider == COLLPROVIDER_ICU)
1165 26 : result = create_pg_locale_icu(DEFAULT_COLLATION_OID,
1166 : TopMemoryContext);
1167 30056 : else if (dbform->datlocprovider == COLLPROVIDER_LIBC)
1168 30056 : result = create_pg_locale_libc(DEFAULT_COLLATION_OID,
1169 : TopMemoryContext);
1170 : else
1171 : /* shouldn't happen */
1172 0 : PGLOCALE_SUPPORT_ERROR(dbform->datlocprovider);
1173 :
1174 31812 : result->is_default = true;
1175 31812 : ReleaseSysCache(tup);
1176 :
1177 31812 : default_locale = result;
1178 31812 : }
1179 :
1180 : /*
1181 : * Create a pg_locale_t from a collation OID. Results are cached for the
1182 : * lifetime of the backend. Thus, do not free the result with freelocale().
1183 : *
1184 : * For simplicity, we always generate COLLATE + CTYPE even though we
1185 : * might only need one of them. Since this is called only once per session,
1186 : * it shouldn't cost much.
1187 : */
1188 : pg_locale_t
1189 28723490 : pg_newlocale_from_collation(Oid collid)
1190 : {
1191 : collation_cache_entry *cache_entry;
1192 : bool found;
1193 :
1194 28723490 : if (collid == DEFAULT_COLLATION_OID)
1195 24811168 : return default_locale;
1196 :
1197 3912322 : if (!OidIsValid(collid))
1198 0 : elog(ERROR, "cache lookup failed for collation %u", collid);
1199 :
1200 3912322 : AssertCouldGetRelation();
1201 :
1202 3912322 : if (last_collation_cache_oid == collid)
1203 3906154 : return last_collation_cache_locale;
1204 :
1205 6168 : if (CollationCache == NULL)
1206 : {
1207 3916 : CollationCacheContext = AllocSetContextCreate(TopMemoryContext,
1208 : "collation cache",
1209 : ALLOCSET_DEFAULT_SIZES);
1210 3916 : CollationCache = collation_cache_create(CollationCacheContext,
1211 : 16, NULL);
1212 : }
1213 :
1214 6168 : cache_entry = collation_cache_insert(CollationCache, collid, &found);
1215 6168 : if (!found)
1216 : {
1217 : /*
1218 : * Make sure cache entry is marked invalid, in case we fail before
1219 : * setting things.
1220 : */
1221 4228 : cache_entry->locale = 0;
1222 : }
1223 :
1224 6168 : if (cache_entry->locale == 0)
1225 : {
1226 4228 : cache_entry->locale = create_pg_locale(collid, CollationCacheContext);
1227 : }
1228 :
1229 6162 : last_collation_cache_oid = collid;
1230 6162 : last_collation_cache_locale = cache_entry->locale;
1231 :
1232 6162 : return cache_entry->locale;
1233 : }
1234 :
1235 : /*
1236 : * Get provider-specific collation version string for the given collation from
1237 : * the operating system/library.
1238 : */
1239 : char *
1240 109170 : get_collation_actual_version(char collprovider, const char *collcollate)
1241 : {
1242 109170 : char *collversion = NULL;
1243 :
1244 109170 : if (collprovider == COLLPROVIDER_BUILTIN)
1245 1866 : collversion = get_collation_actual_version_builtin(collcollate);
1246 : #ifdef USE_ICU
1247 107304 : else if (collprovider == COLLPROVIDER_ICU)
1248 77844 : collversion = get_collation_actual_version_icu(collcollate);
1249 : #endif
1250 29460 : else if (collprovider == COLLPROVIDER_LIBC)
1251 29460 : collversion = get_collation_actual_version_libc(collcollate);
1252 :
1253 109170 : return collversion;
1254 : }
1255 :
1256 : size_t
1257 436430 : pg_strlower(char *dst, size_t dstsize, const char *src, ssize_t srclen,
1258 : pg_locale_t locale)
1259 : {
1260 436430 : if (locale->provider == COLLPROVIDER_BUILTIN)
1261 13022 : return strlower_builtin(dst, dstsize, src, srclen, locale);
1262 : #ifdef USE_ICU
1263 423408 : else if (locale->provider == COLLPROVIDER_ICU)
1264 528 : return strlower_icu(dst, dstsize, src, srclen, locale);
1265 : #endif
1266 422880 : else if (locale->provider == COLLPROVIDER_LIBC)
1267 422880 : return strlower_libc(dst, dstsize, src, srclen, locale);
1268 : else
1269 : /* shouldn't happen */
1270 0 : PGLOCALE_SUPPORT_ERROR(locale->provider);
1271 :
1272 : return 0; /* keep compiler quiet */
1273 : }
1274 :
1275 : size_t
1276 232 : pg_strtitle(char *dst, size_t dstsize, const char *src, ssize_t srclen,
1277 : pg_locale_t locale)
1278 : {
1279 232 : if (locale->provider == COLLPROVIDER_BUILTIN)
1280 194 : return strtitle_builtin(dst, dstsize, src, srclen, locale);
1281 : #ifdef USE_ICU
1282 38 : else if (locale->provider == COLLPROVIDER_ICU)
1283 30 : return strtitle_icu(dst, dstsize, src, srclen, locale);
1284 : #endif
1285 8 : else if (locale->provider == COLLPROVIDER_LIBC)
1286 8 : return strtitle_libc(dst, dstsize, src, srclen, locale);
1287 : else
1288 : /* shouldn't happen */
1289 0 : PGLOCALE_SUPPORT_ERROR(locale->provider);
1290 :
1291 : return 0; /* keep compiler quiet */
1292 : }
1293 :
1294 : size_t
1295 1034780 : pg_strupper(char *dst, size_t dstsize, const char *src, ssize_t srclen,
1296 : pg_locale_t locale)
1297 : {
1298 1034780 : if (locale->provider == COLLPROVIDER_BUILTIN)
1299 316882 : return strupper_builtin(dst, dstsize, src, srclen, locale);
1300 : #ifdef USE_ICU
1301 717898 : else if (locale->provider == COLLPROVIDER_ICU)
1302 54 : return strupper_icu(dst, dstsize, src, srclen, locale);
1303 : #endif
1304 717844 : else if (locale->provider == COLLPROVIDER_LIBC)
1305 717844 : return strupper_libc(dst, dstsize, src, srclen, locale);
1306 : else
1307 : /* shouldn't happen */
1308 0 : PGLOCALE_SUPPORT_ERROR(locale->provider);
1309 :
1310 : return 0; /* keep compiler quiet */
1311 : }
1312 :
1313 : size_t
1314 24 : pg_strfold(char *dst, size_t dstsize, const char *src, ssize_t srclen,
1315 : pg_locale_t locale)
1316 : {
1317 24 : if (locale->provider == COLLPROVIDER_BUILTIN)
1318 12 : return strfold_builtin(dst, dstsize, src, srclen, locale);
1319 : #ifdef USE_ICU
1320 12 : else if (locale->provider == COLLPROVIDER_ICU)
1321 12 : return strfold_icu(dst, dstsize, src, srclen, locale);
1322 : #endif
1323 : /* for libc, just use strlower */
1324 0 : else if (locale->provider == COLLPROVIDER_LIBC)
1325 0 : return strlower_libc(dst, dstsize, src, srclen, locale);
1326 : else
1327 : /* shouldn't happen */
1328 0 : PGLOCALE_SUPPORT_ERROR(locale->provider);
1329 :
1330 : return 0; /* keep compiler quiet */
1331 : }
1332 :
1333 : /*
1334 : * pg_strcoll
1335 : *
1336 : * Like pg_strncoll for NUL-terminated input strings.
1337 : */
1338 : int
1339 24836678 : pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale)
1340 : {
1341 24836678 : return locale->collate->strncoll(arg1, -1, arg2, -1, locale);
1342 : }
1343 :
1344 : /*
1345 : * pg_strncoll
1346 : *
1347 : * Call ucol_strcollUTF8(), ucol_strcoll(), strcoll_l() or wcscoll_l() as
1348 : * appropriate for the given locale, platform, and database encoding. If the
1349 : * locale is not specified, use the database collation.
1350 : *
1351 : * The input strings must be encoded in the database encoding. If an input
1352 : * string is NUL-terminated, its length may be specified as -1.
1353 : *
1354 : * The caller is responsible for breaking ties if the collation is
1355 : * deterministic; this maintains consistency with pg_strnxfrm(), which cannot
1356 : * easily account for deterministic collations.
1357 : */
1358 : int
1359 4453870 : pg_strncoll(const char *arg1, ssize_t len1, const char *arg2, ssize_t len2,
1360 : pg_locale_t locale)
1361 : {
1362 4453870 : return locale->collate->strncoll(arg1, len1, arg2, len2, locale);
1363 : }
1364 :
1365 : /*
1366 : * Return true if the collation provider supports pg_strxfrm() and
1367 : * pg_strnxfrm(); otherwise false.
1368 : *
1369 : *
1370 : * No similar problem is known for the ICU provider.
1371 : */
1372 : bool
1373 45908 : pg_strxfrm_enabled(pg_locale_t locale)
1374 : {
1375 : /*
1376 : * locale->collate->strnxfrm is still a required method, even if it may
1377 : * have the wrong behavior, because the planner uses it for estimates in
1378 : * some cases.
1379 : */
1380 45908 : return locale->collate->strxfrm_is_safe;
1381 : }
1382 :
1383 : /*
1384 : * pg_strxfrm
1385 : *
1386 : * Like pg_strnxfrm for a NUL-terminated input string.
1387 : */
1388 : size_t
1389 144 : pg_strxfrm(char *dest, const char *src, size_t destsize, pg_locale_t locale)
1390 : {
1391 144 : return locale->collate->strnxfrm(dest, destsize, src, -1, locale);
1392 : }
1393 :
1394 : /*
1395 : * pg_strnxfrm
1396 : *
1397 : * Transforms 'src' to a nul-terminated string stored in 'dest' such that
1398 : * ordinary strcmp() on transformed strings is equivalent to pg_strcoll() on
1399 : * untransformed strings.
1400 : *
1401 : * The input string must be encoded in the database encoding. If the input
1402 : * string is NUL-terminated, its length may be specified as -1. If 'destsize'
1403 : * is zero, 'dest' may be NULL.
1404 : *
1405 : * Not all providers support pg_strnxfrm() safely. The caller should check
1406 : * pg_strxfrm_enabled() first, otherwise this function may return wrong
1407 : * results or an error.
1408 : *
1409 : * Returns the number of bytes needed (or more) to store the transformed
1410 : * string, excluding the terminating nul byte. If the value returned is
1411 : * 'destsize' or greater, the resulting contents of 'dest' are undefined.
1412 : */
1413 : size_t
1414 10020 : pg_strnxfrm(char *dest, size_t destsize, const char *src, ssize_t srclen,
1415 : pg_locale_t locale)
1416 : {
1417 10020 : return locale->collate->strnxfrm(dest, destsize, src, srclen, locale);
1418 : }
1419 :
1420 : /*
1421 : * Return true if the collation provider supports pg_strxfrm_prefix() and
1422 : * pg_strnxfrm_prefix(); otherwise false.
1423 : */
1424 : bool
1425 1668 : pg_strxfrm_prefix_enabled(pg_locale_t locale)
1426 : {
1427 1668 : return (locale->collate->strnxfrm_prefix != NULL);
1428 : }
1429 :
1430 : /*
1431 : * pg_strxfrm_prefix
1432 : *
1433 : * Like pg_strnxfrm_prefix for a NUL-terminated input string.
1434 : */
1435 : size_t
1436 1668 : pg_strxfrm_prefix(char *dest, const char *src, size_t destsize,
1437 : pg_locale_t locale)
1438 : {
1439 1668 : return locale->collate->strnxfrm_prefix(dest, destsize, src, -1, locale);
1440 : }
1441 :
1442 : /*
1443 : * pg_strnxfrm_prefix
1444 : *
1445 : * Transforms 'src' to a byte sequence stored in 'dest' such that ordinary
1446 : * memcmp() on the byte sequence is equivalent to pg_strncoll() on
1447 : * untransformed strings. The result is not nul-terminated.
1448 : *
1449 : * The input string must be encoded in the database encoding. If the input
1450 : * string is NUL-terminated, its length may be specified as -1.
1451 : *
1452 : * Not all providers support pg_strnxfrm_prefix() safely. The caller should
1453 : * check pg_strxfrm_prefix_enabled() first, otherwise this function may return
1454 : * wrong results or an error.
1455 : *
1456 : * If destsize is not large enough to hold the resulting byte sequence, stores
1457 : * only the first destsize bytes in 'dest'. Returns the number of bytes
1458 : * actually copied to 'dest'.
1459 : */
1460 : size_t
1461 0 : pg_strnxfrm_prefix(char *dest, size_t destsize, const char *src,
1462 : ssize_t srclen, pg_locale_t locale)
1463 : {
1464 0 : return locale->collate->strnxfrm_prefix(dest, destsize, src, srclen, locale);
1465 : }
1466 :
1467 : /*
1468 : * Return required encoding ID for the given locale, or -1 if any encoding is
1469 : * valid for the locale.
1470 : */
1471 : int
1472 1924 : builtin_locale_encoding(const char *locale)
1473 : {
1474 1924 : if (strcmp(locale, "C") == 0)
1475 62 : return -1;
1476 1862 : else if (strcmp(locale, "C.UTF-8") == 0)
1477 1826 : return PG_UTF8;
1478 36 : else if (strcmp(locale, "PG_UNICODE_FAST") == 0)
1479 36 : return PG_UTF8;
1480 :
1481 :
1482 0 : ereport(ERROR,
1483 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1484 : errmsg("invalid locale name \"%s\" for builtin provider",
1485 : locale)));
1486 :
1487 : return 0; /* keep compiler quiet */
1488 : }
1489 :
1490 :
1491 : /*
1492 : * Validate the locale and encoding combination, and return the canonical form
1493 : * of the locale name.
1494 : */
1495 : const char *
1496 1904 : builtin_validate_locale(int encoding, const char *locale)
1497 : {
1498 1904 : const char *canonical_name = NULL;
1499 : int required_encoding;
1500 :
1501 1904 : if (strcmp(locale, "C") == 0)
1502 50 : canonical_name = "C";
1503 1854 : else if (strcmp(locale, "C.UTF-8") == 0 || strcmp(locale, "C.UTF8") == 0)
1504 1810 : canonical_name = "C.UTF-8";
1505 44 : else if (strcmp(locale, "PG_UNICODE_FAST") == 0)
1506 26 : canonical_name = "PG_UNICODE_FAST";
1507 :
1508 1904 : if (!canonical_name)
1509 18 : ereport(ERROR,
1510 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1511 : errmsg("invalid locale name \"%s\" for builtin provider",
1512 : locale)));
1513 :
1514 1886 : required_encoding = builtin_locale_encoding(canonical_name);
1515 1886 : if (required_encoding >= 0 && encoding != required_encoding)
1516 2 : ereport(ERROR,
1517 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1518 : errmsg("encoding \"%s\" does not match locale \"%s\"",
1519 : pg_encoding_to_char(encoding), locale)));
1520 :
1521 1884 : return canonical_name;
1522 : }
1523 :
1524 :
1525 :
1526 : /*
1527 : * Return the BCP47 language tag representation of the requested locale.
1528 : *
1529 : * This function should be called before passing the string to ucol_open(),
1530 : * because conversion to a language tag also performs "level 2
1531 : * canonicalization". In addition to producing a consistent format, level 2
1532 : * canonicalization is able to more accurately interpret different input
1533 : * locale string formats, such as POSIX and .NET IDs.
1534 : */
1535 : char *
1536 77536 : icu_language_tag(const char *loc_str, int elevel)
1537 : {
1538 : #ifdef USE_ICU
1539 : UErrorCode status;
1540 : char *langtag;
1541 77536 : size_t buflen = 32; /* arbitrary starting buffer size */
1542 77536 : const bool strict = true;
1543 :
1544 : /*
1545 : * A BCP47 language tag doesn't have a clearly-defined upper limit (cf.
1546 : * RFC5646 section 4.4). Additionally, in older ICU versions,
1547 : * uloc_toLanguageTag() doesn't always return the ultimate length on the
1548 : * first call, necessitating a loop.
1549 : */
1550 77536 : langtag = palloc(buflen);
1551 : while (true)
1552 : {
1553 77536 : status = U_ZERO_ERROR;
1554 77536 : uloc_toLanguageTag(loc_str, langtag, buflen, strict, &status);
1555 :
1556 : /* try again if the buffer is not large enough */
1557 77536 : if ((status == U_BUFFER_OVERFLOW_ERROR ||
1558 77536 : status == U_STRING_NOT_TERMINATED_WARNING) &&
1559 : buflen < MaxAllocSize)
1560 : {
1561 0 : buflen = Min(buflen * 2, MaxAllocSize);
1562 0 : langtag = repalloc(langtag, buflen);
1563 0 : continue;
1564 : }
1565 :
1566 77536 : break;
1567 : }
1568 :
1569 77536 : if (U_FAILURE(status))
1570 : {
1571 18 : pfree(langtag);
1572 :
1573 18 : if (elevel > 0)
1574 14 : ereport(elevel,
1575 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1576 : errmsg("could not convert locale name \"%s\" to language tag: %s",
1577 : loc_str, u_errorName(status))));
1578 12 : return NULL;
1579 : }
1580 :
1581 77518 : return langtag;
1582 : #else /* not USE_ICU */
1583 : ereport(ERROR,
1584 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1585 : errmsg("ICU is not supported in this build")));
1586 : return NULL; /* keep compiler quiet */
1587 : #endif /* not USE_ICU */
1588 : }
1589 :
1590 : /*
1591 : * Perform best-effort check that the locale is a valid one.
1592 : */
1593 : void
1594 168 : icu_validate_locale(const char *loc_str)
1595 : {
1596 : #ifdef USE_ICU
1597 : UCollator *collator;
1598 : UErrorCode status;
1599 : char lang[ULOC_LANG_CAPACITY];
1600 168 : bool found = false;
1601 168 : int elevel = icu_validation_level;
1602 :
1603 : /* no validation */
1604 168 : if (elevel < 0)
1605 12 : return;
1606 :
1607 : /* downgrade to WARNING during pg_upgrade */
1608 156 : if (IsBinaryUpgrade && elevel > WARNING)
1609 0 : elevel = WARNING;
1610 :
1611 : /* validate that we can extract the language */
1612 156 : status = U_ZERO_ERROR;
1613 156 : uloc_getLanguage(loc_str, lang, ULOC_LANG_CAPACITY, &status);
1614 156 : if (U_FAILURE(status) || status == U_STRING_NOT_TERMINATED_WARNING)
1615 : {
1616 0 : ereport(elevel,
1617 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1618 : errmsg("could not get language from ICU locale \"%s\": %s",
1619 : loc_str, u_errorName(status)),
1620 : errhint("To disable ICU locale validation, set the parameter \"%s\" to \"%s\".",
1621 : "icu_validation_level", "disabled")));
1622 0 : return;
1623 : }
1624 :
1625 : /* check for special language name */
1626 156 : if (strcmp(lang, "") == 0 ||
1627 46 : strcmp(lang, "root") == 0 || strcmp(lang, "und") == 0)
1628 110 : found = true;
1629 :
1630 : /* search for matching language within ICU */
1631 15706 : for (int32_t i = 0; !found && i < uloc_countAvailable(); i++)
1632 : {
1633 15550 : const char *otherloc = uloc_getAvailable(i);
1634 : char otherlang[ULOC_LANG_CAPACITY];
1635 :
1636 15550 : status = U_ZERO_ERROR;
1637 15550 : uloc_getLanguage(otherloc, otherlang, ULOC_LANG_CAPACITY, &status);
1638 15550 : if (U_FAILURE(status) || status == U_STRING_NOT_TERMINATED_WARNING)
1639 0 : continue;
1640 :
1641 15550 : if (strcmp(lang, otherlang) == 0)
1642 32 : found = true;
1643 : }
1644 :
1645 156 : if (!found)
1646 14 : ereport(elevel,
1647 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1648 : errmsg("ICU locale \"%s\" has unknown language \"%s\"",
1649 : loc_str, lang),
1650 : errhint("To disable ICU locale validation, set the parameter \"%s\" to \"%s\".",
1651 : "icu_validation_level", "disabled")));
1652 :
1653 : /* check that it can be opened */
1654 150 : collator = pg_ucol_open(loc_str);
1655 142 : ucol_close(collator);
1656 : #else /* not USE_ICU */
1657 : /* could get here if a collation was created by a build with ICU */
1658 : ereport(ERROR,
1659 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1660 : errmsg("ICU is not supported in this build")));
1661 : #endif /* not USE_ICU */
1662 : }
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