strftime.c revision 1.25
1 /* $NetBSD: strftime.c,v 1.25 2013/04/21 17:45:46 joerg 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 1.25 2013/04/21 17:45:46 joerg 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 if (loc == NULL) 125 loc = _C_locale; 126 127 warn = IN_NONE; 128 p = _fmt(sp, ((format == NULL) ? "%c" : format), t, s, s + maxsize, 129 &warn, loc); 130 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 131 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { 132 (void) fprintf(stderr, "\n"); 133 if (format == NULL) 134 (void) fprintf(stderr, "NULL strftime format "); 135 else (void) fprintf(stderr, "strftime format \"%s\" ", 136 format); 137 (void) fprintf(stderr, "yields only two digits of years in "); 138 if (warn == IN_SOME) 139 (void) fprintf(stderr, "some locales"); 140 else if (warn == IN_THIS) 141 (void) fprintf(stderr, "the current locale"); 142 else (void) fprintf(stderr, "all locales"); 143 (void) fprintf(stderr, "\n"); 144 } 145 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ 146 if (p == s + maxsize) 147 return 0; 148 *p = '\0'; 149 return p - s; 150 } 151 152 static char * 153 _fmt(const timezone_t sp, const char *format, const struct tm *const t, 154 char *pt, const char *const ptlim, int *warnp, locale_t loc) 155 { 156 for ( ; *format; ++format) { 157 if (*format == '%') { 158 label: 159 switch (*++format) { 160 case '\0': 161 --format; 162 break; 163 case 'A': 164 pt = _add((t->tm_wday < 0 || 165 t->tm_wday >= DAYSPERWEEK) ? 166 "?" : _TIME_LOCALE(loc)->day[t->tm_wday], 167 pt, ptlim); 168 continue; 169 case 'a': 170 pt = _add((t->tm_wday < 0 || 171 t->tm_wday >= DAYSPERWEEK) ? 172 "?" : _TIME_LOCALE(loc)->abday[t->tm_wday], 173 pt, ptlim); 174 continue; 175 case 'B': 176 pt = _add((t->tm_mon < 0 || 177 t->tm_mon >= MONSPERYEAR) ? 178 "?" : _TIME_LOCALE(loc)->mon[t->tm_mon], 179 pt, ptlim); 180 continue; 181 case 'b': 182 case 'h': 183 pt = _add((t->tm_mon < 0 || 184 t->tm_mon >= MONSPERYEAR) ? 185 "?" : _TIME_LOCALE(loc)->abmon[t->tm_mon], 186 pt, ptlim); 187 continue; 188 case 'C': 189 /* 190 ** %C used to do a... 191 ** _fmt("%a %b %e %X %Y", t); 192 ** ...whereas now POSIX 1003.2 calls for 193 ** something completely different. 194 ** (ado, 1993-05-24) 195 */ 196 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 197 pt, ptlim); 198 continue; 199 case 'c': 200 { 201 int warn2 = IN_SOME; 202 203 pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt, 204 ptlim, &warn2, loc); 205 if (warn2 == IN_ALL) 206 warn2 = IN_THIS; 207 if (warn2 > *warnp) 208 *warnp = warn2; 209 } 210 continue; 211 case 'D': 212 pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp, 213 loc); 214 continue; 215 case 'd': 216 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 217 continue; 218 case 'E': 219 case 'O': 220 /* 221 ** C99 locale modifiers. 222 ** The sequences 223 ** %Ec %EC %Ex %EX %Ey %EY 224 ** %Od %oe %OH %OI %Om %OM 225 ** %OS %Ou %OU %OV %Ow %OW %Oy 226 ** are supposed to provide alternate 227 ** representations. 228 */ 229 goto label; 230 case 'e': 231 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 232 continue; 233 case 'F': 234 pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp, 235 loc); 236 continue; 237 case 'H': 238 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 239 continue; 240 case 'I': 241 pt = _conv((t->tm_hour % 12) ? 242 (t->tm_hour % 12) : 12, 243 "%02d", pt, ptlim); 244 continue; 245 case 'j': 246 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 247 continue; 248 case 'k': 249 /* 250 ** This used to be... 251 ** _conv(t->tm_hour % 12 ? 252 ** t->tm_hour % 12 : 12, 2, ' '); 253 ** ...and has been changed to the below to 254 ** match SunOS 4.1.1 and Arnold Robbins' 255 ** strftime version 3.0. That is, "%k" and 256 ** "%l" have been swapped. 257 ** (ado, 1993-05-24) 258 */ 259 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 260 continue; 261 #ifdef KITCHEN_SINK 262 case 'K': 263 /* 264 ** After all this time, still unclaimed! 265 */ 266 pt = _add("kitchen sink", pt, ptlim); 267 continue; 268 #endif /* defined KITCHEN_SINK */ 269 case 'l': 270 /* 271 ** This used to be... 272 ** _conv(t->tm_hour, 2, ' '); 273 ** ...and has been changed to the below to 274 ** match SunOS 4.1.1 and Arnold Robbin's 275 ** strftime version 3.0. That is, "%k" and 276 ** "%l" have been swapped. 277 ** (ado, 1993-05-24) 278 */ 279 pt = _conv((t->tm_hour % 12) ? 280 (t->tm_hour % 12) : 12, 281 "%2d", pt, ptlim); 282 continue; 283 case 'M': 284 pt = _conv(t->tm_min, "%02d", pt, ptlim); 285 continue; 286 case 'm': 287 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 288 continue; 289 case 'n': 290 pt = _add("\n", pt, ptlim); 291 continue; 292 case 'p': 293 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 294 _TIME_LOCALE(loc)->am_pm[1] : 295 _TIME_LOCALE(loc)->am_pm[0], 296 pt, ptlim); 297 continue; 298 case 'R': 299 pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp, 300 loc); 301 continue; 302 case 'r': 303 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt_ampm, t, 304 pt, ptlim, warnp, loc); 305 continue; 306 case 'S': 307 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 308 continue; 309 case 's': 310 { 311 struct tm tm; 312 char buf[INT_STRLEN_MAXIMUM( 313 time_t) + 1]; 314 time_t mkt; 315 316 tm = *t; 317 mkt = mktime(&tm); 318 /* CONSTCOND */ 319 if (TYPE_SIGNED(time_t)) 320 (void) snprintf(buf, sizeof(buf), 321 "%lld", (long long) mkt); 322 else (void) snprintf(buf, sizeof(buf), 323 "%llu", (unsigned long long) 324 mkt); 325 pt = _add(buf, pt, ptlim); 326 } 327 continue; 328 case 'T': 329 pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp, 330 loc); 331 continue; 332 case 't': 333 pt = _add("\t", pt, ptlim); 334 continue; 335 case 'U': 336 pt = _conv((t->tm_yday + DAYSPERWEEK - 337 t->tm_wday) / DAYSPERWEEK, 338 "%02d", pt, ptlim); 339 continue; 340 case 'u': 341 /* 342 ** From Arnold Robbins' strftime version 3.0: 343 ** "ISO 8601: Weekday as a decimal number 344 ** [1 (Monday) - 7]" 345 ** (ado, 1993-05-24) 346 */ 347 pt = _conv((t->tm_wday == 0) ? 348 DAYSPERWEEK : t->tm_wday, 349 "%d", pt, ptlim); 350 continue; 351 case 'V': /* ISO 8601 week number */ 352 case 'G': /* ISO 8601 year (four digits) */ 353 case 'g': /* ISO 8601 year (two digits) */ 354 /* 355 ** From Arnold Robbins' strftime version 3.0: "the week number of the 356 ** year (the first Monday as the first day of week 1) as a decimal number 357 ** (01-53)." 358 ** (ado, 1993-05-24) 359 ** 360 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: 361 ** "Week 01 of a year is per definition the first week which has the 362 ** Thursday in this year, which is equivalent to the week which contains 363 ** the fourth day of January. In other words, the first week of a new year 364 ** is the week which has the majority of its days in the new year. Week 01 365 ** might also contain days from the previous year and the week before week 366 ** 01 of a year is the last week (52 or 53) of the previous year even if 367 ** it contains days from the new year. A week starts with Monday (day 1) 368 ** and ends with Sunday (day 7). For example, the first week of the year 369 ** 1997 lasts from 1996-12-30 to 1997-01-05..." 370 ** (ado, 1996-01-02) 371 */ 372 { 373 int year; 374 int base; 375 int yday; 376 int wday; 377 int w; 378 379 year = t->tm_year; 380 base = TM_YEAR_BASE; 381 yday = t->tm_yday; 382 wday = t->tm_wday; 383 for ( ; ; ) { 384 int len; 385 int bot; 386 int top; 387 388 len = isleap_sum(year, base) ? 389 DAYSPERLYEAR : 390 DAYSPERNYEAR; 391 /* 392 ** What yday (-3 ... 3) does 393 ** the ISO year begin on? 394 */ 395 bot = ((yday + 11 - wday) % 396 DAYSPERWEEK) - 3; 397 /* 398 ** What yday does the NEXT 399 ** ISO year begin on? 400 */ 401 top = bot - 402 (len % DAYSPERWEEK); 403 if (top < -3) 404 top += DAYSPERWEEK; 405 top += len; 406 if (yday >= top) { 407 ++base; 408 w = 1; 409 break; 410 } 411 if (yday >= bot) { 412 w = 1 + ((yday - bot) / 413 DAYSPERWEEK); 414 break; 415 } 416 --base; 417 yday += isleap_sum(year, base) ? 418 DAYSPERLYEAR : 419 DAYSPERNYEAR; 420 } 421 #ifdef XPG4_1994_04_09 422 if ((w == 52 && 423 t->tm_mon == TM_JANUARY) || 424 (w == 1 && 425 t->tm_mon == TM_DECEMBER)) 426 w = 53; 427 #endif /* defined XPG4_1994_04_09 */ 428 if (*format == 'V') 429 pt = _conv(w, "%02d", 430 pt, ptlim); 431 else if (*format == 'g') { 432 *warnp = IN_ALL; 433 pt = _yconv(year, base, 0, 1, 434 pt, ptlim); 435 } else pt = _yconv(year, base, 1, 1, 436 pt, ptlim); 437 } 438 continue; 439 case 'v': 440 /* 441 ** From Arnold Robbins' strftime version 3.0: 442 ** "date as dd-bbb-YYYY" 443 ** (ado, 1993-05-24) 444 */ 445 pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp, 446 loc); 447 continue; 448 case 'W': 449 pt = _conv((t->tm_yday + DAYSPERWEEK - 450 (t->tm_wday ? 451 (t->tm_wday - 1) : 452 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 453 "%02d", pt, ptlim); 454 continue; 455 case 'w': 456 pt = _conv(t->tm_wday, "%d", pt, ptlim); 457 continue; 458 case 'X': 459 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt, t, pt, 460 ptlim, warnp, loc); 461 continue; 462 case 'x': 463 { 464 int warn2 = IN_SOME; 465 466 pt = _fmt(sp, _TIME_LOCALE(loc)->d_fmt, t, pt, 467 ptlim, &warn2, loc); 468 if (warn2 == IN_ALL) 469 warn2 = IN_THIS; 470 if (warn2 > *warnp) 471 *warnp = warn2; 472 } 473 continue; 474 case 'y': 475 *warnp = IN_ALL; 476 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, 477 pt, ptlim); 478 continue; 479 case 'Y': 480 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, 481 pt, ptlim); 482 continue; 483 case 'Z': 484 #ifdef TM_ZONE 485 if (t->TM_ZONE != NULL) 486 pt = _add(t->TM_ZONE, pt, ptlim); 487 else 488 #endif /* defined TM_ZONE */ 489 if (t->tm_isdst >= 0) 490 pt = _add((sp ? 491 tzgetname(sp, t->tm_isdst) : 492 tzname[t->tm_isdst != 0]), 493 pt, ptlim); 494 /* 495 ** C99 says that %Z must be replaced by the 496 ** empty string if the time zone is not 497 ** determinable. 498 */ 499 continue; 500 case 'z': 501 { 502 int diff; 503 char const * sign; 504 505 if (t->tm_isdst < 0) 506 continue; 507 #ifdef TM_GMTOFF 508 diff = (int)t->TM_GMTOFF; 509 #else /* !defined TM_GMTOFF */ 510 /* 511 ** C99 says that the UTC offset must 512 ** be computed by looking only at 513 ** tm_isdst. This requirement is 514 ** incorrect, since it means the code 515 ** must rely on magic (in this case 516 ** altzone and timezone), and the 517 ** magic might not have the correct 518 ** offset. Doing things correctly is 519 ** tricky and requires disobeying C99; 520 ** see GNU C strftime for details. 521 ** For now, punt and conform to the 522 ** standard, even though it's incorrect. 523 ** 524 ** C99 says that %z must be replaced by the 525 ** empty string if the time zone is not 526 ** determinable, so output nothing if the 527 ** appropriate variables are not available. 528 */ 529 #ifndef STD_INSPIRED 530 if (t->tm_isdst == 0) 531 #ifdef USG_COMPAT 532 diff = -timezone; 533 #else /* !defined USG_COMPAT */ 534 continue; 535 #endif /* !defined USG_COMPAT */ 536 else 537 #ifdef ALTZONE 538 diff = -altzone; 539 #else /* !defined ALTZONE */ 540 continue; 541 #endif /* !defined ALTZONE */ 542 #else /* defined STD_INSPIRED */ 543 { 544 struct tm tmp; 545 time_t lct, gct; 546 547 /* 548 ** Get calendar time from t 549 ** being treated as local. 550 */ 551 tmp = *t; /* mktime discards const */ 552 lct = mktime(&tmp); 553 554 if (lct == (time_t)-1) 555 continue; 556 557 /* 558 ** Get calendar time from t 559 ** being treated as GMT. 560 **/ 561 tmp = *t; /* mktime discards const */ 562 gct = timegm(&tmp); 563 564 if (gct == (time_t)-1) 565 continue; 566 567 /* LINTED difference will fit int */ 568 diff = (intmax_t)gct - (intmax_t)lct; 569 } 570 #endif /* defined STD_INSPIRED */ 571 #endif /* !defined TM_GMTOFF */ 572 if (diff < 0) { 573 sign = "-"; 574 diff = -diff; 575 } else sign = "+"; 576 pt = _add(sign, pt, ptlim); 577 diff /= SECSPERMIN; 578 diff = (diff / MINSPERHOUR) * 100 + 579 (diff % MINSPERHOUR); 580 pt = _conv(diff, "%04d", pt, ptlim); 581 } 582 continue; 583 #if 0 584 case '+': 585 pt = _fmt(sp, _TIME_LOCALE(loc)->date_fmt, t, 586 pt, ptlim, warnp, loc); 587 continue; 588 #endif 589 case '%': 590 /* 591 ** X311J/88-090 (4.12.3.5): if conversion char is 592 ** undefined, behavior is undefined. Print out the 593 ** character itself as printf(3) also does. 594 */ 595 default: 596 break; 597 } 598 } 599 if (pt == ptlim) 600 break; 601 *pt++ = *format; 602 } 603 return pt; 604 } 605 606 size_t 607 strftime(char * const s, const size_t maxsize, 608 const char * const format, const struct tm * const t) 609 { 610 tzset(); 611 return strftime_z(NULL, s, maxsize, format, t); 612 } 613 614 size_t 615 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format, 616 const struct tm * __restrict t, locale_t loc) 617 { 618 tzset(); 619 return strftime_lz(NULL, s, maxsize, format, t, loc); 620 } 621 622 static char * 623 _conv(const int n, const char *const format, char *const pt, 624 const char *const ptlim) 625 { 626 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 627 628 (void) snprintf(buf, sizeof(buf), format, n); 629 return _add(buf, pt, ptlim); 630 } 631 632 static char * 633 _add(const char *str, char *pt, const char *const ptlim) 634 { 635 while (pt < ptlim && (*pt = *str++) != '\0') 636 ++pt; 637 return pt; 638 } 639 640 /* 641 ** POSIX and the C Standard are unclear or inconsistent about 642 ** what %C and %y do if the year is negative or exceeds 9999. 643 ** Use the convention that %C concatenated with %y yields the 644 ** same output as %Y, and that %Y contains at least 4 bytes, 645 ** with more only if necessary. 646 */ 647 648 static char * 649 _yconv(const int a, const int b, const int convert_top, const int convert_yy, 650 char *pt, const char *const ptlim) 651 { 652 register int lead; 653 register int trail; 654 655 #define DIVISOR 100 656 trail = a % DIVISOR + b % DIVISOR; 657 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 658 trail %= DIVISOR; 659 if (trail < 0 && lead > 0) { 660 trail += DIVISOR; 661 --lead; 662 } else if (lead < 0 && trail > 0) { 663 trail -= DIVISOR; 664 ++lead; 665 } 666 if (convert_top) { 667 if (lead == 0 && trail < 0) 668 pt = _add("-0", pt, ptlim); 669 else pt = _conv(lead, "%02d", pt, ptlim); 670 } 671 if (convert_yy) 672 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); 673 return pt; 674 } 675 676 #ifdef LOCALE_HOME 677 static struct lc_time_T * 678 _loc(void) 679 { 680 static const char locale_home[] = LOCALE_HOME; 681 static const char lc_time[] = "LC_TIME"; 682 static char * locale_buf; 683 684 int fd; 685 int oldsun; /* "...ain't got nothin' to do..." */ 686 char * lbuf; 687 char * name; 688 char * p; 689 const char ** ap; 690 const char * plim; 691 char filename[FILENAME_MAX]; 692 struct stat st; 693 size_t namesize; 694 size_t bufsize; 695 696 /* 697 ** Use localebuf.mon[0] to signal whether locale is already set up. 698 */ 699 if (localebuf.mon[0]) 700 return &localebuf; 701 name = setlocale(LC_TIME, NULL); 702 if (name == NULL || *name == '\0') 703 goto no_locale; 704 /* 705 ** If the locale name is the same as our cache, use the cache. 706 */ 707 lbuf = locale_buf; 708 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 709 p = lbuf; 710 for (ap = (const char **) &localebuf; 711 ap < (const char **) (&localebuf + 1); 712 ++ap) 713 *ap = p += strlen(p) + 1; 714 return &localebuf; 715 } 716 /* 717 ** Slurp the locale file into the cache. 718 */ 719 namesize = strlen(name) + 1; 720 if (sizeof filename < 721 ((sizeof locale_home) + namesize + (sizeof lc_time))) 722 goto no_locale; 723 oldsun = 0; 724 (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); 725 fd = open(filename, O_RDONLY); 726 if (fd < 0) { 727 /* 728 ** Old Sun systems have a different naming and data convention. 729 */ 730 oldsun = 1; 731 (void) sprintf(filename, "%s/%s/%s", locale_home, 732 lc_time, name); 733 fd = open(filename, O_RDONLY); 734 if (fd < 0) 735 goto no_locale; 736 } 737 if (fstat(fd, &st) != 0) 738 goto bad_locale; 739 if (st.st_size <= 0) 740 goto bad_locale; 741 bufsize = namesize + st.st_size; 742 locale_buf = NULL; 743 lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); 744 if (lbuf == NULL) 745 goto bad_locale; 746 (void) strcpy(lbuf, name); 747 p = lbuf + namesize; 748 plim = p + st.st_size; 749 if (read(fd, p, (size_t) st.st_size) != st.st_size) 750 goto bad_lbuf; 751 if (close(fd) != 0) 752 goto bad_lbuf; 753 /* 754 ** Parse the locale file into localebuf. 755 */ 756 if (plim[-1] != '\n') 757 goto bad_lbuf; 758 for (ap = (const char **) &localebuf; 759 ap < (const char **) (&localebuf + 1); 760 ++ap) { 761 if (p == plim) 762 goto bad_lbuf; 763 *ap = p; 764 while (*p != '\n') 765 ++p; 766 *p++ = '\0'; 767 } 768 if (oldsun) { 769 /* 770 ** SunOS 4 used an obsolescent format; see localdtconv(3). 771 ** c_fmt had the ``short format for dates and times together'' 772 ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); 773 ** date_fmt had the ``long format for dates'' 774 ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). 775 ** Discard the latter in favor of the former. 776 */ 777 localebuf.date_fmt = localebuf.c_fmt; 778 } 779 /* 780 ** Record the successful parse in the cache. 781 */ 782 locale_buf = lbuf; 783 784 return &localebuf; 785 786 bad_lbuf: 787 free(lbuf); 788 bad_locale: 789 (void) close(fd); 790 no_locale: 791 localebuf = C_time_locale; 792 locale_buf = NULL; 793 return &localebuf; 794 } 795 #endif /* defined LOCALE_HOME */ 796
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