diff options
Diffstat (limited to 'time/localtime.c')
| -rw-r--r-- | time/localtime.c | 1569 |
1 files changed, 0 insertions, 1569 deletions
diff --git a/time/localtime.c b/time/localtime.c deleted file mode 100644 index 1ae36fe9f..000000000 --- a/time/localtime.c +++ /dev/null @@ -1,1569 +0,0 @@ -#ifndef lint -#ifndef NOID -static char elsieid[] = "@(#)localtime.c 7.26"; -#endif /* !defined NOID */ -#endif /* !defined lint */ - -/* -** Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu). -** POSIX-style TZ environment variable handling from Guy Harris -** (guy@auspex.com). -*/ - -/*LINTLIBRARY*/ - -#include "private.h" -#include "tzfile.h" -#include "fcntl.h" - -#define ACCESS_MODE O_RDONLY - -#ifdef O_BINARY -#define OPEN_MODE (O_RDONLY | O_BINARY) -#endif /* defined O_BINARY */ -#ifndef O_BINARY -#define OPEN_MODE O_RDONLY -#endif /* !defined O_BINARY */ - -#ifndef WILDABBR -/* -** Someone might make incorrect use of a time zone abbreviation: -** 1. They might reference tzname[0] before calling tzset (explicitly -** or implicitly). -** 2. They might reference tzname[1] before calling tzset (explicitly -** or implicitly). -** 3. They might reference tzname[1] after setting to a time zone -** in which Daylight Saving Time is never observed. -** 4. They might reference tzname[0] after setting to a time zone -** in which Standard Time is never observed. -** 5. They might reference tm.TM_ZONE after calling offtime. -** What's best to do in the above cases is open to debate; -** for now, we just set things up so that in any of the five cases -** WILDABBR is used. Another possibility: initialize tzname[0] to the -** string "tzname[0] used before set", and similarly for the other cases. -** And another: initialize tzname[0] to "ERA", with an explanation in the -** manual page of what this "time zone abbreviation" means (doing this so -** that tzname[0] has the "normal" length of three characters). -*/ -#define WILDABBR " " -#endif /* !defined WILDABBR */ - -static char wildabbr[] = "WILDABBR"; - -static const char gmt[] = "GMT"; - -struct ttinfo { /* time type information */ - long tt_gmtoff; /* GMT offset in seconds */ - int tt_isdst; /* used to set tm_isdst */ - int tt_abbrind; /* abbreviation list index */ - int tt_ttisstd; /* TRUE if transition is std time */ -}; - -struct lsinfo { /* leap second information */ - time_t ls_trans; /* transition time */ - long ls_corr; /* correction to apply */ -}; - -#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) - -#ifdef TZNAME_MAX -#define MY_TZNAME_MAX TZNAME_MAX -#endif /* defined TZNAME_MAX */ -#ifndef TZNAME_MAX -#define MY_TZNAME_MAX 255 -#endif /* !defined TZNAME_MAX */ - -struct state { - int leapcnt; - int timecnt; - int typecnt; - int charcnt; - time_t ats[TZ_MAX_TIMES]; - unsigned char types[TZ_MAX_TIMES]; - struct ttinfo ttis[TZ_MAX_TYPES]; - char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), - (2 * (MY_TZNAME_MAX + 1)))]; - struct lsinfo lsis[TZ_MAX_LEAPS]; -}; - -struct rule { - int r_type; /* type of rule--see below */ - int r_day; /* day number of rule */ - int r_week; /* week number of rule */ - int r_mon; /* month number of rule */ - long r_time; /* transition time of rule */ -}; - -#define JULIAN_DAY 0 /* Jn - Julian day */ -#define DAY_OF_YEAR 1 /* n - day of year */ -#define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ - -/* -** Prototypes for static functions. -*/ - -static long detzcode P((const char * codep)); -static const char * getzname P((const char * strp)); -static const char * getnum P((const char * strp, int * nump, int min, - int max)); -static const char * getsecs P((const char * strp, long * secsp)); -static const char * getoffset P((const char * strp, long * offsetp)); -static const char * getrule P((const char * strp, struct rule * rulep)); -static void gmtload P((struct state * sp)); -static void gmtsub P((const time_t * timep, long offset, - struct tm * tmp)); -static void localsub P((const time_t * timep, long offset, - struct tm * tmp)); -static int increment_overflow P((int * number, int delta)); -static int normalize_overflow P((int * tensptr, int * unitsptr, - int base)); -static void settzname P((void)); -static time_t time1 P((struct tm * tmp, void (* funcp)(), - long offset)); -static time_t time2 P((struct tm *tmp, void (* funcp)(), - long offset, int * okayp)); -static void timesub P((const time_t * timep, long offset, - const struct state * sp, struct tm * tmp)); -static int tmcomp P((const struct tm * atmp, - const struct tm * btmp)); -static time_t transtime P((time_t janfirst, int year, - const struct rule * rulep, long offset)); -static int tzload P((const char * name, struct state * sp)); -static int tzparse P((const char * name, struct state * sp, - int lastditch)); - -#ifdef ALL_STATE -static struct state * lclptr; -static struct state * gmtptr; -#endif /* defined ALL_STATE */ - -#ifndef ALL_STATE -static struct state lclmem; -static struct state gmtmem; -#define lclptr (&lclmem) -#define gmtptr (&gmtmem) -#endif /* State Farm */ - -#ifndef TZ_STRLEN_MAX -#define TZ_STRLEN_MAX 255 -#endif - -static char lcl_TZname[TZ_STRLEN_MAX + 1]; -static int lcl_is_set; -static int gmt_is_set; - -char * tzname[2] = { - wildabbr, - wildabbr -}; - -/* -** Section 4.12.3 of X3.159-1989 requires that -** Except for the strftime function, these functions [asctime, -** ctime, gmtime, localtime] return values in one of two static -** objects: a broken-down time structure and an array of char. -** Thanks to Paul Eggert (eggert@twinsun.com) for noting this. -*/ - -static struct tm tm; - -#ifdef USG_COMPAT -time_t timezone = 0; -int daylight = 0; -#endif /* defined USG_COMPAT */ - -#ifdef ALTZONE -time_t altzone = 0; -#endif /* defined ALTZONE */ - -static long -detzcode(codep) -const char * const codep; -{ - register long result; - register int i; - - result = 0; - for (i = 0; i < 4; ++i) - result = (result << 8) | (codep[i] & 0xff); - return result; -} - -static void -settzname P((void)) -{ - register const struct state * const sp = lclptr; - register int i; - - tzname[0] = wildabbr; - tzname[1] = wildabbr; -#ifdef USG_COMPAT - daylight = 0; - timezone = 0; -#endif /* defined USG_COMPAT */ -#ifdef ALTZONE - altzone = 0; -#endif /* defined ALTZONE */ -#ifdef ALL_STATE - if (sp == NULL) { - tzname[0] = tzname[1] = gmt; - return; - } -#endif /* defined ALL_STATE */ - for (i = 0; i < sp->typecnt; ++i) { - register const struct ttinfo * const ttisp = &sp->ttis[i]; - - tzname[ttisp->tt_isdst] = - (char *) &sp->chars[ttisp->tt_abbrind]; -#ifdef USG_COMPAT - if (ttisp->tt_isdst) - daylight = 1; - if (i == 0 || !ttisp->tt_isdst) - timezone = -(ttisp->tt_gmtoff); -#endif /* defined USG_COMPAT */ -#ifdef ALTZONE - if (i == 0 || ttisp->tt_isdst) - altzone = -(ttisp->tt_gmtoff); -#endif /* defined ALTZONE */ - } - /* - ** And to get the latest zone names into tzname. . . - */ - for (i = 0; i < sp->timecnt; ++i) { - register const struct ttinfo * const ttisp = - &sp->ttis[ - sp->types[i]]; - - tzname[ttisp->tt_isdst] = - (char *) &sp->chars[ttisp->tt_abbrind]; - } -} - -static int -tzload(name, sp) -register const char * name; -register struct state * const sp; -{ - register const char * p; - register int i; - register int fid; - - if (name == NULL && (name = TZDEFAULT) == NULL) - return -1; - { - register int doaccess; - char fullname[FILENAME_MAX + 1]; - - if (name[0] == ':') - ++name; - doaccess = name[0] == '/'; - if (!doaccess) { - if ((p = TZDIR) == NULL) - return -1; - if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) - return -1; - (void) strcpy(fullname, p); - (void) strcat(fullname, "/"); - (void) strcat(fullname, name); - /* - ** Set doaccess if '.' (as in "../") shows up in name. - */ - if (strchr(name, '.') != NULL) - doaccess = TRUE; - name = fullname; - } - if (doaccess && access(name, ACCESS_MODE) != 0) - return -1; - if ((fid = open(name, OPEN_MODE)) == -1) - return -1; - } - { - register const struct tzhead * tzhp; - char buf[sizeof *sp + sizeof *tzhp]; - int ttisstdcnt; - - i = read(fid, buf, sizeof buf); - if (close(fid) != 0 || i < sizeof *tzhp) - return -1; - tzhp = (struct tzhead *) buf; - ttisstdcnt = (int) detzcode(tzhp->tzh_ttisstdcnt); - sp->leapcnt = (int) detzcode(tzhp->tzh_leapcnt); - sp->timecnt = (int) detzcode(tzhp->tzh_timecnt); - sp->typecnt = (int) detzcode(tzhp->tzh_typecnt); - sp->charcnt = (int) detzcode(tzhp->tzh_charcnt); - if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || - sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || - sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || - sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || - (ttisstdcnt != sp->typecnt && ttisstdcnt != 0)) - return -1; - if (i < sizeof *tzhp + - sp->timecnt * (4 + sizeof (char)) + - sp->typecnt * (4 + 2 * sizeof (char)) + - sp->charcnt * sizeof (char) + - sp->leapcnt * 2 * 4 + - ttisstdcnt * sizeof (char)) - return -1; - p = buf + sizeof *tzhp; - for (i = 0; i < sp->timecnt; ++i) { - sp->ats[i] = detzcode(p); - p += 4; - } - for (i = 0; i < sp->timecnt; ++i) { - sp->types[i] = (unsigned char) *p++; - if (sp->types[i] >= sp->typecnt) - return -1; - } - for (i = 0; i < sp->typecnt; ++i) { - register struct ttinfo * ttisp; - - ttisp = &sp->ttis[i]; - ttisp->tt_gmtoff = detzcode(p); - p += 4; - ttisp->tt_isdst = (unsigned char) *p++; - if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) - return -1; - ttisp->tt_abbrind = (unsigned char) *p++; - if (ttisp->tt_abbrind < 0 || - ttisp->tt_abbrind > sp->charcnt) - return -1; - } - for (i = 0; i < sp->charcnt; ++i) - sp->chars[i] = *p++; - sp->chars[i] = '\0'; /* ensure '\0' at end */ - for (i = 0; i < sp->leapcnt; ++i) { - register struct lsinfo * lsisp; - - lsisp = &sp->lsis[i]; - lsisp->ls_trans = detzcode(p); - p += 4; - lsisp->ls_corr = detzcode(p); - p += 4; - } - for (i = 0; i < sp->typecnt; ++i) { - register struct ttinfo * ttisp; - - ttisp = &sp->ttis[i]; - if (ttisstdcnt == 0) - ttisp->tt_ttisstd = FALSE; - else { - ttisp->tt_ttisstd = *p++; - if (ttisp->tt_ttisstd != TRUE && - ttisp->tt_ttisstd != FALSE) - return -1; - } - } - } - return 0; -} - -static const int mon_lengths[2][MONSPERYEAR] = { - { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, - { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } -}; - -static const int year_lengths[2] = { - DAYSPERNYEAR, DAYSPERLYEAR -}; - -/* -** Given a pointer into a time zone string, scan until a character that is not -** a valid character in a zone name is found. Return a pointer to that -** character. -*/ - -static const char * -getzname(strp) -register const char * strp; -{ - register char c; - - while ((c = *strp) != '\0' && !isdigit(c) && c != ',' && c != '-' && - c != '+') - ++strp; - return strp; -} - -/* -** Given a pointer into a time zone string, extract a number from that string. -** Check that the number is within a specified range; if it is not, return -** NULL. -** Otherwise, return a pointer to the first character not part of the number. -*/ - -static const char * -getnum(strp, nump, min, max) -register const char * strp; -int * const nump; -const int min; -const int max; -{ - register char c; - register int num; - - if (strp == NULL || !isdigit(*strp)) - return NULL; - num = 0; - while ((c = *strp) != '\0' && isdigit(c)) { - num = num * 10 + (c - '0'); - if (num > max) - return NULL; /* illegal value */ - ++strp; - } - if (num < min) - return NULL; /* illegal value */ - *nump = num; - return strp; -} - -/* -** Given a pointer into a time zone string, extract a number of seconds, -** in hh[:mm[:ss]] form, from the string. -** If any error occurs, return NULL. -** Otherwise, return a pointer to the first character not part of the number -** of seconds. -*/ - -static const char * -getsecs(strp, secsp) -register const char * strp; -long * const secsp; -{ - int num; - - /* - ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like - ** "M10.4.6/26", which does not conform to Posix, - ** but which specifies the equivalent of - ** ``02:00 on the first Sunday on or after 23 Oct''. - */ - strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); - if (strp == NULL) - return NULL; - *secsp = num * (long) SECSPERHOUR; - if (*strp == ':') { - ++strp; - strp = getnum(strp, &num, 0, MINSPERHOUR - 1); - if (strp == NULL) - return NULL; - *secsp += num * SECSPERMIN; - if (*strp == ':') { - ++strp; - /* `SECSPERMIN' allows for leap seconds. */ - strp = getnum(strp, &num, 0, SECSPERMIN); - if (strp == NULL) - return NULL; - *secsp += num; - } - } - return strp; -} - -/* -** Given a pointer into a time zone string, extract an offset, in -** [+-]hh[:mm[:ss]] form, from the string. -** If any error occurs, return NULL. -** Otherwise, return a pointer to the first character not part of the time. -*/ - -static const char * -getoffset(strp, offsetp) -register const char * strp; -long * const offsetp; -{ - register int neg; - - if (*strp == '-') { - neg = 1; - ++strp; - } else if (isdigit(*strp) || *strp++ == '+') - neg = 0; - else return NULL; /* illegal offset */ - strp = getsecs(strp, offsetp); - if (strp == NULL) - return NULL; /* illegal time */ - if (neg) - *offsetp = -*offsetp; - return strp; -} - -/* -** Given a pointer into a time zone string, extract a rule in the form -** date[/time]. See POSIX section 8 for the format of "date" and "time". -** If a valid rule is not found, return NULL. -** Otherwise, return a pointer to the first character not part of the rule. -*/ - -static const char * -getrule(strp, rulep) -const char * strp; -register struct rule * const rulep; -{ - if (*strp == 'J') { - /* - ** Julian day. - */ - rulep->r_type = JULIAN_DAY; - ++strp; - strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); - } else if (*strp == 'M') { - /* - ** Month, week, day. - */ - rulep->r_type = MONTH_NTH_DAY_OF_WEEK; - ++strp; - strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); - if (strp == NULL) - return NULL; - if (*strp++ != '.') - return NULL; - strp = getnum(strp, &rulep->r_week, 1, 5); - if (strp == NULL) - return NULL; - if (*strp++ != '.') - return NULL; - strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); - } else if (isdigit(*strp)) { - /* - ** Day of year. - */ - rulep->r_type = DAY_OF_YEAR; - strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); - } else return NULL; /* invalid format */ - if (strp == NULL) - return NULL; - if (*strp == '/') { - /* - ** Time specified. - */ - ++strp; - strp = getsecs(strp, &rulep->r_time); - } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ - return strp; -} - -/* -** Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the -** year, a rule, and the offset from GMT at the time that rule takes effect, -** calculate the Epoch-relative time that rule takes effect. -*/ - -static time_t -transtime(janfirst, year, rulep, offset) -const time_t janfirst; -const int year; -register const struct rule * const rulep; -const long offset; -{ - register int leapyear; - register time_t value; - register int i; - int d, m1, yy0, yy1, yy2, dow; - - INITIALIZE(value); - leapyear = isleap(year); - switch (rulep->r_type) { - - case JULIAN_DAY: - /* - ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap - ** years. - ** In non-leap years, or if the day number is 59 or less, just - ** add SECSPERDAY times the day number-1 to the time of - ** January 1, midnight, to get the day. - */ - value = janfirst + (rulep->r_day - 1) * SECSPERDAY; - if (leapyear && rulep->r_day >= 60) - value += SECSPERDAY; - break; - - case DAY_OF_YEAR: - /* - ** n - day of year. - ** Just add SECSPERDAY times the day number to the time of - ** January 1, midnight, to get the day. - */ - value = janfirst + rulep->r_day * SECSPERDAY; - break; - - case MONTH_NTH_DAY_OF_WEEK: - /* - ** Mm.n.d - nth "dth day" of month m. - */ - value = janfirst; - for (i = 0; i < rulep->r_mon - 1; ++i) - value += mon_lengths[leapyear][i] * SECSPERDAY; - - /* - ** Use Zeller's Congruence to get day-of-week of first day of - ** month. - */ - m1 = (rulep->r_mon + 9) % 12 + 1; - yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; - yy1 = yy0 / 100; - yy2 = yy0 % 100; - dow = ((26 * m1 - 2) / 10 + - 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; - if (dow < 0) - dow += DAYSPERWEEK; - - /* - ** "dow" is the day-of-week of the first day of the month. Get - ** the day-of-month (zero-origin) of the first "dow" day of the - ** month. - */ - d = rulep->r_day - dow; - if (d < 0) - d += DAYSPERWEEK; - for (i = 1; i < rulep->r_week; ++i) { - if (d + DAYSPERWEEK >= - mon_lengths[leapyear][rulep->r_mon - 1]) - break; - d += DAYSPERWEEK; - } - - /* - ** "d" is the day-of-month (zero-origin) of the day we want. - */ - value += d * SECSPERDAY; - break; - } - - /* - ** "value" is the Epoch-relative time of 00:00:00 GMT on the day in - ** question. To get the Epoch-relative time of the specified local - ** time on that day, add the transition time and the current offset - ** from GMT. - */ - return value + rulep->r_time + offset; -} - -/* -** Given a POSIX section 8-style TZ string, fill in the rule tables as -** appropriate. -*/ - -static int -tzparse(name, sp, lastditch) -const char * name; -register struct state * const sp; -const int lastditch; -{ - const char * stdname; - const char * dstname; - size_t stdlen; - size_t dstlen; - long stdoffset; - long dstoffset; - register time_t * atp; - register unsigned char * typep; - register char * cp; - register int load_result; - - INITIALIZE(dstname); - stdname = name; - if (lastditch) { - stdlen = strlen(name); /* length of standard zone name */ - name += stdlen; - if (stdlen >= sizeof sp->chars) - stdlen = (sizeof sp->chars) - 1; - } else { - name = getzname(name); - stdlen = name - stdname; - if (stdlen < 3) - return -1; - } - if (*name == '\0') - return -1; /* was "stdoffset = 0;" */ - else { - name = getoffset(name, &stdoffset); - if (name == NULL) - return -1; - } - load_result = tzload(TZDEFRULES, sp); - if (load_result != 0) - sp->leapcnt = 0; /* so, we're off a little */ - if (*name != '\0') { - dstname = name; - name = getzname(name); - dstlen = name - dstname; /* length of DST zone name */ - if (dstlen < 3) - return -1; - if (*name != '\0' && *name != ',' && *name != ';') { - name = getoffset(name, &dstoffset); - if (name == NULL) - return -1; - } else dstoffset = stdoffset - SECSPERHOUR; - if (*name == ',' || *name == ';') { - struct rule start; - struct rule end; - register int year; - register time_t janfirst; - time_t starttime; - time_t endtime; - - ++name; - if ((name = getrule(name, &start)) == NULL) - return -1; - if (*name++ != ',') - return -1; - if ((name = getrule(name, &end)) == NULL) - return -1; - if (*name != '\0') - return -1; - sp->typecnt = 2; /* standard time and DST */ - /* - ** Two transitions per year, from EPOCH_YEAR to 2037. - */ - sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); - if (sp->timecnt > TZ_MAX_TIMES) - return -1; - sp->ttis[0].tt_gmtoff = -dstoffset; - sp->ttis[0].tt_isdst = 1; - sp->ttis[0].tt_abbrind = stdlen + 1; - sp->ttis[1].tt_gmtoff = -stdoffset; - sp->ttis[1].tt_isdst = 0; - sp->ttis[1].tt_abbrind = 0; - atp = sp->ats; - typep = sp->types; - janfirst = 0; - for (year = EPOCH_YEAR; year <= 2037; ++year) { - starttime = transtime(janfirst, year, &start, - stdoffset); - endtime = transtime(janfirst, year, &end, - dstoffset); - if (starttime > endtime) { - *atp++ = endtime; - *typep++ = 1; /* DST ends */ - *atp++ = starttime; - *typep++ = 0; /* DST begins */ - } else { - *atp++ = starttime; - *typep++ = 0; /* DST begins */ - *atp++ = endtime; - *typep++ = 1; /* DST ends */ - } - janfirst += year_lengths[isleap(year)] * - SECSPERDAY; - } - } else { - int sawstd; - int sawdst; - long stdfix; - long dstfix; - long oldfix; - int isdst; - register int i; - - if (*name != '\0') - return -1; - if (load_result != 0) - return -1; - /* - ** Compute the difference between the real and - ** prototype standard and summer time offsets - ** from GMT, and put the real standard and summer - ** time offsets into the rules in place of the - ** prototype offsets. - */ - sawstd = FALSE; - sawdst = FALSE; - stdfix = 0; - dstfix = 0; - for (i = 0; i < sp->typecnt; ++i) { - if (sp->ttis[i].tt_isdst) { - oldfix = dstfix; - dstfix = sp->ttis[i].tt_gmtoff + - dstoffset; - if (sawdst && (oldfix != dstfix)) - return -1; - sp->ttis[i].tt_gmtoff = -dstoffset; - sp->ttis[i].tt_abbrind = stdlen + 1; - sawdst = TRUE; - } else { - oldfix = stdfix; - stdfix = sp->ttis[i].tt_gmtoff + - stdoffset; - if (sawstd && (oldfix != stdfix)) - return -1; - sp->ttis[i].tt_gmtoff = -stdoffset; - sp->ttis[i].tt_abbrind = 0; - sawstd = TRUE; - } - } - /* - ** Make sure we have both standard and summer time. - */ - if (!sawdst || !sawstd) - return -1; - /* - ** Now correct the transition times by shifting - ** them by the difference between the real and - ** prototype offsets. Note that this difference - ** can be different in standard and summer time; - ** the prototype probably has a 1-hour difference - ** between standard and summer time, but a different - ** difference can be specified in TZ. - */ - isdst = FALSE; /* we start in standard time */ - for (i = 0; i < sp->timecnt; ++i) { - register const struct ttinfo * ttisp; - - /* - ** If summer time is in effect, and the - ** transition time was not specified as - ** standard time, add the summer time - ** offset to the transition time; - ** otherwise, add the standard time offset - ** to the transition time. - */ - ttisp = &sp->ttis[sp->types[i]]; - sp->ats[i] += - (isdst && !ttisp->tt_ttisstd) ? - dstfix : stdfix; - isdst = ttisp->tt_isdst; - } - } - } else { - dstlen = 0; - sp->typecnt = 1; /* only standard time */ - sp->timecnt = 0; - sp->ttis[0].tt_gmtoff = -stdoffset; - sp->ttis[0].tt_isdst = 0; - sp->ttis[0].tt_abbrind = 0; - } - sp->charcnt = stdlen + 1; - if (dstlen != 0) - sp->charcnt += dstlen + 1; - if (sp->charcnt > sizeof sp->chars) - return -1; - cp = sp->chars; - (void) strncpy(cp, stdname, stdlen); - cp += stdlen; - *cp++ = '\0'; - if (dstlen != 0) { - (void) strncpy(cp, dstname, dstlen); - *(cp + dstlen) = '\0'; - } - return 0; -} - -static void -gmtload(sp) -struct state * const sp; -{ - if (tzload(gmt, sp) != 0) - (void) tzparse(gmt, sp, TRUE); -} - -#ifndef STD_INSPIRED -/* -** A non-static declaration of tzsetwall in a system header file -** may cause a warning about this upcoming static declaration... -*/ -static -#endif /* !defined STD_INSPIRED */ -void -tzsetwall P((void)) -{ - if (lcl_is_set < 0) - return; - lcl_is_set = -1; - -#ifdef ALL_STATE - if (lclptr == NULL) { - lclptr = (struct state *) malloc(sizeof *lclptr); - if (lclptr == NULL) { - settzname(); /* all we can do */ - return; - } - } -#endif /* defined ALL_STATE */ - if (tzload((char *) NULL, lclptr) != 0) - gmtload(lclptr); - settzname(); -} - -void -tzset P((void)) -{ - register const char * name; - - name = getenv("TZ"); - if (name == NULL) { - tzsetwall(); - return; - } - - if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) - return; - lcl_is_set = (strlen(name) < sizeof(lcl_TZname)); - if (lcl_is_set) - (void) strcpy(lcl_TZname, name); - -#ifdef ALL_STATE - if (lclptr == NULL) { - lclptr = (struct state *) malloc(sizeof *lclptr); - if (lclptr == NULL) { - settzname(); /* all we can do */ - return; - } - } -#endif /* defined ALL_STATE */ - if (*name == '\0') { - /* - ** User wants it fast rather than right. - */ - lclptr->leapcnt = 0; /* so, we're off a little */ - lclptr->timecnt = 0; - lclptr->ttis[0].tt_gmtoff = 0; - lclptr->ttis[0].tt_abbrind = 0; - (void) strcpy(lclptr->chars, gmt); - } else if (tzload(name, lclptr) != 0) - if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) - (void) gmtload(lclptr); - settzname(); -} - -/* -** The easy way to behave "as if no library function calls" localtime -** is to not call it--so we drop its guts into "localsub", which can be -** freely called. (And no, the PANS doesn't require the above behavior-- -** but it *is* desirable.) -** -** The unused offset argument is for the benefit of mktime variants. -*/ - -/*ARGSUSED*/ -static void -localsub(timep, offset, tmp) -const time_t * const timep; -const long offset; -struct tm * const tmp; -{ - register const struct state * sp; - register const struct ttinfo * ttisp; - register int i; - const time_t t = *timep; - - sp = lclptr; -#ifdef ALL_STATE - if (sp == NULL) { - gmtsub(timep, offset, tmp); - return; - } -#endif /* defined ALL_STATE */ - if (sp->timecnt == 0 || t < sp->ats[0]) { - i = 0; - while (sp->ttis[i].tt_isdst) - if (++i >= sp->typecnt) { - i = 0; - break; - } - } else { - for (i = 1; i < sp->timecnt; ++i) - if (t < sp->ats[i]) - break; - i = sp->types[i - 1]; - } - ttisp = &sp->ttis[i]; - /* - ** To get (wrong) behavior that's compatible with System V Release 2.0 - ** you'd replace the statement below with - ** t += ttisp->tt_gmtoff; - ** timesub(&t, 0L, sp, tmp); - */ - timesub(&t, ttisp->tt_gmtoff, sp, tmp); - tmp->tm_isdst = ttisp->tt_isdst; - tzname[tmp->tm_isdst] = (char *) &sp->chars[ttisp->tt_abbrind]; -#ifdef TM_ZONE - tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; -#endif /* defined TM_ZONE */ -} - -struct tm * -localtime(timep) -const time_t * const timep; -{ - tzset(); - localsub(timep, 0L, &tm); - return &tm; -} - -/* -** gmtsub is to gmtime as localsub is to localtime. -*/ - -static void -gmtsub(timep, offset, tmp) -const time_t * const timep; -const long offset; -struct tm * const tmp; -{ - if (!gmt_is_set) { - gmt_is_set = TRUE; -#ifdef ALL_STATE - gmtptr = (struct state *) malloc(sizeof *gmtptr); - if (gmtptr != NULL) -#endif /* defined ALL_STATE */ - gmtload(gmtptr); - } - timesub(timep, offset, gmtptr, tmp); -#ifdef TM_ZONE - /* - ** Could get fancy here and deliver something such as - ** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero, - ** but this is no time for a treasure hunt. - */ - if (offset != 0) - tmp->TM_ZONE = wildabbr; - else { -#ifdef ALL_STATE - if (gmtptr == NULL) - tmp->TM_ZONE = gmt; - else tmp->TM_ZONE = gmtptr->chars; -#endif /* defined ALL_STATE */ -#ifndef ALL_STATE - tmp->TM_ZONE = gmtptr->chars; -#endif /* State Farm */ - } -#endif /* defined TM_ZONE */ -} - -struct tm * -gmtime(timep) -const time_t * const timep; -{ - gmtsub(timep, 0L, &tm); - return &tm; -} - -#ifdef STD_INSPIRED - -struct tm * -offtime(timep, offset) -const time_t * const timep; -const long offset; -{ - gmtsub(timep, offset, &tm); - return &tm; -} - -#endif /* defined STD_INSPIRED */ - -static void -timesub(timep, offset, sp, tmp) -const time_t * const timep; -const long offset; -register const struct state * const sp; -register struct tm * const tmp; -{ - register const struct lsinfo * lp; - register long days; - register long rem; - register int y; - register int yleap; - register const int * ip; - register long corr; - register int hit; - register int i; - - corr = 0; - hit = 0; -#ifdef ALL_STATE - i = (sp == NULL) ? 0 : sp->leapcnt; -#endif /* defined ALL_STATE */ -#ifndef ALL_STATE - i = sp->leapcnt; -#endif /* State Farm */ - while (--i >= 0) { - lp = &sp->lsis[i]; - if (*timep >= lp->ls_trans) { - if (*timep == lp->ls_trans) { - hit = ((i == 0 && lp->ls_corr > 0) || - lp->ls_corr > sp->lsis[i - 1].ls_corr); - if (hit) - while (i > 0 && - sp->lsis[i].ls_trans == - sp->lsis[i - 1].ls_trans + 1 && - sp->lsis[i].ls_corr == - sp->lsis[i - 1].ls_corr + 1) { - ++hit; - --i; - } - } - corr = lp->ls_corr; - break; - } - } - days = *timep / SECSPERDAY; - rem = *timep % SECSPERDAY; -#ifdef mc68k - if (*timep == 0x80000000) { - /* - ** A 3B1 muffs the division on the most negative number. - */ - days = -24855; - rem = -11648; - } -#endif /* mc68k */ - rem += (offset - corr); - while (rem < 0) { - rem += SECSPERDAY; - --days; - } - while (rem >= SECSPERDAY) { - rem -= SECSPERDAY; - ++days; - } - tmp->tm_hour = (int) (rem / SECSPERHOUR); - rem = rem % SECSPERHOUR; - tmp->tm_min = (int) (rem / SECSPERMIN); - tmp->tm_sec = (int) (rem % SECSPERMIN); - if (hit) - /* - ** A positive leap second requires a special - ** representation. This uses "... ??:59:60" et seq. - */ - tmp->tm_sec += hit; - tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); - if (tmp->tm_wday < 0) - tmp->tm_wday += DAYSPERWEEK; - y = EPOCH_YEAR; - if (days >= 0) - for ( ; ; ) { - yleap = isleap(y); - if (days < (long) year_lengths[yleap]) - break; - ++y; - days = days - (long) year_lengths[yleap]; - } - else do { - --y; - yleap = isleap(y); - days = days + (long) year_lengths[yleap]; - } while (days < 0); - tmp->tm_year = y - TM_YEAR_BASE; - tmp->tm_yday = (int) days; - ip = mon_lengths[yleap]; - for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) - days = days - (long) ip[tmp->tm_mon]; - tmp->tm_mday = (int) (days + 1); - tmp->tm_isdst = 0; -#ifdef TM_GMTOFF - tmp->TM_GMTOFF = offset; -#endif /* defined TM_GMTOFF */ -} - -char * -ctime(timep) -const time_t * const timep; -{ -/* -** Section 4.12.3.2 of X3.159-1989 requires that -** The ctime funciton converts the calendar time pointed to by timer -** to local time in the form of a string. It is equivalent to -** asctime(localtime(timer)) -*/ - return asctime(localtime(timep)); -} - -/* -** Adapted from code provided by Robert Elz, who writes: -** The "best" way to do mktime I think is based on an idea of Bob -** Kridle's (so its said...) from a long time ago. (mtxinu!kridle now). -** It does a binary search of the time_t space. Since time_t's are -** just 32 bits, its a max of 32 iterations (even at 64 bits it -** would still be very reasonable). -*/ - -#ifndef WRONG -#define WRONG (-1) -#endif /* !defined WRONG */ - -/* -** Simplified normalize logic courtesy Paul Eggert (eggert@twinsun.com). -*/ - -static int -increment_overflow(number, delta) -int * number; -int delta; -{ - int number0; - - number0 = *number; - *number += delta; - return (*number < number0) != (delta < 0); -} - -static int -normalize_overflow(tensptr, unitsptr, base) -int * const tensptr; -int * const unitsptr; -const int base; -{ - register int tensdelta; - - tensdelta = (*unitsptr >= 0) ? - (*unitsptr / base) : - (-1 - (-1 - *unitsptr) / base); - *unitsptr -= tensdelta * base; - return increment_overflow(tensptr, tensdelta); -} - -static int -tmcomp(atmp, btmp) -register const struct tm * const atmp; -register const struct tm * const btmp; -{ - register int result; - - if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && - (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && - (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && - (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && - (result = (atmp->tm_min - btmp->tm_min)) == 0) - result = atmp->tm_sec - btmp->tm_sec; - return result; -} - -static time_t -time2(tmp, funcp, offset, okayp) -struct tm * const tmp; -void (* const funcp)(); -const long offset; -int * const okayp; -{ - register const struct state * sp; - register int dir; - register int bits; - register int i, j ; - register int saved_seconds; - time_t newt; - time_t t; - struct tm yourtm, mytm; - - *okayp = FALSE; - yourtm = *tmp; - if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) - return WRONG; - if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) - return WRONG; - if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) - return WRONG; - /* - ** Turn yourtm.tm_year into an actual year number for now. - ** It is converted back to an offset from TM_YEAR_BASE later. - */ - if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) - return WRONG; - while (yourtm.tm_mday <= 0) { - if (increment_overflow(&yourtm.tm_year, -1)) - return WRONG; - yourtm.tm_mday += year_lengths[isleap(yourtm.tm_year)]; - } - while (yourtm.tm_mday > DAYSPERLYEAR) { - yourtm.tm_mday -= year_lengths[isleap(yourtm.tm_year)]; - if (increment_overflow(&yourtm.tm_year, 1)) - return WRONG; - } - for ( ; ; ) { - i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; - if (yourtm.tm_mday <= i) - break; - yourtm.tm_mday -= i; - if (++yourtm.tm_mon >= MONSPERYEAR) { - yourtm.tm_mon = 0; - if (increment_overflow(&yourtm.tm_year, 1)) - return WRONG; - } - } - if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) - return WRONG; - if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { - /* - ** We can't set tm_sec to 0, because that might push the - ** time below the minimum representable time. - ** Set tm_sec to 59 instead. - ** This assumes that the minimum representable time is - ** not in the same minute that a leap second was deleted from, - ** which is a safer assumption than using 58 would be. - */ - if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) - return WRONG; - saved_seconds = yourtm.tm_sec; - yourtm.tm_sec = SECSPERMIN - 1; - } else { - saved_seconds = yourtm.tm_sec; - yourtm.tm_sec = 0; - } - /* - ** Calculate the number of magnitude bits in a time_t - ** (this works regardless of whether time_t is - ** signed or unsigned, though lint complains if unsigned). - */ - for (bits = 0, t = 1; t > 0; ++bits, t <<= 1) - continue; - /* - ** If time_t is signed, then 0 is the median value, - ** if time_t is unsigned, then 1 << bits is median. - */ - t = (t < 0) ? 0 : ((time_t) 1 << bits); - for ( ; ; ) { - (*funcp)(&t, offset, &mytm); - dir = tmcomp(&mytm, &yourtm); - if (dir != 0) { - if (bits-- < 0) - return WRONG; - if (bits < 0) - --t; - else if (dir > 0) - t -= (time_t) 1 << bits; - else t += (time_t) 1 << bits; - continue; - } - if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) - break; - /* - ** Right time, wrong type. - ** Hunt for right time, right type. - ** It's okay to guess wrong since the guess - ** gets checked. - */ - /* - ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. - */ - sp = (const struct state *) - (((void *) funcp == (void *) localsub) ? - lclptr : gmtptr); -#ifdef ALL_STATE - if (sp == NULL) - return WRONG; -#endif /* defined ALL_STATE */ - for (i = 0; i < sp->typecnt; ++i) { - if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) - continue; - for (j = 0; j < sp->typecnt; ++j) { - if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) - continue; - newt = t + sp->ttis[j].tt_gmtoff - - sp->ttis[i].tt_gmtoff; - (*funcp)(&newt, offset, &mytm); - if (tmcomp(&mytm, &yourtm) != 0) - continue; - if (mytm.tm_isdst != yourtm.tm_isdst) - continue; - /* - ** We have a match. - */ - t = newt; - goto label; - } - } - return WRONG; - } -label: - newt = t + saved_seconds; - if ((newt < t) != (saved_seconds < 0)) - return WRONG; - t = newt; - (*funcp)(&t, offset, tmp); - *okayp = TRUE; - return t; -} - -static time_t -time1(tmp, funcp, offset) -struct tm * const tmp; -void (* const funcp)(); -const long offset; -{ - register time_t t; - register const struct state * sp; - register int samei, otheri; - int okay; - - if (tmp->tm_isdst > 1) - tmp->tm_isdst = 1; - t = time2(tmp, funcp, offset, &okay); -#ifdef PCTS - /* - ** PCTS code courtesy Grant Sullivan (grant@osf.org). - */ - if (okay) - return t; - if (tmp->tm_isdst < 0) - tmp->tm_isdst = 0; /* reset to std and try again */ -#endif /* defined PCTS */ -#ifndef PCTS - if (okay || tmp->tm_isdst < 0) - return t; -#endif /* !defined PCTS */ - /* - ** We're supposed to assume that somebody took a time of one type - ** and did some math on it that yielded a "struct tm" that's bad. - ** We try to divine the type they started from and adjust to the - ** type they need. - */ - /* - ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. - */ - sp = (const struct state *) (((void *) funcp == (void *) localsub) ? - lclptr : gmtptr); -#ifdef ALL_STATE - if (sp == NULL) - return WRONG; -#endif /* defined ALL_STATE */ - for (samei = 0; samei < sp->typecnt; ++samei) { - if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) - continue; - for (otheri = 0; otheri < sp->typecnt; ++otheri) { - if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) - continue; - tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - - sp->ttis[samei].tt_gmtoff; - tmp->tm_isdst = !tmp->tm_isdst; - t = time2(tmp, funcp, offset, &okay); - if (okay) - return t; - tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - - sp->ttis[samei].tt_gmtoff; - tmp->tm_isdst = !tmp->tm_isdst; - } - } - return WRONG; -} - -time_t -mktime(tmp) -struct tm * const tmp; -{ - tzset(); - return time1(tmp, localsub, 0L); -} - -#ifdef STD_INSPIRED - -time_t -timelocal(tmp) -struct tm * const tmp; -{ - tmp->tm_isdst = -1; /* in case it wasn't initialized */ - return mktime(tmp); -} - -time_t -timegm(tmp) -struct tm * const tmp; -{ - tmp->tm_isdst = 0; - return time1(tmp, gmtsub, 0L); -} - -time_t -timeoff(tmp, offset) -struct tm * const tmp; -const long offset; -{ - tmp->tm_isdst = 0; - return time1(tmp, gmtsub, offset); -} - -#endif /* defined STD_INSPIRED */ - -#ifdef CMUCS - -/* -** The following is supplied for compatibility with -** previous versions of the CMUCS runtime library. -*/ - -long -gtime(tmp) -struct tm * const tmp; -{ - const time_t t = mktime(tmp); - - if (t == WRONG) - return -1; - return t; -} - -#endif /* defined CMUCS */ - -/* -** XXX--is the below the right way to conditionalize?? -*/ - -#ifdef STD_INSPIRED - -/* -** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 -** shall correspond to "Wed Dec 31 23:59:59 GMT 1986", which -** is not the case if we are accounting for leap seconds. -** So, we provide the following conversion routines for use -** when exchanging timestamps with POSIX conforming systems. -*/ - -static long -leapcorr(timep) -time_t * timep; -{ - register struct state * sp; - register struct lsinfo * lp; - register int i; - - sp = lclptr; - i = sp->leapcnt; - while (--i >= 0) { - lp = &sp->lsis[i]; - if (*timep >= lp->ls_trans) - return lp->ls_corr; - } - return 0; -} - -time_t -time2posix(t) -time_t t; -{ - tzset(); - return t - leapcorr(&t); -} - -time_t -posix2time(t) -time_t t; -{ - time_t x; - time_t y; - - tzset(); - /* - ** For a positive leap second hit, the result - ** is not unique. For a negative leap second - ** hit, the corresponding time doesn't exist, - ** so we return an adjacent second. - */ - x = t + leapcorr(&t); - y = x - leapcorr(&x); - if (y < t) { - do { - x++; - y = x - leapcorr(&x); - } while (y < t); - if (t != y) - return x - 1; - } else if (y > t) { - do { - --x; - y = x - leapcorr(&x); - } while (y > t); - if (t != y) - return x + 1; - } - return x; -} - -#endif /* defined STD_INSPIRED */ |