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locale.c: Fix memory leak.
[perl5.git] / locale.c
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1/* locale.c
2 *
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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
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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
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23/* utility functions for handling locale-specific stuff like what
24 * character represents the decimal point.
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25 *
26 * All C programs have an underlying locale. Perl generally doesn't pay any
27 * attention to it except within the scope of a 'use locale'. For most
28 * categories, it accomplishes this by just using different operations if it is
29 * in such scope than if not. However, various libc functions called by Perl
30 * are affected by the LC_NUMERIC category, so there are macros in perl.h that
31 * are used to toggle between the current locale and the C locale depending on
32 * the desired behavior of those functions at the moment.
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33 */
34
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35#include "EXTERN.h"
36#define PERL_IN_LOCALE_C
37#include "perl.h"
38
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39#ifdef I_LANGINFO
40# include <langinfo.h>
41#endif
42
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43#include "reentr.h"
44
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45#ifdef USE_LOCALE
46
98994639 47/*
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48 * Standardize the locale name from a string returned by 'setlocale', possibly
49 * modifying that string.
98994639 50 *
0ef2a2b2 51 * The typical return value of setlocale() is either
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52 * (1) "xx_YY" if the first argument of setlocale() is not LC_ALL
53 * (2) "xa_YY xb_YY ..." if the first argument of setlocale() is LC_ALL
54 * (the space-separated values represent the various sublocales,
0ef2a2b2 55 * in some unspecified order). This is not handled by this function.
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56 *
57 * In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n",
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58 * which is harmful for further use of the string in setlocale(). This
59 * function removes the trailing new line and everything up through the '='
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60 *
61 */
62STATIC char *
63S_stdize_locale(pTHX_ char *locs)
64{
7452cf6a 65 const char * const s = strchr(locs, '=');
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66 bool okay = TRUE;
67
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68 PERL_ARGS_ASSERT_STDIZE_LOCALE;
69
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70 if (s) {
71 const char * const t = strchr(s, '.');
98994639 72 okay = FALSE;
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73 if (t) {
74 const char * const u = strchr(t, '\n');
75 if (u && (u[1] == 0)) {
76 const STRLEN len = u - s;
77 Move(s + 1, locs, len, char);
78 locs[len] = 0;
79 okay = TRUE;
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80 }
81 }
82 }
83
84 if (!okay)
85 Perl_croak(aTHX_ "Can't fix broken locale name \"%s\"", locs);
86
87 return locs;
88}
89
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90#endif
91
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92void
93Perl_set_numeric_radix(pTHX)
94{
95#ifdef USE_LOCALE_NUMERIC
96# ifdef HAS_LOCALECONV
7452cf6a 97 const struct lconv* const lc = localeconv();
98994639 98
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99 if (lc && lc->decimal_point) {
100 if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) {
101 SvREFCNT_dec(PL_numeric_radix_sv);
a0714e2c 102 PL_numeric_radix_sv = NULL;
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103 }
104 else {
105 if (PL_numeric_radix_sv)
106 sv_setpv(PL_numeric_radix_sv, lc->decimal_point);
107 else
108 PL_numeric_radix_sv = newSVpv(lc->decimal_point, 0);
9f10db87 109 if (! is_invariant_string((U8 *) lc->decimal_point, 0)
28acfe03 110 && is_utf8_string((U8 *) lc->decimal_point, 0)
c1284011 111 && _is_cur_LC_category_utf8(LC_NUMERIC))
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112 {
113 SvUTF8_on(PL_numeric_radix_sv);
114 }
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115 }
116 }
117 else
a0714e2c 118 PL_numeric_radix_sv = NULL;
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119
120 DEBUG_L(PerlIO_printf(Perl_debug_log, "Locale radix is %s\n",
121 (PL_numeric_radix_sv)
122 ? lc->decimal_point
123 : "NULL"));
124
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125# endif /* HAS_LOCALECONV */
126#endif /* USE_LOCALE_NUMERIC */
127}
128
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129/* Is the C string input 'name' "C" or "POSIX"? If so, and 'name' is the
130 * return of setlocale(), then this is extremely likely to be the C or POSIX
131 * locale. However, the output of setlocale() is documented to be opaque, but
132 * the odds are extremely small that it would return these two strings for some
133 * other locale. Note that VMS in these two locales includes many non-ASCII
134 * characters as controls and punctuation (below are hex bytes):
135 * cntrl: 00-1F 7F 84-97 9B-9F
136 * punct: 21-2F 3A-40 5B-60 7B-7E A1-A3 A5 A7-AB B0-B3 B5-B7 B9-BD BF-CF D1-DD DF-EF F1-FD
137 * Oddly, none there are listed as alphas, though some represent alphabetics
138 * http://www.nntp.perl.org/group/perl.perl5.porters/2013/02/msg198753.html */
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139#define isNAME_C_OR_POSIX(name) ((name) != NULL \
140 && ((*(name) == 'C' && (*(name + 1)) == '\0') \
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141 || strEQ((name), "POSIX")))
142
98994639 143void
8772537c 144Perl_new_numeric(pTHX_ const char *newnum)
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145{
146#ifdef USE_LOCALE_NUMERIC
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147
148 /* Called after all libc setlocale() calls affecting LC_NUMERIC, to tell
149 * core Perl this and that 'newnum' is the name of the new locale.
150 * It installs this locale as the current underlying default.
151 *
152 * The default locale and the C locale can be toggled between by use of the
153 * set_numeric_local() and set_numeric_standard() functions, which should
154 * probably not be called directly, but only via macros like
155 * SET_NUMERIC_STANDARD() in perl.h.
156 *
157 * The toggling is necessary mainly so that a non-dot radix decimal point
158 * character can be output, while allowing internal calculations to use a
159 * dot.
160 *
161 * This sets several interpreter-level variables:
bb304765 162 * PL_numeric_name The underlying locale's name: a copy of 'newnum'
0d071d52 163 * PL_numeric_local A boolean indicating if the toggled state is such
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164 * that the current locale is the program's underlying
165 * locale
166 * PL_numeric_standard An int indicating if the toggled state is such
167 * that the current locale is the C locale. If non-zero,
168 * it is in C; if > 1, it means it may not be toggled away
169 * from C.
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170 * Note that both of the last two variables can be true at the same time,
171 * if the underlying locale is C. (Toggling is a no-op under these
172 * circumstances.)
173 *
174 * Any code changing the locale (outside this file) should use
175 * POSIX::setlocale, which calls this function. Therefore this function
176 * should be called directly only from this file and from
177 * POSIX::setlocale() */
178
b03f34cf 179 char *save_newnum;
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180
181 if (! newnum) {
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182 Safefree(PL_numeric_name);
183 PL_numeric_name = NULL;
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184 PL_numeric_standard = TRUE;
185 PL_numeric_local = TRUE;
186 return;
187 }
188
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189 save_newnum = stdize_locale(savepv(newnum));
190 if (! PL_numeric_name || strNE(PL_numeric_name, save_newnum)) {
98994639 191 Safefree(PL_numeric_name);
b03f34cf 192 PL_numeric_name = save_newnum;
b03f34cf 193 }
98994639 194
a39edc4c 195 PL_numeric_standard = isNAME_C_OR_POSIX(save_newnum);
e19f01cb 196 PL_numeric_local = TRUE;
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197
198 /* Keep LC_NUMERIC in the C locale. This is for XS modules, so they don't
199 * have to worry about the radix being a non-dot. (Core operations that
200 * need the underlying locale change to it temporarily). */
201 set_numeric_standard();
202
e19f01cb 203 set_numeric_radix();
6959d69d 204
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205#else
206 PERL_UNUSED_ARG(newnum);
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207#endif /* USE_LOCALE_NUMERIC */
208}
209
210void
211Perl_set_numeric_standard(pTHX)
212{
213#ifdef USE_LOCALE_NUMERIC
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214 /* Toggle the LC_NUMERIC locale to C. Most code should use the macros like
215 * SET_NUMERIC_STANDARD() in perl.h instead of calling this directly. The
216 * macro avoids calling this routine if toggling isn't necessary according
217 * to our records (which could be wrong if some XS code has changed the
218 * locale behind our back) */
0d071d52 219
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220 setlocale(LC_NUMERIC, "C");
221 PL_numeric_standard = TRUE;
222 PL_numeric_local = isNAME_C_OR_POSIX(PL_numeric_name);
223 set_numeric_radix();
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224 DEBUG_L(PerlIO_printf(Perl_debug_log,
225 "Underlying LC_NUMERIC locale now is C\n"));
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226
227#endif /* USE_LOCALE_NUMERIC */
228}
229
230void
231Perl_set_numeric_local(pTHX)
232{
233#ifdef USE_LOCALE_NUMERIC
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234 /* Toggle the LC_NUMERIC locale to the current underlying default. Most
235 * code should use the macros like SET_NUMERIC_LOCAL() in perl.h instead of
236 * calling this directly. The macro avoids calling this routine if
237 * toggling isn't necessary according to our records (which could be wrong
238 * if some XS code has changed the locale behind our back) */
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239
240 setlocale(LC_NUMERIC, PL_numeric_name);
241 PL_numeric_standard = isNAME_C_OR_POSIX(PL_numeric_name);
242 PL_numeric_local = TRUE;
243 set_numeric_radix();
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244 DEBUG_L(PerlIO_printf(Perl_debug_log,
245 "Underlying LC_NUMERIC locale now is %s\n",
246 PL_numeric_name));
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247
248#endif /* USE_LOCALE_NUMERIC */
249}
250
251/*
252 * Set up for a new ctype locale.
253 */
254void
8772537c 255Perl_new_ctype(pTHX_ const char *newctype)
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256{
257#ifdef USE_LOCALE_CTYPE
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258
259 /* Called after all libc setlocale() calls affecting LC_CTYPE, to tell
260 * core Perl this and that 'newctype' is the name of the new locale.
261 *
262 * This function sets up the folding arrays for all 256 bytes, assuming
263 * that tofold() is tolc() since fold case is not a concept in POSIX,
264 *
265 * Any code changing the locale (outside this file) should use
266 * POSIX::setlocale, which calls this function. Therefore this function
267 * should be called directly only from this file and from
268 * POSIX::setlocale() */
269
27da23d5 270 dVAR;
68067e4e 271 UV i;
98994639 272
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273 PERL_ARGS_ASSERT_NEW_CTYPE;
274
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275 /* We will replace any bad locale warning with 1) nothing if the new one is
276 * ok; or 2) a new warning for the bad new locale */
277 if (PL_warn_locale) {
278 SvREFCNT_dec_NN(PL_warn_locale);
279 PL_warn_locale = NULL;
280 }
281
c1284011 282 PL_in_utf8_CTYPE_locale = _is_cur_LC_category_utf8(LC_CTYPE);
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283
284 /* A UTF-8 locale gets standard rules. But note that code still has to
285 * handle this specially because of the three problematic code points */
286 if (PL_in_utf8_CTYPE_locale) {
287 Copy(PL_fold_latin1, PL_fold_locale, 256, U8);
288 }
289 else {
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290 /* Assume enough space for every character being bad. 4 spaces each
291 * for the 94 printable characters that are output like "'x' "; and 5
292 * spaces each for "'\\' ", "'\t' ", and "'\n' "; plus a terminating
293 * NUL */
294 char bad_chars_list[ (94 * 4) + (3 * 5) + 1 ];
295
296 bool check_for_problems = ckWARN_d(WARN_LOCALE); /* No warnings means
297 no check */
298 bool multi_byte_locale = FALSE; /* Assume is a single-byte locale
299 to start */
300 unsigned int bad_count = 0; /* Count of bad characters */
301
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302 for (i = 0; i < 256; i++) {
303 if (isUPPER_LC((U8) i))
304 PL_fold_locale[i] = (U8) toLOWER_LC((U8) i);
305 else if (isLOWER_LC((U8) i))
306 PL_fold_locale[i] = (U8) toUPPER_LC((U8) i);
307 else
308 PL_fold_locale[i] = (U8) i;
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309
310 /* If checking for locale problems, see if the native ASCII-range
311 * printables plus \n and \t are in their expected categories in
312 * the new locale. If not, this could mean big trouble, upending
313 * Perl's and most programs' assumptions, like having a
314 * metacharacter with special meaning become a \w. Fortunately,
315 * it's very rare to find locales that aren't supersets of ASCII
316 * nowadays. It isn't a problem for most controls to be changed
317 * into something else; we check only \n and \t, though perhaps \r
318 * could be an issue as well. */
319 if (check_for_problems
320 && (isGRAPH_A(i) || isBLANK_A(i) || i == '\n'))
321 {
322 if ((isALPHANUMERIC_A(i) && ! isALPHANUMERIC_LC(i))
323 || (isPUNCT_A(i) && ! isPUNCT_LC(i))
324 || (isBLANK_A(i) && ! isBLANK_LC(i))
325 || (i == '\n' && ! isCNTRL_LC(i)))
326 {
327 if (bad_count) { /* Separate multiple entries with a
328 blank */
329 bad_chars_list[bad_count++] = ' ';
330 }
331 bad_chars_list[bad_count++] = '\'';
332 if (isPRINT_A(i)) {
333 bad_chars_list[bad_count++] = (char) i;
334 }
335 else {
336 bad_chars_list[bad_count++] = '\\';
337 if (i == '\n') {
338 bad_chars_list[bad_count++] = 'n';
339 }
340 else {
341 assert(i == '\t');
342 bad_chars_list[bad_count++] = 't';
343 }
344 }
345 bad_chars_list[bad_count++] = '\'';
346 bad_chars_list[bad_count] = '\0';
347 }
348 }
349 }
350
351#ifdef MB_CUR_MAX
352 /* We only handle single-byte locales (outside of UTF-8 ones; so if
353 * this locale requires than one byte, there are going to be
354 * problems. */
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355 if (check_for_problems && MB_CUR_MAX > 1
356
357 /* Some platforms return MB_CUR_MAX > 1 for even the "C"
358 * locale. Just assume that the implementation for them (plus
359 * for POSIX) is correct and the > 1 value is spurious. (Since
360 * these are specially handled to never be considered UTF-8
361 * locales, as long as this is the only problem, everything
362 * should work fine */
363 && strNE(newctype, "C") && strNE(newctype, "POSIX"))
364 {
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365 multi_byte_locale = TRUE;
366 }
367#endif
368
369 if (bad_count || multi_byte_locale) {
780fcc9f 370 PL_warn_locale = Perl_newSVpvf(aTHX_
8c6180a9 371 "Locale '%s' may not work well.%s%s%s\n",
780fcc9f 372 newctype,
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373 (multi_byte_locale)
374 ? " Some characters in it are not recognized by"
375 " Perl."
376 : "",
377 (bad_count)
378 ? "\nThe following characters (and maybe others)"
379 " may not have the same meaning as the Perl"
380 " program expects:\n"
381 : "",
382 (bad_count)
383 ? bad_chars_list
384 : ""
385 );
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386 /* If we are actually in the scope of the locale, output the
387 * message now. Otherwise we save it to be output at the first
388 * operation using this locale, if that actually happens. Most
389 * programs don't use locales, so they are immune to bad ones */
390 if (IN_LC(LC_CTYPE)) {
391
392 /* We have to save 'newctype' because the setlocale() just
393 * below may destroy it. The next setlocale() further down
394 * should restore it properly so that the intermediate change
395 * here is transparent to this function's caller */
396 const char * const badlocale = savepv(newctype);
397
398 setlocale(LC_CTYPE, "C");
399
400 /* The '0' below suppresses a bogus gcc compiler warning */
401 Perl_warner(aTHX_ packWARN(WARN_LOCALE), SvPVX(PL_warn_locale), 0);
402 setlocale(LC_CTYPE, badlocale);
c0f3a893 403 Safefree(badlocale);
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404 SvREFCNT_dec_NN(PL_warn_locale);
405 PL_warn_locale = NULL;
406 }
baa60164 407 }
31f05a37 408 }
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409
410#endif /* USE_LOCALE_CTYPE */
7918f24d 411 PERL_ARGS_ASSERT_NEW_CTYPE;
8772537c 412 PERL_UNUSED_ARG(newctype);
96a5add6 413 PERL_UNUSED_CONTEXT;
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414}
415
98994639 416void
8772537c 417Perl_new_collate(pTHX_ const char *newcoll)
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418{
419#ifdef USE_LOCALE_COLLATE
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420
421 /* Called after all libc setlocale() calls affecting LC_COLLATE, to tell
422 * core Perl this and that 'newcoll' is the name of the new locale.
423 *
424 * Any code changing the locale (outside this file) should use
425 * POSIX::setlocale, which calls this function. Therefore this function
426 * should be called directly only from this file and from
427 * POSIX::setlocale() */
428
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429 if (! newcoll) {
430 if (PL_collation_name) {
431 ++PL_collation_ix;
432 Safefree(PL_collation_name);
433 PL_collation_name = NULL;
434 }
435 PL_collation_standard = TRUE;
436 PL_collxfrm_base = 0;
437 PL_collxfrm_mult = 2;
438 return;
439 }
440
441 if (! PL_collation_name || strNE(PL_collation_name, newcoll)) {
442 ++PL_collation_ix;
443 Safefree(PL_collation_name);
444 PL_collation_name = stdize_locale(savepv(newcoll));
a39edc4c 445 PL_collation_standard = isNAME_C_OR_POSIX(newcoll);
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446
447 {
448 /* 2: at most so many chars ('a', 'b'). */
449 /* 50: surely no system expands a char more. */
450#define XFRMBUFSIZE (2 * 50)
451 char xbuf[XFRMBUFSIZE];
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452 const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
453 const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
454 const SSize_t mult = fb - fa;
e0601d3c 455 if (mult < 1 && !(fa == 0 && fb == 0))
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456 Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
457 (UV) fa, (UV) fb);
eb160463 458 PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;
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459 PL_collxfrm_mult = mult;
460 }
461 }
462
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463#else
464 PERL_UNUSED_ARG(newcoll);
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465#endif /* USE_LOCALE_COLLATE */
466}
467
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468#ifdef WIN32
469
470char *
471Perl_my_setlocale(pTHX_ int category, const char* locale)
472{
473 /* This, for Windows, emulates POSIX setlocale() behavior. There is no
474 * difference unless the input locale is "", which means on Windows to get
475 * the machine default, which is set via the computer's "Regional and
476 * Language Options" (or its current equivalent). In POSIX, it instead
477 * means to find the locale from the user's environment. This routine
478 * looks in the environment, and, if anything is found, uses that instead
479 * of going to the machine default. If there is no environment override,
480 * the machine default is used, as normal, by calling the real setlocale()
481 * with "". The POSIX behavior is to use the LC_ALL variable if set;
482 * otherwise to use the particular category's variable if set; otherwise to
483 * use the LANG variable. */
484
481465ea 485 bool override_LC_ALL = 0;
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486 char * result;
487
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488 if (locale && strEQ(locale, "")) {
489# ifdef LC_ALL
490 locale = PerlEnv_getenv("LC_ALL");
491 if (! locale) {
492#endif
493 switch (category) {
494# ifdef LC_ALL
495 case LC_ALL:
481465ea 496 override_LC_ALL = TRUE;
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497 break; /* We already know its variable isn't set */
498# endif
499# ifdef USE_LOCALE_TIME
500 case LC_TIME:
501 locale = PerlEnv_getenv("LC_TIME");
502 break;
503# endif
504# ifdef USE_LOCALE_CTYPE
505 case LC_CTYPE:
506 locale = PerlEnv_getenv("LC_CTYPE");
507 break;
508# endif
509# ifdef USE_LOCALE_COLLATE
510 case LC_COLLATE:
511 locale = PerlEnv_getenv("LC_COLLATE");
512 break;
513# endif
514# ifdef USE_LOCALE_MONETARY
515 case LC_MONETARY:
516 locale = PerlEnv_getenv("LC_MONETARY");
517 break;
518# endif
519# ifdef USE_LOCALE_NUMERIC
520 case LC_NUMERIC:
521 locale = PerlEnv_getenv("LC_NUMERIC");
522 break;
523# endif
524# ifdef USE_LOCALE_MESSAGES
525 case LC_MESSAGES:
526 locale = PerlEnv_getenv("LC_MESSAGES");
527 break;
528# endif
529 default:
530 /* This is a category, like PAPER_SIZE that we don't
531 * know about; and so can't provide a wrapper. */
532 break;
533 }
534 if (! locale) {
535 locale = PerlEnv_getenv("LANG");
481465ea 536 if (! locale) {
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537 locale = "";
538 }
539 }
540# ifdef LC_ALL
541 }
542# endif
543 }
544
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545 result = setlocale(category, locale);
546
481465ea 547 if (! override_LC_ALL) {
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548 return result;
549 }
550
551 /* Here the input locale was LC_ALL, and we have set it to what is in the
481465ea
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552 * LANG variable or the system default if there is no LANG. But these have
553 * lower priority than the other LC_foo variables, so override it for each
554 * one that is set. (If they are set to "", it means to use the same thing
555 * we just set LC_ALL to, so can skip) */
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556# ifdef USE_LOCALE_TIME
557 result = PerlEnv_getenv("LC_TIME");
730252b2 558 if (result && strNE(result, "")) {
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559 setlocale(LC_TIME, result);
560 }
561# endif
562# ifdef USE_LOCALE_CTYPE
563 result = PerlEnv_getenv("LC_CTYPE");
730252b2 564 if (result && strNE(result, "")) {
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565 setlocale(LC_CTYPE, result);
566 }
567# endif
568# ifdef USE_LOCALE_COLLATE
569 result = PerlEnv_getenv("LC_COLLATE");
730252b2 570 if (result && strNE(result, "")) {
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571 setlocale(LC_COLLATE, result);
572 }
573# endif
574# ifdef USE_LOCALE_MONETARY
575 result = PerlEnv_getenv("LC_MONETARY");
730252b2 576 if (result && strNE(result, "")) {
89f7b9aa
KW
577 setlocale(LC_MONETARY, result);
578 }
579# endif
580# ifdef USE_LOCALE_NUMERIC
581 result = PerlEnv_getenv("LC_NUMERIC");
730252b2 582 if (result && strNE(result, "")) {
89f7b9aa
KW
583 setlocale(LC_NUMERIC, result);
584 }
585# endif
586# ifdef USE_LOCALE_MESSAGES
587 result = PerlEnv_getenv("LC_MESSAGES");
730252b2 588 if (result && strNE(result, "")) {
89f7b9aa
KW
589 setlocale(LC_MESSAGES, result);
590 }
591# endif
592
593 return setlocale(LC_ALL, NULL);
594
b385bb4d
KW
595}
596
597#endif
598
599
98994639
HS
600/*
601 * Initialize locale awareness.
602 */
603int
604Perl_init_i18nl10n(pTHX_ int printwarn)
605{
0e92a118
KW
606 /* printwarn is
607 *
608 * 0 if not to output warning when setup locale is bad
609 * 1 if to output warning based on value of PERL_BADLANG
610 * >1 if to output regardless of PERL_BADLANG
611 *
612 * returns
98994639 613 * 1 = set ok or not applicable,
0e92a118
KW
614 * 0 = fallback to a locale of lower priority
615 * -1 = fallback to all locales failed, not even to the C locale
98994639
HS
616 */
617
0e92a118
KW
618 int ok = 1;
619
98994639 620#if defined(USE_LOCALE)
98994639
HS
621#ifdef USE_LOCALE_CTYPE
622 char *curctype = NULL;
623#endif /* USE_LOCALE_CTYPE */
624#ifdef USE_LOCALE_COLLATE
625 char *curcoll = NULL;
626#endif /* USE_LOCALE_COLLATE */
627#ifdef USE_LOCALE_NUMERIC
628 char *curnum = NULL;
629#endif /* USE_LOCALE_NUMERIC */
630#ifdef __GLIBC__
7452cf6a 631 char * const language = PerlEnv_getenv("LANGUAGE");
98994639 632#endif
65ebb059 633
ccd65d51
KW
634 /* NULL uses the existing already set up locale */
635 const char * const setlocale_init = (PerlEnv_getenv("PERL_SKIP_LOCALE_INIT"))
636 ? NULL
637 : "";
c3fcd832
KW
638 const char* trial_locales[5]; /* 5 = 1 each for "", LC_ALL, LANG, "", C */
639 unsigned int trial_locales_count;
7452cf6a
AL
640 char * const lc_all = PerlEnv_getenv("LC_ALL");
641 char * const lang = PerlEnv_getenv("LANG");
98994639 642 bool setlocale_failure = FALSE;
65ebb059
KW
643 unsigned int i;
644 char *p;
645 const bool locwarn = (printwarn > 1 ||
646 (printwarn &&
96e440d2
JH
647 (!(p = PerlEnv_getenv("PERL_BADLANG")) ||
648 grok_atou(p, NULL))));
0e92a118 649 bool done = FALSE;
6bce99ee
JH
650#ifdef WIN32
651 /* In some systems you can find out the system default locale
652 * and use that as the fallback locale. */
653# define SYSTEM_DEFAULT_LOCALE
654#endif
655#ifdef SYSTEM_DEFAULT_LOCALE
65ebb059 656 const char *system_default_locale = NULL;
6bce99ee 657#endif
98994639 658
0e92a118
KW
659#ifndef LOCALE_ENVIRON_REQUIRED
660 PERL_UNUSED_VAR(done);
661#else
98994639
HS
662
663 /*
664 * Ultrix setlocale(..., "") fails if there are no environment
665 * variables from which to get a locale name.
666 */
667
b3e384bf 668# ifdef LC_ALL
98994639 669 if (lang) {
b385bb4d 670 if (my_setlocale(LC_ALL, setlocale_init))
98994639
HS
671 done = TRUE;
672 else
673 setlocale_failure = TRUE;
674 }
675 if (!setlocale_failure) {
b3e384bf 676# ifdef USE_LOCALE_CTYPE
56279a21 677 Safefree(curctype);
98994639 678 if (! (curctype =
b385bb4d 679 my_setlocale(LC_CTYPE,
98994639 680 (!done && (lang || PerlEnv_getenv("LC_CTYPE")))
ccd65d51 681 ? setlocale_init : NULL)))
98994639
HS
682 setlocale_failure = TRUE;
683 else
684 curctype = savepv(curctype);
b3e384bf
KW
685# endif /* USE_LOCALE_CTYPE */
686# ifdef USE_LOCALE_COLLATE
56279a21 687 Safefree(curcoll);
98994639 688 if (! (curcoll =
b385bb4d 689 my_setlocale(LC_COLLATE,
98994639 690 (!done && (lang || PerlEnv_getenv("LC_COLLATE")))
ccd65d51 691 ? setlocale_init : NULL)))
98994639
HS
692 setlocale_failure = TRUE;
693 else
694 curcoll = savepv(curcoll);
b3e384bf
KW
695# endif /* USE_LOCALE_COLLATE */
696# ifdef USE_LOCALE_NUMERIC
56279a21 697 Safefree(curnum);
98994639 698 if (! (curnum =
b385bb4d 699 my_setlocale(LC_NUMERIC,
98994639 700 (!done && (lang || PerlEnv_getenv("LC_NUMERIC")))
ccd65d51 701 ? setlocale_init : NULL)))
98994639
HS
702 setlocale_failure = TRUE;
703 else
704 curnum = savepv(curnum);
b3e384bf 705# endif /* USE_LOCALE_NUMERIC */
a782673d
KW
706# ifdef USE_LOCALE_MESSAGES
707 if (! my_setlocale(LC_MESSAGES,
708 (!done && (lang || PerlEnv_getenv("LC_MESSAGES")))
709 ? setlocale_init : NULL))
710 {
711 setlocale_failure = TRUE;
712 }
713# endif /* USE_LOCALE_MESSAGES */
c835d6be
KW
714# ifdef USE_LOCALE_MONETARY
715 if (! my_setlocale(LC_MONETARY,
716 (!done && (lang || PerlEnv_getenv("LC_MONETARY")))
717 ? setlocale_init : NULL))
718 {
719 setlocale_failure = TRUE;
720 }
721# endif /* USE_LOCALE_MONETARY */
98994639
HS
722 }
723
b3e384bf 724# endif /* LC_ALL */
98994639
HS
725
726#endif /* !LOCALE_ENVIRON_REQUIRED */
727
65ebb059
KW
728 /* We try each locale in the list until we get one that works, or exhaust
729 * the list */
c3fcd832
KW
730 trial_locales[0] = setlocale_init;
731 trial_locales_count = 1;
65ebb059
KW
732 for (i= 0; i < trial_locales_count; i++) {
733 const char * trial_locale = trial_locales[i];
734
735 if (i > 0) {
736
737 /* XXX This is to preserve old behavior for LOCALE_ENVIRON_REQUIRED
738 * when i==0, but I (khw) don't think that behavior makes much
739 * sense */
740 setlocale_failure = FALSE;
741
6bce99ee
JH
742#ifdef SYSTEM_DEFAULT_LOCALE
743# ifdef WIN32
65ebb059
KW
744 /* On Windows machines, an entry of "" after the 0th means to use
745 * the system default locale, which we now proceed to get. */
746 if (strEQ(trial_locale, "")) {
747 unsigned int j;
748
749 /* Note that this may change the locale, but we are going to do
750 * that anyway just below */
751 system_default_locale = setlocale(LC_ALL, "");
752
753 /* Skip if invalid or it's already on the list of locales to
754 * try */
755 if (! system_default_locale) {
756 goto next_iteration;
757 }
758 for (j = 0; j < trial_locales_count; j++) {
759 if (strEQ(system_default_locale, trial_locales[j])) {
760 goto next_iteration;
761 }
762 }
763
764 trial_locale = system_default_locale;
765 }
6bce99ee
JH
766# endif /* WIN32 */
767#endif /* SYSTEM_DEFAULT_LOCALE */
65ebb059
KW
768 }
769
98994639 770#ifdef LC_ALL
7cd8b568 771 if (! my_setlocale(LC_ALL, trial_locale)) {
49c85077 772 setlocale_failure = TRUE;
7cd8b568
KW
773 }
774 else {
775 /* Since LC_ALL succeeded, it should have changed all the other
776 * categories it can to its value; so we massage things so that the
777 * setlocales below just return their category's current values.
778 * This adequately handles the case in NetBSD where LC_COLLATE may
779 * not be defined for a locale, and setting it individually will
780 * fail, whereas setting LC_ALL suceeds, leaving LC_COLLATE set to
781 * the POSIX locale. */
782 trial_locale = NULL;
783 }
98994639
HS
784#endif /* LC_ALL */
785
49c85077 786 if (!setlocale_failure) {
98994639 787#ifdef USE_LOCALE_CTYPE
49c85077
KW
788 Safefree(curctype);
789 if (! (curctype = my_setlocale(LC_CTYPE, trial_locale)))
790 setlocale_failure = TRUE;
791 else
792 curctype = savepv(curctype);
98994639
HS
793#endif /* USE_LOCALE_CTYPE */
794#ifdef USE_LOCALE_COLLATE
49c85077
KW
795 Safefree(curcoll);
796 if (! (curcoll = my_setlocale(LC_COLLATE, trial_locale)))
797 setlocale_failure = TRUE;
798 else
799 curcoll = savepv(curcoll);
98994639
HS
800#endif /* USE_LOCALE_COLLATE */
801#ifdef USE_LOCALE_NUMERIC
49c85077
KW
802 Safefree(curnum);
803 if (! (curnum = my_setlocale(LC_NUMERIC, trial_locale)))
804 setlocale_failure = TRUE;
805 else
806 curnum = savepv(curnum);
98994639 807#endif /* USE_LOCALE_NUMERIC */
a782673d
KW
808#ifdef USE_LOCALE_MESSAGES
809 if (! (my_setlocale(LC_MESSAGES, trial_locale)))
810 setlocale_failure = TRUE;
811#endif /* USE_LOCALE_MESSAGES */
c835d6be
KW
812#ifdef USE_LOCALE_MONETARY
813 if (! (my_setlocale(LC_MONETARY, trial_locale)))
814 setlocale_failure = TRUE;
815#endif /* USE_LOCALE_MONETARY */
816
49c85077
KW
817 if (! setlocale_failure) { /* Success */
818 break;
819 }
65ebb059 820 }
98994639 821
49c85077
KW
822 /* Here, something failed; will need to try a fallback. */
823 ok = 0;
65ebb059 824
49c85077
KW
825 if (i == 0) {
826 unsigned int j;
98994639 827
65ebb059 828 if (locwarn) { /* Output failure info only on the first one */
98994639
HS
829#ifdef LC_ALL
830
49c85077
KW
831 PerlIO_printf(Perl_error_log,
832 "perl: warning: Setting locale failed.\n");
98994639
HS
833
834#else /* !LC_ALL */
835
49c85077
KW
836 PerlIO_printf(Perl_error_log,
837 "perl: warning: Setting locale failed for the categories:\n\t");
98994639 838#ifdef USE_LOCALE_CTYPE
49c85077
KW
839 if (! curctype)
840 PerlIO_printf(Perl_error_log, "LC_CTYPE ");
98994639
HS
841#endif /* USE_LOCALE_CTYPE */
842#ifdef USE_LOCALE_COLLATE
49c85077
KW
843 if (! curcoll)
844 PerlIO_printf(Perl_error_log, "LC_COLLATE ");
98994639
HS
845#endif /* USE_LOCALE_COLLATE */
846#ifdef USE_LOCALE_NUMERIC
49c85077
KW
847 if (! curnum)
848 PerlIO_printf(Perl_error_log, "LC_NUMERIC ");
98994639 849#endif /* USE_LOCALE_NUMERIC */
a782673d 850 PerlIO_printf(Perl_error_log, "and possibly others\n");
98994639
HS
851
852#endif /* LC_ALL */
853
49c85077
KW
854 PerlIO_printf(Perl_error_log,
855 "perl: warning: Please check that your locale settings:\n");
98994639
HS
856
857#ifdef __GLIBC__
49c85077
KW
858 PerlIO_printf(Perl_error_log,
859 "\tLANGUAGE = %c%s%c,\n",
860 language ? '"' : '(',
861 language ? language : "unset",
862 language ? '"' : ')');
98994639
HS
863#endif
864
49c85077
KW
865 PerlIO_printf(Perl_error_log,
866 "\tLC_ALL = %c%s%c,\n",
867 lc_all ? '"' : '(',
868 lc_all ? lc_all : "unset",
869 lc_all ? '"' : ')');
98994639
HS
870
871#if defined(USE_ENVIRON_ARRAY)
49c85077
KW
872 {
873 char **e;
874 for (e = environ; *e; e++) {
875 if (strnEQ(*e, "LC_", 3)
876 && strnNE(*e, "LC_ALL=", 7)
877 && (p = strchr(*e, '=')))
878 PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n",
879 (int)(p - *e), *e, p + 1);
880 }
881 }
98994639 882#else
49c85077
KW
883 PerlIO_printf(Perl_error_log,
884 "\t(possibly more locale environment variables)\n");
98994639
HS
885#endif
886
49c85077
KW
887 PerlIO_printf(Perl_error_log,
888 "\tLANG = %c%s%c\n",
889 lang ? '"' : '(',
890 lang ? lang : "unset",
891 lang ? '"' : ')');
98994639 892
49c85077
KW
893 PerlIO_printf(Perl_error_log,
894 " are supported and installed on your system.\n");
895 }
98994639 896
65ebb059
KW
897 /* Calculate what fallback locales to try. We have avoided this
898 * until we have to, becuase failure is quite unlikely. This will
899 * usually change the upper bound of the loop we are in.
900 *
901 * Since the system's default way of setting the locale has not
902 * found one that works, We use Perl's defined ordering: LC_ALL,
903 * LANG, and the C locale. We don't try the same locale twice, so
904 * don't add to the list if already there. (On POSIX systems, the
905 * LC_ALL element will likely be a repeat of the 0th element "",
906 * but there's no harm done by doing it explicitly */
907 if (lc_all) {
908 for (j = 0; j < trial_locales_count; j++) {
909 if (strEQ(lc_all, trial_locales[j])) {
910 goto done_lc_all;
911 }
912 }
913 trial_locales[trial_locales_count++] = lc_all;
914 }
915 done_lc_all:
98994639 916
65ebb059
KW
917 if (lang) {
918 for (j = 0; j < trial_locales_count; j++) {
919 if (strEQ(lang, trial_locales[j])) {
920 goto done_lang;
921 }
922 }
923 trial_locales[trial_locales_count++] = lang;
924 }
925 done_lang:
926
927#if defined(WIN32) && defined(LC_ALL)
928 /* For Windows, we also try the system default locale before "C".
929 * (If there exists a Windows without LC_ALL we skip this because
930 * it gets too complicated. For those, the "C" is the next
931 * fallback possibility). The "" is the same as the 0th element of
932 * the array, but the code at the loop above knows to treat it
933 * differently when not the 0th */
934 trial_locales[trial_locales_count++] = "";
935#endif
936
937 for (j = 0; j < trial_locales_count; j++) {
938 if (strEQ("C", trial_locales[j])) {
939 goto done_C;
940 }
941 }
942 trial_locales[trial_locales_count++] = "C";
98994639 943
65ebb059
KW
944 done_C: ;
945 } /* end of first time through the loop */
98994639 946
65ebb059
KW
947#ifdef WIN32
948 next_iteration: ;
949#endif
950
951 } /* end of looping through the trial locales */
952
953 if (ok < 1) { /* If we tried to fallback */
954 const char* msg;
955 if (! setlocale_failure) { /* fallback succeeded */
956 msg = "Falling back to";
957 }
958 else { /* fallback failed */
98994639 959
65ebb059
KW
960 /* We dropped off the end of the loop, so have to decrement i to
961 * get back to the value the last time through */
962 i--;
98994639 963
65ebb059
KW
964 ok = -1;
965 msg = "Failed to fall back to";
966
967 /* To continue, we should use whatever values we've got */
98994639 968#ifdef USE_LOCALE_CTYPE
49c85077
KW
969 Safefree(curctype);
970 curctype = savepv(setlocale(LC_CTYPE, NULL));
98994639
HS
971#endif /* USE_LOCALE_CTYPE */
972#ifdef USE_LOCALE_COLLATE
49c85077
KW
973 Safefree(curcoll);
974 curcoll = savepv(setlocale(LC_COLLATE, NULL));
98994639
HS
975#endif /* USE_LOCALE_COLLATE */
976#ifdef USE_LOCALE_NUMERIC
49c85077
KW
977 Safefree(curnum);
978 curnum = savepv(setlocale(LC_NUMERIC, NULL));
98994639 979#endif /* USE_LOCALE_NUMERIC */
65ebb059
KW
980 }
981
982 if (locwarn) {
983 const char * description;
984 const char * name = "";
985 if (strEQ(trial_locales[i], "C")) {
986 description = "the standard locale";
987 name = "C";
988 }
6bce99ee 989#ifdef SYSTEM_DEFAULT_LOCALE
65ebb059
KW
990 else if (strEQ(trial_locales[i], "")) {
991 description = "the system default locale";
992 if (system_default_locale) {
993 name = system_default_locale;
994 }
995 }
6bce99ee 996#endif /* SYSTEM_DEFAULT_LOCALE */
65ebb059
KW
997 else {
998 description = "a fallback locale";
999 name = trial_locales[i];
1000 }
1001 if (name && strNE(name, "")) {
1002 PerlIO_printf(Perl_error_log,
1003 "perl: warning: %s %s (\"%s\").\n", msg, description, name);
1004 }
1005 else {
1006 PerlIO_printf(Perl_error_log,
1007 "perl: warning: %s %s.\n", msg, description);
1008 }
1009 }
1010 } /* End of tried to fallback */
98994639
HS
1011
1012#ifdef USE_LOCALE_CTYPE
1013 new_ctype(curctype);
1014#endif /* USE_LOCALE_CTYPE */
1015
1016#ifdef USE_LOCALE_COLLATE
1017 new_collate(curcoll);
1018#endif /* USE_LOCALE_COLLATE */
1019
1020#ifdef USE_LOCALE_NUMERIC
1021 new_numeric(curnum);
1022#endif /* USE_LOCALE_NUMERIC */
b310b053 1023
8ef6e574 1024#if defined(USE_PERLIO) && defined(USE_LOCALE_CTYPE)
49c85077
KW
1025 /* Set PL_utf8locale to TRUE if using PerlIO _and_ the current LC_CTYPE
1026 * locale is UTF-8. If PL_utf8locale and PL_unicode (set by -C or by
1027 * $ENV{PERL_UNICODE}) are true, perl.c:S_parse_body() will turn on the
1028 * PerlIO :utf8 layer on STDIN, STDOUT, STDERR, _and_ the default open
1029 * discipline. */
c1284011 1030 PL_utf8locale = _is_cur_LC_category_utf8(LC_CTYPE);
49c85077 1031
a05d7ebb 1032 /* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO.
fde18df1
JH
1033 This is an alternative to using the -C command line switch
1034 (the -C if present will override this). */
1035 {
dd374669 1036 const char *p = PerlEnv_getenv("PERL_UNICODE");
a05d7ebb 1037 PL_unicode = p ? parse_unicode_opts(&p) : 0;
5a22a2bb
NC
1038 if (PL_unicode & PERL_UNICODE_UTF8CACHEASSERT_FLAG)
1039 PL_utf8cache = -1;
b310b053 1040 }
ec71e770 1041#endif
b310b053 1042
98994639 1043#ifdef USE_LOCALE_CTYPE
43c5f42d 1044 Safefree(curctype);
98994639
HS
1045#endif /* USE_LOCALE_CTYPE */
1046#ifdef USE_LOCALE_COLLATE
43c5f42d 1047 Safefree(curcoll);
98994639
HS
1048#endif /* USE_LOCALE_COLLATE */
1049#ifdef USE_LOCALE_NUMERIC
43c5f42d 1050 Safefree(curnum);
98994639 1051#endif /* USE_LOCALE_NUMERIC */
8ef6e574 1052
f2ce9e1c
JH
1053#else /* !USE_LOCALE */
1054 PERL_UNUSED_ARG(printwarn);
8ef6e574
KW
1055#endif /* USE_LOCALE */
1056
98994639
HS
1057 return ok;
1058}
1059
49c85077 1060
98994639
HS
1061#ifdef USE_LOCALE_COLLATE
1062
1063/*
1064 * mem_collxfrm() is a bit like strxfrm() but with two important
1065 * differences. First, it handles embedded NULs. Second, it allocates
1066 * a bit more memory than needed for the transformed data itself.
1067 * The real transformed data begins at offset sizeof(collationix).
1068 * Please see sv_collxfrm() to see how this is used.
1069 */
166f8a29 1070
98994639
HS
1071char *
1072Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen)
1073{
1074 char *xbuf;
1075 STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */
1076
7918f24d
NC
1077 PERL_ARGS_ASSERT_MEM_COLLXFRM;
1078
98994639
HS
1079 /* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
1080 /* the +1 is for the terminating NUL. */
1081
1082 xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1;
a02a5408 1083 Newx(xbuf, xAlloc, char);
98994639
HS
1084 if (! xbuf)
1085 goto bad;
1086
1087 *(U32*)xbuf = PL_collation_ix;
1088 xout = sizeof(PL_collation_ix);
1089 for (xin = 0; xin < len; ) {
224e8ef5 1090 Size_t xused;
98994639
HS
1091
1092 for (;;) {
1093 xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout);
224e8ef5 1094 if (xused >= PERL_INT_MAX)
98994639 1095 goto bad;
eb160463 1096 if ((STRLEN)xused < xAlloc - xout)
98994639
HS
1097 break;
1098 xAlloc = (2 * xAlloc) + 1;
1099 Renew(xbuf, xAlloc, char);
1100 if (! xbuf)
1101 goto bad;
1102 }
1103
1104 xin += strlen(s + xin) + 1;
1105 xout += xused;
1106
1107 /* Embedded NULs are understood but silently skipped
1108 * because they make no sense in locale collation. */
1109 }
1110
1111 xbuf[xout] = '\0';
1112 *xlen = xout - sizeof(PL_collation_ix);
1113 return xbuf;
1114
1115 bad:
1116 Safefree(xbuf);
1117 *xlen = 0;
1118 return NULL;
1119}
1120
1121#endif /* USE_LOCALE_COLLATE */
1122
8ef6e574
KW
1123#ifdef USE_LOCALE
1124
c1284011
KW
1125bool
1126Perl__is_cur_LC_category_utf8(pTHX_ int category)
7d74bb61
KW
1127{
1128 /* Returns TRUE if the current locale for 'category' is UTF-8; FALSE
1129 * otherwise. 'category' may not be LC_ALL. If the platform doesn't have
119ee68b 1130 * nl_langinfo(), nor MB_CUR_MAX, this employs a heuristic, which hence
609548d2
KW
1131 * could give the wrong result. The result will very likely be correct for
1132 * languages that have commonly used non-ASCII characters, but for notably
1133 * English, it comes down to if the locale's name ends in something like
1134 * "UTF-8". It errs on the side of not being a UTF-8 locale. */
7d74bb61
KW
1135
1136 char *save_input_locale = NULL;
7d74bb61
KW
1137 STRLEN final_pos;
1138
8ef6e574 1139#ifdef LC_ALL
7d74bb61 1140 assert(category != LC_ALL);
8ef6e574 1141#endif
7d74bb61
KW
1142
1143 /* First dispose of the trivial cases */
b07fffd1 1144 save_input_locale = setlocale(category, NULL);
7d74bb61 1145 if (! save_input_locale) {
69014004
KW
1146 DEBUG_L(PerlIO_printf(Perl_debug_log,
1147 "Could not find current locale for category %d\n",
1148 category));
7d74bb61
KW
1149 return FALSE; /* XXX maybe should croak */
1150 }
b07fffd1 1151 save_input_locale = stdize_locale(savepv(save_input_locale));
a39edc4c 1152 if (isNAME_C_OR_POSIX(save_input_locale)) {
69014004
KW
1153 DEBUG_L(PerlIO_printf(Perl_debug_log,
1154 "Current locale for category %d is %s\n",
1155 category, save_input_locale));
b07fffd1 1156 Safefree(save_input_locale);
7d74bb61
KW
1157 return FALSE;
1158 }
1159
1d958db2
KW
1160#if defined(USE_LOCALE_CTYPE) \
1161 && (defined(MB_CUR_MAX) || (defined(HAS_NL_LANGINFO) && defined(CODESET)))
7d74bb61 1162
1d958db2 1163 { /* Next try nl_langinfo or MB_CUR_MAX if available */
7d74bb61
KW
1164
1165 char *save_ctype_locale = NULL;
119ee68b 1166 bool is_utf8;
7d74bb61 1167
119ee68b 1168 if (category != LC_CTYPE) { /* These work only on LC_CTYPE */
7d74bb61
KW
1169
1170 /* Get the current LC_CTYPE locale */
4f72bb37 1171 save_ctype_locale = setlocale(LC_CTYPE, NULL);
7d74bb61 1172 if (! save_ctype_locale) {
69014004
KW
1173 DEBUG_L(PerlIO_printf(Perl_debug_log,
1174 "Could not find current locale for LC_CTYPE\n"));
7d74bb61
KW
1175 goto cant_use_nllanginfo;
1176 }
4f72bb37 1177 save_ctype_locale = stdize_locale(savepv(save_ctype_locale));
7d74bb61
KW
1178
1179 /* If LC_CTYPE and the desired category use the same locale, this
1180 * means that finding the value for LC_CTYPE is the same as finding
1181 * the value for the desired category. Otherwise, switch LC_CTYPE
1182 * to the desired category's locale */
1183 if (strEQ(save_ctype_locale, save_input_locale)) {
1184 Safefree(save_ctype_locale);
1185 save_ctype_locale = NULL;
1186 }
1187 else if (! setlocale(LC_CTYPE, save_input_locale)) {
69014004
KW
1188 DEBUG_L(PerlIO_printf(Perl_debug_log,
1189 "Could not change LC_CTYPE locale to %s\n",
1190 save_input_locale));
7d74bb61
KW
1191 Safefree(save_ctype_locale);
1192 goto cant_use_nllanginfo;
1193 }
1194 }
1195
69014004
KW
1196 DEBUG_L(PerlIO_printf(Perl_debug_log, "Current LC_CTYPE locale=%s\n",
1197 save_input_locale));
1198
7d74bb61 1199 /* Here the current LC_CTYPE is set to the locale of the category whose
1d958db2
KW
1200 * information is desired. This means that nl_langinfo() and MB_CUR_MAX
1201 * should give the correct results */
119ee68b 1202
1d958db2
KW
1203# if defined(HAS_NL_LANGINFO) && defined(CODESET)
1204 {
4f72bb37 1205 char *codeset = nl_langinfo(CODESET);
1d958db2 1206 if (codeset && strNE(codeset, "")) {
4f72bb37 1207 codeset = savepv(codeset);
119ee68b 1208
1d958db2
KW
1209 /* If we switched LC_CTYPE, switch back */
1210 if (save_ctype_locale) {
1211 setlocale(LC_CTYPE, save_ctype_locale);
1212 Safefree(save_ctype_locale);
1213 }
1214
1215 is_utf8 = foldEQ(codeset, STR_WITH_LEN("UTF-8"))
1216 || foldEQ(codeset, STR_WITH_LEN("UTF8"));
1217
69014004
KW
1218 DEBUG_L(PerlIO_printf(Perl_debug_log,
1219 "\tnllanginfo returned CODESET '%s'; ?UTF8 locale=%d\n",
1220 codeset, is_utf8));
1d958db2
KW
1221 Safefree(codeset);
1222 Safefree(save_input_locale);
1223 return is_utf8;
1224 }
119ee68b
KW
1225 }
1226
1d958db2
KW
1227# endif
1228# ifdef MB_CUR_MAX
1229
1230 /* Here, either we don't have nl_langinfo, or it didn't return a
1231 * codeset. Try MB_CUR_MAX */
1232
119ee68b
KW
1233 /* Standard UTF-8 needs at least 4 bytes to represent the maximum
1234 * Unicode code point. Since UTF-8 is the only non-single byte
1235 * encoding we handle, we just say any such encoding is UTF-8, and if
1236 * turns out to be wrong, other things will fail */
1237 is_utf8 = MB_CUR_MAX >= 4;
1238
69014004
KW
1239 DEBUG_L(PerlIO_printf(Perl_debug_log,
1240 "\tMB_CUR_MAX=%d; ?UTF8 locale=%d\n",
1241 (int) MB_CUR_MAX, is_utf8));
1242
119ee68b
KW
1243 Safefree(save_input_locale);
1244
1245# ifdef HAS_MBTOWC
1246
1247 /* ... But, most system that have MB_CUR_MAX will also have mbtowc(),
1248 * since they are both in the C99 standard. We can feed a known byte
1249 * string to the latter function, and check that it gives the expected
1250 * result */
1251 if (is_utf8) {
1252 wchar_t wc;
856b881c 1253 PERL_UNUSED_RESULT(mbtowc(&wc, NULL, 0));/* Reset any shift state */
69014004 1254 errno = 0;
f019f68f 1255 if ((size_t)mbtowc(&wc, HYPHEN_UTF8, strlen(HYPHEN_UTF8))
119ee68b
KW
1256 != strlen(HYPHEN_UTF8)
1257 || wc != (wchar_t) 0x2010)
1258 {
1259 is_utf8 = FALSE;
abdcbdb8 1260 DEBUG_L(PerlIO_printf(Perl_debug_log, "\thyphen=U+%x\n", (unsigned int)wc));
69014004
KW
1261 DEBUG_L(PerlIO_printf(Perl_debug_log,
1262 "\treturn from mbtowc=%d; errno=%d; ?UTF8 locale=0\n",
1263 mbtowc(&wc, HYPHEN_UTF8, strlen(HYPHEN_UTF8)), errno));
119ee68b
KW
1264 }
1265 }
119ee68b
KW
1266# endif
1267
1d958db2
KW
1268 /* If we switched LC_CTYPE, switch back */
1269 if (save_ctype_locale) {
1270 setlocale(LC_CTYPE, save_ctype_locale);
1271 Safefree(save_ctype_locale);
119ee68b 1272 }
7d74bb61 1273
1d958db2 1274 return is_utf8;
119ee68b 1275# endif
7d74bb61 1276 }
119ee68b 1277
7d74bb61
KW
1278 cant_use_nllanginfo:
1279
0080c90a
KW
1280#else /* nl_langinfo should work if available, so don't bother compiling this
1281 fallback code. The final fallback of looking at the name is
1282 compiled, and will be executed if nl_langinfo fails */
7d74bb61 1283
97f4de96
KW
1284 /* nl_langinfo not available or failed somehow. Next try looking at the
1285 * currency symbol to see if it disambiguates things. Often that will be
1286 * in the native script, and if the symbol isn't in UTF-8, we know that the
1287 * locale isn't. If it is non-ASCII UTF-8, we infer that the locale is
609548d2
KW
1288 * too, as the odds of a non-UTF8 string being valid UTF-8 are quite small
1289 * */
fa9b773e
KW
1290
1291#ifdef HAS_LOCALECONV
fa9b773e 1292# ifdef USE_LOCALE_MONETARY
fa9b773e
KW
1293 {
1294 char *save_monetary_locale = NULL;
fa9b773e 1295 bool only_ascii = FALSE;
13542a67
KW
1296 bool is_utf8 = FALSE;
1297 struct lconv* lc;
fa9b773e 1298
97f4de96
KW
1299 /* Like above for LC_CTYPE, we first set LC_MONETARY to the locale of
1300 * the desired category, if it isn't that locale already */
1301
fa9b773e
KW
1302 if (category != LC_MONETARY) {
1303
4f72bb37 1304 save_monetary_locale = setlocale(LC_MONETARY, NULL);
fa9b773e 1305 if (! save_monetary_locale) {
69014004
KW
1306 DEBUG_L(PerlIO_printf(Perl_debug_log,
1307 "Could not find current locale for LC_MONETARY\n"));
fa9b773e
KW
1308 goto cant_use_monetary;
1309 }
4f72bb37 1310 save_monetary_locale = stdize_locale(savepv(save_monetary_locale));
fa9b773e 1311
13542a67
KW
1312 if (strEQ(save_monetary_locale, save_input_locale)) {
1313 Safefree(save_monetary_locale);
1314 save_monetary_locale = NULL;
1315 }
1316 else if (! setlocale(LC_MONETARY, save_input_locale)) {
59c234b4
KW
1317 DEBUG_L(PerlIO_printf(Perl_debug_log,
1318 "Could not change LC_MONETARY locale to %s\n",
1319 save_input_locale));
1320 Safefree(save_monetary_locale);
1321 goto cant_use_monetary;
fa9b773e
KW
1322 }
1323 }
1324
1325 /* Here the current LC_MONETARY is set to the locale of the category
1326 * whose information is desired. */
1327
13542a67
KW
1328 lc = localeconv();
1329 if (! lc
1330 || ! lc->currency_symbol
9f10db87 1331 || is_invariant_string((U8 *) lc->currency_symbol, 0))
13542a67
KW
1332 {
1333 DEBUG_L(PerlIO_printf(Perl_debug_log, "Couldn't get currency symbol for %s, or contains only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
1334 only_ascii = TRUE;
1335 }
1336 else {
1337 is_utf8 = is_utf8_string((U8 *) lc->currency_symbol, 0);
fa9b773e
KW
1338 }
1339
1340 /* If we changed it, restore LC_MONETARY to its original locale */
1341 if (save_monetary_locale) {
1342 setlocale(LC_MONETARY, save_monetary_locale);
1343 Safefree(save_monetary_locale);
1344 }
1345
13542a67 1346 if (! only_ascii) {
fa9b773e 1347
59c234b4
KW
1348 /* It isn't a UTF-8 locale if the symbol is not legal UTF-8;
1349 * otherwise assume the locale is UTF-8 if and only if the symbol
1350 * is non-ascii UTF-8. */
1351 DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?Currency symbol for %s is UTF-8=%d\n",
1352 save_input_locale, is_utf8));
1353 Safefree(save_input_locale);
1354 return is_utf8;
13542a67 1355 }
fa9b773e
KW
1356 }
1357 cant_use_monetary:
1358
1359# endif /* USE_LOCALE_MONETARY */
1360#endif /* HAS_LOCALECONV */
1361
15f7e74e
KW
1362#if defined(HAS_STRFTIME) && defined(USE_LOCALE_TIME)
1363
1364/* Still haven't found a non-ASCII string to disambiguate UTF-8 or not. Try
1365 * the names of the months and weekdays, timezone, and am/pm indicator */
1366 {
1367 char *save_time_locale = NULL;
1368 int hour = 10;
1369 bool is_dst = FALSE;
1370 int dom = 1;
1371 int month = 0;
1372 int i;
1373 char * formatted_time;
1374
1375
1376 /* Like above for LC_MONETARY, we set LC_TIME to the locale of the
1377 * desired category, if it isn't that locale already */
1378
1379 if (category != LC_TIME) {
1380
1381 save_time_locale = setlocale(LC_TIME, NULL);
1382 if (! save_time_locale) {
1383 DEBUG_L(PerlIO_printf(Perl_debug_log,
1384 "Could not find current locale for LC_TIME\n"));
1385 goto cant_use_time;
1386 }
1387 save_time_locale = stdize_locale(savepv(save_time_locale));
1388
1389 if (strEQ(save_time_locale, save_input_locale)) {
1390 Safefree(save_time_locale);
1391 save_time_locale = NULL;
1392 }
1393 else if (! setlocale(LC_TIME, save_input_locale)) {
1394 DEBUG_L(PerlIO_printf(Perl_debug_log,
1395 "Could not change LC_TIME locale to %s\n",
1396 save_input_locale));
1397 Safefree(save_time_locale);
1398 goto cant_use_time;
1399 }
1400 }
1401
1402 /* Here the current LC_TIME is set to the locale of the category
1403 * whose information is desired. Look at all the days of the week and
9f10db87 1404 * month names, and the timezone and am/pm indicator for UTF-8 variant
15f7e74e
KW
1405 * characters. The first such a one found will tell us if the locale
1406 * is UTF-8 or not */
1407
1408 for (i = 0; i < 7 + 12; i++) { /* 7 days; 12 months */
1409 formatted_time = my_strftime("%A %B %Z %p",
1410 0, 0, hour, dom, month, 112, 0, 0, is_dst);
9f10db87 1411 if (! formatted_time || is_invariant_string((U8 *) formatted_time, 0)) {
15f7e74e
KW
1412
1413 /* Here, we didn't find a non-ASCII. Try the next time through
1414 * with the complemented dst and am/pm, and try with the next
1415 * weekday. After we have gotten all weekdays, try the next
1416 * month */
1417 is_dst = ! is_dst;
1418 hour = (hour + 12) % 24;
1419 dom++;
1420 if (i > 6) {
1421 month++;
1422 }
1423 continue;
1424 }
1425
1426 /* Here, we have a non-ASCII. Return TRUE is it is valid UTF8;
1427 * false otherwise. But first, restore LC_TIME to its original
1428 * locale if we changed it */
1429 if (save_time_locale) {
1430 setlocale(LC_TIME, save_time_locale);
1431 Safefree(save_time_locale);
1432 }
1433
1434 DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?time-related strings for %s are UTF-8=%d\n",
1435 save_input_locale,
1436 is_utf8_string((U8 *) formatted_time, 0)));
1437 Safefree(save_input_locale);
1438 return is_utf8_string((U8 *) formatted_time, 0);
1439 }
1440
1441 /* Falling off the end of the loop indicates all the names were just
1442 * ASCII. Go on to the next test. If we changed it, restore LC_TIME
1443 * to its original locale */
1444 if (save_time_locale) {
1445 setlocale(LC_TIME, save_time_locale);
1446 Safefree(save_time_locale);
1447 }
1448 DEBUG_L(PerlIO_printf(Perl_debug_log, "All time-related words for %s contain only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
1449 }
1450 cant_use_time:
1451
1452#endif
1453
1454#if 0 && defined(USE_LOCALE_MESSAGES) && defined(HAS_SYS_ERRLIST)
855aeb93
JH
1455
1456/* This code is ifdefd out because it was found to not be necessary in testing
5857e934
KW
1457 * on our dromedary test machine, which has over 700 locales. There, this
1458 * added no value to looking at the currency symbol and the time strings. I
1459 * left it in so as to avoid rewriting it if real-world experience indicates
1460 * that dromedary is an outlier. Essentially, instead of returning abpve if we
855aeb93
JH
1461 * haven't found illegal utf8, we continue on and examine all the strerror()
1462 * messages on the platform for utf8ness. If all are ASCII, we still don't
1463 * know the answer; but otherwise we have a pretty good indication of the
5857e934
KW
1464 * utf8ness. The reason this doesn't help much is that the messages may not
1465 * have been translated into the locale. The currency symbol and time strings
1466 * are much more likely to have been translated. */
1467 {
855aeb93 1468 int e;
5857e934
KW
1469 bool is_utf8 = FALSE;
1470 bool non_ascii = FALSE;
855aeb93 1471 char *save_messages_locale = NULL;
5857e934 1472 const char * errmsg = NULL;
855aeb93 1473
5857e934
KW
1474 /* Like above, we set LC_MESSAGES to the locale of the desired
1475 * category, if it isn't that locale already */
855aeb93
JH
1476
1477 if (category != LC_MESSAGES) {
1478
5857e934 1479 save_messages_locale = setlocale(LC_MESSAGES, NULL);
855aeb93 1480 if (! save_messages_locale) {
5857e934
KW
1481 DEBUG_L(PerlIO_printf(Perl_debug_log,
1482 "Could not find current locale for LC_MESSAGES\n"));
855aeb93
JH
1483 goto cant_use_messages;
1484 }
5857e934 1485 save_messages_locale = stdize_locale(savepv(save_messages_locale));
855aeb93
JH
1486
1487 if (strEQ(save_messages_locale, save_input_locale)) {
5857e934
KW
1488 Safefree(save_messages_locale);
1489 save_messages_locale = NULL;
855aeb93
JH
1490 }
1491 else if (! setlocale(LC_MESSAGES, save_input_locale)) {
5857e934
KW
1492 DEBUG_L(PerlIO_printf(Perl_debug_log,
1493 "Could not change LC_MESSAGES locale to %s\n",
1494 save_input_locale));
855aeb93
JH
1495 Safefree(save_messages_locale);
1496 goto cant_use_messages;
1497 }
1498 }
1499
1500 /* Here the current LC_MESSAGES is set to the locale of the category
5857e934
KW
1501 * whose information is desired. Look through all the messages. We
1502 * can't use Strerror() here because it may expand to code that
1503 * segfaults in miniperl */
855aeb93 1504
5857e934
KW
1505 for (e = 0; e <= sys_nerr; e++) {
1506 errno = 0;
1507 errmsg = sys_errlist[e];
1508 if (errno || !errmsg) {
855aeb93
JH
1509 break;
1510 }
5857e934 1511 errmsg = savepv(errmsg);
9f10db87 1512 if (! is_invariant_string((U8 *) errmsg, 0)) {
5857e934
KW
1513 non_ascii = TRUE;
1514 is_utf8 = is_utf8_string((U8 *) errmsg, 0);
1515 break;
855aeb93
JH
1516 }
1517 }
5857e934 1518 Safefree(errmsg);
855aeb93
JH
1519
1520 /* And, if we changed it, restore LC_MESSAGES to its original locale */
1521 if (save_messages_locale) {
1522 setlocale(LC_MESSAGES, save_messages_locale);
1523 Safefree(save_messages_locale);
1524 }
1525
5857e934
KW
1526 if (non_ascii) {
1527
1528 /* Any non-UTF-8 message means not a UTF-8 locale; if all are valid,
1529 * any non-ascii means it is one; otherwise we assume it isn't */
1530 DEBUG_L(PerlIO_printf(Perl_debug_log, "\t?error messages for %s are UTF-8=%d\n",
1531 save_input_locale,
1532 is_utf8));
1533 Safefree(save_input_locale);
1534 return is_utf8;
1535 }
855aeb93 1536
5857e934 1537 DEBUG_L(PerlIO_printf(Perl_debug_log, "All error messages for %s contain only ASCII; can't use for determining if UTF-8 locale\n", save_input_locale));
855aeb93
JH
1538 }
1539 cant_use_messages:
1540
1541#endif
fa9b773e 1542
0080c90a
KW
1543#endif /* the code that is compiled when no nl_langinfo */
1544
92c0a900
KW
1545#ifndef EBCDIC /* On os390, even if the name ends with "UTF-8', it isn't a
1546 UTF-8 locale */
97f4de96
KW
1547 /* As a last resort, look at the locale name to see if it matches
1548 * qr/UTF -? * 8 /ix, or some other common locale names. This "name", the
1549 * return of setlocale(), is actually defined to be opaque, so we can't
1550 * really rely on the absence of various substrings in the name to indicate
1551 * its UTF-8ness, but if it has UTF8 in the name, it is extremely likely to
1552 * be a UTF-8 locale. Similarly for the other common names */
1553
1554 final_pos = strlen(save_input_locale) - 1;
1555 if (final_pos >= 3) {
1556 char *name = save_input_locale;
1557
1558 /* Find next 'U' or 'u' and look from there */
1559 while ((name += strcspn(name, "Uu") + 1)
1560 <= save_input_locale + final_pos - 2)
1561 {
305b8651
KW
1562 if (!isALPHA_FOLD_NE(*name, 't')
1563 || isALPHA_FOLD_NE(*(name + 1), 'f'))
97f4de96
KW
1564 {
1565 continue;
1566 }
1567 name += 2;
1568 if (*(name) == '-') {
1569 if ((name > save_input_locale + final_pos - 1)) {
1570 break;
1571 }
1572 name++;
1573 }
1574 if (*(name) == '8') {
97f4de96
KW
1575 DEBUG_L(PerlIO_printf(Perl_debug_log,
1576 "Locale %s ends with UTF-8 in name\n",
1577 save_input_locale));
00c54b9c 1578 Safefree(save_input_locale);
97f4de96
KW
1579 return TRUE;
1580 }
1581 }
1582 DEBUG_L(PerlIO_printf(Perl_debug_log,
1583 "Locale %s doesn't end with UTF-8 in name\n",
1584 save_input_locale));
1585 }
92c0a900 1586#endif
97f4de96
KW
1587
1588#ifdef WIN32
1589 /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd317756.aspx */
1590 if (final_pos >= 4
1591 && *(save_input_locale + final_pos - 0) == '1'
1592 && *(save_input_locale + final_pos - 1) == '0'
1593 && *(save_input_locale + final_pos - 2) == '0'
1594 && *(save_input_locale + final_pos - 3) == '5'
1595 && *(save_input_locale + final_pos - 4) == '6')
1596 {
1597 DEBUG_L(PerlIO_printf(Perl_debug_log,
1598 "Locale %s ends with 10056 in name, is UTF-8 locale\n",
1599 save_input_locale));
1600 Safefree(save_input_locale);
1601 return TRUE;
1602 }
1603#endif
1604
1605 /* Other common encodings are the ISO 8859 series, which aren't UTF-8. But
1606 * since we are about to return FALSE anyway, there is no point in doing
1607 * this extra work */
1608#if 0
1609 if (instr(save_input_locale, "8859")) {
1610 DEBUG_L(PerlIO_printf(Perl_debug_log,
1611 "Locale %s has 8859 in name, not UTF-8 locale\n",
1612 save_input_locale));
1613 Safefree(save_input_locale);
1614 return FALSE;
1615 }
1616#endif
1617
69014004
KW
1618 DEBUG_L(PerlIO_printf(Perl_debug_log,
1619 "Assuming locale %s is not a UTF-8 locale\n",
1620 save_input_locale));
fa9b773e 1621 Safefree(save_input_locale);
7d74bb61
KW
1622 return FALSE;
1623}
1624
8ef6e574 1625#endif
7d74bb61 1626
d6ded950
KW
1627
1628bool
1629Perl__is_in_locale_category(pTHX_ const bool compiling, const int category)
1630{
1a4f13e1 1631 dVAR;
d6ded950
KW
1632 /* Internal function which returns if we are in the scope of a pragma that
1633 * enables the locale category 'category'. 'compiling' should indicate if
1634 * this is during the compilation phase (TRUE) or not (FALSE). */
1635
1636 const COP * const cop = (compiling) ? &PL_compiling : PL_curcop;
1637
1638 SV *categories = cop_hints_fetch_pvs(cop, "locale", 0);
1639 if (! categories || categories == &PL_sv_placeholder) {
1640 return FALSE;
1641 }
1642
1643 /* The pseudo-category 'not_characters' is -1, so just add 1 to each to get
1644 * a valid unsigned */
1645 assert(category >= -1);
1646 return cBOOL(SvUV(categories) & (1U << (category + 1)));
1647}
1648
2c6ee1a7
KW
1649char *
1650Perl_my_strerror(pTHX_ const int errnum) {
1651
1652 /* Uses C locale for the error text unless within scope of 'use locale' for
1653 * LC_MESSAGES */
1654
1655#ifdef USE_LOCALE_MESSAGES
8ee4b769 1656 if (! IN_LC(LC_MESSAGES)) {
2c6ee1a7 1657 char * save_locale = setlocale(LC_MESSAGES, NULL);
a39edc4c 1658 if (! isNAME_C_OR_POSIX(save_locale)) {
2c6ee1a7
KW
1659 char *errstr;
1660
1661 /* The next setlocale likely will zap this, so create a copy */
1662 save_locale = savepv(save_locale);
1663
1664 setlocale(LC_MESSAGES, "C");
1665
1666 /* This points to the static space in Strerror, with all its
1667 * limitations */
1668 errstr = Strerror(errnum);
1669
1670 setlocale(LC_MESSAGES, save_locale);
1671 Safefree(save_locale);
1672 return errstr;
1673 }
1674 }
1675#endif
1676
1677 return Strerror(errnum);
1678}
1679
66610fdd 1680/*
747c467a
KW
1681
1682=head1 Locale-related functions and macros
1683
1684=for apidoc sync_locale
1685
1686Changing the program's locale should be avoided by XS code. Nevertheless,
1687certain non-Perl libraries called from XS, such as C<Gtk> do so. When this
1688happens, Perl needs to be told that the locale has changed. Use this function
1689to do so, before returning to Perl.
1690
1691=cut
1692*/
1693
1694void
1695Perl_sync_locale(pTHX)
1696{
1697
1698#ifdef USE_LOCALE_CTYPE
1699 new_ctype(setlocale(LC_CTYPE, NULL));
1700#endif /* USE_LOCALE_CTYPE */
1701
1702#ifdef USE_LOCALE_COLLATE
1703 new_collate(setlocale(LC_COLLATE, NULL));
1704#endif
1705
1706#ifdef USE_LOCALE_NUMERIC
1707 set_numeric_local(); /* Switch from "C" to underlying LC_NUMERIC */
1708 new_numeric(setlocale(LC_NUMERIC, NULL));
1709#endif /* USE_LOCALE_NUMERIC */
1710
1711}
1712
1713
1714
1715/*
66610fdd
RGS
1716 * Local variables:
1717 * c-indentation-style: bsd
1718 * c-basic-offset: 4
14d04a33 1719 * indent-tabs-mode: nil
66610fdd
RGS
1720 * End:
1721 *
14d04a33 1722 * ex: set ts=8 sts=4 sw=4 et:
37442d52 1723 */