1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 /* 19 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 20 * Use is subject to license terms. 21 */ 22 23 #include "lint.h" 24 #include "tzfile.h" 25 #include <fcntl.h> 26 #include <sys/stat.h> 27 #include <string.h> 28 #include <stdio.h> 29 #include "timelocal.h" 30 31 static char *_add(const char *, char *, const char *); 32 static char *_conv(int, const char *, char *, const char *); 33 static char *_fmt(const char *, const struct tm *, char *, const char * const); 34 static char *_yconv(int, int, int, int, char *, const char *); 35 36 extern char *tzname[]; 37 38 #define IN_NONE 0 39 #define IN_SOME 1 40 #define IN_THIS 2 41 #define IN_ALL 3 42 43 #define PAD_DEFAULT 0 44 #define PAD_LESS 1 45 #define PAD_SPACE 2 46 #define PAD_ZERO 3 47 48 static const char *fmt_padding[][4] = { 49 /* DEFAULT, LESS, SPACE, ZERO */ 50 #define PAD_FMT_MONTHDAY 0 51 #define PAD_FMT_HMS 0 52 #define PAD_FMT_CENTURY 0 53 #define PAD_FMT_SHORTYEAR 0 54 #define PAD_FMT_MONTH 0 55 #define PAD_FMT_WEEKOFYEAR 0 56 #define PAD_FMT_DAYOFMONTH 0 57 { "%02d", "%d", "%2d", "%02d" }, 58 #define PAD_FMT_SDAYOFMONTH 1 59 #define PAD_FMT_SHMS 1 60 { "%2d", "%d", "%2d", "%02d" }, 61 #define PAD_FMT_DAYOFYEAR 2 62 { "%03d", "%d", "%3d", "%03d" }, 63 #define PAD_FMT_YEAR 3 64 { "%04d", "%d", "%4d", "%04d" } 65 }; 66 67 68 size_t 69 strftime(char *_RESTRICT_KYWD s, size_t maxsize, 70 const char *_RESTRICT_KYWD format, const struct tm *_RESTRICT_KYWD t) 71 { 72 char *p; 73 74 tzset(); 75 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); 76 if (p == s + maxsize) 77 return (0); 78 *p = '\0'; 79 return (p - s); 80 } 81 82 static char * 83 _fmt(const char *format, const struct tm *t, char *pt, const char * const ptlim) 84 { 85 int Ealternative, Oalternative, PadIndex; 86 struct lc_time_T *tptr = __get_current_time_locale(); 87 88 #define PADDING(x) fmt_padding[x][PadIndex] 89 90 for (; *format; ++format) { 91 if (*format == '%') { 92 Ealternative = 0; 93 Oalternative = 0; 94 PadIndex = PAD_DEFAULT; 95 label: 96 switch (*++format) { 97 case '\0': 98 --format; 99 break; 100 case 'A': 101 pt = _add((t->tm_wday < 0 || 102 t->tm_wday >= DAYSPERWEEK) ? 103 "?" : tptr->weekday[t->tm_wday], 104 pt, ptlim); 105 continue; 106 case 'a': 107 pt = _add((t->tm_wday < 0 || 108 t->tm_wday >= DAYSPERWEEK) ? 109 "?" : tptr->wday[t->tm_wday], 110 pt, ptlim); 111 continue; 112 case 'B': 113 pt = _add((t->tm_mon < 0 || 114 t->tm_mon >= MONSPERYEAR) ? 115 "?" : (tptr->month)[t->tm_mon], 116 pt, ptlim); 117 continue; 118 case 'b': 119 case 'h': 120 pt = _add((t->tm_mon < 0 || 121 t->tm_mon >= MONSPERYEAR) ? 122 "?" : tptr->mon[t->tm_mon], 123 pt, ptlim); 124 continue; 125 case 'C': 126 /* 127 * %C used to do a... 128 * _fmt("%a %b %e %X %Y", t); 129 * ...whereas now POSIX 1003.2 calls for 130 * something completely different. 131 * (ado, 1993-05-24) 132 */ 133 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, 134 pt, ptlim); 135 continue; 136 case 'c': 137 pt = _fmt(tptr->c_fmt, t, pt, ptlim); 138 continue; 139 case 'D': 140 pt = _fmt("%m/%d/%y", t, pt, ptlim); 141 continue; 142 case 'd': 143 pt = _conv(t->tm_mday, 144 PADDING(PAD_FMT_DAYOFMONTH), pt, ptlim); 145 continue; 146 case 'E': 147 if (Ealternative || Oalternative) 148 break; 149 Ealternative++; 150 goto label; 151 case 'O': 152 /* 153 * C99 locale modifiers. 154 * The sequences 155 * %Ec %EC %Ex %EX %Ey %EY 156 * %Od %oe %OH %OI %Om %OM 157 * %OS %Ou %OU %OV %Ow %OW %Oy 158 * are supposed to provide alternate 159 * representations. 160 */ 161 if (Ealternative || Oalternative) 162 break; 163 Oalternative++; 164 goto label; 165 case 'e': 166 pt = _conv(t->tm_mday, 167 PADDING(PAD_FMT_SDAYOFMONTH), pt, ptlim); 168 continue; 169 case 'F': 170 pt = _fmt("%Y-%m-%d", t, pt, ptlim); 171 continue; 172 case 'H': 173 pt = _conv(t->tm_hour, PADDING(PAD_FMT_HMS), 174 pt, ptlim); 175 continue; 176 case 'I': 177 pt = _conv((t->tm_hour % 12) ? 178 (t->tm_hour % 12) : 12, 179 PADDING(PAD_FMT_HMS), pt, ptlim); 180 continue; 181 case 'j': 182 pt = _conv(t->tm_yday + 1, 183 PADDING(PAD_FMT_DAYOFYEAR), pt, ptlim); 184 continue; 185 case 'k': 186 /* 187 * This used to be... 188 * _conv(t->tm_hour % 12 ? 189 * t->tm_hour % 12 : 12, 2, ' '); 190 * ...and has been changed to the below to 191 * match SunOS 4.1.1 and Arnold Robbins' 192 * strftime version 3.0. That is, "%k" and 193 * "%l" have been swapped. 194 * (ado, 1993-05-24) 195 */ 196 pt = _conv(t->tm_hour, 197 PADDING(PAD_FMT_SHMS), pt, ptlim); 198 continue; 199 case 'l': 200 /* 201 * This used to be... 202 * _conv(t->tm_hour, 2, ' '); 203 * ...and has been changed to the below to 204 * match SunOS 4.1.1 and Arnold Robbin's 205 * strftime version 3.0. That is, "%k" and 206 * "%l" have been swapped. 207 * (ado, 1993-05-24) 208 */ 209 pt = _conv((t->tm_hour % 12) ? 210 (t->tm_hour % 12) : 12, 211 PADDING(PAD_FMT_SHMS), pt, ptlim); 212 continue; 213 case 'M': 214 pt = _conv(t->tm_min, PADDING(PAD_FMT_HMS), 215 pt, ptlim); 216 continue; 217 case 'm': 218 pt = _conv(t->tm_mon + 1, 219 PADDING(PAD_FMT_MONTH), 220 pt, ptlim); 221 continue; 222 case 'n': 223 pt = _add("\n", pt, ptlim); 224 continue; 225 case 'p': 226 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? 227 tptr->pm : tptr->am, pt, ptlim); 228 continue; 229 case 'R': 230 pt = _fmt("%H:%M", t, pt, ptlim); 231 continue; 232 case 'r': 233 pt = _fmt(tptr->ampm_fmt, t, pt, ptlim); 234 continue; 235 case 'S': 236 pt = _conv(t->tm_sec, PADDING(PAD_FMT_HMS), 237 pt, ptlim); 238 continue; 239 240 /* 241 * Note: 's' for seconds since epoch was removed. 242 * While FreeBSD and Linux appear to support this, 243 * Sun Solaris does not. Furthermore, the FreeBSD 244 * implementation was not correct for _LP64. 245 */ 246 247 case 'T': 248 pt = _fmt("%H:%M:%S", t, pt, ptlim); 249 continue; 250 case 't': 251 pt = _add("\t", pt, ptlim); 252 continue; 253 case 'U': 254 pt = _conv((t->tm_yday + DAYSPERWEEK - 255 t->tm_wday) / DAYSPERWEEK, 256 PADDING(PAD_FMT_WEEKOFYEAR), 257 pt, ptlim); 258 continue; 259 case 'u': 260 /* 261 * From Arnold Robbins' strftime version 3.0: 262 * "ISO 8601: Weekday as a decimal number 263 * [1 (Monday) - 7]" 264 * (ado, 1993-05-24) 265 */ 266 pt = _conv((t->tm_wday == 0) ? 267 DAYSPERWEEK : t->tm_wday, 268 "%d", pt, ptlim); 269 continue; 270 case 'V': /* ISO 8601 week number */ 271 case 'G': /* ISO 8601 year (four digits) */ 272 case 'g': /* ISO 8601 year (two digits) */ 273 /* 274 * From Arnold Robbins' strftime version 3.0: "the week number of the 275 * year (the first Monday as the first day of week 1) as a decimal number 276 * (01-53)." 277 * (ado, 1993-05-24) 278 * 279 * From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: 280 * "Week 01 of a year is per definition the first week which has the 281 * Thursday in this year, which is equivalent to the week which contains 282 * the fourth day of January. In other words, the first week of a new year 283 * is the week which has the majority of its days in the new year. Week 01 284 * might also contain days from the previous year and the week before week 285 * 01 of a year is the last week (52 or 53) of the previous year even if 286 * it contains days from the new year. A week starts with Monday (day 1) 287 * and ends with Sunday (day 7). For example, the first week of the year 288 * 1997 lasts from 1996-12-30 to 1997-01-05..." 289 * (ado, 1996-01-02) 290 */ 291 { 292 int year; 293 int base; 294 int yday; 295 int wday; 296 int w; 297 298 year = t->tm_year; 299 base = TM_YEAR_BASE; 300 yday = t->tm_yday; 301 wday = t->tm_wday; 302 for (;;) { 303 int len; 304 int bot; 305 int top; 306 307 len = isleap_sum(year, base) ? 308 DAYSPERLYEAR : DAYSPERNYEAR; 309 /* 310 * What yday (-3 ... 3) does 311 * the ISO year begin on? 312 */ 313 bot = ((yday + 11 - wday) % 314 DAYSPERWEEK) - 3; 315 /* 316 * What yday does the NEXT 317 * ISO year begin on? 318 */ 319 top = bot - (len % DAYSPERWEEK); 320 if (top < -3) 321 top += DAYSPERWEEK; 322 top += len; 323 if (yday >= top) { 324 ++base; 325 w = 1; 326 break; 327 } 328 if (yday >= bot) { 329 w = 1 + ((yday - bot) / 330 DAYSPERWEEK); 331 break; 332 } 333 --base; 334 yday += isleap_sum(year, base) ? 335 DAYSPERLYEAR : DAYSPERNYEAR; 336 } 337 #ifdef XPG4_1994_04_09 338 if ((w == 52 && t->tm_mon == TM_JANUARY) || 339 (w == 1 && t->tm_mon == TM_DECEMBER)) 340 w = 53; 341 #endif /* defined XPG4_1994_04_09 */ 342 if (*format == 'V') 343 pt = _conv(w, 344 PADDING(PAD_FMT_WEEKOFYEAR), 345 pt, ptlim); 346 else if (*format == 'g') { 347 pt = _yconv(year, base, 0, 1, 348 pt, ptlim); 349 } else 350 pt = _yconv(year, base, 1, 1, 351 pt, ptlim); 352 } 353 continue; 354 case 'v': 355 /* 356 * From Arnold Robbins' strftime version 3.0: 357 * "date as dd-bbb-YYYY" 358 * (ado, 1993-05-24) 359 */ 360 pt = _fmt("%e-%b-%Y", t, pt, ptlim); 361 continue; 362 case 'W': 363 pt = _conv((t->tm_yday + DAYSPERWEEK - 364 (t->tm_wday ? 365 (t->tm_wday - 1) : 366 (DAYSPERWEEK - 1))) / DAYSPERWEEK, 367 PADDING(PAD_FMT_WEEKOFYEAR), 368 pt, ptlim); 369 continue; 370 case 'w': 371 pt = _conv(t->tm_wday, "%d", pt, ptlim); 372 continue; 373 case 'X': 374 pt = _fmt(tptr->X_fmt, t, pt, ptlim); 375 continue; 376 case 'x': 377 pt = _fmt(tptr->x_fmt, t, pt, ptlim); 378 continue; 379 case 'y': 380 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, 381 pt, ptlim); 382 continue; 383 case 'Y': 384 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, 385 pt, ptlim); 386 continue; 387 case 'Z': 388 if (t->tm_isdst >= 0) 389 pt = _add(tzname[t->tm_isdst != 0], 390 pt, ptlim); 391 /* 392 * C99 says that %Z must be replaced by the 393 * empty string if the time zone is not 394 * determinable. 395 */ 396 continue; 397 case 'z': 398 { 399 int diff; 400 char const * sign; 401 402 if (t->tm_isdst < 0) 403 continue; 404 /* 405 * C99 says that the UTC offset must 406 * be computed by looking only at 407 * tm_isdst. This requirement is 408 * incorrect, since it means the code 409 * must rely on magic (in this case 410 * altzone and timezone), and the 411 * magic might not have the correct 412 * offset. Doing things correctly is 413 * tricky and requires disobeying C99; 414 * see GNU C strftime for details. 415 * For now, punt and conform to the 416 * standard, even though it's incorrect. 417 * 418 * C99 says that %z must be replaced by the 419 * empty string if the time zone is not 420 * determinable, so output nothing if the 421 * appropriate variables are not available. 422 */ 423 if (t->tm_isdst == 0) 424 diff = -timezone; 425 else 426 diff = -altzone; 427 if (diff < 0) { 428 sign = "-"; 429 diff = -diff; 430 } else 431 sign = "+"; 432 pt = _add(sign, pt, ptlim); 433 diff /= SECSPERMIN; 434 diff = (diff / MINSPERHOUR) * 100 + 435 (diff % MINSPERHOUR); 436 pt = _conv(diff, PADDING(PAD_FMT_YEAR), 437 pt, ptlim); 438 } 439 continue; 440 case '+': 441 pt = _fmt(tptr->date_fmt, t, pt, ptlim); 442 continue; 443 case '-': 444 if (PadIndex != PAD_DEFAULT) 445 break; 446 PadIndex = PAD_LESS; 447 goto label; 448 case '_': 449 if (PadIndex != PAD_DEFAULT) 450 break; 451 PadIndex = PAD_SPACE; 452 goto label; 453 case '0': 454 if (PadIndex != PAD_DEFAULT) 455 break; 456 PadIndex = PAD_ZERO; 457 goto label; 458 case '%': 459 /* 460 * X311J/88-090 (4.12.3.5): if conversion char is 461 * undefined, behavior is undefined. Print out the 462 * character itself as printf(3) also does. 463 */ 464 default: 465 break; 466 } 467 } 468 if (pt == ptlim) 469 break; 470 *pt++ = *format; 471 } 472 return (pt); 473 } 474 475 static char * 476 _conv(const int n, const char *format, char *const pt, 477 const char *const ptlim) 478 { 479 char buf[12]; 480 481 (void) sprintf(buf, format, n); 482 return (_add(buf, pt, ptlim)); 483 } 484 485 static char * 486 _add(const char *str, char *pt, const char *const ptlim) 487 { 488 while (pt < ptlim && (*pt = *str++) != '\0') 489 ++pt; 490 return (pt); 491 } 492 493 /* 494 * POSIX and the C Standard are unclear or inconsistent about 495 * what %C and %y do if the year is negative or exceeds 9999. 496 * Use the convention that %C concatenated with %y yields the 497 * same output as %Y, and that %Y contains at least 4 bytes, 498 * with more only if necessary. 499 */ 500 501 static char * 502 _yconv(const int a, const int b, const int convert_top, const int convert_yy, 503 char *pt, const char * const ptlim) 504 { 505 register int lead; 506 register int trail; 507 508 #define DIVISOR 100 509 trail = a % DIVISOR + b % DIVISOR; 510 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; 511 trail %= DIVISOR; 512 if (trail < 0 && lead > 0) { 513 trail += DIVISOR; 514 --lead; 515 } else if (lead < 0 && trail > 0) { 516 trail -= DIVISOR; 517 ++lead; 518 } 519 if (convert_top) { 520 if (lead == 0 && trail < 0) 521 pt = _add("-0", pt, ptlim); 522 else pt = _conv(lead, "%02d", pt, ptlim); 523 } 524 if (convert_yy) 525 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); 526 return (pt); 527 } 528