3 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 * 2002, 2003, 2005, 2006, 2007, 2008 by Larry Wall and others
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.
12 * A Elbereth Gilthoniel,
13 * silivren penna míriel
14 * o menel aglar elenath!
15 * Na-chaered palan-díriel
16 * o galadhremmin ennorath,
17 * Fanuilos, le linnathon
18 * nef aear, si nef aearon!
20 * [p.238 of _The Lord of the Rings_, II/i: "Many Meetings"]
23 /* utility functions for handling locale-specific stuff like what
24 * character represents the decimal point.
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.
36 #define PERL_IN_LOCALE_C
40 # include <langinfo.h>
48 * Standardize the locale name from a string returned by 'setlocale', possibly
49 * modifying that string.
51 * The typical return value of setlocale() is either
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,
55 * in some unspecified order). This is not handled by this function.
57 * In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n",
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 '='
63 S_stdize_locale(pTHX_ char *locs)
65 const char * const s = strchr(locs, '=');
68 PERL_ARGS_ASSERT_STDIZE_LOCALE;
71 const char * const t = strchr(s, '.');
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);
85 Perl_croak(aTHX_ "Can't fix broken locale name \"%s\"", locs);
93 Perl_set_numeric_radix(pTHX)
95 #ifdef USE_LOCALE_NUMERIC
97 # ifdef HAS_LOCALECONV
98 const struct lconv* const lc = localeconv();
100 if (lc && lc->decimal_point) {
101 if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) {
102 SvREFCNT_dec(PL_numeric_radix_sv);
103 PL_numeric_radix_sv = NULL;
106 if (PL_numeric_radix_sv)
107 sv_setpv(PL_numeric_radix_sv, lc->decimal_point);
109 PL_numeric_radix_sv = newSVpv(lc->decimal_point, 0);
110 if (! is_ascii_string((U8 *) lc->decimal_point, 0)
111 && is_utf8_string((U8 *) lc->decimal_point, 0)
112 && is_cur_LC_category_utf8(LC_NUMERIC))
114 SvUTF8_on(PL_numeric_radix_sv);
119 PL_numeric_radix_sv = NULL;
120 # endif /* HAS_LOCALECONV */
121 #endif /* USE_LOCALE_NUMERIC */
125 Perl_new_numeric(pTHX_ const char *newnum)
127 #ifdef USE_LOCALE_NUMERIC
129 /* Called after all libc setlocale() calls affecting LC_NUMERIC, to tell
130 * core Perl this and that 'newnum' is the name of the new locale.
131 * It installs this locale as the current underlying default.
133 * The default locale and the C locale can be toggled between by use of the
134 * set_numeric_local() and set_numeric_standard() functions, which should
135 * probably not be called directly, but only via macros like
136 * SET_NUMERIC_STANDARD() in perl.h.
138 * The toggling is necessary mainly so that a non-dot radix decimal point
139 * character can be output, while allowing internal calculations to use a
142 * This sets several interpreter-level variables:
143 * PL_numeric_name The default locale's name: a copy of 'newnum'
144 * PL_numeric_local A boolean indicating if the toggled state is such
145 * that the current locale is the default locale
146 * PL_numeric_standard A boolean indicating if the toggled state is such
147 * that the current locale is the C locale
148 * Note that both of the last two variables can be true at the same time,
149 * if the underlying locale is C. (Toggling is a no-op under these
152 * Any code changing the locale (outside this file) should use
153 * POSIX::setlocale, which calls this function. Therefore this function
154 * should be called directly only from this file and from
155 * POSIX::setlocale() */
161 Safefree(PL_numeric_name);
162 PL_numeric_name = NULL;
163 PL_numeric_standard = TRUE;
164 PL_numeric_local = TRUE;
168 save_newnum = stdize_locale(savepv(newnum));
169 if (! PL_numeric_name || strNE(PL_numeric_name, save_newnum)) {
170 Safefree(PL_numeric_name);
171 PL_numeric_name = save_newnum;
174 PL_numeric_standard = ((*save_newnum == 'C' && save_newnum[1] == '\0')
175 || strEQ(save_newnum, "POSIX"));
176 PL_numeric_local = TRUE;
179 #endif /* USE_LOCALE_NUMERIC */
183 Perl_set_numeric_standard(pTHX)
185 #ifdef USE_LOCALE_NUMERIC
188 /* Toggle the LC_NUMERIC locale to C, if not already there. Probably
189 * should use the macros like SET_NUMERIC_STANDARD() in perl.h instead of
190 * calling this directly. */
192 if (! PL_numeric_standard) {
193 setlocale(LC_NUMERIC, "C");
194 PL_numeric_standard = TRUE;
195 PL_numeric_local = FALSE;
199 #endif /* USE_LOCALE_NUMERIC */
203 Perl_set_numeric_local(pTHX)
205 #ifdef USE_LOCALE_NUMERIC
208 /* Toggle the LC_NUMERIC locale to the current underlying default, if not
209 * already there. Probably should use the macros like SET_NUMERIC_LOCAL()
210 * in perl.h instead of calling this directly. */
212 if (! PL_numeric_local) {
213 setlocale(LC_NUMERIC, PL_numeric_name);
214 PL_numeric_standard = FALSE;
215 PL_numeric_local = TRUE;
219 #endif /* USE_LOCALE_NUMERIC */
223 * Set up for a new ctype locale.
226 Perl_new_ctype(pTHX_ const char *newctype)
228 #ifdef USE_LOCALE_CTYPE
230 /* Called after all libc setlocale() calls affecting LC_CTYPE, to tell
231 * core Perl this and that 'newctype' is the name of the new locale.
233 * This function sets up the folding arrays for all 256 bytes, assuming
234 * that tofold() is tolc() since fold case is not a concept in POSIX,
236 * Any code changing the locale (outside this file) should use
237 * POSIX::setlocale, which calls this function. Therefore this function
238 * should be called directly only from this file and from
239 * POSIX::setlocale() */
244 PERL_ARGS_ASSERT_NEW_CTYPE;
246 PL_in_utf8_CTYPE_locale = is_cur_LC_category_utf8(LC_CTYPE);
248 /* A UTF-8 locale gets standard rules. But note that code still has to
249 * handle this specially because of the three problematic code points */
250 if (PL_in_utf8_CTYPE_locale) {
251 Copy(PL_fold_latin1, PL_fold_locale, 256, U8);
254 for (i = 0; i < 256; i++) {
255 if (isUPPER_LC((U8) i))
256 PL_fold_locale[i] = (U8) toLOWER_LC((U8) i);
257 else if (isLOWER_LC((U8) i))
258 PL_fold_locale[i] = (U8) toUPPER_LC((U8) i);
260 PL_fold_locale[i] = (U8) i;
264 #endif /* USE_LOCALE_CTYPE */
265 PERL_ARGS_ASSERT_NEW_CTYPE;
266 PERL_UNUSED_ARG(newctype);
271 Perl_new_collate(pTHX_ const char *newcoll)
273 #ifdef USE_LOCALE_COLLATE
275 /* Called after all libc setlocale() calls affecting LC_COLLATE, to tell
276 * core Perl this and that 'newcoll' is the name of the new locale.
278 * Any code changing the locale (outside this file) should use
279 * POSIX::setlocale, which calls this function. Therefore this function
280 * should be called directly only from this file and from
281 * POSIX::setlocale() */
286 if (PL_collation_name) {
288 Safefree(PL_collation_name);
289 PL_collation_name = NULL;
291 PL_collation_standard = TRUE;
292 PL_collxfrm_base = 0;
293 PL_collxfrm_mult = 2;
297 if (! PL_collation_name || strNE(PL_collation_name, newcoll)) {
299 Safefree(PL_collation_name);
300 PL_collation_name = stdize_locale(savepv(newcoll));
301 PL_collation_standard = ((*newcoll == 'C' && newcoll[1] == '\0')
302 || strEQ(newcoll, "POSIX"));
305 /* 2: at most so many chars ('a', 'b'). */
306 /* 50: surely no system expands a char more. */
307 #define XFRMBUFSIZE (2 * 50)
308 char xbuf[XFRMBUFSIZE];
309 const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
310 const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
311 const SSize_t mult = fb - fa;
312 if (mult < 1 && !(fa == 0 && fb == 0))
313 Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
315 PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;
316 PL_collxfrm_mult = mult;
320 #endif /* USE_LOCALE_COLLATE */
324 * Initialize locale awareness.
327 Perl_init_i18nl10n(pTHX_ int printwarn)
331 * 1 = set ok or not applicable,
332 * 0 = fallback to C locale,
333 * -1 = fallback to C locale failed
336 #if defined(USE_LOCALE)
339 #ifdef USE_LOCALE_CTYPE
340 char *curctype = NULL;
341 #endif /* USE_LOCALE_CTYPE */
342 #ifdef USE_LOCALE_COLLATE
343 char *curcoll = NULL;
344 #endif /* USE_LOCALE_COLLATE */
345 #ifdef USE_LOCALE_NUMERIC
347 #endif /* USE_LOCALE_NUMERIC */
349 char * const language = PerlEnv_getenv("LANGUAGE");
351 /* NULL uses the existing already set up locale */
352 const char * const setlocale_init = (PerlEnv_getenv("PERL_SKIP_LOCALE_INIT"))
355 char * const lc_all = PerlEnv_getenv("LC_ALL");
356 char * const lang = PerlEnv_getenv("LANG");
357 bool setlocale_failure = FALSE;
359 #ifdef LOCALE_ENVIRON_REQUIRED
362 * Ultrix setlocale(..., "") fails if there are no environment
363 * variables from which to get a locale name.
370 if (setlocale(LC_ALL, setlocale_init))
373 setlocale_failure = TRUE;
375 if (!setlocale_failure) {
376 # ifdef USE_LOCALE_CTYPE
380 (!done && (lang || PerlEnv_getenv("LC_CTYPE")))
381 ? setlocale_init : NULL)))
382 setlocale_failure = TRUE;
384 curctype = savepv(curctype);
385 # endif /* USE_LOCALE_CTYPE */
386 # ifdef USE_LOCALE_COLLATE
389 setlocale(LC_COLLATE,
390 (!done && (lang || PerlEnv_getenv("LC_COLLATE")))
391 ? setlocale_init : NULL)))
392 setlocale_failure = TRUE;
394 curcoll = savepv(curcoll);
395 # endif /* USE_LOCALE_COLLATE */
396 # ifdef USE_LOCALE_NUMERIC
399 setlocale(LC_NUMERIC,
400 (!done && (lang || PerlEnv_getenv("LC_NUMERIC")))
401 ? setlocale_init : NULL)))
402 setlocale_failure = TRUE;
404 curnum = savepv(curnum);
405 # endif /* USE_LOCALE_NUMERIC */
410 #endif /* !LOCALE_ENVIRON_REQUIRED */
413 if (! setlocale(LC_ALL, setlocale_init))
414 setlocale_failure = TRUE;
417 if (!setlocale_failure) {
418 #ifdef USE_LOCALE_CTYPE
420 if (! (curctype = setlocale(LC_CTYPE, setlocale_init)))
421 setlocale_failure = TRUE;
423 curctype = savepv(curctype);
424 #endif /* USE_LOCALE_CTYPE */
425 #ifdef USE_LOCALE_COLLATE
427 if (! (curcoll = setlocale(LC_COLLATE, setlocale_init)))
428 setlocale_failure = TRUE;
430 curcoll = savepv(curcoll);
431 #endif /* USE_LOCALE_COLLATE */
432 #ifdef USE_LOCALE_NUMERIC
434 if (! (curnum = setlocale(LC_NUMERIC, setlocale_init)))
435 setlocale_failure = TRUE;
437 curnum = savepv(curnum);
438 #endif /* USE_LOCALE_NUMERIC */
441 if (setlocale_failure) {
443 const bool locwarn = (printwarn > 1 ||
445 (!(p = PerlEnv_getenv("PERL_BADLANG")) || atoi(p))));
450 PerlIO_printf(Perl_error_log,
451 "perl: warning: Setting locale failed.\n");
455 PerlIO_printf(Perl_error_log,
456 "perl: warning: Setting locale failed for the categories:\n\t");
457 #ifdef USE_LOCALE_CTYPE
459 PerlIO_printf(Perl_error_log, "LC_CTYPE ");
460 #endif /* USE_LOCALE_CTYPE */
461 #ifdef USE_LOCALE_COLLATE
463 PerlIO_printf(Perl_error_log, "LC_COLLATE ");
464 #endif /* USE_LOCALE_COLLATE */
465 #ifdef USE_LOCALE_NUMERIC
467 PerlIO_printf(Perl_error_log, "LC_NUMERIC ");
468 #endif /* USE_LOCALE_NUMERIC */
469 PerlIO_printf(Perl_error_log, "\n");
473 PerlIO_printf(Perl_error_log,
474 "perl: warning: Please check that your locale settings:\n");
477 PerlIO_printf(Perl_error_log,
478 "\tLANGUAGE = %c%s%c,\n",
479 language ? '"' : '(',
480 language ? language : "unset",
481 language ? '"' : ')');
484 PerlIO_printf(Perl_error_log,
485 "\tLC_ALL = %c%s%c,\n",
487 lc_all ? lc_all : "unset",
490 #if defined(USE_ENVIRON_ARRAY)
493 for (e = environ; *e; e++) {
494 if (strnEQ(*e, "LC_", 3)
495 && strnNE(*e, "LC_ALL=", 7)
496 && (p = strchr(*e, '=')))
497 PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n",
498 (int)(p - *e), *e, p + 1);
502 PerlIO_printf(Perl_error_log,
503 "\t(possibly more locale environment variables)\n");
506 PerlIO_printf(Perl_error_log,
509 lang ? lang : "unset",
512 PerlIO_printf(Perl_error_log,
513 " are supported and installed on your system.\n");
518 if (setlocale(LC_ALL, "C")) {
520 PerlIO_printf(Perl_error_log,
521 "perl: warning: Falling back to the standard locale (\"C\").\n");
526 PerlIO_printf(Perl_error_log,
527 "perl: warning: Failed to fall back to the standard locale (\"C\").\n");
534 #ifdef USE_LOCALE_CTYPE
535 || !(curctype || setlocale(LC_CTYPE, "C"))
536 #endif /* USE_LOCALE_CTYPE */
537 #ifdef USE_LOCALE_COLLATE
538 || !(curcoll || setlocale(LC_COLLATE, "C"))
539 #endif /* USE_LOCALE_COLLATE */
540 #ifdef USE_LOCALE_NUMERIC
541 || !(curnum || setlocale(LC_NUMERIC, "C"))
542 #endif /* USE_LOCALE_NUMERIC */
546 PerlIO_printf(Perl_error_log,
547 "perl: warning: Cannot fall back to the standard locale (\"C\").\n");
551 #endif /* ! LC_ALL */
553 #ifdef USE_LOCALE_CTYPE
555 curctype = savepv(setlocale(LC_CTYPE, NULL));
556 #endif /* USE_LOCALE_CTYPE */
557 #ifdef USE_LOCALE_COLLATE
559 curcoll = savepv(setlocale(LC_COLLATE, NULL));
560 #endif /* USE_LOCALE_COLLATE */
561 #ifdef USE_LOCALE_NUMERIC
563 curnum = savepv(setlocale(LC_NUMERIC, NULL));
564 #endif /* USE_LOCALE_NUMERIC */
568 #ifdef USE_LOCALE_CTYPE
570 #endif /* USE_LOCALE_CTYPE */
572 #ifdef USE_LOCALE_COLLATE
573 new_collate(curcoll);
574 #endif /* USE_LOCALE_COLLATE */
576 #ifdef USE_LOCALE_NUMERIC
578 #endif /* USE_LOCALE_NUMERIC */
582 #if defined(USE_PERLIO) && defined(USE_LOCALE_CTYPE)
584 /* Set PL_utf8locale to TRUE if using PerlIO _and_
585 the current LC_CTYPE locale is UTF-8.
586 If PL_utf8locale and PL_unicode (set by -C or by $ENV{PERL_UNICODE})
587 are true, perl.c:S_parse_body() will turn on the PerlIO :utf8 layer
588 on STDIN, STDOUT, STDERR, _and_ the default open discipline.
590 PL_utf8locale = is_cur_LC_category_utf8(LC_CTYPE);
592 /* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO.
593 This is an alternative to using the -C command line switch
594 (the -C if present will override this). */
596 const char *p = PerlEnv_getenv("PERL_UNICODE");
597 PL_unicode = p ? parse_unicode_opts(&p) : 0;
598 if (PL_unicode & PERL_UNICODE_UTF8CACHEASSERT_FLAG)
603 #ifdef USE_LOCALE_CTYPE
605 #endif /* USE_LOCALE_CTYPE */
606 #ifdef USE_LOCALE_COLLATE
608 #endif /* USE_LOCALE_COLLATE */
609 #ifdef USE_LOCALE_NUMERIC
611 #endif /* USE_LOCALE_NUMERIC */
613 #endif /* USE_LOCALE */
618 #ifdef USE_LOCALE_COLLATE
621 * mem_collxfrm() is a bit like strxfrm() but with two important
622 * differences. First, it handles embedded NULs. Second, it allocates
623 * a bit more memory than needed for the transformed data itself.
624 * The real transformed data begins at offset sizeof(collationix).
625 * Please see sv_collxfrm() to see how this is used.
629 Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen)
633 STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */
635 PERL_ARGS_ASSERT_MEM_COLLXFRM;
637 /* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
638 /* the +1 is for the terminating NUL. */
640 xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1;
641 Newx(xbuf, xAlloc, char);
645 *(U32*)xbuf = PL_collation_ix;
646 xout = sizeof(PL_collation_ix);
647 for (xin = 0; xin < len; ) {
651 xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout);
652 if (xused >= PERL_INT_MAX)
654 if ((STRLEN)xused < xAlloc - xout)
656 xAlloc = (2 * xAlloc) + 1;
657 Renew(xbuf, xAlloc, char);
662 xin += strlen(s + xin) + 1;
665 /* Embedded NULs are understood but silently skipped
666 * because they make no sense in locale collation. */
670 *xlen = xout - sizeof(PL_collation_ix);
679 #endif /* USE_LOCALE_COLLATE */
684 S_is_cur_LC_category_utf8(pTHX_ int category)
686 /* Returns TRUE if the current locale for 'category' is UTF-8; FALSE
687 * otherwise. 'category' may not be LC_ALL. If the platform doesn't have
688 * nl_langinfo(), nor MB_CUR_MAX, this employs a heuristic, which hence
689 * could give the wrong result. It errs on the side of not being a UTF-8
692 char *save_input_locale = NULL;
696 assert(category != LC_ALL);
699 /* First dispose of the trivial cases */
700 save_input_locale = setlocale(category, NULL);
701 if (! save_input_locale) {
702 return FALSE; /* XXX maybe should croak */
704 save_input_locale = stdize_locale(savepv(save_input_locale));
705 if ((*save_input_locale == 'C' && save_input_locale[1] == '\0')
706 || strEQ(save_input_locale, "POSIX"))
708 Safefree(save_input_locale);
712 #if defined(USE_LOCALE_CTYPE) \
713 && (defined(MB_CUR_MAX) || (defined(HAS_NL_LANGINFO) && defined(CODESET)))
715 { /* Next try nl_langinfo or MB_CUR_MAX if available */
717 char *save_ctype_locale = NULL;
720 if (category != LC_CTYPE) { /* These work only on LC_CTYPE */
722 /* Get the current LC_CTYPE locale */
723 save_ctype_locale = stdize_locale(savepv(setlocale(LC_CTYPE, NULL)));
724 if (! save_ctype_locale) {
725 goto cant_use_nllanginfo;
728 /* If LC_CTYPE and the desired category use the same locale, this
729 * means that finding the value for LC_CTYPE is the same as finding
730 * the value for the desired category. Otherwise, switch LC_CTYPE
731 * to the desired category's locale */
732 if (strEQ(save_ctype_locale, save_input_locale)) {
733 Safefree(save_ctype_locale);
734 save_ctype_locale = NULL;
736 else if (! setlocale(LC_CTYPE, save_input_locale)) {
737 Safefree(save_ctype_locale);
738 goto cant_use_nllanginfo;
742 /* Here the current LC_CTYPE is set to the locale of the category whose
743 * information is desired. This means that nl_langinfo() and MB_CUR_MAX
744 * should give the correct results */
746 # if defined(HAS_NL_LANGINFO) && defined(CODESET)
748 char *codeset = savepv(nl_langinfo(CODESET));
749 if (codeset && strNE(codeset, "")) {
751 /* If we switched LC_CTYPE, switch back */
752 if (save_ctype_locale) {
753 setlocale(LC_CTYPE, save_ctype_locale);
754 Safefree(save_ctype_locale);
757 is_utf8 = foldEQ(codeset, STR_WITH_LEN("UTF-8"))
758 || foldEQ(codeset, STR_WITH_LEN("UTF8"));
761 Safefree(save_input_locale);
769 /* Here, either we don't have nl_langinfo, or it didn't return a
770 * codeset. Try MB_CUR_MAX */
772 /* Standard UTF-8 needs at least 4 bytes to represent the maximum
773 * Unicode code point. Since UTF-8 is the only non-single byte
774 * encoding we handle, we just say any such encoding is UTF-8, and if
775 * turns out to be wrong, other things will fail */
776 is_utf8 = MB_CUR_MAX >= 4;
778 Safefree(save_input_locale);
782 /* ... But, most system that have MB_CUR_MAX will also have mbtowc(),
783 * since they are both in the C99 standard. We can feed a known byte
784 * string to the latter function, and check that it gives the expected
788 (void) mbtowc(&wc, NULL, 0); /* Reset any shift state */
789 if (mbtowc(&wc, HYPHEN_UTF8, strlen(HYPHEN_UTF8))
790 != strlen(HYPHEN_UTF8)
791 || wc != (wchar_t) 0x2010)
798 /* If we switched LC_CTYPE, switch back */
799 if (save_ctype_locale) {
800 setlocale(LC_CTYPE, save_ctype_locale);
801 Safefree(save_ctype_locale);
810 #endif /* HAS_NL_LANGINFO etc */
812 /* nl_langinfo not available or failed somehow. Look at the locale name to
813 * see if it matches qr/UTF -? 8 /ix */
815 final_pos = strlen(save_input_locale) - 1;
816 if (final_pos >= 3) {
817 char *name = save_input_locale;
819 /* Find next 'U' or 'u' and look from there */
820 while ((name += strcspn(name, "Uu") + 1)
821 <= save_input_locale + final_pos - 2)
823 if (toFOLD(*(name)) != 't'
824 || toFOLD(*(name + 1)) != 'f')
829 if (*(name) == '-') {
830 if ((name > save_input_locale + final_pos - 1)) {
835 if (*(name) == '8') {
836 Safefree(save_input_locale);
843 /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd317756.aspx */
845 && *(save_input_locale + final_pos - 0) == '1'
846 && *(save_input_locale + final_pos - 1) == '0'
847 && *(save_input_locale + final_pos - 2) == '0'
848 && *(save_input_locale + final_pos - 3) == '5'
849 && *(save_input_locale + final_pos - 4) == '6')
851 Safefree(save_input_locale);
856 /* Other common encodings are the ISO 8859 series, which aren't UTF-8 */
857 if (instr(save_input_locale, "8859")) {
858 Safefree(save_input_locale);
862 #ifdef HAS_LOCALECONV
864 # ifdef USE_LOCALE_MONETARY
866 /* Here, there is nothing in the locale name to indicate whether the locale
867 * is UTF-8 or not. This "name", the return of setlocale(), is actually
868 * defined to be opaque, so we can't really rely on the absence of various
869 * substrings in the name to indicate its UTF-8ness. Look at the locale's
870 * currency symbol. Often that will be in the native script, and if the
871 * symbol isn't in UTF-8, we know that the locale isn't. If it is
872 * non-ASCII UTF-8, we infer that the locale is too.
873 * To do this, like above for LC_CTYPE, we first set LC_MONETARY to the
874 * locale of the desired category, if it isn't that locale already */
877 char *save_monetary_locale = NULL;
878 bool illegal_utf8 = FALSE;
879 bool only_ascii = FALSE;
880 const struct lconv* const lc = localeconv();
882 if (category != LC_MONETARY) {
884 save_monetary_locale = stdize_locale(savepv(setlocale(LC_MONETARY,
886 if (! save_monetary_locale) {
887 goto cant_use_monetary;
890 if (strNE(save_monetary_locale, save_input_locale)) {
891 if (! setlocale(LC_MONETARY, save_input_locale)) {
892 Safefree(save_monetary_locale);
893 goto cant_use_monetary;
898 /* Here the current LC_MONETARY is set to the locale of the category
899 * whose information is desired. */
901 if (lc && lc->currency_symbol) {
902 if (! is_utf8_string((U8 *) lc->currency_symbol, 0)) {
905 else if (is_ascii_string((U8 *) lc->currency_symbol, 0)) {
910 /* If we changed it, restore LC_MONETARY to its original locale */
911 if (save_monetary_locale) {
912 setlocale(LC_MONETARY, save_monetary_locale);
913 Safefree(save_monetary_locale);
916 Safefree(save_input_locale);
918 /* It isn't a UTF-8 locale if the symbol is not legal UTF-8; otherwise
919 * assume the locale is UTF-8 if and only if the symbol is non-ascii
920 * UTF-8. (We can't really tell if the locale is UTF-8 or not if the
921 * symbol is just a '$', so we err on the side of it not being UTF-8)
923 return (illegal_utf8)
930 # endif /* USE_LOCALE_MONETARY */
931 #endif /* HAS_LOCALECONV */
933 #if 0 && defined(HAS_STRERROR) && defined(USE_LOCALE_MESSAGES)
935 /* This code is ifdefd out because it was found to not be necessary in testing
936 * on our dromedary test machine, which has over 700 locales. There, looking
937 * at just the currency symbol gave essentially the same results as doing this
938 * extra work. Executing this also caused segfaults in miniperl. I left it in
939 * so as to avoid rewriting it if real-world experience indicates that
940 * dromedary is an outlier. Essentially, instead of returning abpve if we
941 * haven't found illegal utf8, we continue on and examine all the strerror()
942 * messages on the platform for utf8ness. If all are ASCII, we still don't
943 * know the answer; but otherwise we have a pretty good indication of the
944 * utf8ness. The reason this doesn't necessarily help much is that the
945 * messages may not have been translated into the locale. The currency symbol
946 * is much more likely to have been translated. The code below would need to
947 * be altered somewhat to just be a continuation of testing the currency
950 unsigned int failures = 0, non_ascii = 0;
951 char *save_messages_locale = NULL;
953 /* Like above for LC_CTYPE, we set LC_MESSAGES to the locale of the
954 * desired category, if it isn't that locale already */
956 if (category != LC_MESSAGES) {
958 save_messages_locale = stdize_locale(savepv(setlocale(LC_MESSAGES,
960 if (! save_messages_locale) {
961 goto cant_use_messages;
964 if (strEQ(save_messages_locale, save_input_locale)) {
965 Safefree(save_input_locale);
967 else if (! setlocale(LC_MESSAGES, save_input_locale)) {
968 Safefree(save_messages_locale);
969 goto cant_use_messages;
973 /* Here the current LC_MESSAGES is set to the locale of the category
974 * whose information is desired. Look through all the messages */
977 #ifdef HAS_SYS_ERRLIST
982 const U8* const errmsg = (U8 *) Strerror(e) ;
985 if (! is_utf8_string(errmsg, 0)) {
989 else if (! is_ascii_string(errmsg, 0)) {
994 /* And, if we changed it, restore LC_MESSAGES to its original locale */
995 if (save_messages_locale) {
996 setlocale(LC_MESSAGES, save_messages_locale);
997 Safefree(save_messages_locale);
1000 /* Any non-UTF-8 message means not a UTF-8 locale; if all are valid,
1001 * any non-ascii means it is one; otherwise we assume it isn't */
1002 return (failures) ? FALSE : non_ascii;
1009 Safefree(save_input_locale);
1017 * c-indentation-style: bsd
1019 * indent-tabs-mode: nil
1022 * ex: set ts=8 sts=4 sw=4 et: