1 /* $NetBSD: strftime.c,v 1.29 2013/09/20 19:06:54 christos Exp $ */ 2 3 #include <sys/cdefs.h> 4 #if defined(LIBC_SCCS) && !defined(lint) 5 #if 0 6 static char elsieid[] = "@(#)strftime.c 7.64"; 7 static char elsieid[] = "@(#)strftime.c 8.3"; 8 #else 9 __RCSID("$NetBSD: strftime.c,v 1.29 2013/09/20 19:06:54 christos Exp $"); 10 #endif 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 15 #include <stddef.h> 16 #include <locale.h> 17 #include "setlocale_local.h" 18 19 /* 20 ** Based on the UCB version with the copyright notice and sccsid 21 ** appearing below. 22 ** 23 ** This is ANSIish only when "multibyte character == plain character". 24 */ 25 26 #include "private.h" 27 28 /* 29 ** We don't use these extensions in strftime operation even when 30 ** supported by the local tzcode configuration. A strictly 31 ** conforming C application may leave them in undefined state. 32 */ 33 34 #ifdef _LIBC 35 #undef TM_ZONE 36 #undef TM_GMTOFF 37 #endif 38 39 /* 40 ** Copyright (c) 1989, 1993 41 ** The Regents of the University of California. All rights reserved. 42 ** 43 ** Redistribution and use in source and binary forms, with or without 44 ** modification, are permitted provided that the following conditions 45 ** are met: 46 ** 1. Redistributions of source code must retain the above copyright 47 ** notice, this list of conditions and the following disclaimer. 48 ** 2. Redistributions in binary form must reproduce the above copyright 49 ** notice, this list of conditions and the following disclaimer in the 50 ** documentation and/or other materials provided with the distribution. 51 ** 3. All advertising materials mentioning features or use of this software 52 ** must display the following acknowledgement: 53 ** This product includes software developed by the University of 54 ** California, Berkeley and its contributors. 55 ** 4. Neither the name of the University nor the names of its contributors 56 ** may be used to endorse or promote products derived from this software 57 ** without specific prior written permission. 58 ** 59 ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 ** SUCH DAMAGE. 70 */ 71 72 #ifndef LIBC_SCCS 73 #ifndef lint 74 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 75 #endif /* !defined lint */ 76 #endif /* !defined LIBC_SCCS */ 77 78 #include "tzfile.h" 79 #include "fcntl.h" 80 #include "locale.h" 81 82 #ifdef __weak_alias 83 __weak_alias(strftime_l, _strftime_l) 84 __weak_alias(strftime_lz, _strftime_lz) 85 __weak_alias(strftime_z, _strftime_z) 86 #endif 87 88 #include "sys/localedef.h" 89 #define _TIME_LOCALE(loc) \ 90 ((_TimeLocale *)((loc)->part_impl[(size_t)LC_TIME])) 91 #define c_fmt d_t_fmt 92 93 static char * _add(const char *, char *, const char *); 94 static char * _conv(int, const char *, char *, const char *); 95 static char * _fmt(const timezone_t, const char *, const struct tm *, char *, 96 const char *, int *, locale_t); 97 static char * _yconv(int, int, int, int, char *, const char *); 98 99 extern char * tzname[]; 100 101 #ifndef YEAR_2000_NAME 102 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" 103 #endif /* !defined YEAR_2000_NAME */ 104 105 #define IN_NONE 0 106 #define IN_SOME 1 107 #define IN_THIS 2 108 #define IN_ALL 3 109 110 size_t 111 strftime_z(const timezone_t sp, char * __restrict s, size_t maxsize, 112 const char * __restrict format, const struct tm * __restrict t) 113 { 114 return strftime_lz(sp, s, maxsize, format, t, _current_locale()); 115 } 116 117 size_t 118 strftime_lz(const timezone_t sp, char *const s, const size_t maxsize, 119 const char *const format, const struct tm *const t, locale_t loc) 120 { 121 char * p; 122 int warn; 123 124 warn = IN_NONE; 125 p = _fmt(sp, ((format == NULL) ? "%c" : format), t, s, s + maxsize, 126 &warn, loc); 127 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 128 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { 129 (void) fprintf(stderr, "\n"); 130 if (format == NULL) 131 (void) fprintf(stderr, "NULL strftime format "); 132 else (void) fprintf(stderr, "strftime format \"%s\" ", 133 format); 134 (void) fprintf(stderr, "yields only two digits of years in "); 135 if (warn == IN_SOME) 136 (void) fprintf(stderr, "some locales"); 137 else if (warn == IN_THIS) 138 (void) fprintf(stderr, "the current locale"); 139 else (void) fprintf(stderr, "all locales"); 140 (void) fprintf(stderr, "\n"); 141 } 142 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ 143 if (p == s + maxsize) 144 return 0; 145 *p = '\0'; 146 return p - s; 147 } 148 149 static char * 150 _fmt(const timezone_t sp, const char *format, const struct tm *const t, 151 char *pt, const char *const ptlim, int *warnp, locale_t loc) 152 { 153 for ( ; *format; ++format) { 154 if (*format == '%') { 155 label: 156 switch (*++format) { 157 case '\0': 158 --format; 159 break; 160 case 'A': 161 pt = _add((t->tm_wday < 0 || 162 t->tm_wday >= DAYSPERWEEK) ? 163 "?" : _TIME_LOCALE(loc)->day[t->tm_wday], 164 pt, ptlim); 165 continue; 166 case 'a': 167 pt = _add((t->tm_wday < 0 || 168 t->tm_wday >= DAYSPERWEEK) ? 169 "?" : _TIME_LOCALE(loc)->abday[t->tm_wday], 170 pt, ptlim); 171 continue; 172 case 'B': 173 pt = _add((t->tm_mon < 0 || 174 t->tm_mon >= MONSPERYEAR) ? 175 "?" : _TIME_LOCALE(loc)->mon[t->tm_mon], 176 pt, ptlim); 177 continue; 178 case 'b': 179 case 'h': 180 pt = _add((t->tm_mon < 0 || 181 t->tm_mon >= MONSPERYEAR) ? 182 "?" : _TIME_LOCALE(loc)->abmon[t->tm_mon], 183 pt, ptlim); 184 continue; 185 case 'C': 186 /* 187 ** %C used to do a... 188 ** _fmt("%a %b %e %X %Y", t); 189 ** ...whereas now POSIX 1003.2 calls for 190 ** something completely different. 191 ** (ado, 1993-05-24) 192 */ 193 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 194 pt, ptlim); 195 continue; 196 case 'c': 197 { 198 int warn2 = IN_SOME; 199 200 pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt, 201 ptlim, &warn2, loc); 202 if (warn2 == IN_ALL) 203 warn2 = IN_THIS; 204 if (warn2 > *warnp) 205 *warnp = warn2; 206 } 207 continue; 208 case 'D': 209 pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp, 210 loc); 211 continue; 212 case 'd': 213 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 214 continue; 215 case 'E': 216 case 'O': 217 /* 218 ** C99 locale modifiers. 219 ** The sequences 220 ** %Ec %EC %Ex %EX %Ey %EY 221 ** %Od %oe %OH %OI %Om %OM 222 ** %OS %Ou %OU %OV %Ow %OW %Oy 223 ** are supposed to provide alternate 224 ** representations. 225 */ 226 goto label; 227 case 'e': 228 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 229 continue; 230 case 'F': 231 pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp, 232 loc); 233 continue; 234 case 'H': 235 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 236 continue; 237 case 'I': 238 pt = _conv((t->tm_hour % 12) ? 239 (t->tm_hour % 12) : 12, 240 "%02d", pt, ptlim); 241 continue; 242 case 'j': 243 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 244 continue; 245 case 'k': 246 /* 247 ** This used to be... 248 ** _conv(t->tm_hour % 12 ? 249 ** t->tm_hour % 12 : 12, 2, ' '); 250 ** ...and has been changed to the below to 251 ** match SunOS 4.1.1 and Arnold Robbins' 252 ** strftime version 3.0. That is, "%k" and 253 ** "%l" have been swapped. 254 ** (ado, 1993-05-24) 255 */ 256 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 257 continue; 258 #ifdef KITCHEN_SINK 259 case 'K': 260 /* 261 ** After all this time, still unclaimed! 262 */ 263 pt = _add("kitchen sink", pt, ptlim); 264 continue; 265 #endif /* defined KITCHEN_SINK */ 266 case 'l': 267 /* 268 ** This used to be... 269 ** _conv(t->tm_hour, 2, ' '); 270 ** ...and has been changed to the below to 271 ** match SunOS 4.1.1 and Arnold Robbin's 272 ** strftime version 3.0. That is, "%k" and 273 ** "%l" have been swapped. 274 ** (ado, 1993-05-24) 275 */ 276 pt = _conv((t->tm_hour % 12) ? 277 (t->tm_hour % 12) : 12, 278 "%2d", pt, ptlim); 279 continue; 280 case 'M': 281 pt = _conv(t->tm_min, "%02d", pt, ptlim); 282 continue; 283 case 'm': 284 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 285 continue; 286 case 'n': 287 pt = _add("\n", pt, ptlim); 288 continue; 289 case 'p': 290 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 291 _TIME_LOCALE(loc)->am_pm[1] : 292 _TIME_LOCALE(loc)->am_pm[0], 293 pt, ptlim); 294 continue; 295 case 'R': 296 pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp, 297 loc); 298 continue; 299 case 'r': 300 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt_ampm, t, 301 pt, ptlim, warnp, loc); 302 continue; 303 case 'S': 304 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 305 continue; 306 case 's': 307 { 308 struct tm tm; 309 char buf[INT_STRLEN_MAXIMUM( 310 time_t) + 1]; 311 time_t mkt; 312 313 tm = *t; 314 mkt = mktime(&tm); 315 /* CONSTCOND */ 316 if (TYPE_SIGNED(time_t)) 317 (void)snprintf(buf, sizeof(buf), 318 "%jd", (intmax_t) mkt); 319 else (void)snprintf(buf, sizeof(buf), 320 "%ju", (uintmax_t) mkt); 321 pt = _add(buf, pt, ptlim); 322 } 323 continue; 324 case 'T': 325 pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp, 326 loc); 327 continue; 328 case 't': 329 pt = _add("\t", pt, ptlim); 330 continue; 331 case 'U': 332 pt = _conv((t->tm_yday + DAYSPERWEEK - 333 t->tm_wday) / DAYSPERWEEK, 334 "%02d", pt, ptlim); 335 continue; 336 case 'u': 337 /* 338 ** From Arnold Robbins' strftime version 3.0: 339 ** "ISO 8601: Weekday as a decimal number 340 ** [1 (Monday) - 7]" 341 ** (ado, 1993-05-24) 342 */ 343 pt = _conv((t->tm_wday == 0) ? 344 DAYSPERWEEK : t->tm_wday, 345 "%d", pt, ptlim); 346 continue; 347 case 'V': /* ISO 8601 week number */ 348 case 'G': /* ISO 8601 year (four digits) */ 349 case 'g': /* ISO 8601 year (two digits) */ 350 /* 351 ** From Arnold Robbins' strftime version 3.0: "the week number of the 352 ** year (the first Monday as the first day of week 1) as a decimal number 353 ** (01-53)." 354 ** (ado, 1993-05-24) 355 ** 356 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: 357 ** "Week 01 of a year is per definition the first week which has the 358 ** Thursday in this year, which is equivalent to the week which contains 359 ** the fourth day of January. In other words, the first week of a new year 360 ** is the week which has the majority of its days in the new year. Week 01 361 ** might also contain days from the previous year and the week before week 362 ** 01 of a year is the last week (52 or 53) of the previous year even if 363 ** it contains days from the new year. A week starts with Monday (day 1) 364 ** and ends with Sunday (day 7). For example, the first week of the year 365 ** 1997 lasts from 1996-12-30 to 1997-01-05..." 366 ** (ado, 1996-01-02) 367 */ 368 { 369 int year; 370 int base; 371 int yday; 372 int wday; 373 int w; 374 375 year = t->tm_year; 376 base = TM_YEAR_BASE; 377 yday = t->tm_yday; 378 wday = t->tm_wday; 379 for ( ; ; ) { 380 int len; 381 int bot; 382 int top; 383 384 len = isleap_sum(year, base) ? 385 DAYSPERLYEAR : 386 DAYSPERNYEAR; 387 /* 388 ** What yday (-3 ... 3) does 389 ** the ISO year begin on? 390 */ 391 bot = ((yday + 11 - wday) % 392 DAYSPERWEEK) - 3; 393 /* 394 ** What yday does the NEXT 395 ** ISO year begin on? 396 */ 397 top = bot - 398 (len % DAYSPERWEEK); 399 if (top < -3) 400 top += DAYSPERWEEK; 401 top += len; 402 if (yday >= top) { 403 ++base; 404 w = 1; 405 break; 406 } 407 if (yday >= bot) { 408 w = 1 + ((yday - bot) / 409 DAYSPERWEEK); 410 break; 411 } 412 --base; 413 yday += isleap_sum(year, base) ? 414 DAYSPERLYEAR : 415 DAYSPERNYEAR; 416 } 417 #ifdef XPG4_1994_04_09 418 if ((w == 52 && 419 t->tm_mon == TM_JANUARY) || 420 (w == 1 && 421 t->tm_mon == TM_DECEMBER)) 422 w = 53; 423 #endif /* defined XPG4_1994_04_09 */ 424 if (*format == 'V') 425 pt = _conv(w, "%02d", 426 pt, ptlim); 427 else if (*format == 'g') { 428 *warnp = IN_ALL; 429 pt = _yconv(year, base, 0, 1, 430 pt, ptlim); 431 } else pt = _yconv(year, base, 1, 1, 432 pt, ptlim); 433 } 434 continue; 435 case 'v': 436 /* 437 ** From Arnold Robbins' strftime version 3.0: 438 ** "date as dd-bbb-YYYY" 439 ** (ado, 1993-05-24) 440 */ 441 pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp, 442 loc); 443 continue; 444 case 'W': 445 pt = _conv((t->tm_yday + DAYSPERWEEK - 446 (t->tm_wday ? 447 (t->tm_wday - 1) : 448 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 449 "%02d", pt, ptlim); 450 continue; 451 case 'w': 452 pt = _conv(t->tm_wday, "%d", pt, ptlim); 453 continue; 454 case 'X': 455 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt, t, pt, 456 ptlim, warnp, loc); 457 continue; 458 case 'x': 459 { 460 int warn2 = IN_SOME; 461 462 pt = _fmt(sp, _TIME_LOCALE(loc)->d_fmt, t, pt, 463 ptlim, &warn2, loc); 464 if (warn2 == IN_ALL) 465 warn2 = IN_THIS; 466 if (warn2 > *warnp) 467 *warnp = warn2; 468 } 469 continue; 470 case 'y': 471 *warnp = IN_ALL; 472 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, 473 pt, ptlim); 474 continue; 475 case 'Y': 476 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, 477 pt, ptlim); 478 continue; 479 case 'Z': 480 #ifdef TM_ZONE 481 if (t->TM_ZONE != NULL) 482 pt = _add(t->TM_ZONE, pt, ptlim); 483 else 484 #endif /* defined TM_ZONE */ 485 if (t->tm_isdst >= 0) 486 pt = _add((sp ? 487 tzgetname(sp, t->tm_isdst) : 488 tzname[t->tm_isdst != 0]), 489 pt, ptlim); 490 /* 491 ** C99 says that %Z must be replaced by the 492 ** empty string if the time zone is not 493 ** determinable. 494 */ 495 continue; 496 case 'z': 497 { 498 int diff; 499 char const * sign; 500 501 if (t->tm_isdst < 0) 502 continue; 503 #ifdef TM_GMTOFF 504 diff = (int)t->TM_GMTOFF; 505 #else /* !defined TM_GMTOFF */ 506 /* 507 ** C99 says that the UT offset must 508 ** be computed by looking only at 509 ** tm_isdst. This requirement is 510 ** incorrect, since it means the code 511 ** must rely on magic (in this case 512 ** altzone and timezone), and the 513 ** magic might not have the correct 514 ** offset. Doing things correctly is 515 ** tricky and requires disobeying C99; 516 ** see GNU C strftime for details. 517 ** For now, punt and conform to the 518 ** standard, even though it's incorrect. 519 ** 520 ** C99 says that %z must be replaced by the 521 ** empty string if the time zone is not 522 ** determinable, so output nothing if the 523 ** appropriate variables are not available. 524 */ 525 #ifndef STD_INSPIRED 526 if (t->tm_isdst == 0) 527 #ifdef USG_COMPAT 528 diff = -timezone; 529 #else /* !defined USG_COMPAT */ 530 continue; 531 #endif /* !defined USG_COMPAT */ 532 else 533 #ifdef ALTZONE 534 diff = -altzone; 535 #else /* !defined ALTZONE */ 536 continue; 537 #endif /* !defined ALTZONE */ 538 #else /* defined STD_INSPIRED */ 539 { 540 struct tm tmp; 541 time_t lct, gct; 542 543 /* 544 ** Get calendar time from t 545 ** being treated as local. 546 */ 547 tmp = *t; /* mktime discards const */ 548 lct = mktime(&tmp); 549 550 if (lct == (time_t)-1) 551 continue; 552 553 /* 554 ** Get calendar time from t 555 ** being treated as GMT. 556 **/ 557 tmp = *t; /* mktime discards const */ 558 gct = timegm(&tmp); 559 560 if (gct == (time_t)-1) 561 continue; 562 563 /* LINTED difference will fit int */ 564 diff = (intmax_t)gct - (intmax_t)lct; 565 } 566 #endif /* defined STD_INSPIRED */ 567 #endif /* !defined TM_GMTOFF */ 568 if (diff < 0) { 569 sign = "-"; 570 diff = -diff; 571 } else sign = "+"; 572 pt = _add(sign, pt, ptlim); 573 diff /= SECSPERMIN; 574 diff = (diff / MINSPERHOUR) * 100 + 575 (diff % MINSPERHOUR); 576 pt = _conv(diff, "%04d", pt, ptlim); 577 } 578 continue; 579 #if defined(__minix) 580 case '+': 581 pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt, ptlim, warnp, loc); 582 continue; 583 #endif /* defined(__minix) */ 584 #if 0 585 case '+': 586 pt = _fmt(sp, _TIME_LOCALE(loc)->date_fmt, t, 587 pt, ptlim, warnp, loc); 588 continue; 589 #endif 590 case '%': 591 /* 592 ** X311J/88-090 (4.12.3.5): if conversion char is 593 ** undefined, behavior is undefined. Print out the 594 ** character itself as printf(3) also does. 595 */ 596 default: 597 break; 598 } 599 } 600 if (pt == ptlim) 601 break; 602 *pt++ = *format; 603 } 604 return pt; 605 } 606 607 size_t 608 strftime(char * const s, const size_t maxsize, 609 const char * const format, const struct tm * const t) 610 { 611 tzset(); 612 return strftime_z(NULL, s, maxsize, format, t); 613 } 614 615 size_t 616 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format, 617 const struct tm * __restrict t, locale_t loc) 618 { 619 tzset(); 620 return strftime_lz(NULL, s, maxsize, format, t, loc); 621 } 622 623 static char * 624 _conv(const int n, const char *const format, char *const pt, 625 const char *const ptlim) 626 { 627 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 628 629 (void) snprintf(buf, sizeof(buf), format, n); 630 return _add(buf, pt, ptlim); 631 } 632 633 static char * 634 _add(const char *str, char *pt, const char *const ptlim) 635 { 636 while (pt < ptlim && (*pt = *str++) != '\0') 637 ++pt; 638 return pt; 639 } 640 641 /* 642 ** POSIX and the C Standard are unclear or inconsistent about 643 ** what %C and %y do if the year is negative or exceeds 9999. 644 ** Use the convention that %C concatenated with %y yields the 645 ** same output as %Y, and that %Y contains at least 4 bytes, 646 ** with more only if necessary. 647 */ 648 649 static char * 650 _yconv(const int a, const int b, const int convert_top, const int convert_yy, 651 char *pt, const char *const ptlim) 652 { 653 int lead; 654 int trail; 655 656 #define DIVISOR 100 657 trail = a % DIVISOR + b % DIVISOR; 658 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 659 trail %= DIVISOR; 660 if (trail < 0 && lead > 0) { 661 trail += DIVISOR; 662 --lead; 663 } else if (lead < 0 && trail > 0) { 664 trail -= DIVISOR; 665 ++lead; 666 } 667 if (convert_top) { 668 if (lead == 0 && trail < 0) 669 pt = _add("-0", pt, ptlim); 670 else pt = _conv(lead, "%02d", pt, ptlim); 671 } 672 if (convert_yy) 673 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); 674 return pt; 675 } 676 677 #ifdef LOCALE_HOME 678 static struct lc_time_T * 679 _loc(void) 680 { 681 static const char locale_home[] = LOCALE_HOME; 682 static const char lc_time[] = "LC_TIME"; 683 static char * locale_buf; 684 685 int fd; 686 int oldsun; /* "...ain't got nothin' to do..." */ 687 char * lbuf; 688 char * name; 689 char * p; 690 const char ** ap; 691 const char * plim; 692 char filename[FILENAME_MAX]; 693 struct stat st; 694 size_t namesize; 695 size_t bufsize; 696 697 /* 698 ** Use localebuf.mon[0] to signal whether locale is already set up. 699 */ 700 if (localebuf.mon[0]) 701 return &localebuf; 702 name = setlocale(LC_TIME, NULL); 703 if (name == NULL || *name == '\0') 704 goto no_locale; 705 /* 706 ** If the locale name is the same as our cache, use the cache. 707 */ 708 lbuf = locale_buf; 709 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 710 p = lbuf; 711 for (ap = (const char **) &localebuf; 712 ap < (const char **) (&localebuf + 1); 713 ++ap) 714 *ap = p += strlen(p) + 1; 715 return &localebuf; 716 } 717 /* 718 ** Slurp the locale file into the cache. 719 */ 720 namesize = strlen(name) + 1; 721 if (sizeof filename < 722 ((sizeof locale_home) + namesize + (sizeof lc_time))) 723 goto no_locale; 724 oldsun = 0; 725 (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); 726 fd = open(filename, O_RDONLY); 727 if (fd < 0) { 728 /* 729 ** Old Sun systems have a different naming and data convention. 730 */ 731 oldsun = 1; 732 (void) sprintf(filename, "%s/%s/%s", locale_home, 733 lc_time, name); 734 fd = open(filename, O_RDONLY); 735 if (fd < 0) 736 goto no_locale; 737 } 738 if (fstat(fd, &st) != 0) 739 goto bad_locale; 740 if (st.st_size <= 0) 741 goto bad_locale; 742 bufsize = namesize + st.st_size; 743 locale_buf = NULL; 744 lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); 745 if (lbuf == NULL) 746 goto bad_locale; 747 (void) strcpy(lbuf, name); 748 p = lbuf + namesize; 749 plim = p + st.st_size; 750 if (read(fd, p, (size_t) st.st_size) != st.st_size) 751 goto bad_lbuf; 752 if (close(fd) != 0) 753 goto bad_lbuf; 754 /* 755 ** Parse the locale file into localebuf. 756 */ 757 if (plim[-1] != '\n') 758 goto bad_lbuf; 759 for (ap = (const char **) &localebuf; 760 ap < (const char **) (&localebuf + 1); 761 ++ap) { 762 if (p == plim) 763 goto bad_lbuf; 764 *ap = p; 765 while (*p != '\n') 766 ++p; 767 *p++ = '\0'; 768 } 769 if (oldsun) { 770 /* 771 ** SunOS 4 used an obsolescent format; see localdtconv(3). 772 ** c_fmt had the ``short format for dates and times together'' 773 ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); 774 ** date_fmt had the ``long format for dates'' 775 ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). 776 ** Discard the latter in favor of the former. 777 */ 778 localebuf.date_fmt = localebuf.c_fmt; 779 } 780 /* 781 ** Record the successful parse in the cache. 782 */ 783 locale_buf = lbuf; 784 785 return &localebuf; 786 787 bad_lbuf: 788 free(lbuf); 789 bad_locale: 790 (void) close(fd); 791 no_locale: 792 localebuf = C_time_locale; 793 locale_buf = NULL; 794 return &localebuf; 795 } 796 #endif /* defined LOCALE_HOME */ 797