1 /* $OpenBSD: wcsftime.c,v 1.2 2013/01/20 20:29:02 millert Exp $ */ 2 #include "private.h" 3 4 /* 5 ** Based on the UCB version with the ID appearing below. 6 ** This is ANSIish only when "multibyte character == plain character". 7 ** 8 ** Copyright (c) 1989, 1993 9 ** The Regents of the University of California. All rights reserved. 10 ** 11 ** Redistribution and use in source and binary forms, with or without 12 ** modification, are permitted provided that the following conditions 13 ** are met: 14 ** 1. Redistributions of source code must retain the above copyright 15 ** notice, this list of conditions and the following disclaimer. 16 ** 2. Redistributions in binary form must reproduce the above copyright 17 ** notice, this list of conditions and the following disclaimer in the 18 ** documentation and/or other materials provided with the distribution. 19 ** 3. Neither the name of the University nor the names of its contributors 20 ** may be used to endorse or promote products derived from this software 21 ** without specific prior written permission. 22 ** 23 ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 ** SUCH DAMAGE. 34 */ 35 36 #include "tzfile.h" 37 #include "fcntl.h" 38 #include <locale.h> 39 #include <wchar.h> 40 41 struct lc_time_T { 42 const wchar_t * mon[MONSPERYEAR]; 43 const wchar_t * month[MONSPERYEAR]; 44 const wchar_t * wday[DAYSPERWEEK]; 45 const wchar_t * weekday[DAYSPERWEEK]; 46 const wchar_t * X_fmt; 47 const wchar_t * x_fmt; 48 const wchar_t * c_fmt; 49 const wchar_t * am; 50 const wchar_t * pm; 51 const wchar_t * date_fmt; 52 }; 53 54 #define Locale (&C_time_locale) 55 56 static const struct lc_time_T C_time_locale = { 57 { 58 L"Jan", L"Feb", L"Mar", L"Apr", L"May", L"Jun", 59 L"Jul", L"Aug", L"Sep", L"Oct", L"Nov", L"Dec" 60 }, { 61 L"January", L"February", L"March", L"April", L"May", L"June", 62 L"July", L"August", L"September", L"October", L"November", 63 L"December" 64 }, { 65 L"Sun", L"Mon", L"Tue", L"Wed", 66 L"Thu", L"Fri", L"Sat" 67 }, { 68 L"Sunday", L"Monday", L"Tuesday", L"Wednesday", 69 L"Thursday", L"Friday", L"Saturday" 70 }, 71 72 /* X_fmt */ 73 L"%H:%M:%S", 74 75 /* 76 ** x_fmt 77 ** C99 requires this format. 78 ** Using just numbers (as here) makes Quakers happier; 79 ** it's also compatible with SVR4. 80 */ 81 L"%m/%d/%y", 82 83 /* 84 ** c_fmt 85 ** C99 requires this format. 86 ** Previously this code used "%D %X", but we now conform to C99. 87 ** Note that 88 ** "%a %b %d %H:%M:%S %Y" 89 ** is used by Solaris 2.3. 90 */ 91 L"%a %b %e %T %Y", 92 93 /* am */ 94 L"AM", 95 96 /* pm */ 97 L"PM", 98 99 /* date_fmt */ 100 L"%a %b %e %H:%M:%S %Z %Y" 101 }; 102 103 #define UNKNOWN L"?" 104 static wchar_t * _add(const wchar_t *, wchar_t *, const wchar_t *); 105 static wchar_t * _sadd(const char *, wchar_t *, const wchar_t *); 106 static wchar_t * _conv(int, const wchar_t *, wchar_t *, const wchar_t *); 107 static wchar_t * _fmt(const wchar_t *, const struct tm *, wchar_t *, const wchar_t *, 108 int *); 109 static wchar_t * _yconv(int, int, int, int, wchar_t *, const wchar_t *); 110 111 extern char * tzname[]; 112 113 #ifndef YEAR_2000_NAME 114 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" 115 #endif /* !defined YEAR_2000_NAME */ 116 117 #define IN_NONE 0 118 #define IN_SOME 1 119 #define IN_THIS 2 120 #define IN_ALL 3 121 122 size_t 123 wcsftime(wchar_t *__restrict s, size_t maxsize, 124 const wchar_t *__restrict format, const struct tm *__restrict t) 125 { 126 wchar_t *p; 127 int warn; 128 129 tzset(); 130 warn = IN_NONE; 131 p = _fmt(((format == NULL) ? L"%c" : format), t, s, s + maxsize, &warn); 132 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 133 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { 134 (void) fprintf(stderr, "\n"); 135 if (format == NULL) 136 (void) fprintf(stderr, "NULL strftime format "); 137 else (void) fwprintf(stderr, "strftime format \"%ls\" ", 138 format); 139 (void) fprintf(stderr, "yields only two digits of years in "); 140 if (warn == IN_SOME) 141 (void) fprintf(stderr, "some locales"); 142 else if (warn == IN_THIS) 143 (void) fprintf(stderr, "the current locale"); 144 else (void) fprintf(stderr, "all locales"); 145 (void) fprintf(stderr, "\n"); 146 } 147 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ 148 if (p == s + maxsize) { 149 if (maxsize > 0) 150 s[maxsize - 1] = '\0'; 151 return 0; 152 } 153 *p = L'\0'; 154 return p - s; 155 } 156 157 static wchar_t * 158 _fmt(const wchar_t *format, const struct tm *t, wchar_t *pt, 159 const wchar_t *ptlim, int *warnp) 160 { 161 for ( ; *format; ++format) { 162 if (*format != L'%') { 163 if (pt == ptlim) 164 break; 165 *pt++ = *format; 166 continue; 167 } 168 label: 169 switch (*++format) { 170 case '\0': 171 --format; 172 break; 173 case 'A': 174 pt = _add((t->tm_wday < 0 || 175 t->tm_wday >= DAYSPERWEEK) ? 176 UNKNOWN : Locale->weekday[t->tm_wday], 177 pt, ptlim); 178 continue; 179 case 'a': 180 pt = _add((t->tm_wday < 0 || 181 t->tm_wday >= DAYSPERWEEK) ? 182 UNKNOWN : Locale->wday[t->tm_wday], 183 pt, ptlim); 184 continue; 185 case 'B': 186 pt = _add((t->tm_mon < 0 || 187 t->tm_mon >= MONSPERYEAR) ? 188 UNKNOWN : Locale->month[t->tm_mon], 189 pt, ptlim); 190 continue; 191 case 'b': 192 case 'h': 193 pt = _add((t->tm_mon < 0 || 194 t->tm_mon >= MONSPERYEAR) ? 195 UNKNOWN : Locale->mon[t->tm_mon], 196 pt, ptlim); 197 continue; 198 case 'C': 199 /* 200 ** %C used to do a... 201 ** _fmt("%a %b %e %X %Y", t); 202 ** ...whereas now POSIX 1003.2 calls for 203 ** something completely different. 204 ** (ado, 1993-05-24) 205 */ 206 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 207 pt, ptlim); 208 continue; 209 case 'c': 210 { 211 int warn2 = IN_SOME; 212 213 pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2); 214 if (warn2 == IN_ALL) 215 warn2 = IN_THIS; 216 if (warn2 > *warnp) 217 *warnp = warn2; 218 } 219 continue; 220 case 'D': 221 pt = _fmt(L"%m/%d/%y", t, pt, ptlim, warnp); 222 continue; 223 case 'd': 224 pt = _conv(t->tm_mday, L"%02d", pt, ptlim); 225 continue; 226 case 'E': 227 case 'O': 228 /* 229 ** C99 locale modifiers. 230 ** The sequences 231 ** %Ec %EC %Ex %EX %Ey %EY 232 ** %Od %oe %OH %OI %Om %OM 233 ** %OS %Ou %OU %OV %Ow %OW %Oy 234 ** are supposed to provide alternate 235 ** representations. 236 */ 237 goto label; 238 case 'e': 239 pt = _conv(t->tm_mday, L"%2d", pt, ptlim); 240 continue; 241 case 'F': 242 pt = _fmt(L"%Y-%m-%d", t, pt, ptlim, warnp); 243 continue; 244 case 'H': 245 pt = _conv(t->tm_hour, L"%02d", pt, ptlim); 246 continue; 247 case 'I': 248 pt = _conv((t->tm_hour % 12) ? 249 (t->tm_hour % 12) : 12, 250 L"%02d", pt, ptlim); 251 continue; 252 case 'j': 253 pt = _conv(t->tm_yday + 1, L"%03d", pt, ptlim); 254 continue; 255 case 'k': 256 /* 257 ** This used to be... 258 ** _conv(t->tm_hour % 12 ? 259 ** t->tm_hour % 12 : 12, 2, ' '); 260 ** ...and has been changed to the below to 261 ** match SunOS 4.1.1 and Arnold Robbins' 262 ** strftime version 3.0. That is, "%k" and 263 ** "%l" have been swapped. 264 ** (ado, 1993-05-24) 265 */ 266 pt = _conv(t->tm_hour, L"%2d", pt, ptlim); 267 continue; 268 case 'l': 269 /* 270 ** This used to be... 271 ** _conv(t->tm_hour, 2, ' '); 272 ** ...and has been changed to the below to 273 ** match SunOS 4.1.1 and Arnold Robbin's 274 ** strftime version 3.0. That is, "%k" and 275 ** "%l" have been swapped. 276 ** (ado, 1993-05-24) 277 */ 278 pt = _conv((t->tm_hour % 12) ? 279 (t->tm_hour % 12) : 12, 280 L"%2d", pt, ptlim); 281 continue; 282 case 'M': 283 pt = _conv(t->tm_min, L"%02d", pt, ptlim); 284 continue; 285 case 'm': 286 pt = _conv(t->tm_mon + 1, L"%02d", pt, ptlim); 287 continue; 288 case 'n': 289 pt = _add(L"\n", pt, ptlim); 290 continue; 291 case 'p': 292 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 293 Locale->pm : 294 Locale->am, 295 pt, ptlim); 296 continue; 297 case 'R': 298 pt = _fmt(L"%H:%M", t, pt, ptlim, warnp); 299 continue; 300 case 'r': 301 pt = _fmt(L"%I:%M:%S %p", t, pt, ptlim, warnp); 302 continue; 303 case 'S': 304 pt = _conv(t->tm_sec, L"%02d", pt, ptlim); 305 continue; 306 case 's': 307 { 308 struct tm tm; 309 wchar_t buf[INT_STRLEN_MAXIMUM( 310 time_t) + 1]; 311 time_t mkt; 312 313 tm = *t; 314 mkt = mktime(&tm); 315 if (TYPE_SIGNED(time_t)) 316 (void) swprintf(buf, 317 sizeof buf/sizeof buf[0], 318 L"%ld", (long) mkt); 319 else 320 (void) swprintf(buf, 321 sizeof buf/sizeof buf[0], 322 L"%lu", (unsigned long) mkt); 323 pt = _add(buf, pt, ptlim); 324 } 325 continue; 326 case 'T': 327 pt = _fmt(L"%H:%M:%S", t, pt, ptlim, warnp); 328 continue; 329 case 't': 330 pt = _add(L"\t", pt, ptlim); 331 continue; 332 case 'U': 333 pt = _conv((t->tm_yday + DAYSPERWEEK - 334 t->tm_wday) / DAYSPERWEEK, 335 L"%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 L"%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 the ISO year 390 ** begin on? 391 */ 392 bot = ((yday + 11 - wday) % DAYSPERWEEK) - 3; 393 /* 394 ** What yday does the NEXT ISO year begin on? 395 */ 396 top = bot - (len % DAYSPERWEEK); 397 if (top < -3) 398 top += DAYSPERWEEK; 399 top += len; 400 if (yday >= top) { 401 ++base; 402 w = 1; 403 break; 404 } 405 if (yday >= bot) { 406 w = 1 + ((yday - bot) / DAYSPERWEEK); 407 break; 408 } 409 --base; 410 yday += isleap_sum(year, base) ? 411 DAYSPERLYEAR : 412 DAYSPERNYEAR; 413 } 414 if ((w == 52 && t->tm_mon == TM_JANUARY) || 415 (w == 1 && t->tm_mon == TM_DECEMBER)) 416 w = 53; 417 if (*format == 'V') 418 pt = _conv(w, L"%02d", pt, ptlim); 419 else if (*format == 'g') { 420 *warnp = IN_ALL; 421 pt = _yconv(year, base, 0, 1, pt, ptlim); 422 } else 423 pt = _yconv(year, base, 1, 1, pt, ptlim); 424 } 425 continue; 426 case 'v': 427 /* 428 ** From Arnold Robbins' strftime version 3.0: 429 ** "date as dd-bbb-YYYY" 430 ** (ado, 1993-05-24) 431 */ 432 pt = _fmt(L"%e-%b-%Y", t, pt, ptlim, warnp); 433 continue; 434 case 'W': 435 pt = _conv((t->tm_yday + DAYSPERWEEK - 436 (t->tm_wday ? 437 (t->tm_wday - 1) : 438 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 439 L"%02d", pt, ptlim); 440 continue; 441 case 'w': 442 pt = _conv(t->tm_wday, L"%d", pt, ptlim); 443 continue; 444 case 'X': 445 pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp); 446 continue; 447 case 'x': 448 { 449 int warn2 = IN_SOME; 450 451 pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2); 452 if (warn2 == IN_ALL) 453 warn2 = IN_THIS; 454 if (warn2 > *warnp) 455 *warnp = warn2; 456 } 457 continue; 458 case 'y': 459 *warnp = IN_ALL; 460 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, pt, ptlim); 461 continue; 462 case 'Y': 463 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, pt, ptlim); 464 continue; 465 case 'Z': 466 if (t->tm_zone != NULL) 467 pt = _sadd(t->TM_ZONE, pt, ptlim); 468 else 469 if (t->tm_isdst >= 0) 470 pt = _sadd(tzname[t->tm_isdst != 0], 471 pt, ptlim); 472 /* 473 ** C99 says that %Z must be replaced by the 474 ** empty string if the time zone is not 475 ** determinable. 476 */ 477 continue; 478 case 'z': 479 { 480 int diff; 481 wchar_t const * sign; 482 483 if (t->tm_isdst < 0) 484 continue; 485 diff = t->tm_gmtoff; 486 if (diff < 0) { 487 sign = L"-"; 488 diff = -diff; 489 } else 490 sign = L"+"; 491 pt = _add(sign, pt, ptlim); 492 diff /= SECSPERMIN; 493 diff = (diff / MINSPERHOUR) * 100 + 494 (diff % MINSPERHOUR); 495 pt = _conv(diff, L"%04d", pt, ptlim); 496 } 497 continue; 498 case '+': 499 pt = _fmt(Locale->date_fmt, t, pt, ptlim, warnp); 500 continue; 501 case '%': 502 /* 503 ** X311J/88-090 (4.12.3.5): if conversion wchar_t is 504 ** undefined, behavior is undefined. Print out the 505 ** character itself as printf(3) also does. 506 */ 507 default: 508 if (pt != ptlim) 509 *pt++ = *format; 510 break; 511 } 512 } 513 return pt; 514 } 515 516 static wchar_t * 517 _conv(int n, const wchar_t *format, wchar_t *pt, const wchar_t *ptlim) 518 { 519 wchar_t buf[INT_STRLEN_MAXIMUM(int) + 1]; 520 521 (void) swprintf(buf, sizeof buf/sizeof buf[0], format, n); 522 return _add(buf, pt, ptlim); 523 } 524 525 static wchar_t * 526 _add(const wchar_t *str, wchar_t *pt, const wchar_t *ptlim) 527 { 528 while (pt < ptlim && (*pt = *str++) != L'\0') 529 ++pt; 530 return pt; 531 } 532 533 static wchar_t * 534 _sadd(const char *str, wchar_t *pt, const wchar_t *ptlim) 535 { 536 while (pt < ptlim && (*pt = btowc(*str++)) != L'\0') 537 ++pt; 538 return pt; 539 } 540 /* 541 ** POSIX and the C Standard are unclear or inconsistent about 542 ** what %C and %y do if the year is negative or exceeds 9999. 543 ** Use the convention that %C concatenated with %y yields the 544 ** same output as %Y, and that %Y contains at least 4 bytes, 545 ** with more only if necessary. 546 */ 547 548 static wchar_t * 549 _yconv(int a, int b, int convert_top, int convert_yy, wchar_t *pt, 550 const wchar_t *ptlim) 551 { 552 register int lead; 553 register int trail; 554 555 #define DIVISOR 100 556 trail = a % DIVISOR + b % DIVISOR; 557 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 558 trail %= DIVISOR; 559 if (trail < 0 && lead > 0) { 560 trail += DIVISOR; 561 --lead; 562 } else if (lead < 0 && trail > 0) { 563 trail -= DIVISOR; 564 ++lead; 565 } 566 if (convert_top) { 567 if (lead == 0 && trail < 0) 568 pt = _add(L"-0", pt, ptlim); 569 else pt = _conv(lead, L"%02d", pt, ptlim); 570 } 571 if (convert_yy) 572 pt = _conv(((trail < 0) ? -trail : trail), L"%02d", pt, ptlim); 573 return pt; 574 } 575 576