ctime.c
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上传日期:2007-04-14
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- /*
- * Copyright (c) 1987, 1989 Regents of the University of California.
- * Copyright (c) 1994 Chris Provenzano, proven@mit.edu
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Arthur David Olson of the National Cancer Institute.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)ctime.c 5.26 (Berkeley) 2/23/91";
- #endif /* LIBC_SCCS and not 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 "config.h"
- #include <pthread.h>
- #include <sys/param.h>
- #include <fcntl.h>
- #include <time.h>
- #include <tzfile.h>
- #include <string.h>
- #include <ctype.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <stdlib.h>
- #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 */
- #ifndef TRUE
- #define TRUE 1
- #define FALSE 0
- #endif /* !defined TRUE */
- 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 */
- };
- 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[(TZ_MAX_CHARS + 1 > sizeof GMT) ?
- TZ_MAX_CHARS + 1 : sizeof GMT];
- 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 int detzcode __P_((const char *));
- static const char * getnum __P_((const char *, int *, int, int));
- static const char * getsecs __P_((const char *, long *));
- static const char * getoffset __P_((const char *, long *));
- static const char * getrule __P_((const char *, struct rule *));
- static const char * getzname __P_((const char *));
- static void gmtload __P_((struct state *));
- static void gmtsub __P_((const time_t *, long, struct tm *));
- static void localsub __P_((const time_t *, long, struct tm *));
- static void normalize __P_((int *, int *, int));
- static void settzname __P_((struct state *));
- static time_t time1 __P_((struct tm *, long));
- static time_t time2 __P_((struct tm *, long, int *));
- static void timesub __P_((const time_t *, long, const struct state *,
- struct tm *));
- static int tmcomp __P_((const struct tm *, const struct tm *));
- static time_t transtime __P_((time_t, int, const struct rule *, long));
- static int tzload __P_((const char *, struct state *));
- static int tzparse __P_((const char *, struct state *, int));
- static void tzset_basic __P_((void));
- static void tzsetwall_basic __P_((void));
- static pthread_mutex_t lcl_mutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_mutex_t gmt_mutex = PTHREAD_MUTEX_INITIALIZER;
- static int lcl_is_set = FALSE;
- static int gmt_is_set = FALSE;
- static struct state lclmem;
- static struct state gmtmem;
- #define lclptr (&lclmem)
- #define gmtptr (&gmtmem)
- char * tzname[2] = {
- WILDABBR,
- WILDABBR
- };
- #ifdef USG_COMPAT
- time_t timezone = 0;
- int daylight = 0;
- #endif /* defined USG_COMPAT */
- #ifdef ALTZONE
- time_t altzone = 0;
- #endif /* defined ALTZONE */
- static int detzcode(const char * codep)
- {
- long result;
- int i;
- result = 0;
- for (i = 0; i < 4; ++i)
- result = (result << 8) | (codep[i] & 0xff);
- return result;
- }
- static void settzname(struct state * sp)
- {
- 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 */
- 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(const char * name, struct state * sp)
- {
- register const char * p;
- register int i;
- register int fid;
- if (name == NULL && (name = TZDEFAULT) == NULL)
- return -1;
- {
- char fullname[FILENAME_MAX + 1];
- if (name[0] == ':')
- ++name;
- if (name[0] != '/') {
- 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);
- name = fullname;
- }
- if ((fid = open(name, O_RDONLY)) == -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] = ' '; /* ensure ' ' 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(const char * strp)
- {
- register char c;
- while ((c = *strp) != ' ' && !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(const char * strp, int * nump, int min, int max)
- {
- char c;
- int num;
- if (strp == NULL || !isdigit(*strp))
- return NULL;
- num = 0;
- while ((c = *strp) != ' ' && 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(const char * strp, long * secsp)
- {
- int num;
- strp = getnum(strp, &num, 0, HOURSPERDAY);
- if (strp == NULL)
- return NULL;
- *secsp = num * SECSPERHOUR;
- if (*strp == ':') {
- ++strp;
- strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
- if (strp == NULL)
- return NULL;
- *secsp += num * SECSPERMIN;
- if (*strp == ':') {
- ++strp;
- strp = getnum(strp, &num, 0, SECSPERMIN - 1);
- 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(const char * strp, long * offsetp)
- {
- 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(const char * strp, struct rule * 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(time_t janfirst, int year,
- const struct rule * rulep, long offset)
- {
- register int leapyear;
- register time_t value;
- register int i;
- int d, m1, yy0, yy1, yy2, dow;
- 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(const char * name, struct state * sp, int lastditch)
- {
- const char * stdname;
- const char * dstname;
- int stdlen;
- int dstlen;
- long stdoffset;
- long dstoffset;
- register time_t * atp;
- register unsigned char * typep;
- register char * cp;
- register int load_result;
- 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 == ' ')
- return -1;
- 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 != ' ') {
- dstname = name;
- name = getzname(name);
- dstlen = name - dstname; /* length of DST zone name */
- if (dstlen < 3)
- return -1;
- if (*name != ' ' && *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 != ' ')
- 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 != ' ')
- 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++ = ' ';
- if (dstlen != 0) {
- (void) strncpy(cp, dstname, dstlen);
- *(cp + dstlen) = ' ';
- }
- return 0;
- }
- static void gmtload(struct state * sp)
- {
- if (tzload(GMT, sp) != 0)
- (void) tzparse(GMT, sp, TRUE);
- }
- static void tzset_basic()
- {
- const char * name;
- if ((name = getenv("TZ")) == NULL) {
- tzsetwall_basic();
- return;
- }
- if (*name == ' ') {
- /*
- ** 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);
- }
- lcl_is_set = TRUE;
- settzname(lclptr);
- }
- void tzset()
- {
- pthread_mutex_lock(&lcl_mutex);
- tzset_basic();
- pthread_mutex_unlock(&lcl_mutex);
- }
- static void tzsetwall_basic()
- {
- if (tzload((char *) NULL, lclptr) != 0)
- gmtload(lclptr);
- settzname(lclptr);
- lcl_is_set = TRUE;
- }
- void tzsetwall()
- {
- pthread_mutex_lock(&lcl_mutex);
- tzsetwall_basic();
- pthread_mutex_unlock(&lcl_mutex);
- }
- /*
- ** 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.
- */
- static void localsub(const time_t * timep, long offset, struct tm * tmp)
- {
- const struct ttinfo * ttisp;
- const time_t t = *timep;
- struct state * sp;
- int i;
- if (!lcl_is_set)
- tzset_basic();
- sp = lclptr;
- 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);
- tzname[tmp->tm_isdst] = (char *) &sp->chars[ttisp->tt_abbrind];
- #ifdef BSD_TM
- tmp->tm_zone = &sp->chars[ttisp->tt_abbrind];
- #endif
- tmp->tm_isdst = ttisp->tt_isdst;
- pthread_mutex_unlock(&lcl_mutex);
- }
- struct tm * localtime_r(const time_t * timep, struct tm * tm)
- {
- pthread_mutex_lock(&lcl_mutex);
- localsub(timep, 0L, tm);
- pthread_mutex_unlock(&lcl_mutex);
- return(tm);
- }
- struct tm * localtime(const time_t * timep)
- {
- static pthread_mutex_t localtime_mutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_key_t localtime_key = -1;
- struct tm * tm;
- pthread_mutex_lock(&localtime_mutex);
- if (localtime_key < 0) {
- if (pthread_key_create(&localtime_key, free) < 0) {
- pthread_mutex_unlock(&localtime_mutex);
- return(NULL);
- }
- }
- pthread_mutex_unlock(&localtime_mutex);
- if ((tm = pthread_getspecific(localtime_key)) == NULL) {
- if ((tm = (struct tm *)malloc(sizeof(struct tm))) == NULL) {
- return(NULL);
- }
- pthread_setspecific(localtime_key, tm);
- }
- pthread_mutex_lock(&lcl_mutex);
- localsub(timep, 0L, tm);
- pthread_mutex_unlock(&lcl_mutex);
- return tm;
- }
- /*
- * gmtsub is to gmtime as localsub is to localtime.
- *
- * Once set there is no need to lock the gmt_mutex to view gmtptr
- */
- static void gmtsub(const time_t * timep, long offset, struct tm * tmp)
- {
- pthread_mutex_lock(&gmt_mutex);
- if (gmt_is_set == FALSE) {
- gmt_is_set = TRUE;
- gmtload(gmtptr);
- }
- pthread_mutex_unlock(&gmt_mutex);
-
- timesub(timep, offset, gmtptr, tmp);
- /*
- ** 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.
- */
- #ifdef BSD_TM
- if (offset != 0) {
- tmp->tm_zone = WILDABBR;
- } else {
- tmp->tm_zone = gmtptr->chars;
- }
- #endif
- }
- struct tm * gmtime_r(const time_t * timep, struct tm * tm)
- {
- gmtsub(timep, 0L, tm);
- return(tm);
- }
- struct tm * gmtime(const time_t * timep)
- {
- static pthread_mutex_t gmtime_mutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_key_t gmtime_key = -1;
- struct tm * tm;
- pthread_mutex_lock(&gmtime_mutex);
- if (gmtime_key < 0) {
- if (pthread_key_create(&gmtime_key, free) < 0) {
- pthread_mutex_unlock(&gmtime_mutex);
- return(NULL);
- }
- }
- pthread_mutex_unlock(&gmtime_mutex);
- if ((tm = pthread_getspecific(gmtime_key)) == NULL) {
- if ((tm = (struct tm *)malloc(sizeof(struct tm))) == NULL) {
- return(NULL);
- }
- pthread_setspecific(gmtime_key, tm);
- }
- gmtsub(timep, 0L, tm);
- return(tm);
- }
- static void timesub(const time_t * timep, long offset,
- const struct state * sp, struct tm * 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 = FALSE;
- i = sp->leapcnt;
- 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);
- 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".
- */
- ++(tmp->tm_sec);
- 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 BSD_TM
- tmp->tm_gmtoff = offset;
- #endif
- }
- /*
- * A la X3J11
- *
- * Made thread safe by using thread specific data
- */
- char * asctime_r(const struct tm * timeptr, char * result)
- {
- static const char wday_name[DAYSPERWEEK][3] = {
- "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
- };
- static const char mon_name[MONSPERYEAR][3] = {
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
- };
- (void) sprintf(result, "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %dn",
- wday_name[timeptr->tm_wday],
- mon_name[timeptr->tm_mon],
- timeptr->tm_mday, timeptr->tm_hour,
- timeptr->tm_min, timeptr->tm_sec,
- TM_YEAR_BASE + timeptr->tm_year);
- return(result);
- }
- char * asctime(const struct tm * timeptr)
- {
- static pthread_mutex_t asctime_mutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_key_t asctime_key = -1;
- char * result;
- pthread_mutex_lock(&asctime_mutex);
- if (asctime_key < 0) {
- if (pthread_key_create(&asctime_key, free) < 0) {
- pthread_mutex_unlock(&asctime_mutex);
- return(NULL);
- }
- }
- pthread_mutex_unlock(&asctime_mutex);
- if ((result = pthread_getspecific(asctime_key)) == NULL) {
- if ((result = malloc(26)) == NULL) {
- return(NULL);
- }
- pthread_setspecific(asctime_key, result);
- }
- return(asctime_r(timeptr, result));
- }
- char * ctime_r(const time_t * timep, char * buf)
- {
- struct tm tm;
- return asctime_r(localtime_r(timep, &tm), buf);
- }
- char * ctime(const time_t * timep)
- {
- struct tm tm;
- return asctime(localtime_r(timep, &tm));
- }
- /*
- ** 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).
- */
- static void normalize(int * tensptr,int * unitsptr, int base)
- {
- if (*unitsptr >= base) {
- *tensptr += *unitsptr / base;
- *unitsptr %= base;
- } else if (*unitsptr < 0) {
- --*tensptr;
- *unitsptr += base;
- if (*unitsptr < 0) {
- *tensptr -= 1 + (-*unitsptr) / base;
- *unitsptr = base - (-*unitsptr) % base;
- }
- }
- }
- static int tmcomp(const struct tm * atmp, const struct tm * 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(struct tm * tmp, long offset, int * 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 (yourtm.tm_sec >= SECSPERMIN + 2 || yourtm.tm_sec < 0)
- normalize(&yourtm.tm_min, &yourtm.tm_sec, SECSPERMIN);
- normalize(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR);
- normalize(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY);
- normalize(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR);
- while (yourtm.tm_mday <= 0) {
- --yourtm.tm_year;
- yourtm.tm_mday +=
- year_lengths[isleap(yourtm.tm_year + TM_YEAR_BASE)];
- }
- for ( ; ; ) {
- i = mon_lengths[isleap(yourtm.tm_year +
- TM_YEAR_BASE)][yourtm.tm_mon];
- if (yourtm.tm_mday <= i)
- break;
- yourtm.tm_mday -= i;
- if (++yourtm.tm_mon >= MONSPERYEAR) {
- yourtm.tm_mon = 0;
- ++yourtm.tm_year;
- }
- }
- 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)
- ;
- /*
- ** 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 ( ; ; ) {
- localsub(&t, offset, &mytm);
- dir = tmcomp(&mytm, &yourtm);
- if (dir != 0) {
- if (bits-- < 0)
- return NOTOK;
- 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.
- */
- sp = lclptr;
- 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;
- localsub(&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 NOTOK;
- }
- label:
- t += saved_seconds;
- localsub(&t, offset, tmp);
- *okayp = TRUE;
- return t;
- }
- static time_t time1(struct tm * tmp, long offset)
- {
- const struct state * sp;
- int samei, otheri, okay;
- time_t t;
- if (tmp->tm_isdst > 1)
- tmp->tm_isdst = 1;
- t = time2(tmp, offset, &okay);
- if (okay || tmp->tm_isdst < 0)
- return t;
- /*
- ** 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.
- */
- sp = lclptr;
- 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, 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 NOTOK;
- }
- time_t mktime(struct tm * tmp)
- {
- time_t mktime_return_value;
- pthread_mutex_lock(&lcl_mutex);
- if (lcl_is_set == FALSE) {
- tzset_basic();
- }
- mktime_return_value = time1(tmp, 0L);
- pthread_mutex_unlock(&lcl_mutex);
- return(mktime_return_value);
- }