strftime.c revision 1.22.2.3
1 /* $NetBSD: strftime.c,v 1.22.2.3 2014/08/20 00:02:16 tls 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 1.22.2.3 2014/08/20 00:02:16 tls 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 #ifndef LIBC_SCCS 74 #ifndef lint 75 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 76 #endif /* !defined lint */ 77 #endif /* !defined LIBC_SCCS */ 78 79 #include "tzfile.h" 80 #include "fcntl.h" 81 #include "locale.h" 82 83 #ifdef __weak_alias 84 __weak_alias(strftime_l, _strftime_l) 85 __weak_alias(strftime_lz, _strftime_lz) 86 __weak_alias(strftime_z, _strftime_z) 87 #endif 88 89 #include "sys/localedef.h" 90 #define _TIME_LOCALE(loc) \ 91 ((_TimeLocale *)((loc)->part_impl[(size_t)LC_TIME])) 92 #define c_fmt d_t_fmt 93 94 static char * _add(const char *, char *, const char *); 95 static char * _conv(int, const char *, char *, const char *); 96 static char * _fmt(const timezone_t, const char *, const struct tm *, char *, 97 const char *, int *, locale_t); 98 static char * _yconv(int, int, int, int, char *, const char *); 99 100 extern char * tzname[]; 101 102 #ifndef YEAR_2000_NAME 103 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" 104 #endif /* !defined YEAR_2000_NAME */ 105 106 #define IN_NONE 0 107 #define IN_SOME 1 108 #define IN_THIS 2 109 #define IN_ALL 3 110 111 size_t 112 strftime_z(const timezone_t sp, char * __restrict s, size_t maxsize, 113 const char * __restrict format, const struct tm * __restrict t) 114 { 115 return strftime_lz(sp, s, maxsize, format, t, _current_locale()); 116 } 117 118 size_t 119 strftime_lz(const timezone_t sp, char *const s, const size_t maxsize, 120 const char *const format, const struct tm *const t, locale_t loc) 121 { 122 char * p; 123 int warn; 124 125 warn = IN_NONE; 126 p = _fmt(sp, ((format == NULL) ? "%c" : format), t, s, s + maxsize, 127 &warn, loc); 128 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 129 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { 130 (void) fprintf(stderr, "\n"); 131 if (format == NULL) 132 (void) fprintf(stderr, "NULL strftime format "); 133 else (void) fprintf(stderr, "strftime format \"%s\" ", 134 format); 135 (void) fprintf(stderr, "yields only two digits of years in "); 136 if (warn == IN_SOME) 137 (void) fprintf(stderr, "some locales"); 138 else if (warn == IN_THIS) 139 (void) fprintf(stderr, "the current locale"); 140 else (void) fprintf(stderr, "all locales"); 141 (void) fprintf(stderr, "\n"); 142 } 143 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ 144 if (p == s + maxsize) 145 return 0; 146 *p = '\0'; 147 return p - s; 148 } 149 150 static char * 151 _fmt(const timezone_t sp, const char *format, const struct tm *const t, 152 char *pt, const char *const ptlim, int *warnp, locale_t loc) 153 { 154 for ( ; *format; ++format) { 155 if (*format == '%') { 156 label: 157 switch (*++format) { 158 case '\0': 159 --format; 160 break; 161 case 'A': 162 pt = _add((t->tm_wday < 0 || 163 t->tm_wday >= DAYSPERWEEK) ? 164 "?" : _TIME_LOCALE(loc)->day[t->tm_wday], 165 pt, ptlim); 166 continue; 167 case 'a': 168 pt = _add((t->tm_wday < 0 || 169 t->tm_wday >= DAYSPERWEEK) ? 170 "?" : _TIME_LOCALE(loc)->abday[t->tm_wday], 171 pt, ptlim); 172 continue; 173 case 'B': 174 pt = _add((t->tm_mon < 0 || 175 t->tm_mon >= MONSPERYEAR) ? 176 "?" : _TIME_LOCALE(loc)->mon[t->tm_mon], 177 pt, ptlim); 178 continue; 179 case 'b': 180 case 'h': 181 pt = _add((t->tm_mon < 0 || 182 t->tm_mon >= MONSPERYEAR) ? 183 "?" : _TIME_LOCALE(loc)->abmon[t->tm_mon], 184 pt, ptlim); 185 continue; 186 case 'C': 187 /* 188 ** %C used to do a... 189 ** _fmt("%a %b %e %X %Y", t); 190 ** ...whereas now POSIX 1003.2 calls for 191 ** something completely different. 192 ** (ado, 1993-05-24) 193 */ 194 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 195 pt, ptlim); 196 continue; 197 case 'c': 198 { 199 int warn2 = IN_SOME; 200 201 pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt, 202 ptlim, &warn2, loc); 203 if (warn2 == IN_ALL) 204 warn2 = IN_THIS; 205 if (warn2 > *warnp) 206 *warnp = warn2; 207 } 208 continue; 209 case 'D': 210 pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp, 211 loc); 212 continue; 213 case 'd': 214 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 215 continue; 216 case 'E': 217 case 'O': 218 /* 219 ** C99 locale modifiers. 220 ** The sequences 221 ** %Ec %EC %Ex %EX %Ey %EY 222 ** %Od %oe %OH %OI %Om %OM 223 ** %OS %Ou %OU %OV %Ow %OW %Oy 224 ** are supposed to provide alternate 225 ** representations. 226 */ 227 goto label; 228 case 'e': 229 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 230 continue; 231 case 'F': 232 pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp, 233 loc); 234 continue; 235 case 'H': 236 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 237 continue; 238 case 'I': 239 pt = _conv((t->tm_hour % 12) ? 240 (t->tm_hour % 12) : 12, 241 "%02d", pt, ptlim); 242 continue; 243 case 'j': 244 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 245 continue; 246 case 'k': 247 /* 248 ** This used to be... 249 ** _conv(t->tm_hour % 12 ? 250 ** t->tm_hour % 12 : 12, 2, ' '); 251 ** ...and has been changed to the below to 252 ** match SunOS 4.1.1 and Arnold Robbins' 253 ** strftime version 3.0. That is, "%k" and 254 ** "%l" have been swapped. 255 ** (ado, 1993-05-24) 256 */ 257 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 258 continue; 259 #ifdef KITCHEN_SINK 260 case 'K': 261 /* 262 ** After all this time, still unclaimed! 263 */ 264 pt = _add("kitchen sink", pt, ptlim); 265 continue; 266 #endif /* defined KITCHEN_SINK */ 267 case 'l': 268 /* 269 ** This used to be... 270 ** _conv(t->tm_hour, 2, ' '); 271 ** ...and has been changed to the below to 272 ** match SunOS 4.1.1 and Arnold Robbin's 273 ** strftime version 3.0. That is, "%k" and 274 ** "%l" have been swapped. 275 ** (ado, 1993-05-24) 276 */ 277 pt = _conv((t->tm_hour % 12) ? 278 (t->tm_hour % 12) : 12, 279 "%2d", pt, ptlim); 280 continue; 281 case 'M': 282 pt = _conv(t->tm_min, "%02d", pt, ptlim); 283 continue; 284 case 'm': 285 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 286 continue; 287 case 'n': 288 pt = _add("\n", pt, ptlim); 289 continue; 290 case 'p': 291 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 292 _TIME_LOCALE(loc)->am_pm[1] : 293 _TIME_LOCALE(loc)->am_pm[0], 294 pt, ptlim); 295 continue; 296 case 'R': 297 pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp, 298 loc); 299 continue; 300 case 'r': 301 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt_ampm, t, 302 pt, ptlim, warnp, loc); 303 continue; 304 case 'S': 305 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 306 continue; 307 case 's': 308 { 309 struct tm tm; 310 char buf[INT_STRLEN_MAXIMUM( 311 time_t) + 1]; 312 time_t mkt; 313 314 tm = *t; 315 mkt = mktime(&tm); 316 /* CONSTCOND */ 317 if (TYPE_SIGNED(time_t)) 318 (void)snprintf(buf, sizeof(buf), 319 "%jd", (intmax_t) mkt); 320 else (void)snprintf(buf, sizeof(buf), 321 "%ju", (uintmax_t) mkt); 322 pt = _add(buf, pt, ptlim); 323 } 324 continue; 325 case 'T': 326 pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp, 327 loc); 328 continue; 329 case 't': 330 pt = _add("\t", pt, ptlim); 331 continue; 332 case 'U': 333 pt = _conv((t->tm_yday + DAYSPERWEEK - 334 t->tm_wday) / DAYSPERWEEK, 335 "%02d", pt, ptlim); 336 continue; 337 case 'u': 338 /* 339 ** From Arnold Robbins' strftime version 3.0: 340 ** "ISO 8601: Weekday as a decimal number 341 ** [1 (Monday) - 7]" 342 ** (ado, 1993-05-24) 343 */ 344 pt = _conv((t->tm_wday == 0) ? 345 DAYSPERWEEK : t->tm_wday, 346 "%d", pt, ptlim); 347 continue; 348 case 'V': /* ISO 8601 week number */ 349 case 'G': /* ISO 8601 year (four digits) */ 350 case 'g': /* ISO 8601 year (two digits) */ 351 /* 352 ** From Arnold Robbins' strftime version 3.0: "the week number of the 353 ** year (the first Monday as the first day of week 1) as a decimal number 354 ** (01-53)." 355 ** (ado, 1993-05-24) 356 ** 357 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: 358 ** "Week 01 of a year is per definition the first week which has the 359 ** Thursday in this year, which is equivalent to the week which contains 360 ** the fourth day of January. In other words, the first week of a new year 361 ** is the week which has the majority of its days in the new year. Week 01 362 ** might also contain days from the previous year and the week before week 363 ** 01 of a year is the last week (52 or 53) of the previous year even if 364 ** it contains days from the new year. A week starts with Monday (day 1) 365 ** and ends with Sunday (day 7). For example, the first week of the year 366 ** 1997 lasts from 1996-12-30 to 1997-01-05..." 367 ** (ado, 1996-01-02) 368 */ 369 { 370 int year; 371 int base; 372 int yday; 373 int wday; 374 int w; 375 376 year = t->tm_year; 377 base = TM_YEAR_BASE; 378 yday = t->tm_yday; 379 wday = t->tm_wday; 380 for ( ; ; ) { 381 int len; 382 int bot; 383 int top; 384 385 len = isleap_sum(year, base) ? 386 DAYSPERLYEAR : 387 DAYSPERNYEAR; 388 /* 389 ** What yday (-3 ... 3) does 390 ** the ISO year begin on? 391 */ 392 bot = ((yday + 11 - wday) % 393 DAYSPERWEEK) - 3; 394 /* 395 ** What yday does the NEXT 396 ** ISO year begin on? 397 */ 398 top = bot - 399 (len % DAYSPERWEEK); 400 if (top < -3) 401 top += DAYSPERWEEK; 402 top += len; 403 if (yday >= top) { 404 ++base; 405 w = 1; 406 break; 407 } 408 if (yday >= bot) { 409 w = 1 + ((yday - bot) / 410 DAYSPERWEEK); 411 break; 412 } 413 --base; 414 yday += isleap_sum(year, base) ? 415 DAYSPERLYEAR : 416 DAYSPERNYEAR; 417 } 418 #ifdef XPG4_1994_04_09 419 if ((w == 52 && 420 t->tm_mon == TM_JANUARY) || 421 (w == 1 && 422 t->tm_mon == TM_DECEMBER)) 423 w = 53; 424 #endif /* defined XPG4_1994_04_09 */ 425 if (*format == 'V') 426 pt = _conv(w, "%02d", 427 pt, ptlim); 428 else if (*format == 'g') { 429 *warnp = IN_ALL; 430 pt = _yconv(year, base, 0, 1, 431 pt, ptlim); 432 } else pt = _yconv(year, base, 1, 1, 433 pt, ptlim); 434 } 435 continue; 436 case 'v': 437 /* 438 ** From Arnold Robbins' strftime version 3.0: 439 ** "date as dd-bbb-YYYY" 440 ** (ado, 1993-05-24) 441 */ 442 pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp, 443 loc); 444 continue; 445 case 'W': 446 pt = _conv((t->tm_yday + DAYSPERWEEK - 447 (t->tm_wday ? 448 (t->tm_wday - 1) : 449 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 450 "%02d", pt, ptlim); 451 continue; 452 case 'w': 453 pt = _conv(t->tm_wday, "%d", pt, ptlim); 454 continue; 455 case 'X': 456 pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt, t, pt, 457 ptlim, warnp, loc); 458 continue; 459 case 'x': 460 { 461 int warn2 = IN_SOME; 462 463 pt = _fmt(sp, _TIME_LOCALE(loc)->d_fmt, t, pt, 464 ptlim, &warn2, loc); 465 if (warn2 == IN_ALL) 466 warn2 = IN_THIS; 467 if (warn2 > *warnp) 468 *warnp = warn2; 469 } 470 continue; 471 case 'y': 472 *warnp = IN_ALL; 473 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, 474 pt, ptlim); 475 continue; 476 case 'Y': 477 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, 478 pt, ptlim); 479 continue; 480 case 'Z': 481 #ifdef TM_ZONE 482 if (t->TM_ZONE != NULL) 483 pt = _add(t->TM_ZONE, pt, ptlim); 484 else 485 #endif /* defined TM_ZONE */ 486 if (t->tm_isdst >= 0) 487 pt = _add((sp ? 488 tzgetname(sp, t->tm_isdst) : 489 tzname[t->tm_isdst != 0]), 490 pt, ptlim); 491 /* 492 ** C99 says that %Z must be replaced by the 493 ** empty string if the time zone is not 494 ** determinable. 495 */ 496 continue; 497 case 'z': 498 { 499 long diff; 500 char const * sign; 501 502 if (t->tm_isdst < 0) 503 continue; 504 #ifdef TM_GMTOFF 505 diff = (int)t->TM_GMTOFF; 506 #else /* !defined TM_GMTOFF */ 507 /* 508 ** C99 says that the UT offset must 509 ** be computed by looking only at 510 ** tm_isdst. This requirement is 511 ** incorrect, since it means the code 512 ** must rely on magic (in this case 513 ** altzone and timezone), and the 514 ** magic might not have the correct 515 ** offset. Doing things correctly is 516 ** tricky and requires disobeying C99; 517 ** see GNU C strftime for details. 518 ** For now, punt and conform to the 519 ** standard, even though it's incorrect. 520 ** 521 ** C99 says that %z must be replaced by the 522 ** empty string if the time zone is not 523 ** determinable, so output nothing if the 524 ** appropriate variables are not available. 525 */ 526 #ifndef STD_INSPIRED 527 if (t->tm_isdst == 0) 528 #ifdef USG_COMPAT 529 diff = -timezone; 530 #else /* !defined USG_COMPAT */ 531 continue; 532 #endif /* !defined USG_COMPAT */ 533 else 534 #ifdef ALTZONE 535 diff = -altzone; 536 #else /* !defined ALTZONE */ 537 continue; 538 #endif /* !defined ALTZONE */ 539 #else /* defined STD_INSPIRED */ 540 { 541 struct tm tmp; 542 time_t lct, gct; 543 544 /* 545 ** Get calendar time from t 546 ** being treated as local. 547 */ 548 tmp = *t; /* mktime discards const */ 549 lct = mktime(&tmp); 550 551 if (lct == (time_t)-1) 552 continue; 553 554 /* 555 ** Get calendar time from t 556 ** being treated as GMT. 557 **/ 558 tmp = *t; /* mktime discards const */ 559 gct = timegm(&tmp); 560 561 if (gct == (time_t)-1) 562 continue; 563 564 /* LINTED difference will fit int */ 565 diff = (intmax_t)gct - (intmax_t)lct; 566 } 567 #endif /* defined STD_INSPIRED */ 568 #endif /* !defined TM_GMTOFF */ 569 if (diff < 0) { 570 sign = "-"; 571 diff = -diff; 572 } else sign = "+"; 573 pt = _add(sign, pt, ptlim); 574 diff /= SECSPERMIN; 575 diff = (diff / MINSPERHOUR) * 100 + 576 (diff % MINSPERHOUR); 577 _DIAGASSERT(__type_fit(int, diff)); 578 pt = _conv((int)diff, "%04d", pt, ptlim); 579 } 580 continue; 581 #if 0 582 case '+': 583 pt = _fmt(sp, _TIME_LOCALE(loc)->date_fmt, t, 584 pt, ptlim, warnp, loc); 585 continue; 586 #endif 587 case '%': 588 /* 589 ** X311J/88-090 (4.12.3.5): if conversion char is 590 ** undefined, behavior is undefined. Print out the 591 ** character itself as printf(3) also does. 592 */ 593 default: 594 break; 595 } 596 } 597 if (pt == ptlim) 598 break; 599 *pt++ = *format; 600 } 601 return pt; 602 } 603 604 size_t 605 strftime(char * const s, const size_t maxsize, 606 const char * const format, const struct tm * const t) 607 { 608 tzset(); 609 return strftime_z(NULL, s, maxsize, format, t); 610 } 611 612 size_t 613 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format, 614 const struct tm * __restrict t, locale_t loc) 615 { 616 tzset(); 617 return strftime_lz(NULL, s, maxsize, format, t, loc); 618 } 619 620 static char * 621 _conv(const int n, const char *const format, char *const pt, 622 const char *const ptlim) 623 { 624 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 625 626 (void) snprintf(buf, sizeof(buf), format, n); 627 return _add(buf, pt, ptlim); 628 } 629 630 static char * 631 _add(const char *str, char *pt, const char *const ptlim) 632 { 633 while (pt < ptlim && (*pt = *str++) != '\0') 634 ++pt; 635 return pt; 636 } 637 638 /* 639 ** POSIX and the C Standard are unclear or inconsistent about 640 ** what %C and %y do if the year is negative or exceeds 9999. 641 ** Use the convention that %C concatenated with %y yields the 642 ** same output as %Y, and that %Y contains at least 4 bytes, 643 ** with more only if necessary. 644 */ 645 646 static char * 647 _yconv(const int a, const int b, const int convert_top, const int convert_yy, 648 char *pt, const char *const ptlim) 649 { 650 int lead; 651 int trail; 652 653 #define DIVISOR 100 654 trail = a % DIVISOR + b % DIVISOR; 655 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 656 trail %= DIVISOR; 657 if (trail < 0 && lead > 0) { 658 trail += DIVISOR; 659 --lead; 660 } else if (lead < 0 && trail > 0) { 661 trail -= DIVISOR; 662 ++lead; 663 } 664 if (convert_top) { 665 if (lead == 0 && trail < 0) 666 pt = _add("-0", pt, ptlim); 667 else pt = _conv(lead, "%02d", pt, ptlim); 668 } 669 if (convert_yy) 670 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); 671 return pt; 672 } 673 674 #ifdef LOCALE_HOME 675 static struct lc_time_T * 676 _loc(void) 677 { 678 static const char locale_home[] = LOCALE_HOME; 679 static const char lc_time[] = "LC_TIME"; 680 static char * locale_buf; 681 682 int fd; 683 int oldsun; /* "...ain't got nothin' to do..." */ 684 char * lbuf; 685 char * name; 686 char * p; 687 const char ** ap; 688 const char * plim; 689 char filename[FILENAME_MAX]; 690 struct stat st; 691 size_t namesize; 692 size_t bufsize; 693 694 /* 695 ** Use localebuf.mon[0] to signal whether locale is already set up. 696 */ 697 if (localebuf.mon[0]) 698 return &localebuf; 699 name = setlocale(LC_TIME, NULL); 700 if (name == NULL || *name == '\0') 701 goto no_locale; 702 /* 703 ** If the locale name is the same as our cache, use the cache. 704 */ 705 lbuf = locale_buf; 706 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 707 p = lbuf; 708 for (ap = (const char **) &localebuf; 709 ap < (const char **) (&localebuf + 1); 710 ++ap) 711 *ap = p += strlen(p) + 1; 712 return &localebuf; 713 } 714 /* 715 ** Slurp the locale file into the cache. 716 */ 717 namesize = strlen(name) + 1; 718 if (sizeof filename < 719 ((sizeof locale_home) + namesize + (sizeof lc_time))) 720 goto no_locale; 721 oldsun = 0; 722 (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); 723 fd = open(filename, O_RDONLY); 724 if (fd < 0) { 725 /* 726 ** Old Sun systems have a different naming and data convention. 727 */ 728 oldsun = 1; 729 (void) sprintf(filename, "%s/%s/%s", locale_home, 730 lc_time, name); 731 fd = open(filename, O_RDONLY); 732 if (fd < 0) 733 goto no_locale; 734 } 735 if (fstat(fd, &st) != 0) 736 goto bad_locale; 737 if (st.st_size <= 0) 738 goto bad_locale; 739 bufsize = namesize + st.st_size; 740 locale_buf = NULL; 741 lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); 742 if (lbuf == NULL) 743 goto bad_locale; 744 (void) strcpy(lbuf, name); 745 p = lbuf + namesize; 746 plim = p + st.st_size; 747 if (read(fd, p, (size_t) st.st_size) != st.st_size) 748 goto bad_lbuf; 749 if (close(fd) != 0) 750 goto bad_lbuf; 751 /* 752 ** Parse the locale file into localebuf. 753 */ 754 if (plim[-1] != '\n') 755 goto bad_lbuf; 756 for (ap = (const char **) &localebuf; 757 ap < (const char **) (&localebuf + 1); 758 ++ap) { 759 if (p == plim) 760 goto bad_lbuf; 761 *ap = p; 762 while (*p != '\n') 763 ++p; 764 *p++ = '\0'; 765 } 766 if (oldsun) { 767 /* 768 ** SunOS 4 used an obsolescent format; see localdtconv(3). 769 ** c_fmt had the ``short format for dates and times together'' 770 ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); 771 ** date_fmt had the ``long format for dates'' 772 ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). 773 ** Discard the latter in favor of the former. 774 */ 775 localebuf.date_fmt = localebuf.c_fmt; 776 } 777 /* 778 ** Record the successful parse in the cache. 779 */ 780 locale_buf = lbuf; 781 782 return &localebuf; 783 784 bad_lbuf: 785 free(lbuf); 786 bad_locale: 787 (void) close(fd); 788 no_locale: 789 localebuf = C_time_locale; 790 locale_buf = NULL; 791 return &localebuf; 792 } 793 #endif /* defined LOCALE_HOME */ 794
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