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[perl #117727] Document B::PADLIST
[perl5.git] / locale.c
CommitLineData
98994639
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1/* locale.c
2 *
1129b882
NC
3 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 * 2002, 2003, 2005, 2006, 2007, 2008 by Larry Wall and others
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5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
4ac71550 12 * A Elbereth Gilthoniel,
cdad3b53 13 * silivren penna míriel
4ac71550 14 * o menel aglar elenath!
cdad3b53 15 * Na-chaered palan-díriel
4ac71550
TC
16 * o galadhremmin ennorath,
17 * Fanuilos, le linnathon
18 * nef aear, si nef aearon!
19 *
20 * [p.238 of _The Lord of the Rings_, II/i: "Many Meetings"]
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21 */
22
166f8a29
DM
23/* utility functions for handling locale-specific stuff like what
24 * character represents the decimal point.
25 */
26
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27#include "EXTERN.h"
28#define PERL_IN_LOCALE_C
29#include "perl.h"
30
b310b053
JH
31#ifdef I_LANGINFO
32# include <langinfo.h>
33#endif
34
a4af207c
JH
35#include "reentr.h"
36
27da23d5 37#if defined(USE_LOCALE_NUMERIC) || defined(USE_LOCALE_COLLATE)
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38/*
39 * Standardize the locale name from a string returned by 'setlocale'.
40 *
41 * The standard return value of setlocale() is either
42 * (1) "xx_YY" if the first argument of setlocale() is not LC_ALL
43 * (2) "xa_YY xb_YY ..." if the first argument of setlocale() is LC_ALL
44 * (the space-separated values represent the various sublocales,
486ec47a 45 * in some unspecified order)
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46 *
47 * In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n",
48 * which is harmful for further use of the string in setlocale().
49 *
50 */
51STATIC char *
52S_stdize_locale(pTHX_ char *locs)
53{
7452cf6a 54 const char * const s = strchr(locs, '=');
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55 bool okay = TRUE;
56
7918f24d
NC
57 PERL_ARGS_ASSERT_STDIZE_LOCALE;
58
8772537c
AL
59 if (s) {
60 const char * const t = strchr(s, '.');
98994639 61 okay = FALSE;
8772537c
AL
62 if (t) {
63 const char * const u = strchr(t, '\n');
64 if (u && (u[1] == 0)) {
65 const STRLEN len = u - s;
66 Move(s + 1, locs, len, char);
67 locs[len] = 0;
68 okay = TRUE;
98994639
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69 }
70 }
71 }
72
73 if (!okay)
74 Perl_croak(aTHX_ "Can't fix broken locale name \"%s\"", locs);
75
76 return locs;
77}
27da23d5 78#endif
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79
80void
81Perl_set_numeric_radix(pTHX)
82{
83#ifdef USE_LOCALE_NUMERIC
97aff369 84 dVAR;
98994639 85# ifdef HAS_LOCALECONV
7452cf6a 86 const struct lconv* const lc = localeconv();
98994639 87
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88 if (lc && lc->decimal_point) {
89 if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) {
90 SvREFCNT_dec(PL_numeric_radix_sv);
a0714e2c 91 PL_numeric_radix_sv = NULL;
98994639
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92 }
93 else {
94 if (PL_numeric_radix_sv)
95 sv_setpv(PL_numeric_radix_sv, lc->decimal_point);
96 else
97 PL_numeric_radix_sv = newSVpv(lc->decimal_point, 0);
98 }
99 }
100 else
a0714e2c 101 PL_numeric_radix_sv = NULL;
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102# endif /* HAS_LOCALECONV */
103#endif /* USE_LOCALE_NUMERIC */
104}
105
106/*
107 * Set up for a new numeric locale.
108 */
109void
8772537c 110Perl_new_numeric(pTHX_ const char *newnum)
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111{
112#ifdef USE_LOCALE_NUMERIC
97aff369 113 dVAR;
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114
115 if (! newnum) {
43c5f42d
NC
116 Safefree(PL_numeric_name);
117 PL_numeric_name = NULL;
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118 PL_numeric_standard = TRUE;
119 PL_numeric_local = TRUE;
120 return;
121 }
122
123 if (! PL_numeric_name || strNE(PL_numeric_name, newnum)) {
124 Safefree(PL_numeric_name);
125 PL_numeric_name = stdize_locale(savepv(newnum));
770526c1
NC
126 PL_numeric_standard = ((*newnum == 'C' && newnum[1] == '\0')
127 || strEQ(newnum, "POSIX"));
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128 PL_numeric_local = TRUE;
129 set_numeric_radix();
130 }
131
132#endif /* USE_LOCALE_NUMERIC */
133}
134
135void
136Perl_set_numeric_standard(pTHX)
137{
138#ifdef USE_LOCALE_NUMERIC
97aff369 139 dVAR;
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140
141 if (! PL_numeric_standard) {
142 setlocale(LC_NUMERIC, "C");
143 PL_numeric_standard = TRUE;
144 PL_numeric_local = FALSE;
145 set_numeric_radix();
146 }
147
148#endif /* USE_LOCALE_NUMERIC */
149}
150
151void
152Perl_set_numeric_local(pTHX)
153{
154#ifdef USE_LOCALE_NUMERIC
97aff369 155 dVAR;
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156
157 if (! PL_numeric_local) {
158 setlocale(LC_NUMERIC, PL_numeric_name);
159 PL_numeric_standard = FALSE;
160 PL_numeric_local = TRUE;
161 set_numeric_radix();
162 }
163
164#endif /* USE_LOCALE_NUMERIC */
165}
166
167/*
168 * Set up for a new ctype locale.
169 */
170void
8772537c 171Perl_new_ctype(pTHX_ const char *newctype)
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172{
173#ifdef USE_LOCALE_CTYPE
27da23d5 174 dVAR;
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175 int i;
176
7918f24d
NC
177 PERL_ARGS_ASSERT_NEW_CTYPE;
178
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179 for (i = 0; i < 256; i++) {
180 if (isUPPER_LC(i))
181 PL_fold_locale[i] = toLOWER_LC(i);
182 else if (isLOWER_LC(i))
183 PL_fold_locale[i] = toUPPER_LC(i);
184 else
185 PL_fold_locale[i] = i;
186 }
187
188#endif /* USE_LOCALE_CTYPE */
7918f24d 189 PERL_ARGS_ASSERT_NEW_CTYPE;
8772537c 190 PERL_UNUSED_ARG(newctype);
96a5add6 191 PERL_UNUSED_CONTEXT;
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192}
193
194/*
195 * Set up for a new collation locale.
196 */
197void
8772537c 198Perl_new_collate(pTHX_ const char *newcoll)
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199{
200#ifdef USE_LOCALE_COLLATE
97aff369 201 dVAR;
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202
203 if (! newcoll) {
204 if (PL_collation_name) {
205 ++PL_collation_ix;
206 Safefree(PL_collation_name);
207 PL_collation_name = NULL;
208 }
209 PL_collation_standard = TRUE;
210 PL_collxfrm_base = 0;
211 PL_collxfrm_mult = 2;
212 return;
213 }
214
215 if (! PL_collation_name || strNE(PL_collation_name, newcoll)) {
216 ++PL_collation_ix;
217 Safefree(PL_collation_name);
218 PL_collation_name = stdize_locale(savepv(newcoll));
770526c1
NC
219 PL_collation_standard = ((*newcoll == 'C' && newcoll[1] == '\0')
220 || strEQ(newcoll, "POSIX"));
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221
222 {
223 /* 2: at most so many chars ('a', 'b'). */
224 /* 50: surely no system expands a char more. */
225#define XFRMBUFSIZE (2 * 50)
226 char xbuf[XFRMBUFSIZE];
8772537c
AL
227 const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
228 const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
229 const SSize_t mult = fb - fa;
e0601d3c 230 if (mult < 1 && !(fa == 0 && fb == 0))
ad49ad39
NC
231 Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
232 (UV) fa, (UV) fb);
eb160463 233 PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;
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234 PL_collxfrm_mult = mult;
235 }
236 }
237
238#endif /* USE_LOCALE_COLLATE */
239}
240
241/*
242 * Initialize locale awareness.
243 */
244int
245Perl_init_i18nl10n(pTHX_ int printwarn)
246{
247 int ok = 1;
248 /* returns
249 * 1 = set ok or not applicable,
250 * 0 = fallback to C locale,
251 * -1 = fallback to C locale failed
252 */
253
254#if defined(USE_LOCALE)
97aff369 255 dVAR;
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256
257#ifdef USE_LOCALE_CTYPE
258 char *curctype = NULL;
259#endif /* USE_LOCALE_CTYPE */
260#ifdef USE_LOCALE_COLLATE
261 char *curcoll = NULL;
262#endif /* USE_LOCALE_COLLATE */
263#ifdef USE_LOCALE_NUMERIC
264 char *curnum = NULL;
265#endif /* USE_LOCALE_NUMERIC */
266#ifdef __GLIBC__
7452cf6a 267 char * const language = PerlEnv_getenv("LANGUAGE");
98994639 268#endif
7452cf6a
AL
269 char * const lc_all = PerlEnv_getenv("LC_ALL");
270 char * const lang = PerlEnv_getenv("LANG");
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271 bool setlocale_failure = FALSE;
272
273#ifdef LOCALE_ENVIRON_REQUIRED
274
275 /*
276 * Ultrix setlocale(..., "") fails if there are no environment
277 * variables from which to get a locale name.
278 */
279
280 bool done = FALSE;
281
282#ifdef LC_ALL
283 if (lang) {
284 if (setlocale(LC_ALL, ""))
285 done = TRUE;
286 else
287 setlocale_failure = TRUE;
288 }
289 if (!setlocale_failure) {
290#ifdef USE_LOCALE_CTYPE
56279a21 291 Safefree(curctype);
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292 if (! (curctype =
293 setlocale(LC_CTYPE,
294 (!done && (lang || PerlEnv_getenv("LC_CTYPE")))
bd61b366 295 ? "" : NULL)))
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296 setlocale_failure = TRUE;
297 else
298 curctype = savepv(curctype);
299#endif /* USE_LOCALE_CTYPE */
300#ifdef USE_LOCALE_COLLATE
56279a21 301 Safefree(curcoll);
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302 if (! (curcoll =
303 setlocale(LC_COLLATE,
304 (!done && (lang || PerlEnv_getenv("LC_COLLATE")))
bd61b366 305 ? "" : NULL)))
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306 setlocale_failure = TRUE;
307 else
308 curcoll = savepv(curcoll);
309#endif /* USE_LOCALE_COLLATE */
310#ifdef USE_LOCALE_NUMERIC
56279a21 311 Safefree(curnum);
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312 if (! (curnum =
313 setlocale(LC_NUMERIC,
314 (!done && (lang || PerlEnv_getenv("LC_NUMERIC")))
bd61b366 315 ? "" : NULL)))
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316 setlocale_failure = TRUE;
317 else
318 curnum = savepv(curnum);
319#endif /* USE_LOCALE_NUMERIC */
320 }
321
322#endif /* LC_ALL */
323
324#endif /* !LOCALE_ENVIRON_REQUIRED */
325
326#ifdef LC_ALL
327 if (! setlocale(LC_ALL, ""))
328 setlocale_failure = TRUE;
329#endif /* LC_ALL */
330
331 if (!setlocale_failure) {
332#ifdef USE_LOCALE_CTYPE
6cb43dbf 333 Safefree(curctype);
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334 if (! (curctype = setlocale(LC_CTYPE, "")))
335 setlocale_failure = TRUE;
336 else
337 curctype = savepv(curctype);
338#endif /* USE_LOCALE_CTYPE */
339#ifdef USE_LOCALE_COLLATE
6cb43dbf 340 Safefree(curcoll);
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341 if (! (curcoll = setlocale(LC_COLLATE, "")))
342 setlocale_failure = TRUE;
343 else
344 curcoll = savepv(curcoll);
345#endif /* USE_LOCALE_COLLATE */
346#ifdef USE_LOCALE_NUMERIC
6cb43dbf 347 Safefree(curnum);
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348 if (! (curnum = setlocale(LC_NUMERIC, "")))
349 setlocale_failure = TRUE;
350 else
351 curnum = savepv(curnum);
352#endif /* USE_LOCALE_NUMERIC */
353 }
354
355 if (setlocale_failure) {
356 char *p;
0bd48802 357 const bool locwarn = (printwarn > 1 ||
98994639
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358 (printwarn &&
359 (!(p = PerlEnv_getenv("PERL_BADLANG")) || atoi(p))));
360
361 if (locwarn) {
362#ifdef LC_ALL
363
364 PerlIO_printf(Perl_error_log,
365 "perl: warning: Setting locale failed.\n");
366
367#else /* !LC_ALL */
368
369 PerlIO_printf(Perl_error_log,
370 "perl: warning: Setting locale failed for the categories:\n\t");
371#ifdef USE_LOCALE_CTYPE
372 if (! curctype)
373 PerlIO_printf(Perl_error_log, "LC_CTYPE ");
374#endif /* USE_LOCALE_CTYPE */
375#ifdef USE_LOCALE_COLLATE
376 if (! curcoll)
377 PerlIO_printf(Perl_error_log, "LC_COLLATE ");
378#endif /* USE_LOCALE_COLLATE */
379#ifdef USE_LOCALE_NUMERIC
380 if (! curnum)
381 PerlIO_printf(Perl_error_log, "LC_NUMERIC ");
382#endif /* USE_LOCALE_NUMERIC */
383 PerlIO_printf(Perl_error_log, "\n");
384
385#endif /* LC_ALL */
386
387 PerlIO_printf(Perl_error_log,
388 "perl: warning: Please check that your locale settings:\n");
389
390#ifdef __GLIBC__
391 PerlIO_printf(Perl_error_log,
392 "\tLANGUAGE = %c%s%c,\n",
393 language ? '"' : '(',
394 language ? language : "unset",
395 language ? '"' : ')');
396#endif
397
398 PerlIO_printf(Perl_error_log,
399 "\tLC_ALL = %c%s%c,\n",
400 lc_all ? '"' : '(',
401 lc_all ? lc_all : "unset",
402 lc_all ? '"' : ')');
403
404#if defined(USE_ENVIRON_ARRAY)
405 {
406 char **e;
407 for (e = environ; *e; e++) {
408 if (strnEQ(*e, "LC_", 3)
409 && strnNE(*e, "LC_ALL=", 7)
410 && (p = strchr(*e, '=')))
411 PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n",
412 (int)(p - *e), *e, p + 1);
413 }
414 }
415#else
416 PerlIO_printf(Perl_error_log,
417 "\t(possibly more locale environment variables)\n");
418#endif
419
420 PerlIO_printf(Perl_error_log,
421 "\tLANG = %c%s%c\n",
422 lang ? '"' : '(',
423 lang ? lang : "unset",
424 lang ? '"' : ')');
425
426 PerlIO_printf(Perl_error_log,
427 " are supported and installed on your system.\n");
428 }
429
430#ifdef LC_ALL
431
432 if (setlocale(LC_ALL, "C")) {
433 if (locwarn)
434 PerlIO_printf(Perl_error_log,
435 "perl: warning: Falling back to the standard locale (\"C\").\n");
436 ok = 0;
437 }
438 else {
439 if (locwarn)
440 PerlIO_printf(Perl_error_log,
441 "perl: warning: Failed to fall back to the standard locale (\"C\").\n");
442 ok = -1;
443 }
444
445#else /* ! LC_ALL */
446
447 if (0
448#ifdef USE_LOCALE_CTYPE
449 || !(curctype || setlocale(LC_CTYPE, "C"))
450#endif /* USE_LOCALE_CTYPE */
451#ifdef USE_LOCALE_COLLATE
452 || !(curcoll || setlocale(LC_COLLATE, "C"))
453#endif /* USE_LOCALE_COLLATE */
454#ifdef USE_LOCALE_NUMERIC
455 || !(curnum || setlocale(LC_NUMERIC, "C"))
456#endif /* USE_LOCALE_NUMERIC */
457 )
458 {
459 if (locwarn)
460 PerlIO_printf(Perl_error_log,
461 "perl: warning: Cannot fall back to the standard locale (\"C\").\n");
462 ok = -1;
463 }
464
465#endif /* ! LC_ALL */
466
467#ifdef USE_LOCALE_CTYPE
56279a21 468 Safefree(curctype);
bd61b366 469 curctype = savepv(setlocale(LC_CTYPE, NULL));
98994639
HS
470#endif /* USE_LOCALE_CTYPE */
471#ifdef USE_LOCALE_COLLATE
56279a21 472 Safefree(curcoll);
bd61b366 473 curcoll = savepv(setlocale(LC_COLLATE, NULL));
98994639
HS
474#endif /* USE_LOCALE_COLLATE */
475#ifdef USE_LOCALE_NUMERIC
56279a21 476 Safefree(curnum);
bd61b366 477 curnum = savepv(setlocale(LC_NUMERIC, NULL));
98994639
HS
478#endif /* USE_LOCALE_NUMERIC */
479 }
480 else {
481
482#ifdef USE_LOCALE_CTYPE
483 new_ctype(curctype);
484#endif /* USE_LOCALE_CTYPE */
485
486#ifdef USE_LOCALE_COLLATE
487 new_collate(curcoll);
488#endif /* USE_LOCALE_COLLATE */
489
490#ifdef USE_LOCALE_NUMERIC
491 new_numeric(curnum);
492#endif /* USE_LOCALE_NUMERIC */
b310b053 493
98994639
HS
494 }
495
496#endif /* USE_LOCALE */
497
ec71e770 498#ifdef USE_PERLIO
b310b053 499 {
fde18df1 500 /* Set PL_utf8locale to TRUE if using PerlIO _and_
ec71e770 501 any of the following are true:
085a54d9 502 - nl_langinfo(CODESET) contains /^utf-?8/i
61de9fb5 503 - $ENV{LC_ALL} contains /^utf-?8/i
085a54d9 504 - $ENV{LC_CTYPE} contains /^utf-?8/i
61de9fb5
JH
505 - $ENV{LANG} contains /^utf-?8/i
506 The LC_ALL, LC_CTYPE, LANG obey the usual override
507 hierarchy of locale environment variables. (LANGUAGE
508 affects only LC_MESSAGES only under glibc.) (If present,
509 it overrides LC_MESSAGES for GNU gettext, and it also
510 can have more than one locale, separated by spaces,
511 in case you need to know.)
8aa8f774 512 If PL_utf8locale and PL_unicode (set by -C or by $ENV{PERL_UNICODE})
a05d7ebb 513 are true, perl.c:S_parse_body() will turn on the PerlIO :utf8 layer
fde18df1 514 on STDIN, STDOUT, STDERR, _and_ the default open discipline.
085a54d9 515 */
fde18df1 516 bool utf8locale = FALSE;
b310b053
JH
517 char *codeset = NULL;
518#if defined(HAS_NL_LANGINFO) && defined(CODESET)
519 codeset = nl_langinfo(CODESET);
520#endif
61de9fb5 521 if (codeset)
e6226b18
KW
522 utf8locale = (foldEQ(codeset, STR_WITH_LEN("UTF-8"))
523 || foldEQ(codeset, STR_WITH_LEN("UTF8") ));
077a72a9 524#if defined(USE_LOCALE)
61de9fb5
JH
525 else { /* nl_langinfo(CODESET) is supposed to correctly
526 * interpret the locale environment variables,
527 * but just in case it fails, let's do this manually. */
528 if (lang)
e6226b18
KW
529 utf8locale = (foldEQ(lang, STR_WITH_LEN("UTF-8"))
530 || foldEQ(lang, STR_WITH_LEN("UTF8") ));
b310b053 531#ifdef USE_LOCALE_CTYPE
61de9fb5 532 if (curctype)
e6226b18
KW
533 utf8locale = (foldEQ(curctype, STR_WITH_LEN("UTF-8"))
534 || foldEQ(curctype, STR_WITH_LEN("UTF8") ));
b310b053 535#endif
61de9fb5 536 if (lc_all)
e6226b18
KW
537 utf8locale = (foldEQ(lc_all, STR_WITH_LEN("UTF-8"))
538 || foldEQ(lc_all, STR_WITH_LEN("UTF8") ));
61de9fb5 539 }
fde18df1
JH
540#endif /* USE_LOCALE */
541 if (utf8locale)
542 PL_utf8locale = TRUE;
543 }
a05d7ebb 544 /* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO.
fde18df1
JH
545 This is an alternative to using the -C command line switch
546 (the -C if present will override this). */
547 {
dd374669 548 const char *p = PerlEnv_getenv("PERL_UNICODE");
a05d7ebb 549 PL_unicode = p ? parse_unicode_opts(&p) : 0;
5a22a2bb
NC
550 if (PL_unicode & PERL_UNICODE_UTF8CACHEASSERT_FLAG)
551 PL_utf8cache = -1;
b310b053 552 }
ec71e770 553#endif
b310b053 554
98994639 555#ifdef USE_LOCALE_CTYPE
43c5f42d 556 Safefree(curctype);
98994639
HS
557#endif /* USE_LOCALE_CTYPE */
558#ifdef USE_LOCALE_COLLATE
43c5f42d 559 Safefree(curcoll);
98994639
HS
560#endif /* USE_LOCALE_COLLATE */
561#ifdef USE_LOCALE_NUMERIC
43c5f42d 562 Safefree(curnum);
98994639
HS
563#endif /* USE_LOCALE_NUMERIC */
564 return ok;
565}
566
98994639
HS
567#ifdef USE_LOCALE_COLLATE
568
569/*
570 * mem_collxfrm() is a bit like strxfrm() but with two important
571 * differences. First, it handles embedded NULs. Second, it allocates
572 * a bit more memory than needed for the transformed data itself.
573 * The real transformed data begins at offset sizeof(collationix).
574 * Please see sv_collxfrm() to see how this is used.
575 */
166f8a29 576
98994639
HS
577char *
578Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen)
579{
97aff369 580 dVAR;
98994639
HS
581 char *xbuf;
582 STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */
583
7918f24d
NC
584 PERL_ARGS_ASSERT_MEM_COLLXFRM;
585
98994639
HS
586 /* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
587 /* the +1 is for the terminating NUL. */
588
589 xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1;
a02a5408 590 Newx(xbuf, xAlloc, char);
98994639
HS
591 if (! xbuf)
592 goto bad;
593
594 *(U32*)xbuf = PL_collation_ix;
595 xout = sizeof(PL_collation_ix);
596 for (xin = 0; xin < len; ) {
224e8ef5 597 Size_t xused;
98994639
HS
598
599 for (;;) {
600 xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout);
224e8ef5 601 if (xused >= PERL_INT_MAX)
98994639 602 goto bad;
eb160463 603 if ((STRLEN)xused < xAlloc - xout)
98994639
HS
604 break;
605 xAlloc = (2 * xAlloc) + 1;
606 Renew(xbuf, xAlloc, char);
607 if (! xbuf)
608 goto bad;
609 }
610
611 xin += strlen(s + xin) + 1;
612 xout += xused;
613
614 /* Embedded NULs are understood but silently skipped
615 * because they make no sense in locale collation. */
616 }
617
618 xbuf[xout] = '\0';
619 *xlen = xout - sizeof(PL_collation_ix);
620 return xbuf;
621
622 bad:
623 Safefree(xbuf);
624 *xlen = 0;
625 return NULL;
626}
627
628#endif /* USE_LOCALE_COLLATE */
629
66610fdd
RGS
630/*
631 * Local variables:
632 * c-indentation-style: bsd
633 * c-basic-offset: 4
14d04a33 634 * indent-tabs-mode: nil
66610fdd
RGS
635 * End:
636 *
14d04a33 637 * ex: set ts=8 sts=4 sw=4 et:
37442d52 638 */