The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | #ifndef lint |
| 2 | #ifndef NOID |
| 3 | static char elsieid[] = "@(#)strftime.c 8.1"; |
| 4 | /* |
| 5 | ** Based on the UCB version with the ID appearing below. |
| 6 | ** This is ANSIish only when "multibyte character == plain character". |
| 7 | */ |
| 8 | #endif /* !defined NOID */ |
| 9 | #endif /* !defined lint */ |
| 10 | |
| 11 | #include <time.h> |
| 12 | #include <tzfile.h> |
| 13 | #include <limits.h> |
| 14 | #include <cutils/tztime.h> |
| 15 | |
| 16 | /* |
| 17 | ** Copyright (c) 1989 The Regents of the University of California. |
| 18 | ** All rights reserved. |
| 19 | ** |
| 20 | ** Redistribution and use in source and binary forms are permitted |
| 21 | ** provided that the above copyright notice and this paragraph are |
| 22 | ** duplicated in all such forms and that any documentation, |
| 23 | ** advertising materials, and other materials related to such |
| 24 | ** distribution and use acknowledge that the software was developed |
| 25 | ** by the University of California, Berkeley. The name of the |
| 26 | ** University may not be used to endorse or promote products derived |
| 27 | ** from this software without specific prior written permission. |
| 28 | ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 29 | ** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 30 | ** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 31 | */ |
| 32 | |
| 33 | #ifndef LIBC_SCCS |
| 34 | #ifndef lint |
| 35 | static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; |
| 36 | #endif /* !defined lint */ |
| 37 | #endif /* !defined LIBC_SCCS */ |
| 38 | |
| 39 | #include <ctype.h> |
| 40 | |
| 41 | #define P(x) x |
| 42 | |
| 43 | static char * _add P((const char *, char *, const char *, int)); |
| 44 | static char * _conv P((int, const char *, char *, const char *)); |
| 45 | static char * _fmt P((const char *, const struct tm *, char *, const char *, |
| 46 | int *, const struct strftime_locale *Locale)); |
| 47 | static char * _yconv P((int, int, int, int, char *, const char *, int)); |
| 48 | static char * getformat P((int, char *, char *, char *, char *)); |
| 49 | |
| 50 | extern char * tzname[]; |
| 51 | |
| 52 | |
| 53 | |
| 54 | |
| 55 | |
| 56 | /* from private.h */ |
| 57 | |
| 58 | #ifndef TYPE_BIT |
| 59 | #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) |
| 60 | #endif /* !defined TYPE_BIT */ |
| 61 | |
| 62 | #ifndef TYPE_SIGNED |
| 63 | #define TYPE_SIGNED(type) (((type) -1) < 0) |
| 64 | #endif /* !defined TYPE_SIGNED */ |
| 65 | |
| 66 | #ifndef INT_STRLEN_MAXIMUM |
| 67 | /* |
| 68 | * ** 302 / 1000 is log10(2.0) rounded up. |
| 69 | * ** Subtract one for the sign bit if the type is signed; |
| 70 | * ** add one for integer division truncation; |
| 71 | * ** add one more for a minus sign if the type is signed. |
| 72 | * */ |
| 73 | #define INT_STRLEN_MAXIMUM(type) \ |
| 74 | ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \ |
| 75 | 1 + TYPE_SIGNED(type)) |
| 76 | #endif /* !defined INT_STRLEN_MAXIMUM */ |
| 77 | |
| 78 | /* end of part from private.h */ |
| 79 | |
| 80 | |
| 81 | |
| 82 | |
| 83 | #ifndef YEAR_2000_NAME |
| 84 | #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" |
| 85 | #endif /* !defined YEAR_2000_NAME */ |
| 86 | |
| 87 | #define IN_NONE 0 |
| 88 | #define IN_SOME 1 |
| 89 | #define IN_THIS 2 |
| 90 | #define IN_ALL 3 |
| 91 | |
| 92 | #define FORCE_LOWER_CASE 0x100 |
| 93 | |
| 94 | size_t |
| 95 | strftime_tz(s, maxsize, format, t, Locale) |
| 96 | char * const s; |
| 97 | const size_t maxsize; |
| 98 | const char * const format; |
| 99 | const struct tm * const t; |
| 100 | const struct strftime_locale *Locale; |
| 101 | { |
| 102 | char * p; |
| 103 | int warn; |
| 104 | |
| 105 | warn = IN_NONE; |
| 106 | p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, Locale); |
| 107 | #if 0 |
| 108 | if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { |
| 109 | (void) fprintf(stderr, "\n"); |
| 110 | if (format == NULL) |
| 111 | (void) fprintf(stderr, "NULL strftime format "); |
| 112 | else (void) fprintf(stderr, "strftime format \"%s\" ", |
| 113 | format); |
| 114 | (void) fprintf(stderr, "yields only two digits of years in "); |
| 115 | if (warn == IN_SOME) |
| 116 | (void) fprintf(stderr, "some locales"); |
| 117 | else if (warn == IN_THIS) |
| 118 | (void) fprintf(stderr, "the current locale"); |
| 119 | else (void) fprintf(stderr, "all locales"); |
| 120 | (void) fprintf(stderr, "\n"); |
| 121 | } |
| 122 | #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ |
| 123 | if (p == s + maxsize) |
| 124 | return 0; |
| 125 | *p = '\0'; |
| 126 | return p - s; |
| 127 | } |
| 128 | |
| 129 | static char *getformat(int modifier, char *normal, char *underscore, |
| 130 | char *dash, char *zero) { |
| 131 | switch (modifier) { |
| 132 | case '_': |
| 133 | return underscore; |
| 134 | |
| 135 | case '-': |
| 136 | return dash; |
| 137 | |
| 138 | case '0': |
| 139 | return zero; |
| 140 | } |
| 141 | |
| 142 | return normal; |
| 143 | } |
| 144 | |
| 145 | static char * |
| 146 | _fmt(format, t, pt, ptlim, warnp, Locale) |
| 147 | const char * format; |
| 148 | const struct tm * const t; |
| 149 | char * pt; |
| 150 | const char * const ptlim; |
| 151 | int * warnp; |
| 152 | const struct strftime_locale *Locale; |
| 153 | { |
| 154 | for ( ; *format; ++format) { |
| 155 | if (*format == '%') { |
| 156 | int modifier = 0; |
| 157 | label: |
| 158 | switch (*++format) { |
| 159 | case '\0': |
| 160 | --format; |
| 161 | break; |
| 162 | case 'A': |
| 163 | pt = _add((t->tm_wday < 0 || |
| 164 | t->tm_wday >= DAYSPERWEEK) ? |
| 165 | "?" : Locale->weekday[t->tm_wday], |
| 166 | pt, ptlim, modifier); |
| 167 | continue; |
| 168 | case 'a': |
| 169 | pt = _add((t->tm_wday < 0 || |
| 170 | t->tm_wday >= DAYSPERWEEK) ? |
| 171 | "?" : Locale->wday[t->tm_wday], |
| 172 | pt, ptlim, modifier); |
| 173 | continue; |
| 174 | case 'B': |
Eric Fischer | 722a5c0 | 2009-05-12 16:26:16 -0700 | [diff] [blame^] | 175 | if (modifier == '-') { |
| 176 | pt = _add((t->tm_mon < 0 || |
| 177 | t->tm_mon >= MONSPERYEAR) ? |
| 178 | "?" : Locale->standalone_month[t->tm_mon], |
| 179 | pt, ptlim, modifier); |
| 180 | } else { |
| 181 | pt = _add((t->tm_mon < 0 || |
| 182 | t->tm_mon >= MONSPERYEAR) ? |
| 183 | "?" : Locale->month[t->tm_mon], |
| 184 | pt, ptlim, modifier); |
| 185 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 186 | continue; |
| 187 | case 'b': |
| 188 | case 'h': |
| 189 | pt = _add((t->tm_mon < 0 || |
| 190 | t->tm_mon >= MONSPERYEAR) ? |
| 191 | "?" : Locale->mon[t->tm_mon], |
| 192 | pt, ptlim, modifier); |
| 193 | continue; |
| 194 | case 'C': |
| 195 | /* |
| 196 | ** %C used to do a... |
| 197 | ** _fmt("%a %b %e %X %Y", t); |
| 198 | ** ...whereas now POSIX 1003.2 calls for |
| 199 | ** something completely different. |
| 200 | ** (ado, 1993-05-24) |
| 201 | */ |
| 202 | pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, |
| 203 | pt, ptlim, modifier); |
| 204 | continue; |
| 205 | case 'c': |
| 206 | { |
| 207 | int warn2 = IN_SOME; |
| 208 | |
| 209 | pt = _fmt(Locale->c_fmt, t, pt, ptlim, warnp, Locale); |
| 210 | if (warn2 == IN_ALL) |
| 211 | warn2 = IN_THIS; |
| 212 | if (warn2 > *warnp) |
| 213 | *warnp = warn2; |
| 214 | } |
| 215 | continue; |
| 216 | case 'D': |
| 217 | pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, Locale); |
| 218 | continue; |
| 219 | case 'd': |
| 220 | pt = _conv(t->tm_mday, |
| 221 | getformat(modifier, "%02d", |
| 222 | "%2d", "%d", "%02d"), |
| 223 | pt, ptlim); |
| 224 | continue; |
| 225 | case 'E': |
| 226 | case 'O': |
| 227 | /* |
| 228 | ** C99 locale modifiers. |
| 229 | ** The sequences |
| 230 | ** %Ec %EC %Ex %EX %Ey %EY |
| 231 | ** %Od %oe %OH %OI %Om %OM |
| 232 | ** %OS %Ou %OU %OV %Ow %OW %Oy |
| 233 | ** are supposed to provide alternate |
| 234 | ** representations. |
| 235 | */ |
| 236 | goto label; |
| 237 | case '_': |
| 238 | case '-': |
| 239 | case '0': |
| 240 | case '^': |
| 241 | case '#': |
| 242 | modifier = *format; |
| 243 | goto label; |
| 244 | case 'e': |
| 245 | pt = _conv(t->tm_mday, |
| 246 | getformat(modifier, "%2d", |
| 247 | "%2d", "%d", "%02d"), |
| 248 | pt, ptlim); |
| 249 | continue; |
| 250 | case 'F': |
| 251 | pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, Locale); |
| 252 | continue; |
| 253 | case 'H': |
| 254 | pt = _conv(t->tm_hour, |
| 255 | getformat(modifier, "%02d", |
| 256 | "%2d", "%d", "%02d"), |
| 257 | pt, ptlim); |
| 258 | continue; |
| 259 | case 'I': |
| 260 | pt = _conv((t->tm_hour % 12) ? |
| 261 | (t->tm_hour % 12) : 12, |
| 262 | getformat(modifier, "%02d", |
| 263 | "%2d", "%d", "%02d"), |
| 264 | pt, ptlim); |
| 265 | continue; |
| 266 | case 'j': |
| 267 | pt = _conv(t->tm_yday + 1, |
| 268 | getformat(modifier, "%03d", "%3d", "%d", "%03d"), |
| 269 | pt, ptlim); |
| 270 | continue; |
| 271 | case 'k': |
| 272 | /* |
| 273 | ** This used to be... |
| 274 | ** _conv(t->tm_hour % 12 ? |
| 275 | ** t->tm_hour % 12 : 12, 2, ' '); |
| 276 | ** ...and has been changed to the below to |
| 277 | ** match SunOS 4.1.1 and Arnold Robbins' |
| 278 | ** strftime version 3.0. That is, "%k" and |
| 279 | ** "%l" have been swapped. |
| 280 | ** (ado, 1993-05-24) |
| 281 | */ |
| 282 | pt = _conv(t->tm_hour, |
| 283 | getformat(modifier, "%2d", |
| 284 | "%2d", "%d", "%02d"), |
| 285 | pt, ptlim); |
| 286 | continue; |
| 287 | #ifdef KITCHEN_SINK |
| 288 | case 'K': |
| 289 | /* |
| 290 | ** After all this time, still unclaimed! |
| 291 | */ |
| 292 | pt = _add("kitchen sink", pt, ptlim, modifier); |
| 293 | continue; |
| 294 | #endif /* defined KITCHEN_SINK */ |
| 295 | case 'l': |
| 296 | /* |
| 297 | ** This used to be... |
| 298 | ** _conv(t->tm_hour, 2, ' '); |
| 299 | ** ...and has been changed to the below to |
| 300 | ** match SunOS 4.1.1 and Arnold Robbin's |
| 301 | ** strftime version 3.0. That is, "%k" and |
| 302 | ** "%l" have been swapped. |
| 303 | ** (ado, 1993-05-24) |
| 304 | */ |
| 305 | pt = _conv((t->tm_hour % 12) ? |
| 306 | (t->tm_hour % 12) : 12, |
| 307 | getformat(modifier, "%2d", |
| 308 | "%2d", "%d", "%02d"), |
| 309 | pt, ptlim); |
| 310 | continue; |
| 311 | case 'M': |
| 312 | pt = _conv(t->tm_min, |
| 313 | getformat(modifier, "%02d", |
| 314 | "%2d", "%d", "%02d"), |
| 315 | pt, ptlim); |
| 316 | continue; |
| 317 | case 'm': |
| 318 | pt = _conv(t->tm_mon + 1, |
| 319 | getformat(modifier, "%02d", |
| 320 | "%2d", "%d", "%02d"), |
| 321 | pt, ptlim); |
| 322 | continue; |
| 323 | case 'n': |
| 324 | pt = _add("\n", pt, ptlim, modifier); |
| 325 | continue; |
| 326 | case 'p': |
| 327 | pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? |
| 328 | Locale->pm : |
| 329 | Locale->am, |
| 330 | pt, ptlim, modifier); |
| 331 | continue; |
| 332 | case 'P': |
| 333 | pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? |
| 334 | Locale->pm : |
| 335 | Locale->am, |
| 336 | pt, ptlim, FORCE_LOWER_CASE); |
| 337 | continue; |
| 338 | case 'R': |
| 339 | pt = _fmt("%H:%M", t, pt, ptlim, warnp, Locale); |
| 340 | continue; |
| 341 | case 'r': |
| 342 | pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp, Locale); |
| 343 | continue; |
| 344 | case 'S': |
| 345 | pt = _conv(t->tm_sec, |
| 346 | getformat(modifier, "%02d", |
| 347 | "%2d", "%d", "%02d"), |
| 348 | pt, ptlim); |
| 349 | continue; |
| 350 | case 's': |
| 351 | { |
| 352 | struct tm tm; |
| 353 | char buf[INT_STRLEN_MAXIMUM( |
| 354 | time_t) + 1]; |
| 355 | time_t mkt; |
| 356 | |
| 357 | tm = *t; |
| 358 | mkt = mktime(&tm); |
| 359 | if (TYPE_SIGNED(time_t)) |
| 360 | (void) sprintf(buf, "%ld", |
| 361 | (long) mkt); |
| 362 | else (void) sprintf(buf, "%lu", |
| 363 | (unsigned long) mkt); |
| 364 | pt = _add(buf, pt, ptlim, modifier); |
| 365 | } |
| 366 | continue; |
| 367 | case 'T': |
| 368 | pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, Locale); |
| 369 | continue; |
| 370 | case 't': |
| 371 | pt = _add("\t", pt, ptlim, modifier); |
| 372 | continue; |
| 373 | case 'U': |
| 374 | pt = _conv((t->tm_yday + DAYSPERWEEK - |
| 375 | t->tm_wday) / DAYSPERWEEK, |
| 376 | getformat(modifier, "%02d", |
| 377 | "%2d", "%d", "%02d"), |
| 378 | pt, ptlim); |
| 379 | continue; |
| 380 | case 'u': |
| 381 | /* |
| 382 | ** From Arnold Robbins' strftime version 3.0: |
| 383 | ** "ISO 8601: Weekday as a decimal number |
| 384 | ** [1 (Monday) - 7]" |
| 385 | ** (ado, 1993-05-24) |
| 386 | */ |
| 387 | pt = _conv((t->tm_wday == 0) ? |
| 388 | DAYSPERWEEK : t->tm_wday, "%d", pt, ptlim); |
| 389 | continue; |
| 390 | case 'V': /* ISO 8601 week number */ |
| 391 | case 'G': /* ISO 8601 year (four digits) */ |
| 392 | case 'g': /* ISO 8601 year (two digits) */ |
| 393 | /* |
| 394 | ** From Arnold Robbins' strftime version 3.0: "the week number of the |
| 395 | ** year (the first Monday as the first day of week 1) as a decimal number |
| 396 | ** (01-53)." |
| 397 | ** (ado, 1993-05-24) |
| 398 | ** |
| 399 | ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: |
| 400 | ** "Week 01 of a year is per definition the first week which has the |
| 401 | ** Thursday in this year, which is equivalent to the week which contains |
| 402 | ** the fourth day of January. In other words, the first week of a new year |
| 403 | ** is the week which has the majority of its days in the new year. Week 01 |
| 404 | ** might also contain days from the previous year and the week before week |
| 405 | ** 01 of a year is the last week (52 or 53) of the previous year even if |
| 406 | ** it contains days from the new year. A week starts with Monday (day 1) |
| 407 | ** and ends with Sunday (day 7). For example, the first week of the year |
| 408 | ** 1997 lasts from 1996-12-30 to 1997-01-05..." |
| 409 | ** (ado, 1996-01-02) |
| 410 | */ |
| 411 | { |
| 412 | int year; |
| 413 | int base; |
| 414 | int yday; |
| 415 | int wday; |
| 416 | int w; |
| 417 | |
| 418 | year = t->tm_year; |
| 419 | base = TM_YEAR_BASE; |
| 420 | yday = t->tm_yday; |
| 421 | wday = t->tm_wday; |
| 422 | for ( ; ; ) { |
| 423 | int len; |
| 424 | int bot; |
| 425 | int top; |
| 426 | |
| 427 | len = isleap_sum(year, base) ? |
| 428 | DAYSPERLYEAR : |
| 429 | DAYSPERNYEAR; |
| 430 | /* |
| 431 | ** What yday (-3 ... 3) does |
| 432 | ** the ISO year begin on? |
| 433 | */ |
| 434 | bot = ((yday + 11 - wday) % |
| 435 | DAYSPERWEEK) - 3; |
| 436 | /* |
| 437 | ** What yday does the NEXT |
| 438 | ** ISO year begin on? |
| 439 | */ |
| 440 | top = bot - |
| 441 | (len % DAYSPERWEEK); |
| 442 | if (top < -3) |
| 443 | top += DAYSPERWEEK; |
| 444 | top += len; |
| 445 | if (yday >= top) { |
| 446 | ++base; |
| 447 | w = 1; |
| 448 | break; |
| 449 | } |
| 450 | if (yday >= bot) { |
| 451 | w = 1 + ((yday - bot) / |
| 452 | DAYSPERWEEK); |
| 453 | break; |
| 454 | } |
| 455 | --base; |
| 456 | yday += isleap_sum(year, base) ? |
| 457 | DAYSPERLYEAR : |
| 458 | DAYSPERNYEAR; |
| 459 | } |
| 460 | #ifdef XPG4_1994_04_09 |
| 461 | if ((w == 52 && |
| 462 | t->tm_mon == TM_JANUARY) || |
| 463 | (w == 1 && |
| 464 | t->tm_mon == TM_DECEMBER)) |
| 465 | w = 53; |
| 466 | #endif /* defined XPG4_1994_04_09 */ |
| 467 | if (*format == 'V') |
| 468 | pt = _conv(w, |
| 469 | getformat(modifier, |
| 470 | "%02d", |
| 471 | "%2d", |
| 472 | "%d", |
| 473 | "%02d"), |
| 474 | pt, ptlim); |
| 475 | else if (*format == 'g') { |
| 476 | *warnp = IN_ALL; |
| 477 | pt = _yconv(year, base, 0, 1, |
| 478 | pt, ptlim, modifier); |
| 479 | } else pt = _yconv(year, base, 1, 1, |
| 480 | pt, ptlim, modifier); |
| 481 | } |
| 482 | continue; |
| 483 | case 'v': |
| 484 | /* |
| 485 | ** From Arnold Robbins' strftime version 3.0: |
| 486 | ** "date as dd-bbb-YYYY" |
| 487 | ** (ado, 1993-05-24) |
| 488 | */ |
| 489 | pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, Locale); |
| 490 | continue; |
| 491 | case 'W': |
| 492 | pt = _conv((t->tm_yday + DAYSPERWEEK - |
| 493 | (t->tm_wday ? |
| 494 | (t->tm_wday - 1) : |
| 495 | (DAYSPERWEEK - 1))) / DAYSPERWEEK, |
| 496 | getformat(modifier, "%02d", |
| 497 | "%2d", "%d", "%02d"), |
| 498 | pt, ptlim); |
| 499 | continue; |
| 500 | case 'w': |
| 501 | pt = _conv(t->tm_wday, "%d", pt, ptlim); |
| 502 | continue; |
| 503 | case 'X': |
| 504 | pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp, Locale); |
| 505 | continue; |
| 506 | case 'x': |
| 507 | { |
| 508 | int warn2 = IN_SOME; |
| 509 | |
| 510 | pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2, Locale); |
| 511 | if (warn2 == IN_ALL) |
| 512 | warn2 = IN_THIS; |
| 513 | if (warn2 > *warnp) |
| 514 | *warnp = warn2; |
| 515 | } |
| 516 | continue; |
| 517 | case 'y': |
| 518 | *warnp = IN_ALL; |
| 519 | pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, |
| 520 | pt, ptlim, modifier); |
| 521 | continue; |
| 522 | case 'Y': |
| 523 | pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, |
| 524 | pt, ptlim, modifier); |
| 525 | continue; |
| 526 | case 'Z': |
| 527 | #ifdef TM_ZONE |
| 528 | if (t->TM_ZONE != NULL) |
| 529 | pt = _add(t->TM_ZONE, pt, ptlim, |
| 530 | modifier); |
| 531 | else |
| 532 | #endif /* defined TM_ZONE */ |
| 533 | if (t->tm_isdst >= 0) |
| 534 | pt = _add(tzname[t->tm_isdst != 0], |
| 535 | pt, ptlim, modifier); |
| 536 | /* |
| 537 | ** C99 says that %Z must be replaced by the |
| 538 | ** empty string if the time zone is not |
| 539 | ** determinable. |
| 540 | */ |
| 541 | continue; |
| 542 | case 'z': |
| 543 | { |
| 544 | int diff; |
| 545 | char const * sign; |
| 546 | |
| 547 | if (t->tm_isdst < 0) |
| 548 | continue; |
| 549 | #ifdef TM_GMTOFF |
| 550 | diff = t->TM_GMTOFF; |
| 551 | #else /* !defined TM_GMTOFF */ |
| 552 | /* |
| 553 | ** C99 says that the UTC offset must |
| 554 | ** be computed by looking only at |
| 555 | ** tm_isdst. This requirement is |
| 556 | ** incorrect, since it means the code |
| 557 | ** must rely on magic (in this case |
| 558 | ** altzone and timezone), and the |
| 559 | ** magic might not have the correct |
| 560 | ** offset. Doing things correctly is |
| 561 | ** tricky and requires disobeying C99; |
| 562 | ** see GNU C strftime for details. |
| 563 | ** For now, punt and conform to the |
| 564 | ** standard, even though it's incorrect. |
| 565 | ** |
| 566 | ** C99 says that %z must be replaced by the |
| 567 | ** empty string if the time zone is not |
| 568 | ** determinable, so output nothing if the |
| 569 | ** appropriate variables are not available. |
| 570 | */ |
| 571 | if (t->tm_isdst == 0) |
| 572 | #ifdef USG_COMPAT |
| 573 | diff = -timezone; |
| 574 | #else /* !defined USG_COMPAT */ |
| 575 | continue; |
| 576 | #endif /* !defined USG_COMPAT */ |
| 577 | else |
| 578 | #ifdef ALTZONE |
| 579 | diff = -altzone; |
| 580 | #else /* !defined ALTZONE */ |
| 581 | continue; |
| 582 | #endif /* !defined ALTZONE */ |
| 583 | #endif /* !defined TM_GMTOFF */ |
| 584 | if (diff < 0) { |
| 585 | sign = "-"; |
| 586 | diff = -diff; |
| 587 | } else sign = "+"; |
| 588 | pt = _add(sign, pt, ptlim, modifier); |
| 589 | diff /= SECSPERMIN; |
| 590 | diff = (diff / MINSPERHOUR) * 100 + |
| 591 | (diff % MINSPERHOUR); |
| 592 | pt = _conv(diff, |
| 593 | getformat(modifier, "%04d", |
| 594 | "%4d", "%d", "%04d"), |
| 595 | pt, ptlim); |
| 596 | } |
| 597 | continue; |
| 598 | case '+': |
| 599 | pt = _fmt(Locale->date_fmt, t, pt, ptlim, |
| 600 | warnp, Locale); |
| 601 | continue; |
| 602 | case '%': |
| 603 | /* |
| 604 | ** X311J/88-090 (4.12.3.5): if conversion char is |
| 605 | ** undefined, behavior is undefined. Print out the |
| 606 | ** character itself as printf(3) also does. |
| 607 | */ |
| 608 | default: |
| 609 | break; |
| 610 | } |
| 611 | } |
| 612 | if (pt == ptlim) |
| 613 | break; |
| 614 | *pt++ = *format; |
| 615 | } |
| 616 | return pt; |
| 617 | } |
| 618 | |
| 619 | static char * |
| 620 | _conv(n, format, pt, ptlim) |
| 621 | const int n; |
| 622 | const char * const format; |
| 623 | char * const pt; |
| 624 | const char * const ptlim; |
| 625 | { |
| 626 | char buf[INT_STRLEN_MAXIMUM(int) + 1]; |
| 627 | |
| 628 | (void) sprintf(buf, format, n); |
| 629 | return _add(buf, pt, ptlim, 0); |
| 630 | } |
| 631 | |
| 632 | static char * |
| 633 | _add(str, pt, ptlim, modifier) |
| 634 | const char * str; |
| 635 | char * pt; |
| 636 | const char * const ptlim; |
| 637 | int modifier; |
| 638 | { |
| 639 | int c; |
| 640 | |
| 641 | switch (modifier) { |
| 642 | case FORCE_LOWER_CASE: |
| 643 | while (pt < ptlim && (*pt = tolower(*str++)) != '\0') { |
| 644 | ++pt; |
| 645 | } |
| 646 | break; |
| 647 | |
| 648 | case '^': |
| 649 | while (pt < ptlim && (*pt = toupper(*str++)) != '\0') { |
| 650 | ++pt; |
| 651 | } |
| 652 | break; |
| 653 | |
| 654 | case '#': |
| 655 | while (pt < ptlim && (c = *str++) != '\0') { |
| 656 | if (isupper(c)) { |
| 657 | c = tolower(c); |
| 658 | } else if (islower(c)) { |
| 659 | c = toupper(c); |
| 660 | } |
| 661 | *pt = c; |
| 662 | ++pt; |
| 663 | } |
| 664 | |
| 665 | break; |
| 666 | |
| 667 | default: |
| 668 | while (pt < ptlim && (*pt = *str++) != '\0') { |
| 669 | ++pt; |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | return pt; |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | ** POSIX and the C Standard are unclear or inconsistent about |
| 678 | ** what %C and %y do if the year is negative or exceeds 9999. |
| 679 | ** Use the convention that %C concatenated with %y yields the |
| 680 | ** same output as %Y, and that %Y contains at least 4 bytes, |
| 681 | ** with more only if necessary. |
| 682 | */ |
| 683 | |
| 684 | static char * |
| 685 | _yconv(a, b, convert_top, convert_yy, pt, ptlim, modifier) |
| 686 | const int a; |
| 687 | const int b; |
| 688 | const int convert_top; |
| 689 | const int convert_yy; |
| 690 | char * pt; |
| 691 | const char * const ptlim; |
| 692 | int modifier; |
| 693 | { |
| 694 | register int lead; |
| 695 | register int trail; |
| 696 | |
| 697 | #define DIVISOR 100 |
| 698 | trail = a % DIVISOR + b % DIVISOR; |
| 699 | lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; |
| 700 | trail %= DIVISOR; |
| 701 | if (trail < 0 && lead > 0) { |
| 702 | trail += DIVISOR; |
| 703 | --lead; |
| 704 | } else if (lead < 0 && trail > 0) { |
| 705 | trail -= DIVISOR; |
| 706 | ++lead; |
| 707 | } |
| 708 | if (convert_top) { |
| 709 | if (lead == 0 && trail < 0) |
| 710 | pt = _add("-0", pt, ptlim, modifier); |
| 711 | else pt = _conv(lead, getformat(modifier, "%02d", |
| 712 | "%2d", "%d", "%02d"), |
| 713 | pt, ptlim); |
| 714 | } |
| 715 | if (convert_yy) |
| 716 | pt = _conv(((trail < 0) ? -trail : trail), |
| 717 | getformat(modifier, "%02d", "%2d", "%d", "%02d"), |
| 718 | pt, ptlim); |
| 719 | return pt; |
| 720 | } |
| 721 | |
| 722 | #ifdef LOCALE_HOME |
| 723 | static struct lc_time_T * |
| 724 | _loc P((void)) |
| 725 | { |
| 726 | static const char locale_home[] = LOCALE_HOME; |
| 727 | static const char lc_time[] = "LC_TIME"; |
| 728 | static char * locale_buf; |
| 729 | |
| 730 | int fd; |
| 731 | int oldsun; /* "...ain't got nothin' to do..." */ |
| 732 | char * lbuf; |
| 733 | char * name; |
| 734 | char * p; |
| 735 | const char ** ap; |
| 736 | const char * plim; |
| 737 | char filename[FILENAME_MAX]; |
| 738 | struct stat st; |
| 739 | size_t namesize; |
| 740 | size_t bufsize; |
| 741 | |
| 742 | /* |
| 743 | ** Use localebuf.mon[0] to signal whether locale is already set up. |
| 744 | */ |
| 745 | if (localebuf.mon[0]) |
| 746 | return &localebuf; |
| 747 | name = setlocale(LC_TIME, (char *) NULL); |
| 748 | if (name == NULL || *name == '\0') |
| 749 | goto no_locale; |
| 750 | /* |
| 751 | ** If the locale name is the same as our cache, use the cache. |
| 752 | */ |
| 753 | lbuf = locale_buf; |
| 754 | if (lbuf != NULL && strcmp(name, lbuf) == 0) { |
| 755 | p = lbuf; |
| 756 | for (ap = (const char **) &localebuf; |
| 757 | ap < (const char **) (&localebuf + 1); |
| 758 | ++ap) |
| 759 | *ap = p += strlen(p) + 1; |
| 760 | return &localebuf; |
| 761 | } |
| 762 | /* |
| 763 | ** Slurp the locale file into the cache. |
| 764 | */ |
| 765 | namesize = strlen(name) + 1; |
| 766 | if (sizeof filename < |
| 767 | ((sizeof locale_home) + namesize + (sizeof lc_time))) |
| 768 | goto no_locale; |
| 769 | oldsun = 0; |
| 770 | (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); |
| 771 | fd = open(filename, O_RDONLY); |
| 772 | if (fd < 0) { |
| 773 | /* |
| 774 | ** Old Sun systems have a different naming and data convention. |
| 775 | */ |
| 776 | oldsun = 1; |
| 777 | (void) sprintf(filename, "%s/%s/%s", locale_home, |
| 778 | lc_time, name); |
| 779 | fd = open(filename, O_RDONLY); |
| 780 | if (fd < 0) |
| 781 | goto no_locale; |
| 782 | } |
| 783 | if (fstat(fd, &st) != 0) |
| 784 | goto bad_locale; |
| 785 | if (st.st_size <= 0) |
| 786 | goto bad_locale; |
| 787 | bufsize = namesize + st.st_size; |
| 788 | locale_buf = NULL; |
| 789 | lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); |
| 790 | if (lbuf == NULL) |
| 791 | goto bad_locale; |
| 792 | (void) strcpy(lbuf, name); |
| 793 | p = lbuf + namesize; |
| 794 | plim = p + st.st_size; |
| 795 | if (read(fd, p, (size_t) st.st_size) != st.st_size) |
| 796 | goto bad_lbuf; |
| 797 | if (close(fd) != 0) |
| 798 | goto bad_lbuf; |
| 799 | /* |
| 800 | ** Parse the locale file into localebuf. |
| 801 | */ |
| 802 | if (plim[-1] != '\n') |
| 803 | goto bad_lbuf; |
| 804 | for (ap = (const char **) &localebuf; |
| 805 | ap < (const char **) (&localebuf + 1); |
| 806 | ++ap) { |
| 807 | if (p == plim) |
| 808 | goto bad_lbuf; |
| 809 | *ap = p; |
| 810 | while (*p != '\n') |
| 811 | ++p; |
| 812 | *p++ = '\0'; |
| 813 | } |
| 814 | if (oldsun) { |
| 815 | /* |
| 816 | ** SunOS 4 used an obsolescent format; see localdtconv(3). |
| 817 | ** c_fmt had the ``short format for dates and times together'' |
| 818 | ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); |
| 819 | ** date_fmt had the ``long format for dates'' |
| 820 | ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). |
| 821 | ** Discard the latter in favor of the former. |
| 822 | */ |
| 823 | localebuf.date_fmt = localebuf.c_fmt; |
| 824 | } |
| 825 | /* |
| 826 | ** Record the successful parse in the cache. |
| 827 | */ |
| 828 | locale_buf = lbuf; |
| 829 | |
| 830 | return &localebuf; |
| 831 | |
| 832 | bad_lbuf: |
| 833 | free(lbuf); |
| 834 | bad_locale: |
| 835 | (void) close(fd); |
| 836 | no_locale: |
| 837 | localebuf = C_time_locale; |
| 838 | locale_buf = NULL; |
| 839 | return &localebuf; |
| 840 | } |
| 841 | #endif /* defined LOCALE_HOME */ |