Commit | Line | Data |
98994639 |
1 | /* locale.c |
2 | * |
4bb101f2 |
3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
acde74e1 |
4 | * 2000, 2001, 2002, 2003, 2005, 2006, by Larry Wall and others |
98994639 |
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 | /* |
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! |
19 | */ |
20 | |
166f8a29 |
21 | /* utility functions for handling locale-specific stuff like what |
22 | * character represents the decimal point. |
23 | */ |
24 | |
98994639 |
25 | #include "EXTERN.h" |
26 | #define PERL_IN_LOCALE_C |
27 | #include "perl.h" |
28 | |
29 | #ifdef I_LOCALE |
30 | # include <locale.h> |
31 | #endif |
32 | |
b310b053 |
33 | #ifdef I_LANGINFO |
34 | # include <langinfo.h> |
35 | #endif |
36 | |
a4af207c |
37 | #include "reentr.h" |
38 | |
27da23d5 |
39 | #if defined(USE_LOCALE_NUMERIC) || defined(USE_LOCALE_COLLATE) |
98994639 |
40 | /* |
41 | * Standardize the locale name from a string returned by 'setlocale'. |
42 | * |
43 | * The standard return value of setlocale() is either |
44 | * (1) "xx_YY" if the first argument of setlocale() is not LC_ALL |
45 | * (2) "xa_YY xb_YY ..." if the first argument of setlocale() is LC_ALL |
46 | * (the space-separated values represent the various sublocales, |
47 | * in some unspecificed order) |
48 | * |
49 | * In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n", |
50 | * which is harmful for further use of the string in setlocale(). |
51 | * |
52 | */ |
53 | STATIC char * |
54 | S_stdize_locale(pTHX_ char *locs) |
55 | { |
7452cf6a |
56 | const char * const s = strchr(locs, '='); |
98994639 |
57 | bool okay = TRUE; |
58 | |
8772537c |
59 | if (s) { |
60 | const char * const t = strchr(s, '.'); |
98994639 |
61 | okay = FALSE; |
8772537c |
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 |
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 |
98994639 |
79 | |
80 | void |
81 | Perl_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 | |
98994639 |
88 | if (lc && lc->decimal_point) { |
89 | if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) { |
90 | SvREFCNT_dec(PL_numeric_radix_sv); |
91 | PL_numeric_radix_sv = Nullsv; |
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 |
101 | PL_numeric_radix_sv = Nullsv; |
102 | # endif /* HAS_LOCALECONV */ |
103 | #endif /* USE_LOCALE_NUMERIC */ |
104 | } |
105 | |
106 | /* |
107 | * Set up for a new numeric locale. |
108 | */ |
109 | void |
8772537c |
110 | Perl_new_numeric(pTHX_ const char *newnum) |
98994639 |
111 | { |
112 | #ifdef USE_LOCALE_NUMERIC |
97aff369 |
113 | dVAR; |
98994639 |
114 | |
115 | if (! newnum) { |
43c5f42d |
116 | Safefree(PL_numeric_name); |
117 | PL_numeric_name = NULL; |
98994639 |
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 |
126 | PL_numeric_standard = ((*newnum == 'C' && newnum[1] == '\0') |
127 | || strEQ(newnum, "POSIX")); |
98994639 |
128 | PL_numeric_local = TRUE; |
129 | set_numeric_radix(); |
130 | } |
131 | |
132 | #endif /* USE_LOCALE_NUMERIC */ |
133 | } |
134 | |
135 | void |
136 | Perl_set_numeric_standard(pTHX) |
137 | { |
138 | #ifdef USE_LOCALE_NUMERIC |
97aff369 |
139 | dVAR; |
98994639 |
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 | |
151 | void |
152 | Perl_set_numeric_local(pTHX) |
153 | { |
154 | #ifdef USE_LOCALE_NUMERIC |
97aff369 |
155 | dVAR; |
98994639 |
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 | */ |
170 | void |
8772537c |
171 | Perl_new_ctype(pTHX_ const char *newctype) |
98994639 |
172 | { |
173 | #ifdef USE_LOCALE_CTYPE |
27da23d5 |
174 | dVAR; |
98994639 |
175 | int i; |
176 | |
177 | for (i = 0; i < 256; i++) { |
178 | if (isUPPER_LC(i)) |
179 | PL_fold_locale[i] = toLOWER_LC(i); |
180 | else if (isLOWER_LC(i)) |
181 | PL_fold_locale[i] = toUPPER_LC(i); |
182 | else |
183 | PL_fold_locale[i] = i; |
184 | } |
185 | |
186 | #endif /* USE_LOCALE_CTYPE */ |
8772537c |
187 | PERL_UNUSED_ARG(newctype); |
98994639 |
188 | } |
189 | |
190 | /* |
191 | * Set up for a new collation locale. |
192 | */ |
193 | void |
8772537c |
194 | Perl_new_collate(pTHX_ const char *newcoll) |
98994639 |
195 | { |
196 | #ifdef USE_LOCALE_COLLATE |
97aff369 |
197 | dVAR; |
98994639 |
198 | |
199 | if (! newcoll) { |
200 | if (PL_collation_name) { |
201 | ++PL_collation_ix; |
202 | Safefree(PL_collation_name); |
203 | PL_collation_name = NULL; |
204 | } |
205 | PL_collation_standard = TRUE; |
206 | PL_collxfrm_base = 0; |
207 | PL_collxfrm_mult = 2; |
208 | return; |
209 | } |
210 | |
211 | if (! PL_collation_name || strNE(PL_collation_name, newcoll)) { |
212 | ++PL_collation_ix; |
213 | Safefree(PL_collation_name); |
214 | PL_collation_name = stdize_locale(savepv(newcoll)); |
770526c1 |
215 | PL_collation_standard = ((*newcoll == 'C' && newcoll[1] == '\0') |
216 | || strEQ(newcoll, "POSIX")); |
98994639 |
217 | |
218 | { |
219 | /* 2: at most so many chars ('a', 'b'). */ |
220 | /* 50: surely no system expands a char more. */ |
221 | #define XFRMBUFSIZE (2 * 50) |
222 | char xbuf[XFRMBUFSIZE]; |
8772537c |
223 | const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE); |
224 | const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE); |
225 | const SSize_t mult = fb - fa; |
98994639 |
226 | if (mult < 1) |
227 | Perl_croak(aTHX_ "strxfrm() gets absurd"); |
eb160463 |
228 | PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0; |
98994639 |
229 | PL_collxfrm_mult = mult; |
230 | } |
231 | } |
232 | |
233 | #endif /* USE_LOCALE_COLLATE */ |
234 | } |
235 | |
236 | /* |
237 | * Initialize locale awareness. |
238 | */ |
239 | int |
240 | Perl_init_i18nl10n(pTHX_ int printwarn) |
241 | { |
242 | int ok = 1; |
243 | /* returns |
244 | * 1 = set ok or not applicable, |
245 | * 0 = fallback to C locale, |
246 | * -1 = fallback to C locale failed |
247 | */ |
248 | |
249 | #if defined(USE_LOCALE) |
97aff369 |
250 | dVAR; |
98994639 |
251 | |
252 | #ifdef USE_LOCALE_CTYPE |
253 | char *curctype = NULL; |
254 | #endif /* USE_LOCALE_CTYPE */ |
255 | #ifdef USE_LOCALE_COLLATE |
256 | char *curcoll = NULL; |
257 | #endif /* USE_LOCALE_COLLATE */ |
258 | #ifdef USE_LOCALE_NUMERIC |
259 | char *curnum = NULL; |
260 | #endif /* USE_LOCALE_NUMERIC */ |
261 | #ifdef __GLIBC__ |
7452cf6a |
262 | char * const language = PerlEnv_getenv("LANGUAGE"); |
98994639 |
263 | #endif |
7452cf6a |
264 | char * const lc_all = PerlEnv_getenv("LC_ALL"); |
265 | char * const lang = PerlEnv_getenv("LANG"); |
98994639 |
266 | bool setlocale_failure = FALSE; |
267 | |
268 | #ifdef LOCALE_ENVIRON_REQUIRED |
269 | |
270 | /* |
271 | * Ultrix setlocale(..., "") fails if there are no environment |
272 | * variables from which to get a locale name. |
273 | */ |
274 | |
275 | bool done = FALSE; |
276 | |
277 | #ifdef LC_ALL |
278 | if (lang) { |
279 | if (setlocale(LC_ALL, "")) |
280 | done = TRUE; |
281 | else |
282 | setlocale_failure = TRUE; |
283 | } |
284 | if (!setlocale_failure) { |
285 | #ifdef USE_LOCALE_CTYPE |
286 | if (! (curctype = |
287 | setlocale(LC_CTYPE, |
288 | (!done && (lang || PerlEnv_getenv("LC_CTYPE"))) |
289 | ? "" : Nullch))) |
290 | setlocale_failure = TRUE; |
291 | else |
292 | curctype = savepv(curctype); |
293 | #endif /* USE_LOCALE_CTYPE */ |
294 | #ifdef USE_LOCALE_COLLATE |
295 | if (! (curcoll = |
296 | setlocale(LC_COLLATE, |
297 | (!done && (lang || PerlEnv_getenv("LC_COLLATE"))) |
298 | ? "" : Nullch))) |
299 | setlocale_failure = TRUE; |
300 | else |
301 | curcoll = savepv(curcoll); |
302 | #endif /* USE_LOCALE_COLLATE */ |
303 | #ifdef USE_LOCALE_NUMERIC |
304 | if (! (curnum = |
305 | setlocale(LC_NUMERIC, |
306 | (!done && (lang || PerlEnv_getenv("LC_NUMERIC"))) |
307 | ? "" : Nullch))) |
308 | setlocale_failure = TRUE; |
309 | else |
310 | curnum = savepv(curnum); |
311 | #endif /* USE_LOCALE_NUMERIC */ |
312 | } |
313 | |
314 | #endif /* LC_ALL */ |
315 | |
316 | #endif /* !LOCALE_ENVIRON_REQUIRED */ |
317 | |
318 | #ifdef LC_ALL |
319 | if (! setlocale(LC_ALL, "")) |
320 | setlocale_failure = TRUE; |
321 | #endif /* LC_ALL */ |
322 | |
323 | if (!setlocale_failure) { |
324 | #ifdef USE_LOCALE_CTYPE |
325 | if (! (curctype = setlocale(LC_CTYPE, ""))) |
326 | setlocale_failure = TRUE; |
327 | else |
328 | curctype = savepv(curctype); |
329 | #endif /* USE_LOCALE_CTYPE */ |
330 | #ifdef USE_LOCALE_COLLATE |
331 | if (! (curcoll = setlocale(LC_COLLATE, ""))) |
332 | setlocale_failure = TRUE; |
333 | else |
334 | curcoll = savepv(curcoll); |
335 | #endif /* USE_LOCALE_COLLATE */ |
336 | #ifdef USE_LOCALE_NUMERIC |
337 | if (! (curnum = setlocale(LC_NUMERIC, ""))) |
338 | setlocale_failure = TRUE; |
339 | else |
340 | curnum = savepv(curnum); |
341 | #endif /* USE_LOCALE_NUMERIC */ |
342 | } |
343 | |
344 | if (setlocale_failure) { |
345 | char *p; |
0bd48802 |
346 | const bool locwarn = (printwarn > 1 || |
98994639 |
347 | (printwarn && |
348 | (!(p = PerlEnv_getenv("PERL_BADLANG")) || atoi(p)))); |
349 | |
350 | if (locwarn) { |
351 | #ifdef LC_ALL |
352 | |
353 | PerlIO_printf(Perl_error_log, |
354 | "perl: warning: Setting locale failed.\n"); |
355 | |
356 | #else /* !LC_ALL */ |
357 | |
358 | PerlIO_printf(Perl_error_log, |
359 | "perl: warning: Setting locale failed for the categories:\n\t"); |
360 | #ifdef USE_LOCALE_CTYPE |
361 | if (! curctype) |
362 | PerlIO_printf(Perl_error_log, "LC_CTYPE "); |
363 | #endif /* USE_LOCALE_CTYPE */ |
364 | #ifdef USE_LOCALE_COLLATE |
365 | if (! curcoll) |
366 | PerlIO_printf(Perl_error_log, "LC_COLLATE "); |
367 | #endif /* USE_LOCALE_COLLATE */ |
368 | #ifdef USE_LOCALE_NUMERIC |
369 | if (! curnum) |
370 | PerlIO_printf(Perl_error_log, "LC_NUMERIC "); |
371 | #endif /* USE_LOCALE_NUMERIC */ |
372 | PerlIO_printf(Perl_error_log, "\n"); |
373 | |
374 | #endif /* LC_ALL */ |
375 | |
376 | PerlIO_printf(Perl_error_log, |
377 | "perl: warning: Please check that your locale settings:\n"); |
378 | |
379 | #ifdef __GLIBC__ |
380 | PerlIO_printf(Perl_error_log, |
381 | "\tLANGUAGE = %c%s%c,\n", |
382 | language ? '"' : '(', |
383 | language ? language : "unset", |
384 | language ? '"' : ')'); |
385 | #endif |
386 | |
387 | PerlIO_printf(Perl_error_log, |
388 | "\tLC_ALL = %c%s%c,\n", |
389 | lc_all ? '"' : '(', |
390 | lc_all ? lc_all : "unset", |
391 | lc_all ? '"' : ')'); |
392 | |
393 | #if defined(USE_ENVIRON_ARRAY) |
394 | { |
395 | char **e; |
396 | for (e = environ; *e; e++) { |
397 | if (strnEQ(*e, "LC_", 3) |
398 | && strnNE(*e, "LC_ALL=", 7) |
399 | && (p = strchr(*e, '='))) |
400 | PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n", |
401 | (int)(p - *e), *e, p + 1); |
402 | } |
403 | } |
404 | #else |
405 | PerlIO_printf(Perl_error_log, |
406 | "\t(possibly more locale environment variables)\n"); |
407 | #endif |
408 | |
409 | PerlIO_printf(Perl_error_log, |
410 | "\tLANG = %c%s%c\n", |
411 | lang ? '"' : '(', |
412 | lang ? lang : "unset", |
413 | lang ? '"' : ')'); |
414 | |
415 | PerlIO_printf(Perl_error_log, |
416 | " are supported and installed on your system.\n"); |
417 | } |
418 | |
419 | #ifdef LC_ALL |
420 | |
421 | if (setlocale(LC_ALL, "C")) { |
422 | if (locwarn) |
423 | PerlIO_printf(Perl_error_log, |
424 | "perl: warning: Falling back to the standard locale (\"C\").\n"); |
425 | ok = 0; |
426 | } |
427 | else { |
428 | if (locwarn) |
429 | PerlIO_printf(Perl_error_log, |
430 | "perl: warning: Failed to fall back to the standard locale (\"C\").\n"); |
431 | ok = -1; |
432 | } |
433 | |
434 | #else /* ! LC_ALL */ |
435 | |
436 | if (0 |
437 | #ifdef USE_LOCALE_CTYPE |
438 | || !(curctype || setlocale(LC_CTYPE, "C")) |
439 | #endif /* USE_LOCALE_CTYPE */ |
440 | #ifdef USE_LOCALE_COLLATE |
441 | || !(curcoll || setlocale(LC_COLLATE, "C")) |
442 | #endif /* USE_LOCALE_COLLATE */ |
443 | #ifdef USE_LOCALE_NUMERIC |
444 | || !(curnum || setlocale(LC_NUMERIC, "C")) |
445 | #endif /* USE_LOCALE_NUMERIC */ |
446 | ) |
447 | { |
448 | if (locwarn) |
449 | PerlIO_printf(Perl_error_log, |
450 | "perl: warning: Cannot fall back to the standard locale (\"C\").\n"); |
451 | ok = -1; |
452 | } |
453 | |
454 | #endif /* ! LC_ALL */ |
455 | |
456 | #ifdef USE_LOCALE_CTYPE |
457 | curctype = savepv(setlocale(LC_CTYPE, Nullch)); |
458 | #endif /* USE_LOCALE_CTYPE */ |
459 | #ifdef USE_LOCALE_COLLATE |
460 | curcoll = savepv(setlocale(LC_COLLATE, Nullch)); |
461 | #endif /* USE_LOCALE_COLLATE */ |
462 | #ifdef USE_LOCALE_NUMERIC |
463 | curnum = savepv(setlocale(LC_NUMERIC, Nullch)); |
464 | #endif /* USE_LOCALE_NUMERIC */ |
465 | } |
466 | else { |
467 | |
468 | #ifdef USE_LOCALE_CTYPE |
469 | new_ctype(curctype); |
470 | #endif /* USE_LOCALE_CTYPE */ |
471 | |
472 | #ifdef USE_LOCALE_COLLATE |
473 | new_collate(curcoll); |
474 | #endif /* USE_LOCALE_COLLATE */ |
475 | |
476 | #ifdef USE_LOCALE_NUMERIC |
477 | new_numeric(curnum); |
478 | #endif /* USE_LOCALE_NUMERIC */ |
b310b053 |
479 | |
98994639 |
480 | } |
481 | |
482 | #endif /* USE_LOCALE */ |
483 | |
ec71e770 |
484 | #ifdef USE_PERLIO |
b310b053 |
485 | { |
fde18df1 |
486 | /* Set PL_utf8locale to TRUE if using PerlIO _and_ |
ec71e770 |
487 | any of the following are true: |
085a54d9 |
488 | - nl_langinfo(CODESET) contains /^utf-?8/i |
61de9fb5 |
489 | - $ENV{LC_ALL} contains /^utf-?8/i |
085a54d9 |
490 | - $ENV{LC_CTYPE} contains /^utf-?8/i |
61de9fb5 |
491 | - $ENV{LANG} contains /^utf-?8/i |
492 | The LC_ALL, LC_CTYPE, LANG obey the usual override |
493 | hierarchy of locale environment variables. (LANGUAGE |
494 | affects only LC_MESSAGES only under glibc.) (If present, |
495 | it overrides LC_MESSAGES for GNU gettext, and it also |
496 | can have more than one locale, separated by spaces, |
497 | in case you need to know.) |
8aa8f774 |
498 | If PL_utf8locale and PL_unicode (set by -C or by $ENV{PERL_UNICODE}) |
a05d7ebb |
499 | are true, perl.c:S_parse_body() will turn on the PerlIO :utf8 layer |
fde18df1 |
500 | on STDIN, STDOUT, STDERR, _and_ the default open discipline. |
085a54d9 |
501 | */ |
fde18df1 |
502 | bool utf8locale = FALSE; |
b310b053 |
503 | char *codeset = NULL; |
504 | #if defined(HAS_NL_LANGINFO) && defined(CODESET) |
505 | codeset = nl_langinfo(CODESET); |
506 | #endif |
61de9fb5 |
507 | if (codeset) |
89529cee |
508 | utf8locale = (Perl_ibcmp(aTHX_ codeset, STR_WITH_LEN("UTF-8")) == 0 || |
509 | Perl_ibcmp(aTHX_ codeset, STR_WITH_LEN("UTF8") ) == 0); |
077a72a9 |
510 | #if defined(USE_LOCALE) |
61de9fb5 |
511 | else { /* nl_langinfo(CODESET) is supposed to correctly |
512 | * interpret the locale environment variables, |
513 | * but just in case it fails, let's do this manually. */ |
514 | if (lang) |
89529cee |
515 | utf8locale = (Perl_ibcmp(aTHX_ lang, STR_WITH_LEN("UTF-8")) == 0 || |
516 | Perl_ibcmp(aTHX_ lang, STR_WITH_LEN("UTF8") ) == 0); |
b310b053 |
517 | #ifdef USE_LOCALE_CTYPE |
61de9fb5 |
518 | if (curctype) |
89529cee |
519 | utf8locale = (Perl_ibcmp(aTHX_ curctype, STR_WITH_LEN("UTF-8")) == 0 || |
520 | Perl_ibcmp(aTHX_ curctype, STR_WITH_LEN("UTF8") ) == 0); |
b310b053 |
521 | #endif |
61de9fb5 |
522 | if (lc_all) |
89529cee |
523 | utf8locale = (Perl_ibcmp(aTHX_ lc_all, STR_WITH_LEN("UTF-8")) == 0 || |
524 | Perl_ibcmp(aTHX_ lc_all, STR_WITH_LEN("UTF8") ) == 0); |
61de9fb5 |
525 | } |
fde18df1 |
526 | #endif /* USE_LOCALE */ |
527 | if (utf8locale) |
528 | PL_utf8locale = TRUE; |
529 | } |
a05d7ebb |
530 | /* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO. |
fde18df1 |
531 | This is an alternative to using the -C command line switch |
532 | (the -C if present will override this). */ |
533 | { |
dd374669 |
534 | const char *p = PerlEnv_getenv("PERL_UNICODE"); |
a05d7ebb |
535 | PL_unicode = p ? parse_unicode_opts(&p) : 0; |
b310b053 |
536 | } |
ec71e770 |
537 | #endif |
b310b053 |
538 | |
98994639 |
539 | #ifdef USE_LOCALE_CTYPE |
43c5f42d |
540 | Safefree(curctype); |
98994639 |
541 | #endif /* USE_LOCALE_CTYPE */ |
542 | #ifdef USE_LOCALE_COLLATE |
43c5f42d |
543 | Safefree(curcoll); |
98994639 |
544 | #endif /* USE_LOCALE_COLLATE */ |
545 | #ifdef USE_LOCALE_NUMERIC |
43c5f42d |
546 | Safefree(curnum); |
98994639 |
547 | #endif /* USE_LOCALE_NUMERIC */ |
548 | return ok; |
549 | } |
550 | |
98994639 |
551 | #ifdef USE_LOCALE_COLLATE |
552 | |
553 | /* |
554 | * mem_collxfrm() is a bit like strxfrm() but with two important |
555 | * differences. First, it handles embedded NULs. Second, it allocates |
556 | * a bit more memory than needed for the transformed data itself. |
557 | * The real transformed data begins at offset sizeof(collationix). |
558 | * Please see sv_collxfrm() to see how this is used. |
559 | */ |
166f8a29 |
560 | |
98994639 |
561 | char * |
562 | Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen) |
563 | { |
97aff369 |
564 | dVAR; |
98994639 |
565 | char *xbuf; |
566 | STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */ |
567 | |
568 | /* the first sizeof(collationix) bytes are used by sv_collxfrm(). */ |
569 | /* the +1 is for the terminating NUL. */ |
570 | |
571 | xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1; |
a02a5408 |
572 | Newx(xbuf, xAlloc, char); |
98994639 |
573 | if (! xbuf) |
574 | goto bad; |
575 | |
576 | *(U32*)xbuf = PL_collation_ix; |
577 | xout = sizeof(PL_collation_ix); |
578 | for (xin = 0; xin < len; ) { |
579 | SSize_t xused; |
580 | |
581 | for (;;) { |
582 | xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout); |
583 | if (xused == -1) |
584 | goto bad; |
eb160463 |
585 | if ((STRLEN)xused < xAlloc - xout) |
98994639 |
586 | break; |
587 | xAlloc = (2 * xAlloc) + 1; |
588 | Renew(xbuf, xAlloc, char); |
589 | if (! xbuf) |
590 | goto bad; |
591 | } |
592 | |
593 | xin += strlen(s + xin) + 1; |
594 | xout += xused; |
595 | |
596 | /* Embedded NULs are understood but silently skipped |
597 | * because they make no sense in locale collation. */ |
598 | } |
599 | |
600 | xbuf[xout] = '\0'; |
601 | *xlen = xout - sizeof(PL_collation_ix); |
602 | return xbuf; |
603 | |
604 | bad: |
605 | Safefree(xbuf); |
606 | *xlen = 0; |
607 | return NULL; |
608 | } |
609 | |
610 | #endif /* USE_LOCALE_COLLATE */ |
611 | |
66610fdd |
612 | /* |
613 | * Local variables: |
614 | * c-indentation-style: bsd |
615 | * c-basic-offset: 4 |
616 | * indent-tabs-mode: t |
617 | * End: |
618 | * |
37442d52 |
619 | * ex: set ts=8 sts=4 sw=4 noet: |
620 | */ |