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Diffstat (limited to 'mit-pthreads/gen/ctime.c')
| -rw-r--r-- | mit-pthreads/gen/ctime.c | 1315 |
1 files changed, 1315 insertions, 0 deletions
diff --git a/mit-pthreads/gen/ctime.c b/mit-pthreads/gen/ctime.c new file mode 100644 index 00000000000..e7980296e50 --- /dev/null +++ b/mit-pthreads/gen/ctime.c @@ -0,0 +1,1315 @@ +/* + * 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 long 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 long 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] = '\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(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(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) != '\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(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 == '\0') + 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 != '\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(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 == '\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); + } + 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 %d\n", + 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); +} |