1 /* $NetBSD: strftime.c,v 1.32 2014/09/18 13:58:20 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 1.32 2014/09/18 13:58:20 christos Exp $"); 10 #endif 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 15 #include <stddef.h> 16 #include <assert.h> 17 #include <locale.h> 18 #include "setlocale_local.h" 19 20 /* 21 ** Based on the UCB version with the copyright notice and sccsid 22 ** appearing below. 23 ** 24 ** This is ANSIish only when "multibyte character == plain character". 25 */ 26 27 #include "private.h" 28 29 /* 30 ** We don't use these extensions in strftime operation even when 31 ** supported by the local tzcode configuration. A strictly 32 ** conforming C application may leave them in undefined state. 33 */ 34 35 #ifdef _LIBC 36 #undef TM_ZONE 37 #undef TM_GMTOFF 38 #endif 39 40 /* 41 ** Copyright (c) 1989, 1993 42 ** The Regents of the University of California. All rights reserved. 43 ** 44 ** Redistribution and use in source and binary forms, with or without 45 ** modification, are permitted provided that the following conditions 46 ** are met: 47 ** 1. Redistributions of source code must retain the above copyright 48 ** notice, this list of conditions and the following disclaimer. 49 ** 2. Redistributions in binary form must reproduce the above copyright 50 ** notice, this list of conditions and the following disclaimer in the 51 ** documentation and/or other materials provided with the distribution. 52 ** 3. All advertising materials mentioning features or use of this software 53 ** must display the following acknowledgement: 54 ** This product includes software developed by the University of 55 ** California, Berkeley and its contributors. 56 ** 4. Neither the name of the University nor the names of its contributors 57 ** may be used to endorse or promote products derived from this software 58 ** without specific prior written permission. 59 ** 60 ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND 61 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 ** SUCH DAMAGE. 71 */ 72 73 #include "tzfile.h" 74 #include "fcntl.h" 75 #include "locale.h" 76 77 #ifdef __weak_alias 78 __weak_alias(strftime_l, _strftime_l) 79 __weak_alias(strftime_lz, _strftime_lz) 80 __weak_alias(strftime_z, _strftime_z) 81 #endif 82 83 #include "sys/localedef.h" 84 #define _TIME_LOCALE(loc) \ 85 ((_TimeLocale *)((loc)->part_impl[(size_t)LC_TIME])) 86 #define c_fmt d_t_fmt 87 88 static char * _add(const char *, char *, const char *); 89 static char * _conv(int, const char *, char *, const char *); 90 static char * _fmt(const timezone_t, const char *, const struct tm *, char *, 91 const char *, int *, locale_t); 92 static char * _yconv(int, int, int, int, char *, const char *); 93 94 extern char * tzname[]; 95 96 #ifndef YEAR_2000_NAME 97 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" 98 #endif /* !defined YEAR_2000_NAME */ 99 100 #define IN_NONE 0 101 #define IN_SOME 1 102 #define IN_THIS 2 103 #define IN_ALL 3 104 105 size_t 106 strftime_z(const timezone_t sp, char * __restrict s, size_t maxsize, 107 const char * __restrict format, const struct tm * __restrict t) 108 { 109 return strftime_lz(sp, s, maxsize, format, t, _current_locale()); 110 } 111 112 size_t 113 strftime_lz(const timezone_t sp, char *const s, const size_t maxsize, 114 const char *const format, const struct tm *const t, locale_t loc) 115 { 116 char * p; 117 int warn; 118 119 warn = IN_NONE; 120 p = _fmt(sp, ((format == NULL) ? "%c" : format), t, s, s + maxsize, 121 &warn, loc); 122 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 123 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { 124 (void) fprintf(stderr, "\n"); 125 if (format == NULL) 126 (void) fprintf(stderr, "NULL strftime format "); 127 else (void) fprintf(stderr, "strftime format \"%s\" ", 128 format); 129 (void) fprintf(stderr, "yields only two digits of years in "); 130 if (warn == IN_SOME) 131 (void) fprintf(stderr, "some locales"); 132 else if (warn == IN_THIS) 133 (void) fprintf(stderr, "the current locale"); 134 else (void) fprintf(stderr, "all locales"); 135 (void) fprintf(stderr, "\n"); 136 } 137 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ 138 if (p == s + maxsize) 139 return 0; 140 *p = '\0'; 141 return p - s; 142 } 143 144 static char * 145 _fmt(const timezone_t sp, const char *format, const struct tm *const t, 146 char *pt, const char *const ptlim, int *warnp, locale_t loc) 147 { 148 for ( ; *format; ++format) { 149 if (*format == '%') { 150 label: 151 switch (*++format) { 152 case '\0': 153 --format; 154 break; 155 case 'A': 156 pt = _add((t->tm_wday < 0 || 157 t->tm_wday >= DAYSPERWEEK) ? 158 "?" : _TIME_LOCALE(loc)->day[t->tm_wday], 159 pt, ptlim); 160 continue; 161 case 'a': 162 pt = _add((t->tm_wday < 0 || 163 t->tm_wday >= DAYSPERWEEK) ? 164 "?" : _TIME_LOCALE(loc)->abday[t->tm_wday], 165 pt, ptlim); 166 continue; 167 case 'B': 168 pt = _add((t->tm_mon < 0 || 169 t->tm_mon >= MONSPERYEAR) ? 170 "?" : _TIME_LOCALE(loc)->mon[t->tm_mon], 171 pt, ptlim); 172 continue; 173 case 'b': 174 case 'h': 175 pt = _add((t->tm_mon < 0 || 176 t->tm_mon >= MONSPERYEAR) ? 177 "?" : _TIME_LOCALE(loc)->abmon[t->tm_mon], 178 pt, ptlim); 179 continue; 180 case 'C': 181 /* 182 ** %C used to do a... 183 ** _fmt("%a %b %e %X %Y", t); 184 ** ...whereas now POSIX 1003.2 calls for 185 ** something completely different. 186 ** (ado, 1993-05-24) 187 */ 188 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 189 pt, ptlim); 190 continue; 191 case 'c': 192 { 193 int warn2 = IN_SOME; 194 195 pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt, 196 ptlim, &warn2, loc); 197 if (warn2 == IN_ALL) 198 warn2 = IN_THIS; 199 if (warn2 > *warnp) 200 *warnp = warn2; 201 } 202 continue; 203 case 'D': 204 pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp, 205 loc); 206 continue; 207 case 'd': 208 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 209 continue; 210 case 'E': 211 case 'O': 212 /* 213 ** C99 locale modifiers. 214 ** The sequences 215 ** %Ec %EC %Ex %EX %Ey %EY 216 ** %Od %oe %OH %OI %Om %OM 217 ** %OS %Ou %OU %OV %Ow %OW %Oy 218 ** are supposed to provide alternate 219 ** representations. 220 */ 221 goto label; 222 case 'e': 223 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 224 continue; 225 case 'F': 226 pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp, 227 loc); 228 continue; 229 case 'H': 230 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 231 continue; 232 case 'I': 233 pt = _conv((t->tm_hour % 12) ? 234 (t->tm_hour % 12) : 12, 235 "%02d", pt, ptlim); 236 continue; 237 case 'j': 238 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 239 continue; 240 case 'k': 241 /* 242 ** This used to be... 243 ** _conv(t->tm_hour % 12 ? 244 ** t->tm_hour % 12 : 12, 2, ' '); 245 ** ...and has been changed to the below to 246 ** match SunOS 4.1.1 and Arnold Robbins' 247 ** strftime version 3.0. That is, "%k" and 248 ** "%l" have been swapped. 249 ** (ado, 1993-05-24) 250 */ 251 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 252 continue; 253 #ifdef KITCHEN_SINK 254 case 'K': 255 /* 256 ** After all this time, still unclaimed! 257 */ 258 pt = _add("kitchen sink", pt, ptlim); 259 continue; 260 #endif /* defined KITCHEN_SINK */ 261 case 'l': 262 /* 263 ** This used to be... 264 ** _conv(t->tm_hour, 2, ' '); 265 ** ...and has been changed to the below to 266 ** match SunOS 4.1.1 and Arnold Robbin's 267 ** strftime version 3.0. That is, "%k" and 268 ** "%l" have been swapped. 269 ** (ado, 1993-05-24) 270 */ 271 pt = _conv((t->tm_hour % 12) ? 272 (t->tm_hour % 12) : 12, 273 "%2d", pt, ptlim); 274 continue; 275 case 'M': 276 pt = _conv(t->tm_min, "%02d", pt, ptlim); 277 continue; 278 case 'm': 279 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 280 continue; 281 case 'n': 282 pt = _add("\n", pt, ptlim); 283 continue; 284 case 'p': 285 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 286 _TIME_LOCALE(loc)->am_pm[1] : 287 _TIME_LOCALE(loc)->am_pm[0], 288 pt, ptlim); 289 continue; 290 case 'R': 291 pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp, 292 loc); 293 continue; 294 case 'r': 295 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt_ampm, t, 296 pt, ptlim, warnp, loc); 297 continue; 298 case 'S': 299 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 300 continue; 301 case 's': 302 { 303 struct tm tm; 304 char buf[INT_STRLEN_MAXIMUM( 305 time_t) + 1]; 306 time_t mkt; 307 308 tm = *t; 309 mkt = mktime(&tm); 310 /* CONSTCOND */ 311 if (TYPE_SIGNED(time_t)) 312 (void)snprintf(buf, sizeof(buf), 313 "%jd", (intmax_t) mkt); 314 else (void)snprintf(buf, sizeof(buf), 315 "%ju", (uintmax_t) mkt); 316 pt = _add(buf, pt, ptlim); 317 } 318 continue; 319 case 'T': 320 pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp, 321 loc); 322 continue; 323 case 't': 324 pt = _add("\t", pt, ptlim); 325 continue; 326 case 'U': 327 pt = _conv((t->tm_yday + DAYSPERWEEK - 328 t->tm_wday) / DAYSPERWEEK, 329 "%02d", pt, ptlim); 330 continue; 331 case 'u': 332 /* 333 ** From Arnold Robbins' strftime version 3.0: 334 ** "ISO 8601: Weekday as a decimal number 335 ** [1 (Monday) - 7]" 336 ** (ado, 1993-05-24) 337 */ 338 pt = _conv((t->tm_wday == 0) ? 339 DAYSPERWEEK : t->tm_wday, 340 "%d", pt, ptlim); 341 continue; 342 case 'V': /* ISO 8601 week number */ 343 case 'G': /* ISO 8601 year (four digits) */ 344 case 'g': /* ISO 8601 year (two digits) */ 345 /* 346 ** From Arnold Robbins' strftime version 3.0: "the week number of the 347 ** year (the first Monday as the first day of week 1) as a decimal number 348 ** (01-53)." 349 ** (ado, 1993-05-24) 350 ** 351 ** From <http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html> by Markus Kuhn: 352 ** "Week 01 of a year is per definition the first week which has the 353 ** Thursday in this year, which is equivalent to the week which contains 354 ** the fourth day of January. In other words, the first week of a new year 355 ** is the week which has the majority of its days in the new year. Week 01 356 ** might also contain days from the previous year and the week before week 357 ** 01 of a year is the last week (52 or 53) of the previous year even if 358 ** it contains days from the new year. A week starts with Monday (day 1) 359 ** and ends with Sunday (day 7). For example, the first week of the year 360 ** 1997 lasts from 1996-12-30 to 1997-01-05..." 361 ** (ado, 1996-01-02) 362 */ 363 { 364 int year; 365 int base; 366 int yday; 367 int wday; 368 int w; 369 370 year = t->tm_year; 371 base = TM_YEAR_BASE; 372 yday = t->tm_yday; 373 wday = t->tm_wday; 374 for ( ; ; ) { 375 int len; 376 int bot; 377 int top; 378 379 len = isleap_sum(year, base) ? 380 DAYSPERLYEAR : 381 DAYSPERNYEAR; 382 /* 383 ** What yday (-3 ... 3) does 384 ** the ISO year begin on? 385 */ 386 bot = ((yday + 11 - wday) % 387 DAYSPERWEEK) - 3; 388 /* 389 ** What yday does the NEXT 390 ** ISO year begin on? 391 */ 392 top = bot - 393 (len % DAYSPERWEEK); 394 if (top < -3) 395 top += DAYSPERWEEK; 396 top += len; 397 if (yday >= top) { 398 ++base; 399 w = 1; 400 break; 401 } 402 if (yday >= bot) { 403 w = 1 + ((yday - bot) / 404 DAYSPERWEEK); 405 break; 406 } 407 --base; 408 yday += isleap_sum(year, base) ? 409 DAYSPERLYEAR : 410 DAYSPERNYEAR; 411 } 412 #ifdef XPG4_1994_04_09 413 if ((w == 52 && 414 t->tm_mon == TM_JANUARY) || 415 (w == 1 && 416 t->tm_mon == TM_DECEMBER)) 417 w = 53; 418 #endif /* defined XPG4_1994_04_09 */ 419 if (*format == 'V') 420 pt = _conv(w, "%02d", 421 pt, ptlim); 422 else if (*format == 'g') { 423 *warnp = IN_ALL; 424 pt = _yconv(year, base, 0, 1, 425 pt, ptlim); 426 } else pt = _yconv(year, base, 1, 1, 427 pt, ptlim); 428 } 429 continue; 430 case 'v': 431 /* 432 ** From Arnold Robbins' strftime version 3.0: 433 ** "date as dd-bbb-YYYY" 434 ** (ado, 1993-05-24) 435 */ 436 pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp, 437 loc); 438 continue; 439 case 'W': 440 pt = _conv((t->tm_yday + DAYSPERWEEK - 441 (t->tm_wday ? 442 (t->tm_wday - 1) : 443 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 444 "%02d", pt, ptlim); 445 continue; 446 case 'w': 447 pt = _conv(t->tm_wday, "%d", pt, ptlim); 448 continue; 449 case 'X': 450 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt, t, pt, 451 ptlim, warnp, loc); 452 continue; 453 case 'x': 454 { 455 int warn2 = IN_SOME; 456 457 pt = _fmt(sp, _TIME_LOCALE(loc)->d_fmt, t, pt, 458 ptlim, &warn2, loc); 459 if (warn2 == IN_ALL) 460 warn2 = IN_THIS; 461 if (warn2 > *warnp) 462 *warnp = warn2; 463 } 464 continue; 465 case 'y': 466 *warnp = IN_ALL; 467 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, 468 pt, ptlim); 469 continue; 470 case 'Y': 471 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, 472 pt, ptlim); 473 continue; 474 case 'Z': 475 #ifdef TM_ZONE 476 if (t->TM_ZONE != NULL) 477 pt = _add(t->TM_ZONE, pt, ptlim); 478 else 479 #endif /* defined TM_ZONE */ 480 if (t->tm_isdst >= 0) 481 pt = _add((sp ? 482 tzgetname(sp, t->tm_isdst) : 483 tzname[t->tm_isdst != 0]), 484 pt, ptlim); 485 /* 486 ** C99 says that %Z must be replaced by the 487 ** empty string if the time zone is not 488 ** determinable. 489 */ 490 continue; 491 case 'z': 492 { 493 long diff; 494 char const * sign; 495 496 if (t->tm_isdst < 0) 497 continue; 498 #ifdef TM_GMTOFF 499 diff = (int)t->TM_GMTOFF; 500 #else /* !defined TM_GMTOFF */ 501 /* 502 ** C99 says that the UT offset must 503 ** be computed by looking only at 504 ** tm_isdst. This requirement is 505 ** incorrect, since it means the code 506 ** must rely on magic (in this case 507 ** altzone and timezone), and the 508 ** magic might not have the correct 509 ** offset. Doing things correctly is 510 ** tricky and requires disobeying C99; 511 ** see GNU C strftime for details. 512 ** For now, punt and conform to the 513 ** standard, even though it's incorrect. 514 ** 515 ** C99 says that %z must be replaced by the 516 ** empty string if the time zone is not 517 ** determinable, so output nothing if the 518 ** appropriate variables are not available. 519 */ 520 #ifndef STD_INSPIRED 521 if (t->tm_isdst == 0) 522 #ifdef USG_COMPAT 523 diff = -timezone; 524 #else /* !defined USG_COMPAT */ 525 continue; 526 #endif /* !defined USG_COMPAT */ 527 else 528 #ifdef ALTZONE 529 diff = -altzone; 530 #else /* !defined ALTZONE */ 531 continue; 532 #endif /* !defined ALTZONE */ 533 #else /* defined STD_INSPIRED */ 534 { 535 struct tm tmp; 536 time_t lct, gct; 537 538 /* 539 ** Get calendar time from t 540 ** being treated as local. 541 */ 542 tmp = *t; /* mktime discards const */ 543 lct = mktime(&tmp); 544 545 if (lct == (time_t)-1) 546 continue; 547 548 /* 549 ** Get calendar time from t 550 ** being treated as GMT. 551 **/ 552 tmp = *t; /* mktime discards const */ 553 gct = timegm(&tmp); 554 555 if (gct == (time_t)-1) 556 continue; 557 558 /* LINTED difference will fit int */ 559 diff = (intmax_t)gct - (intmax_t)lct; 560 } 561 #endif /* defined STD_INSPIRED */ 562 #endif /* !defined TM_GMTOFF */ 563 if (diff < 0) { 564 sign = "-"; 565 diff = -diff; 566 } else sign = "+"; 567 pt = _add(sign, pt, ptlim); 568 diff /= SECSPERMIN; 569 diff = (diff / MINSPERHOUR) * 100 + 570 (diff % MINSPERHOUR); 571 _DIAGASSERT(__type_fit(int, diff)); 572 pt = _conv((int)diff, "%04d", pt, ptlim); 573 } 574 continue; 575 #if 0 576 case '+': 577 pt = _fmt(sp, _TIME_LOCALE(loc)->date_fmt, t, 578 pt, ptlim, warnp, loc); 579 continue; 580 #endif 581 case '%': 582 /* 583 ** X311J/88-090 (4.12.3.5): if conversion char is 584 ** undefined, behavior is undefined. Print out the 585 ** character itself as printf(3) also does. 586 */ 587 default: 588 break; 589 } 590 } 591 if (pt == ptlim) 592 break; 593 *pt++ = *format; 594 } 595 return pt; 596 } 597 598 size_t 599 strftime(char * const s, const size_t maxsize, 600 const char * const format, const struct tm * const t) 601 { 602 tzset(); 603 return strftime_z(NULL, s, maxsize, format, t); 604 } 605 606 size_t 607 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format, 608 const struct tm * __restrict t, locale_t loc) 609 { 610 tzset(); 611 return strftime_lz(NULL, s, maxsize, format, t, loc); 612 } 613 614 static char * 615 _conv(const int n, const char *const format, char *const pt, 616 const char *const ptlim) 617 { 618 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 619 620 (void) snprintf(buf, sizeof(buf), format, n); 621 return _add(buf, pt, ptlim); 622 } 623 624 static char * 625 _add(const char *str, char *pt, const char *const ptlim) 626 { 627 while (pt < ptlim && (*pt = *str++) != '\0') 628 ++pt; 629 return pt; 630 } 631 632 /* 633 ** POSIX and the C Standard are unclear or inconsistent about 634 ** what %C and %y do if the year is negative or exceeds 9999. 635 ** Use the convention that %C concatenated with %y yields the 636 ** same output as %Y, and that %Y contains at least 4 bytes, 637 ** with more only if necessary. 638 */ 639 640 static char * 641 _yconv(const int a, const int b, const int convert_top, const int convert_yy, 642 char *pt, const char *const ptlim) 643 { 644 int lead; 645 int trail; 646 647 #define DIVISOR 100 648 trail = a % DIVISOR + b % DIVISOR; 649 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 650 trail %= DIVISOR; 651 if (trail < 0 && lead > 0) { 652 trail += DIVISOR; 653 --lead; 654 } else if (lead < 0 && trail > 0) { 655 trail -= DIVISOR; 656 ++lead; 657 } 658 if (convert_top) { 659 if (lead == 0 && trail < 0) 660 pt = _add("-0", pt, ptlim); 661 else pt = _conv(lead, "%02d", pt, ptlim); 662 } 663 if (convert_yy) 664 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); 665 return pt; 666 } 667 668 #ifdef LOCALE_HOME 669 static struct lc_time_T * 670 _loc(void) 671 { 672 static const char locale_home[] = LOCALE_HOME; 673 static const char lc_time[] = "LC_TIME"; 674 static char * locale_buf; 675 676 int fd; 677 int oldsun; /* "...ain't got nothin' to do..." */ 678 char * lbuf; 679 char * name; 680 char * p; 681 const char ** ap; 682 const char * plim; 683 char filename[FILENAME_MAX]; 684 struct stat st; 685 size_t namesize; 686 size_t bufsize; 687 688 /* 689 ** Use localebuf.mon[0] to signal whether locale is already set up. 690 */ 691 if (localebuf.mon[0]) 692 return &localebuf; 693 name = setlocale(LC_TIME, NULL); 694 if (name == NULL || *name == '\0') 695 goto no_locale; 696 /* 697 ** If the locale name is the same as our cache, use the cache. 698 */ 699 lbuf = locale_buf; 700 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 701 p = lbuf; 702 for (ap = (const char **) &localebuf; 703 ap < (const char **) (&localebuf + 1); 704 ++ap) 705 *ap = p += strlen(p) + 1; 706 return &localebuf; 707 } 708 /* 709 ** Slurp the locale file into the cache. 710 */ 711 namesize = strlen(name) + 1; 712 if (sizeof filename < 713 ((sizeof locale_home) + namesize + (sizeof lc_time))) 714 goto no_locale; 715 oldsun = 0; 716 (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); 717 fd = open(filename, O_RDONLY | O_CLOEXEC); 718 if (fd < 0) { 719 /* 720 ** Old Sun systems have a different naming and data convention. 721 */ 722 oldsun = 1; 723 (void) sprintf(filename, "%s/%s/%s", locale_home, 724 lc_time, name); 725 fd = open(filename, O_RDONLY | O_CLOEXEC); 726 if (fd < 0) 727 goto no_locale; 728 } 729 if (fstat(fd, &st) != 0) 730 goto bad_locale; 731 if (st.st_size <= 0) 732 goto bad_locale; 733 bufsize = namesize + st.st_size; 734 locale_buf = NULL; 735 lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); 736 if (lbuf == NULL) 737 goto bad_locale; 738 (void) strcpy(lbuf, name); 739 p = lbuf + namesize; 740 plim = p + st.st_size; 741 if (read(fd, p, (size_t) st.st_size) != st.st_size) 742 goto bad_lbuf; 743 if (close(fd) != 0) 744 goto bad_lbuf; 745 /* 746 ** Parse the locale file into localebuf. 747 */ 748 if (plim[-1] != '\n') 749 goto bad_lbuf; 750 for (ap = (const char **) &localebuf; 751 ap < (const char **) (&localebuf + 1); 752 ++ap) { 753 if (p == plim) 754 goto bad_lbuf; 755 *ap = p; 756 while (*p != '\n') 757 ++p; 758 *p++ = '\0'; 759 } 760 if (oldsun) { 761 /* 762 ** SunOS 4 used an obsolescent format; see localdtconv(3). 763 ** c_fmt had the "short format for dates and times together" 764 ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); 765 ** date_fmt had the "long format for dates" 766 ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). 767 ** Discard the latter in favor of the former. 768 */ 769 localebuf.date_fmt = localebuf.c_fmt; 770 } 771 /* 772 ** Record the successful parse in the cache. 773 */ 774 locale_buf = lbuf; 775 776 return &localebuf; 777 778 bad_lbuf: 779 free(lbuf); 780 bad_locale: 781 (void) close(fd); 782 no_locale: 783 localebuf = C_time_locale; 784 locale_buf = NULL; 785 return &localebuf; 786 } 787 #endif /* defined LOCALE_HOME */ 788