1#ifndef lint 2#ifndef NOID
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3static char elsieid[] = "@(#)localtime.c 7.19";
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3static char elsieid[] = "@(#)localtime.c 7.44"; |
4#endif /* !defined NOID */ 5#endif /* !defined lint */ 6 7/* 8** Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu). 9** POSIX-style TZ environment variable handling from Guy Harris 10** (guy@auspex.com). 11*/ 12 13/*LINTLIBRARY*/ 14 15#include "private.h" 16#include "tzfile.h" 17#include "fcntl.h" 18
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19#define ACCESS_MODE O_RDONLY
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19/* 20** SunOS 4.1.1 headers lack O_BINARY. 21*/ |
22 23#ifdef O_BINARY 24#define OPEN_MODE (O_RDONLY | O_BINARY) 25#endif /* defined O_BINARY */ 26#ifndef O_BINARY 27#define OPEN_MODE O_RDONLY 28#endif /* !defined O_BINARY */ 29 30#ifndef WILDABBR 31/* 32** Someone might make incorrect use of a time zone abbreviation: 33** 1. They might reference tzname[0] before calling tzset (explicitly
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32** or implicitly).
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34** or implicitly). |
35** 2. They might reference tzname[1] before calling tzset (explicitly
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34** or implicitly).
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36** or implicitly). |
37** 3. They might reference tzname[1] after setting to a time zone 38** in which Daylight Saving Time is never observed. 39** 4. They might reference tzname[0] after setting to a time zone 40** in which Standard Time is never observed. 41** 5. They might reference tm.TM_ZONE after calling offtime. 42** What's best to do in the above cases is open to debate; 43** for now, we just set things up so that in any of the five cases 44** WILDABBR is used. Another possibility: initialize tzname[0] to the 45** string "tzname[0] used before set", and similarly for the other cases. 46** And another: initialize tzname[0] to "ERA", with an explanation in the 47** manual page of what this "time zone abbreviation" means (doing this so 48** that tzname[0] has the "normal" length of three characters). 49*/ 50#define WILDABBR " " 51#endif /* !defined WILDABBR */ 52
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51static const char GMT[] = "GMT";
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53static char wildabbr[] = "WILDABBR"; |
54
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55static const char gmt[] = "GMT"; 56 |
57struct ttinfo { /* time type information */ 58 long tt_gmtoff; /* GMT offset in seconds */ 59 int tt_isdst; /* used to set tm_isdst */ 60 int tt_abbrind; /* abbreviation list index */ 61 int tt_ttisstd; /* TRUE if transition is std time */
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62 int tt_ttisgmt; /* TRUE if transition is GMT */ |
63}; 64 65struct lsinfo { /* leap second information */ 66 time_t ls_trans; /* transition time */ 67 long ls_corr; /* correction to apply */ 68}; 69 70#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 71 72#ifdef TZNAME_MAX 73#define MY_TZNAME_MAX TZNAME_MAX 74#endif /* defined TZNAME_MAX */ 75#ifndef TZNAME_MAX 76#define MY_TZNAME_MAX 255 77#endif /* !defined TZNAME_MAX */ 78 79struct state { 80 int leapcnt; 81 int timecnt; 82 int typecnt; 83 int charcnt; 84 time_t ats[TZ_MAX_TIMES]; 85 unsigned char types[TZ_MAX_TIMES]; 86 struct ttinfo ttis[TZ_MAX_TYPES];
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82 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof GMT),
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87 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), |
88 (2 * (MY_TZNAME_MAX + 1)))]; 89 struct lsinfo lsis[TZ_MAX_LEAPS]; 90}; 91 92struct rule { 93 int r_type; /* type of rule--see below */ 94 int r_day; /* day number of rule */ 95 int r_week; /* week number of rule */ 96 int r_mon; /* month number of rule */ 97 long r_time; /* transition time of rule */ 98}; 99 100#define JULIAN_DAY 0 /* Jn - Julian day */ 101#define DAY_OF_YEAR 1 /* n - day of year */ 102#define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 103 104/* 105** Prototypes for static functions. 106*/ 107 108static long detzcode P((const char * codep)); 109static const char * getzname P((const char * strp)); 110static const char * getnum P((const char * strp, int * nump, int min, 111 int max)); 112static const char * getsecs P((const char * strp, long * secsp)); 113static const char * getoffset P((const char * strp, long * offsetp)); 114static const char * getrule P((const char * strp, struct rule * rulep)); 115static void gmtload P((struct state * sp)); 116static void gmtsub P((const time_t * timep, long offset, 117 struct tm * tmp)); 118static void localsub P((const time_t * timep, long offset, 119 struct tm * tmp)); 120static int increment_overflow P((int * number, int delta)); 121static int normalize_overflow P((int * tensptr, int * unitsptr, 122 int base)); 123static void settzname P((void));
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119static time_t time1 P((struct tm * tmp, void (* funcp)(),
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124static time_t time1 P((struct tm * tmp, 125 void(*funcp) P((const time_t *, 126 long, struct tm *)), |
127 long offset));
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121static time_t time2 P((struct tm *tmp, void (* funcp)(),
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128static time_t time2 P((struct tm *tmp, 129 void(*funcp) P((const time_t *, 130 long, struct tm*)), |
131 long offset, int * okayp)); 132static void timesub P((const time_t * timep, long offset, 133 const struct state * sp, struct tm * tmp)); 134static int tmcomp P((const struct tm * atmp, 135 const struct tm * btmp)); 136static time_t transtime P((time_t janfirst, int year, 137 const struct rule * rulep, long offset)); 138static int tzload P((const char * name, struct state * sp)); 139static int tzparse P((const char * name, struct state * sp, 140 int lastditch)); 141 142#ifdef ALL_STATE 143static struct state * lclptr; 144static struct state * gmtptr; 145#endif /* defined ALL_STATE */ 146 147#ifndef ALL_STATE 148static struct state lclmem; 149static struct state gmtmem; 150#define lclptr (&lclmem) 151#define gmtptr (&gmtmem) 152#endif /* State Farm */ 153
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154#ifndef TZ_STRLEN_MAX 155#define TZ_STRLEN_MAX 255 156#endif /* !defined TZ_STRLEN_MAX */ 157 158static char lcl_TZname[TZ_STRLEN_MAX + 1]; |
159static int lcl_is_set; 160static int gmt_is_set; 161 162char * tzname[2] = {
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149 WILDABBR,
150 WILDABBR
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163 wildabbr, 164 wildabbr |
165}; 166
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167/* 168** Section 4.12.3 of X3.159-1989 requires that 169** Except for the strftime function, these functions [asctime, 170** ctime, gmtime, localtime] return values in one of two static 171** objects: a broken-down time structure and an array of char. 172** Thanks to Paul Eggert (eggert@twinsun.com) for noting this. 173*/ 174 175static struct tm tm; 176 |
177#ifdef USG_COMPAT 178time_t timezone = 0; 179int daylight = 0; 180#endif /* defined USG_COMPAT */ 181 182#ifdef ALTZONE 183time_t altzone = 0; 184#endif /* defined ALTZONE */ 185 186static long 187detzcode(codep) 188const char * const codep; 189{ 190 register long result; 191 register int i; 192
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169 result = 0;
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193 result = (codep[0] & 0x80) ? ~0L : 0L; |
194 for (i = 0; i < 4; ++i) 195 result = (result << 8) | (codep[i] & 0xff); 196 return result; 197} 198 199static void
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176settzname()
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200settzname P((void)) |
201{
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178 register const struct state * const sp = lclptr;
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202 register struct state * const sp = lclptr; |
203 register int i; 204
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181 tzname[0] = WILDABBR;
182 tzname[1] = WILDABBR;
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205 tzname[0] = wildabbr; 206 tzname[1] = wildabbr; |
207#ifdef USG_COMPAT 208 daylight = 0; 209 timezone = 0; 210#endif /* defined USG_COMPAT */ 211#ifdef ALTZONE 212 altzone = 0; 213#endif /* defined ALTZONE */ 214#ifdef ALL_STATE 215 if (sp == NULL) {
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192 tzname[0] = tzname[1] = GMT;
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216 tzname[0] = tzname[1] = gmt; |
217 return; 218 } 219#endif /* defined ALL_STATE */ 220 for (i = 0; i < sp->typecnt; ++i) { 221 register const struct ttinfo * const ttisp = &sp->ttis[i]; 222 223 tzname[ttisp->tt_isdst] =
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200 (char *) &sp->chars[ttisp->tt_abbrind];
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224 &sp->chars[ttisp->tt_abbrind]; |
225#ifdef USG_COMPAT 226 if (ttisp->tt_isdst) 227 daylight = 1; 228 if (i == 0 || !ttisp->tt_isdst) 229 timezone = -(ttisp->tt_gmtoff); 230#endif /* defined USG_COMPAT */ 231#ifdef ALTZONE 232 if (i == 0 || ttisp->tt_isdst) 233 altzone = -(ttisp->tt_gmtoff); 234#endif /* defined ALTZONE */ 235 } 236 /* 237 ** And to get the latest zone names into tzname. . . 238 */ 239 for (i = 0; i < sp->timecnt; ++i) { 240 register const struct ttinfo * const ttisp = 241 &sp->ttis[ 242 sp->types[i]]; 243 244 tzname[ttisp->tt_isdst] =
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221 (char *) &sp->chars[ttisp->tt_abbrind];
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245 &sp->chars[ttisp->tt_abbrind]; |
246 } 247} 248 249static int 250tzload(name, sp) 251register const char * name; 252register struct state * const sp; 253{ 254 register const char * p; 255 register int i; 256 register int fid; 257 258 if (name == NULL && (name = TZDEFAULT) == NULL) 259 return -1; 260 {
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237 register int doaccess;
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261 register int doaccess; 262 /* 263 ** Section 4.9.1 of the C standard says that 264 ** "FILENAME_MAX expands to an integral constant expression 265 ** that is the sie needed for an array of char large enough 266 ** to hold the longest file name string that the implementation 267 ** guarantees can be opened." 268 */ |
269 char fullname[FILENAME_MAX + 1]; 270 271 if (name[0] == ':') 272 ++name; 273 doaccess = name[0] == '/'; 274 if (!doaccess) { 275 if ((p = TZDIR) == NULL) 276 return -1; 277 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 278 return -1; 279 (void) strcpy(fullname, p); 280 (void) strcat(fullname, "/"); 281 (void) strcat(fullname, name); 282 /* 283 ** Set doaccess if '.' (as in "../") shows up in name. 284 */ 285 if (strchr(name, '.') != NULL) 286 doaccess = TRUE; 287 name = fullname; 288 }
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258 if (doaccess && access(name, ACCESS_MODE) != 0)
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289 if (doaccess && access(name, R_OK) != 0) |
290 return -1; 291 if ((fid = open(name, OPEN_MODE)) == -1) 292 return -1; 293 } 294 {
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264 register const struct tzhead * tzhp;
265 char buf[sizeof *sp + sizeof *tzhp];
266 int ttisstdcnt;
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295 struct tzhead * tzhp; 296 char buf[sizeof *sp + sizeof *tzhp]; 297 int ttisstdcnt; 298 int ttisgmtcnt; |
299 300 i = read(fid, buf, sizeof buf);
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269 if (close(fid) != 0 || i < sizeof *tzhp)
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301 if (close(fid) != 0) |
302 return -1;
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271 tzhp = (struct tzhead *) buf;
272 ttisstdcnt = (int) detzcode(tzhp->tzh_ttisstdcnt);
273 sp->leapcnt = (int) detzcode(tzhp->tzh_leapcnt);
274 sp->timecnt = (int) detzcode(tzhp->tzh_timecnt);
275 sp->typecnt = (int) detzcode(tzhp->tzh_typecnt);
276 sp->charcnt = (int) detzcode(tzhp->tzh_charcnt);
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303 p = buf; 304 p += sizeof tzhp->tzh_reserved; 305 ttisstdcnt = (int) detzcode(p); 306 p += 4; 307 ttisgmtcnt = (int) detzcode(p); 308 p += 4; 309 sp->leapcnt = (int) detzcode(p); 310 p += 4; 311 sp->timecnt = (int) detzcode(p); 312 p += 4; 313 sp->typecnt = (int) detzcode(p); 314 p += 4; 315 sp->charcnt = (int) detzcode(p); 316 p += 4; |
317 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 318 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 319 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 320 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
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281 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0))
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321 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 322 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) |
323 return -1;
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283 if (i < sizeof *tzhp +
284 sp->timecnt * (4 + sizeof (char)) +
285 sp->typecnt * (4 + 2 * sizeof (char)) +
286 sp->charcnt * sizeof (char) +
287 sp->leapcnt * 2 * 4 +
288 ttisstdcnt * sizeof (char))
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324 if (i - (p - buf) < sp->timecnt * 4 + /* ats */ 325 sp->timecnt + /* types */ 326 sp->typecnt * (4 + 2) + /* ttinfos */ 327 sp->charcnt + /* chars */ 328 sp->leapcnt * (4 + 4) + /* lsinfos */ 329 ttisstdcnt + /* ttisstds */ 330 ttisgmtcnt) /* ttisgmts */ |
331 return -1;
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290 p = buf + sizeof *tzhp;
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332 for (i = 0; i < sp->timecnt; ++i) { 333 sp->ats[i] = detzcode(p); 334 p += 4; 335 } 336 for (i = 0; i < sp->timecnt; ++i) { 337 sp->types[i] = (unsigned char) *p++; 338 if (sp->types[i] >= sp->typecnt) 339 return -1; 340 } 341 for (i = 0; i < sp->typecnt; ++i) { 342 register struct ttinfo * ttisp; 343 344 ttisp = &sp->ttis[i]; 345 ttisp->tt_gmtoff = detzcode(p); 346 p += 4; 347 ttisp->tt_isdst = (unsigned char) *p++; 348 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 349 return -1; 350 ttisp->tt_abbrind = (unsigned char) *p++; 351 if (ttisp->tt_abbrind < 0 || 352 ttisp->tt_abbrind > sp->charcnt) 353 return -1; 354 } 355 for (i = 0; i < sp->charcnt; ++i) 356 sp->chars[i] = *p++; 357 sp->chars[i] = '\0'; /* ensure '\0' at end */ 358 for (i = 0; i < sp->leapcnt; ++i) { 359 register struct lsinfo * lsisp; 360 361 lsisp = &sp->lsis[i]; 362 lsisp->ls_trans = detzcode(p); 363 p += 4; 364 lsisp->ls_corr = detzcode(p); 365 p += 4; 366 } 367 for (i = 0; i < sp->typecnt; ++i) { 368 register struct ttinfo * ttisp; 369 370 ttisp = &sp->ttis[i]; 371 if (ttisstdcnt == 0) 372 ttisp->tt_ttisstd = FALSE; 373 else { 374 ttisp->tt_ttisstd = *p++; 375 if (ttisp->tt_ttisstd != TRUE && 376 ttisp->tt_ttisstd != FALSE) 377 return -1; 378 } 379 }
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380 for (i = 0; i < sp->typecnt; ++i) { 381 register struct ttinfo * ttisp; 382 383 ttisp = &sp->ttis[i]; 384 if (ttisgmtcnt == 0) 385 ttisp->tt_ttisgmt = FALSE; 386 else { 387 ttisp->tt_ttisgmt = *p++; 388 if (ttisp->tt_ttisgmt != TRUE && 389 ttisp->tt_ttisgmt != FALSE) 390 return -1; 391 } 392 } |
393 } 394 return 0; 395} 396 397static const int mon_lengths[2][MONSPERYEAR] = { 398 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 399 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 400}; 401 402static const int year_lengths[2] = { 403 DAYSPERNYEAR, DAYSPERLYEAR 404}; 405 406/* 407** Given a pointer into a time zone string, scan until a character that is not 408** a valid character in a zone name is found. Return a pointer to that 409** character. 410*/ 411 412static const char * 413getzname(strp) 414register const char * strp; 415{ 416 register char c; 417 418 while ((c = *strp) != '\0' && !isdigit(c) && c != ',' && c != '-' && 419 c != '+') 420 ++strp; 421 return strp; 422} 423 424/* 425** Given a pointer into a time zone string, extract a number from that string. 426** Check that the number is within a specified range; if it is not, return 427** NULL. 428** Otherwise, return a pointer to the first character not part of the number. 429*/ 430 431static const char * 432getnum(strp, nump, min, max) 433register const char * strp; 434int * const nump; 435const int min; 436const int max; 437{ 438 register char c; 439 register int num; 440 441 if (strp == NULL || !isdigit(*strp)) 442 return NULL; 443 num = 0; 444 while ((c = *strp) != '\0' && isdigit(c)) { 445 num = num * 10 + (c - '0'); 446 if (num > max) 447 return NULL; /* illegal value */ 448 ++strp; 449 } 450 if (num < min) 451 return NULL; /* illegal value */ 452 *nump = num; 453 return strp; 454} 455 456/* 457** Given a pointer into a time zone string, extract a number of seconds, 458** in hh[:mm[:ss]] form, from the string. 459** If any error occurs, return NULL. 460** Otherwise, return a pointer to the first character not part of the number 461** of seconds. 462*/ 463 464static const char * 465getsecs(strp, secsp) 466register const char * strp; 467long * const secsp; 468{ 469 int num; 470
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417 strp = getnum(strp, &num, 0, HOURSPERDAY);
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471 /* 472 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 473 ** "M10.4.6/26", which does not conform to Posix, 474 ** but which specifies the equivalent of 475 ** ``02:00 on the first Sunday on or after 23 Oct''. 476 */ 477 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); |
478 if (strp == NULL) 479 return NULL;
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420 *secsp = num * SECSPERHOUR;
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480 *secsp = num * (long) SECSPERHOUR; |
481 if (*strp == ':') { 482 ++strp; 483 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 484 if (strp == NULL) 485 return NULL; 486 *secsp += num * SECSPERMIN; 487 if (*strp == ':') { 488 ++strp;
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429 strp = getnum(strp, &num, 0, SECSPERMIN - 1);
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489 /* `SECSPERMIN' allows for leap seconds. */ 490 strp = getnum(strp, &num, 0, SECSPERMIN); |
491 if (strp == NULL) 492 return NULL; 493 *secsp += num; 494 } 495 } 496 return strp; 497} 498 499/* 500** Given a pointer into a time zone string, extract an offset, in 501** [+-]hh[:mm[:ss]] form, from the string. 502** If any error occurs, return NULL. 503** Otherwise, return a pointer to the first character not part of the time. 504*/ 505 506static const char * 507getoffset(strp, offsetp) 508register const char * strp; 509long * const offsetp; 510{ 511 register int neg; 512 513 if (*strp == '-') { 514 neg = 1; 515 ++strp; 516 } else if (isdigit(*strp) || *strp++ == '+') 517 neg = 0; 518 else return NULL; /* illegal offset */ 519 strp = getsecs(strp, offsetp); 520 if (strp == NULL) 521 return NULL; /* illegal time */ 522 if (neg) 523 *offsetp = -*offsetp; 524 return strp; 525} 526 527/* 528** Given a pointer into a time zone string, extract a rule in the form 529** date[/time]. See POSIX section 8 for the format of "date" and "time". 530** If a valid rule is not found, return NULL. 531** Otherwise, return a pointer to the first character not part of the rule. 532*/ 533 534static const char * 535getrule(strp, rulep) 536const char * strp; 537register struct rule * const rulep; 538{ 539 if (*strp == 'J') { 540 /* 541 ** Julian day. 542 */ 543 rulep->r_type = JULIAN_DAY; 544 ++strp; 545 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 546 } else if (*strp == 'M') { 547 /* 548 ** Month, week, day. 549 */ 550 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 551 ++strp; 552 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 553 if (strp == NULL) 554 return NULL; 555 if (*strp++ != '.') 556 return NULL; 557 strp = getnum(strp, &rulep->r_week, 1, 5); 558 if (strp == NULL) 559 return NULL; 560 if (*strp++ != '.') 561 return NULL; 562 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 563 } else if (isdigit(*strp)) { 564 /* 565 ** Day of year. 566 */ 567 rulep->r_type = DAY_OF_YEAR; 568 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 569 } else return NULL; /* invalid format */ 570 if (strp == NULL) 571 return NULL; 572 if (*strp == '/') { 573 /* 574 ** Time specified. 575 */ 576 ++strp; 577 strp = getsecs(strp, &rulep->r_time); 578 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 579 return strp; 580} 581 582/* 583** Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the 584** year, a rule, and the offset from GMT at the time that rule takes effect, 585** calculate the Epoch-relative time that rule takes effect. 586*/ 587 588static time_t 589transtime(janfirst, year, rulep, offset) 590const time_t janfirst; 591const int year; 592register const struct rule * const rulep; 593const long offset; 594{ 595 register int leapyear; 596 register time_t value; 597 register int i; 598 int d, m1, yy0, yy1, yy2, dow; 599
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600 INITIALIZE(value); |
601 leapyear = isleap(year); 602 switch (rulep->r_type) { 603 604 case JULIAN_DAY: 605 /* 606 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 607 ** years. 608 ** In non-leap years, or if the day number is 59 or less, just 609 ** add SECSPERDAY times the day number-1 to the time of 610 ** January 1, midnight, to get the day. 611 */ 612 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 613 if (leapyear && rulep->r_day >= 60) 614 value += SECSPERDAY; 615 break; 616 617 case DAY_OF_YEAR: 618 /* 619 ** n - day of year. 620 ** Just add SECSPERDAY times the day number to the time of 621 ** January 1, midnight, to get the day. 622 */ 623 value = janfirst + rulep->r_day * SECSPERDAY; 624 break; 625 626 case MONTH_NTH_DAY_OF_WEEK: 627 /* 628 ** Mm.n.d - nth "dth day" of month m. 629 */ 630 value = janfirst; 631 for (i = 0; i < rulep->r_mon - 1; ++i) 632 value += mon_lengths[leapyear][i] * SECSPERDAY; 633 634 /* 635 ** Use Zeller's Congruence to get day-of-week of first day of 636 ** month. 637 */ 638 m1 = (rulep->r_mon + 9) % 12 + 1; 639 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 640 yy1 = yy0 / 100; 641 yy2 = yy0 % 100; 642 dow = ((26 * m1 - 2) / 10 + 643 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 644 if (dow < 0) 645 dow += DAYSPERWEEK; 646 647 /* 648 ** "dow" is the day-of-week of the first day of the month. Get 649 ** the day-of-month (zero-origin) of the first "dow" day of the 650 ** month. 651 */ 652 d = rulep->r_day - dow; 653 if (d < 0) 654 d += DAYSPERWEEK; 655 for (i = 1; i < rulep->r_week; ++i) { 656 if (d + DAYSPERWEEK >= 657 mon_lengths[leapyear][rulep->r_mon - 1]) 658 break; 659 d += DAYSPERWEEK; 660 } 661 662 /* 663 ** "d" is the day-of-month (zero-origin) of the day we want. 664 */ 665 value += d * SECSPERDAY; 666 break; 667 } 668 669 /* 670 ** "value" is the Epoch-relative time of 00:00:00 GMT on the day in 671 ** question. To get the Epoch-relative time of the specified local 672 ** time on that day, add the transition time and the current offset 673 ** from GMT. 674 */ 675 return value + rulep->r_time + offset; 676} 677 678/* 679** Given a POSIX section 8-style TZ string, fill in the rule tables as 680** appropriate. 681*/ 682 683static int 684tzparse(name, sp, lastditch) 685const char * name; 686register struct state * const sp; 687const int lastditch; 688{ 689 const char * stdname; 690 const char * dstname;
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629 int stdlen;
630 int dstlen;
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691 size_t stdlen; 692 size_t dstlen; |
693 long stdoffset; 694 long dstoffset; 695 register time_t * atp; 696 register unsigned char * typep; 697 register char * cp; 698 register int load_result; 699
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700 INITIALIZE(dstname); |
701 stdname = name; 702 if (lastditch) { 703 stdlen = strlen(name); /* length of standard zone name */ 704 name += stdlen; 705 if (stdlen >= sizeof sp->chars) 706 stdlen = (sizeof sp->chars) - 1; 707 } else { 708 name = getzname(name); 709 stdlen = name - stdname; 710 if (stdlen < 3) 711 return -1; 712 } 713 if (*name == '\0') 714 return -1; /* was "stdoffset = 0;" */ 715 else { 716 name = getoffset(name, &stdoffset); 717 if (name == NULL) 718 return -1; 719 } 720 load_result = tzload(TZDEFRULES, sp); 721 if (load_result != 0) 722 sp->leapcnt = 0; /* so, we're off a little */ 723 if (*name != '\0') { 724 dstname = name; 725 name = getzname(name); 726 dstlen = name - dstname; /* length of DST zone name */ 727 if (dstlen < 3) 728 return -1; 729 if (*name != '\0' && *name != ',' && *name != ';') { 730 name = getoffset(name, &dstoffset); 731 if (name == NULL) 732 return -1; 733 } else dstoffset = stdoffset - SECSPERHOUR; 734 if (*name == ',' || *name == ';') { 735 struct rule start; 736 struct rule end; 737 register int year; 738 register time_t janfirst; 739 time_t starttime; 740 time_t endtime; 741 742 ++name; 743 if ((name = getrule(name, &start)) == NULL) 744 return -1; 745 if (*name++ != ',') 746 return -1; 747 if ((name = getrule(name, &end)) == NULL) 748 return -1; 749 if (*name != '\0') 750 return -1; 751 sp->typecnt = 2; /* standard time and DST */ 752 /* 753 ** Two transitions per year, from EPOCH_YEAR to 2037. 754 */ 755 sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); 756 if (sp->timecnt > TZ_MAX_TIMES) 757 return -1; 758 sp->ttis[0].tt_gmtoff = -dstoffset; 759 sp->ttis[0].tt_isdst = 1; 760 sp->ttis[0].tt_abbrind = stdlen + 1; 761 sp->ttis[1].tt_gmtoff = -stdoffset; 762 sp->ttis[1].tt_isdst = 0; 763 sp->ttis[1].tt_abbrind = 0; 764 atp = sp->ats; 765 typep = sp->types; 766 janfirst = 0; 767 for (year = EPOCH_YEAR; year <= 2037; ++year) { 768 starttime = transtime(janfirst, year, &start, 769 stdoffset); 770 endtime = transtime(janfirst, year, &end, 771 dstoffset); 772 if (starttime > endtime) { 773 *atp++ = endtime; 774 *typep++ = 1; /* DST ends */ 775 *atp++ = starttime; 776 *typep++ = 0; /* DST begins */ 777 } else { 778 *atp++ = starttime; 779 *typep++ = 0; /* DST begins */ 780 *atp++ = endtime; 781 *typep++ = 1; /* DST ends */ 782 } 783 janfirst += year_lengths[isleap(year)] * 784 SECSPERDAY; 785 } 786 } else {
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724 int sawstd;
725 int sawdst;
726 long stdfix;
727 long dstfix;
728 long oldfix;
729 int isdst;
|
787 register long theirstdoffset; 788 register long theirdstoffset; 789 register long theiroffset; 790 register int isdst; |
791 register int i;
|
792 register int j; |
793 794 if (*name != '\0') 795 return -1; 796 if (load_result != 0) 797 return -1; 798 /*
|
737 ** Compute the difference between the real and
738 ** prototype standard and summer time offsets
739 ** from GMT, and put the real standard and summer
740 ** time offsets into the rules in place of the
741 ** prototype offsets.
|
799 ** Initial values of theirstdoffset and theirdstoffset. |
800 */
|
743 sawstd = FALSE;
744 sawdst = FALSE;
745 stdfix = 0;
746 dstfix = 0;
747 for (i = 0; i < sp->typecnt; ++i) {
748 if (sp->ttis[i].tt_isdst) {
749 oldfix = dstfix;
750 dstfix = sp->ttis[i].tt_gmtoff +
751 dstoffset;
752 if (sawdst && (oldfix != dstfix))
753 return -1;
754 sp->ttis[i].tt_gmtoff = -dstoffset;
755 sp->ttis[i].tt_abbrind = stdlen + 1;
756 sawdst = TRUE;
757 } else {
758 oldfix = stdfix;
759 stdfix = sp->ttis[i].tt_gmtoff +
760 stdoffset;
761 if (sawstd && (oldfix != stdfix))
762 return -1;
763 sp->ttis[i].tt_gmtoff = -stdoffset;
764 sp->ttis[i].tt_abbrind = 0;
765 sawstd = TRUE;
|
801 theirstdoffset = 0; 802 for (i = 0; i < sp->timecnt; ++i) { 803 j = sp->types[i]; 804 if (!sp->ttis[j].tt_isdst) { 805 theirstdoffset = -sp->ttis[j].tt_gmtoff; 806 break; |
807 } 808 }
|
809 theirdstoffset = 0; 810 for (i = 0; i < sp->timecnt; ++i) { 811 j = sp->types[i]; 812 if (sp->ttis[j].tt_isdst) { 813 theirdstoffset = -sp->ttis[j].tt_gmtoff; 814 break; 815 } 816 } |
817 /*
|
769 ** Make sure we have both standard and summer time.
|
818 ** Initially we're assumed to be in standard time. |
819 */
|
771 if (!sawdst || !sawstd)
772 return -1;
|
820 isdst = FALSE; 821 theiroffset = theirstdoffset; |
822 /*
|
774 ** Now correct the transition times by shifting
775 ** them by the difference between the real and
776 ** prototype offsets. Note that this difference
777 ** can be different in standard and summer time;
778 ** the prototype probably has a 1-hour difference
779 ** between standard and summer time, but a different
780 ** difference can be specified in TZ.
|
823 ** Now juggle transition times and types 824 ** tracking offsets as you do. |
825 */
|
782 isdst = FALSE; /* we start in standard time */
|
826 for (i = 0; i < sp->timecnt; ++i) {
|
784 register const struct ttinfo * ttisp;
785
786 /*
787 ** If summer time is in effect, and the
788 ** transition time was not specified as
789 ** standard time, add the summer time
790 ** offset to the transition time;
791 ** otherwise, add the standard time offset
792 ** to the transition time.
793 */
794 ttisp = &sp->ttis[sp->types[i]];
795 sp->ats[i] +=
796 (isdst && !ttisp->tt_ttisstd) ?
797 dstfix : stdfix;
798 isdst = ttisp->tt_isdst;
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827 j = sp->types[i]; 828 sp->types[i] = sp->ttis[j].tt_isdst; 829 if (sp->ttis[j].tt_ttisgmt) { 830 /* No adjustment to transition time */ 831 } else { 832 /* 833 ** If summer time is in effect, and the 834 ** transition time was not specified as 835 ** standard time, add the summer time 836 ** offset to the transition time; 837 ** otherwise, add the standard time 838 ** offset to the transition time. 839 */ 840 /* 841 ** Transitions from DST to DDST 842 ** will effectively disappear since 843 ** POSIX provides for only one DST 844 ** offset. 845 */ 846 if (isdst && !sp->ttis[j].tt_ttisstd) { 847 sp->ats[i] += dstoffset - 848 theirdstoffset; 849 } else { 850 sp->ats[i] += stdoffset - 851 theirstdoffset; 852 } 853 } 854 theiroffset = -sp->ttis[j].tt_gmtoff; 855 if (sp->ttis[j].tt_isdst) 856 theirdstoffset = theiroffset; 857 else theirstdoffset = theiroffset; |
858 }
|
859 /* 860 ** Finally, fill in ttis. 861 ** ttisstd and ttisgmt need not be handled. 862 */ 863 sp->ttis[0].tt_gmtoff = -stdoffset; 864 sp->ttis[0].tt_isdst = FALSE; 865 sp->ttis[0].tt_abbrind = 0; 866 sp->ttis[1].tt_gmtoff = -dstoffset; 867 sp->ttis[1].tt_isdst = TRUE; 868 sp->ttis[1].tt_abbrind = stdlen + 1; |
869 } 870 } else { 871 dstlen = 0; 872 sp->typecnt = 1; /* only standard time */ 873 sp->timecnt = 0; 874 sp->ttis[0].tt_gmtoff = -stdoffset; 875 sp->ttis[0].tt_isdst = 0; 876 sp->ttis[0].tt_abbrind = 0; 877 } 878 sp->charcnt = stdlen + 1; 879 if (dstlen != 0) 880 sp->charcnt += dstlen + 1; 881 if (sp->charcnt > sizeof sp->chars) 882 return -1; 883 cp = sp->chars; 884 (void) strncpy(cp, stdname, stdlen); 885 cp += stdlen; 886 *cp++ = '\0'; 887 if (dstlen != 0) { 888 (void) strncpy(cp, dstname, dstlen); 889 *(cp + dstlen) = '\0'; 890 } 891 return 0; 892} 893 894static void 895gmtload(sp) 896struct state * const sp; 897{
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829 if (tzload(GMT, sp) != 0)
830 (void) tzparse(GMT, sp, TRUE);
|
898 if (tzload(gmt, sp) != 0) 899 (void) tzparse(gmt, sp, TRUE); |
900} 901 902#ifndef STD_INSPIRED
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903/* 904** A non-static declaration of tzsetwall in a system header file 905** may cause a warning about this upcoming static declaration... 906*/ |
907static 908#endif /* !defined STD_INSPIRED */ 909void
|
837tzsetwall()
|
910tzsetwall P((void)) |
911{
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839 lcl_is_set = TRUE;
|
912 if (lcl_is_set < 0) 913 return; 914 lcl_is_set = -1; 915 |
916#ifdef ALL_STATE 917 if (lclptr == NULL) { 918 lclptr = (struct state *) malloc(sizeof *lclptr); 919 if (lclptr == NULL) { 920 settzname(); /* all we can do */ 921 return; 922 } 923 } 924#endif /* defined ALL_STATE */ 925 if (tzload((char *) NULL, lclptr) != 0) 926 gmtload(lclptr); 927 settzname(); 928} 929 930void
|
855tzset()
|
931tzset P((void)) |
932{ 933 register const char * name; 934 935 name = getenv("TZ"); 936 if (name == NULL) { 937 tzsetwall(); 938 return; 939 }
|
864 lcl_is_set = TRUE;
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940 941 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 942 return; 943 lcl_is_set = (strlen(name) < sizeof(lcl_TZname)); 944 if (lcl_is_set) 945 (void) strcpy(lcl_TZname, name); 946 |
947#ifdef ALL_STATE 948 if (lclptr == NULL) { 949 lclptr = (struct state *) malloc(sizeof *lclptr); 950 if (lclptr == NULL) { 951 settzname(); /* all we can do */ 952 return; 953 } 954 } 955#endif /* defined ALL_STATE */ 956 if (*name == '\0') { 957 /* 958 ** User wants it fast rather than right. 959 */ 960 lclptr->leapcnt = 0; /* so, we're off a little */ 961 lclptr->timecnt = 0; 962 lclptr->ttis[0].tt_gmtoff = 0; 963 lclptr->ttis[0].tt_abbrind = 0;
|
882 (void) strcpy(lclptr->chars, GMT);
|
964 (void) strcpy(lclptr->chars, gmt); |
965 } else if (tzload(name, lclptr) != 0) 966 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 967 (void) gmtload(lclptr); 968 settzname(); 969} 970 971/* 972** The easy way to behave "as if no library function calls" localtime 973** is to not call it--so we drop its guts into "localsub", which can be 974** freely called. (And no, the PANS doesn't require the above behavior-- 975** but it *is* desirable.) 976** 977** The unused offset argument is for the benefit of mktime variants. 978*/ 979 980/*ARGSUSED*/ 981static void 982localsub(timep, offset, tmp) 983const time_t * const timep; 984const long offset; 985struct tm * const tmp; 986{
|
905 register const struct state * sp;
|
987 register struct state * sp; |
988 register const struct ttinfo * ttisp; 989 register int i; 990 const time_t t = *timep; 991
|
910 if (!lcl_is_set)
911 tzset();
|
992 sp = lclptr; 993#ifdef ALL_STATE 994 if (sp == NULL) { 995 gmtsub(timep, offset, tmp); 996 return; 997 } 998#endif /* defined ALL_STATE */ 999 if (sp->timecnt == 0 || t < sp->ats[0]) { 1000 i = 0; 1001 while (sp->ttis[i].tt_isdst) 1002 if (++i >= sp->typecnt) { 1003 i = 0; 1004 break; 1005 } 1006 } else { 1007 for (i = 1; i < sp->timecnt; ++i) 1008 if (t < sp->ats[i]) 1009 break; 1010 i = sp->types[i - 1]; 1011 } 1012 ttisp = &sp->ttis[i]; 1013 /* 1014 ** To get (wrong) behavior that's compatible with System V Release 2.0 1015 ** you'd replace the statement below with 1016 ** t += ttisp->tt_gmtoff; 1017 ** timesub(&t, 0L, sp, tmp); 1018 */ 1019 timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1020 tmp->tm_isdst = ttisp->tt_isdst;
|
941 tzname[tmp->tm_isdst] = (char *) &sp->chars[ttisp->tt_abbrind];
|
1021 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; |
1022#ifdef TM_ZONE
|
943 tmp->TM_ZONE = (char *)&sp->chars[ttisp->tt_abbrind];
|
1023 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; |
1024#endif /* defined TM_ZONE */ 1025} 1026 1027struct tm * 1028localtime(timep) 1029const time_t * const timep; 1030{
|
951 static struct tm tm;
952
|
1031 tzset(); |
1032 localsub(timep, 0L, &tm); 1033 return &tm; 1034} 1035 1036/* 1037** gmtsub is to gmtime as localsub is to localtime. 1038*/ 1039 1040static void 1041gmtsub(timep, offset, tmp) 1042const time_t * const timep; 1043const long offset; 1044struct tm * const tmp; 1045{ 1046 if (!gmt_is_set) { 1047 gmt_is_set = TRUE; 1048#ifdef ALL_STATE 1049 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1050 if (gmtptr != NULL) 1051#endif /* defined ALL_STATE */ 1052 gmtload(gmtptr); 1053 } 1054 timesub(timep, offset, gmtptr, tmp); 1055#ifdef TM_ZONE 1056 /* 1057 ** Could get fancy here and deliver something such as 1058 ** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero, 1059 ** but this is no time for a treasure hunt. 1060 */ 1061 if (offset != 0)
|
983 tmp->TM_ZONE = WILDABBR;
|
1062 tmp->TM_ZONE = wildabbr; |
1063 else { 1064#ifdef ALL_STATE 1065 if (gmtptr == NULL)
|
987 tmp->TM_ZONE = GMT;
|
1066 tmp->TM_ZONE = gmt; |
1067 else tmp->TM_ZONE = gmtptr->chars; 1068#endif /* defined ALL_STATE */ 1069#ifndef ALL_STATE 1070 tmp->TM_ZONE = gmtptr->chars; 1071#endif /* State Farm */ 1072 } 1073#endif /* defined TM_ZONE */ 1074} 1075 1076struct tm * 1077gmtime(timep) 1078const time_t * const timep; 1079{
|
1001 static struct tm tm;
1002
|
1080 gmtsub(timep, 0L, &tm); 1081 return &tm; 1082} 1083 1084#ifdef STD_INSPIRED 1085 1086struct tm * 1087offtime(timep, offset) 1088const time_t * const timep; 1089const long offset; 1090{
|
1014 static struct tm tm;
1015
|
1091 gmtsub(timep, offset, &tm); 1092 return &tm; 1093} 1094 1095#endif /* defined STD_INSPIRED */ 1096 1097static void 1098timesub(timep, offset, sp, tmp) 1099const time_t * const timep; 1100const long offset; 1101register const struct state * const sp; 1102register struct tm * const tmp; 1103{ 1104 register const struct lsinfo * lp; 1105 register long days; 1106 register long rem; 1107 register int y; 1108 register int yleap; 1109 register const int * ip; 1110 register long corr; 1111 register int hit; 1112 register int i; 1113 1114 corr = 0; 1115 hit = 0; 1116#ifdef ALL_STATE 1117 i = (sp == NULL) ? 0 : sp->leapcnt; 1118#endif /* defined ALL_STATE */ 1119#ifndef ALL_STATE 1120 i = sp->leapcnt; 1121#endif /* State Farm */ 1122 while (--i >= 0) { 1123 lp = &sp->lsis[i]; 1124 if (*timep >= lp->ls_trans) { 1125 if (*timep == lp->ls_trans) { 1126 hit = ((i == 0 && lp->ls_corr > 0) || 1127 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1128 if (hit) 1129 while (i > 0 && 1130 sp->lsis[i].ls_trans == 1131 sp->lsis[i - 1].ls_trans + 1 && 1132 sp->lsis[i].ls_corr == 1133 sp->lsis[i - 1].ls_corr + 1) { 1134 ++hit; 1135 --i; 1136 } 1137 } 1138 corr = lp->ls_corr; 1139 break; 1140 } 1141 } 1142 days = *timep / SECSPERDAY; 1143 rem = *timep % SECSPERDAY; 1144#ifdef mc68k 1145 if (*timep == 0x80000000) { 1146 /* 1147 ** A 3B1 muffs the division on the most negative number. 1148 */ 1149 days = -24855; 1150 rem = -11648; 1151 }
|
1077#endif /* mc68k */
|
1152#endif /* defined mc68k */ |
1153 rem += (offset - corr); 1154 while (rem < 0) { 1155 rem += SECSPERDAY; 1156 --days; 1157 } 1158 while (rem >= SECSPERDAY) { 1159 rem -= SECSPERDAY; 1160 ++days; 1161 } 1162 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1163 rem = rem % SECSPERHOUR; 1164 tmp->tm_min = (int) (rem / SECSPERMIN); 1165 tmp->tm_sec = (int) (rem % SECSPERMIN); 1166 if (hit) 1167 /* 1168 ** A positive leap second requires a special 1169 ** representation. This uses "... ??:59:60" et seq. 1170 */ 1171 tmp->tm_sec += hit; 1172 tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); 1173 if (tmp->tm_wday < 0) 1174 tmp->tm_wday += DAYSPERWEEK; 1175 y = EPOCH_YEAR; 1176 if (days >= 0) 1177 for ( ; ; ) { 1178 yleap = isleap(y); 1179 if (days < (long) year_lengths[yleap]) 1180 break; 1181 ++y; 1182 days = days - (long) year_lengths[yleap]; 1183 } 1184 else do { 1185 --y; 1186 yleap = isleap(y); 1187 days = days + (long) year_lengths[yleap]; 1188 } while (days < 0); 1189 tmp->tm_year = y - TM_YEAR_BASE; 1190 tmp->tm_yday = (int) days; 1191 ip = mon_lengths[yleap]; 1192 for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1193 days = days - (long) ip[tmp->tm_mon]; 1194 tmp->tm_mday = (int) (days + 1); 1195 tmp->tm_isdst = 0; 1196#ifdef TM_GMTOFF 1197 tmp->TM_GMTOFF = offset; 1198#endif /* defined TM_GMTOFF */ 1199} 1200 1201char * 1202ctime(timep) 1203const time_t * const timep; 1204{
|
1205/* 1206** Section 4.12.3.2 of X3.159-1989 requires that 1207** The ctime funciton converts the calendar time pointed to by timer 1208** to local time in the form of a string. It is equivalent to 1209** asctime(localtime(timer)) 1210*/ |
1211 return asctime(localtime(timep)); 1212} 1213 1214/* 1215** Adapted from code provided by Robert Elz, who writes: 1216** The "best" way to do mktime I think is based on an idea of Bob 1217** Kridle's (so its said...) from a long time ago. (mtxinu!kridle now). 1218** It does a binary search of the time_t space. Since time_t's are 1219** just 32 bits, its a max of 32 iterations (even at 64 bits it 1220** would still be very reasonable). 1221*/ 1222 1223#ifndef WRONG 1224#define WRONG (-1) 1225#endif /* !defined WRONG */ 1226 1227/* 1228** Simplified normalize logic courtesy Paul Eggert (eggert@twinsun.com). 1229*/ 1230 1231static int 1232increment_overflow(number, delta) 1233int * number; 1234int delta; 1235{
|
1155 int number0;
|
1236 int number0; |
1237 1238 number0 = *number; 1239 *number += delta; 1240 return (*number < number0) != (delta < 0); 1241} 1242 1243static int 1244normalize_overflow(tensptr, unitsptr, base) 1245int * const tensptr; 1246int * const unitsptr; 1247const int base; 1248{ 1249 register int tensdelta; 1250 1251 tensdelta = (*unitsptr >= 0) ? 1252 (*unitsptr / base) : 1253 (-1 - (-1 - *unitsptr) / base); 1254 *unitsptr -= tensdelta * base; 1255 return increment_overflow(tensptr, tensdelta); 1256} 1257 1258static int 1259tmcomp(atmp, btmp) 1260register const struct tm * const atmp; 1261register const struct tm * const btmp; 1262{ 1263 register int result; 1264 1265 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1266 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1267 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1268 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1269 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1270 result = atmp->tm_sec - btmp->tm_sec; 1271 return result; 1272} 1273 1274static time_t 1275time2(tmp, funcp, offset, okayp) 1276struct tm * const tmp;
|
1196void (* const funcp)();
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1277void (* const funcp) P((const time_t*, long, struct tm*)); |
1278const long offset; 1279int * const okayp; 1280{ 1281 register const struct state * sp; 1282 register int dir; 1283 register int bits; 1284 register int i, j ; 1285 register int saved_seconds; 1286 time_t newt; 1287 time_t t; 1288 struct tm yourtm, mytm; 1289 1290 *okayp = FALSE; 1291 yourtm = *tmp; 1292 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1293 return WRONG; 1294 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1295 return WRONG; 1296 if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) 1297 return WRONG; 1298 /* 1299 ** Turn yourtm.tm_year into an actual year number for now. 1300 ** It is converted back to an offset from TM_YEAR_BASE later. 1301 */ 1302 if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) 1303 return WRONG; 1304 while (yourtm.tm_mday <= 0) { 1305 if (increment_overflow(&yourtm.tm_year, -1)) 1306 return WRONG; 1307 yourtm.tm_mday += year_lengths[isleap(yourtm.tm_year)]; 1308 } 1309 while (yourtm.tm_mday > DAYSPERLYEAR) { 1310 yourtm.tm_mday -= year_lengths[isleap(yourtm.tm_year)]; 1311 if (increment_overflow(&yourtm.tm_year, 1)) 1312 return WRONG; 1313 } 1314 for ( ; ; ) { 1315 i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; 1316 if (yourtm.tm_mday <= i) 1317 break; 1318 yourtm.tm_mday -= i; 1319 if (++yourtm.tm_mon >= MONSPERYEAR) { 1320 yourtm.tm_mon = 0; 1321 if (increment_overflow(&yourtm.tm_year, 1)) 1322 return WRONG; 1323 } 1324 } 1325 if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) 1326 return WRONG; 1327 if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { 1328 /* 1329 ** We can't set tm_sec to 0, because that might push the 1330 ** time below the minimum representable time. 1331 ** Set tm_sec to 59 instead. 1332 ** This assumes that the minimum representable time is 1333 ** not in the same minute that a leap second was deleted from, 1334 ** which is a safer assumption than using 58 would be. 1335 */ 1336 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1337 return WRONG; 1338 saved_seconds = yourtm.tm_sec; 1339 yourtm.tm_sec = SECSPERMIN - 1; 1340 } else { 1341 saved_seconds = yourtm.tm_sec; 1342 yourtm.tm_sec = 0; 1343 } 1344 /* 1345 ** Calculate the number of magnitude bits in a time_t 1346 ** (this works regardless of whether time_t is 1347 ** signed or unsigned, though lint complains if unsigned). 1348 */ 1349 for (bits = 0, t = 1; t > 0; ++bits, t <<= 1) 1350 continue; 1351 /* 1352 ** If time_t is signed, then 0 is the median value, 1353 ** if time_t is unsigned, then 1 << bits is median. 1354 */ 1355 t = (t < 0) ? 0 : ((time_t) 1 << bits); 1356 for ( ; ; ) { 1357 (*funcp)(&t, offset, &mytm); 1358 dir = tmcomp(&mytm, &yourtm); 1359 if (dir != 0) { 1360 if (bits-- < 0) 1361 return WRONG; 1362 if (bits < 0) 1363 --t; 1364 else if (dir > 0) 1365 t -= (time_t) 1 << bits; 1366 else t += (time_t) 1 << bits; 1367 continue; 1368 } 1369 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1370 break; 1371 /* 1372 ** Right time, wrong type. 1373 ** Hunt for right time, right type. 1374 ** It's okay to guess wrong since the guess 1375 ** gets checked. 1376 */ 1377 /* 1378 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1379 */ 1380 sp = (const struct state *) 1381 (((void *) funcp == (void *) localsub) ? 1382 lclptr : gmtptr); 1383#ifdef ALL_STATE 1384 if (sp == NULL) 1385 return WRONG; 1386#endif /* defined ALL_STATE */ 1387 for (i = 0; i < sp->typecnt; ++i) { 1388 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1389 continue; 1390 for (j = 0; j < sp->typecnt; ++j) { 1391 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1392 continue; 1393 newt = t + sp->ttis[j].tt_gmtoff - 1394 sp->ttis[i].tt_gmtoff; 1395 (*funcp)(&newt, offset, &mytm); 1396 if (tmcomp(&mytm, &yourtm) != 0) 1397 continue; 1398 if (mytm.tm_isdst != yourtm.tm_isdst) 1399 continue; 1400 /* 1401 ** We have a match. 1402 */ 1403 t = newt; 1404 goto label; 1405 } 1406 } 1407 return WRONG; 1408 } 1409label: 1410 newt = t + saved_seconds; 1411 if ((newt < t) != (saved_seconds < 0)) 1412 return WRONG; 1413 t = newt; 1414 (*funcp)(&t, offset, tmp); 1415 *okayp = TRUE; 1416 return t; 1417} 1418 1419static time_t 1420time1(tmp, funcp, offset) 1421struct tm * const tmp;
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1341void (* const funcp)();
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1422void (* const funcp) P((const time_t*, long, struct tm*)); |
1423const long offset; 1424{ 1425 register time_t t; 1426 register const struct state * sp; 1427 register int samei, otheri; 1428 int okay; 1429 1430 if (tmp->tm_isdst > 1) 1431 tmp->tm_isdst = 1; 1432 t = time2(tmp, funcp, offset, &okay); 1433#ifdef PCTS 1434 /* 1435 ** PCTS code courtesy Grant Sullivan (grant@osf.org). 1436 */ 1437 if (okay) 1438 return t; 1439 if (tmp->tm_isdst < 0) 1440 tmp->tm_isdst = 0; /* reset to std and try again */ 1441#endif /* defined PCTS */ 1442#ifndef PCTS 1443 if (okay || tmp->tm_isdst < 0) 1444 return t; 1445#endif /* !defined PCTS */ 1446 /* 1447 ** We're supposed to assume that somebody took a time of one type 1448 ** and did some math on it that yielded a "struct tm" that's bad. 1449 ** We try to divine the type they started from and adjust to the 1450 ** type they need. 1451 */ 1452 /* 1453 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1454 */ 1455 sp = (const struct state *) (((void *) funcp == (void *) localsub) ? 1456 lclptr : gmtptr); 1457#ifdef ALL_STATE 1458 if (sp == NULL) 1459 return WRONG; 1460#endif /* defined ALL_STATE */ 1461 for (samei = 0; samei < sp->typecnt; ++samei) { 1462 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 1463 continue; 1464 for (otheri = 0; otheri < sp->typecnt; ++otheri) { 1465 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 1466 continue; 1467 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - 1468 sp->ttis[samei].tt_gmtoff; 1469 tmp->tm_isdst = !tmp->tm_isdst; 1470 t = time2(tmp, funcp, offset, &okay); 1471 if (okay) 1472 return t; 1473 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - 1474 sp->ttis[samei].tt_gmtoff; 1475 tmp->tm_isdst = !tmp->tm_isdst; 1476 } 1477 } 1478 return WRONG; 1479} 1480 1481time_t 1482mktime(tmp) 1483struct tm * const tmp; 1484{
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1485 tzset(); |
1486 return time1(tmp, localsub, 0L); 1487} 1488 1489#ifdef STD_INSPIRED 1490 1491time_t 1492timelocal(tmp) 1493struct tm * const tmp; 1494{ 1495 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 1496 return mktime(tmp); 1497} 1498 1499time_t 1500timegm(tmp) 1501struct tm * const tmp; 1502{ 1503 tmp->tm_isdst = 0; 1504 return time1(tmp, gmtsub, 0L); 1505} 1506 1507time_t 1508timeoff(tmp, offset) 1509struct tm * const tmp; 1510const long offset; 1511{ 1512 tmp->tm_isdst = 0; 1513 return time1(tmp, gmtsub, offset); 1514} 1515 1516#endif /* defined STD_INSPIRED */ 1517 1518#ifdef CMUCS 1519 1520/* 1521** The following is supplied for compatibility with 1522** previous versions of the CMUCS runtime library. 1523*/ 1524 1525long 1526gtime(tmp) 1527struct tm * const tmp; 1528{ 1529 const time_t t = mktime(tmp); 1530 1531 if (t == WRONG) 1532 return -1; 1533 return t; 1534} 1535 1536#endif /* defined CMUCS */ 1537 1538/* 1539** XXX--is the below the right way to conditionalize?? 1540*/ 1541 1542#ifdef STD_INSPIRED 1543 1544/* 1545** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 1546** shall correspond to "Wed Dec 31 23:59:59 GMT 1986", which 1547** is not the case if we are accounting for leap seconds. 1548** So, we provide the following conversion routines for use 1549** when exchanging timestamps with POSIX conforming systems. 1550*/ 1551 1552static long 1553leapcorr(timep) 1554time_t * timep; 1555{ 1556 register struct state * sp; 1557 register struct lsinfo * lp; 1558 register int i; 1559
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1478 if (!lcl_is_set)
1479 (void) tzset();
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1560 sp = lclptr; 1561 i = sp->leapcnt; 1562 while (--i >= 0) { 1563 lp = &sp->lsis[i]; 1564 if (*timep >= lp->ls_trans) 1565 return lp->ls_corr; 1566 } 1567 return 0; 1568} 1569 1570time_t 1571time2posix(t) 1572time_t t; 1573{
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1574 tzset(); |
1575 return t - leapcorr(&t); 1576} 1577 1578time_t 1579posix2time(t) 1580time_t t; 1581{ 1582 time_t x; 1583 time_t y; 1584
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1585 tzset(); |
1586 /* 1587 ** For a positive leap second hit, the result 1588 ** is not unique. For a negative leap second 1589 ** hit, the corresponding time doesn't exist, 1590 ** so we return an adjacent second. 1591 */ 1592 x = t + leapcorr(&t); 1593 y = x - leapcorr(&x); 1594 if (y < t) { 1595 do { 1596 x++; 1597 y = x - leapcorr(&x); 1598 } while (y < t); 1599 if (t != y) 1600 return x - 1; 1601 } else if (y > t) { 1602 do { 1603 --x; 1604 y = x - leapcorr(&x); 1605 } while (y > t); 1606 if (t != y) 1607 return x + 1; 1608 } 1609 return x; 1610} 1611 1612#endif /* defined STD_INSPIRED */
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