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+++ Libc/Libc-262/gen/ctime.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ *
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1987, 1989, 1993
+ * The Regents of the University of California. 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.
+ */
+
+
+/*
+** 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 <sys/param.h>
+#include <fcntl.h>
+#include <time.h>
+#include <tzfile.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifdef __STDC__
+#include <stdlib.h>
+
+#define P(s) s
+#define alloc_size_t size_t
+#define qsort_size_t size_t
+#define fread_size_t size_t
+#define fwrite_size_t size_t
+
+#else /* !defined __STDC__ */
+
+#define P(s) ()
+
+typedef char * genericptr_t;
+typedef unsigned alloc_size_t;
+typedef int qsort_size_t;
+typedef int fread_size_t;
+typedef int fwrite_size_t;
+
+extern char * calloc();
+extern char * malloc();
+extern char * realloc();
+extern char * getenv();
+
+#endif /* !defined __STDC__ */
+
+extern time_t time();
+
+#define ACCESS_MODE O_RDONLY
+#define OPEN_MODE O_RDONLY
+
+#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 * 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 void normalize 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 */
+
+static int lcl_is_set;
+static int gmt_is_set;
+
+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(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()
+{
+ 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;
+ {
+ 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, 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;
+
+ 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(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;
+
+ 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;
+ 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(sp)
+struct state * const sp;
+{
+ if (tzload(GMT, sp) != 0)
+ (void) tzparse(GMT, sp, TRUE);
+}
+
+void
+tzset()
+{
+ register const char * name;
+ void tzsetwall();
+
+ name = getenv("TZ");
+ if (name == NULL) {
+ tzsetwall();
+ return;
+ }
+ lcl_is_set = TRUE;
+#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();
+}
+
+void
+tzsetwall()
+{
+ lcl_is_set = TRUE;
+#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();
+}
+
+/*
+** 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 struct state * sp;
+ register const struct ttinfo * ttisp;
+ register int i;
+ const time_t t = *timep;
+
+ if (!lcl_is_set)
+ tzset();
+ 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];
+ tmp->tm_zone = &sp->chars[ttisp->tt_abbrind];
+}
+
+struct tm *
+localtime(timep)
+const time_t * const timep;
+{
+ static struct tm tm;
+
+ 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);
+ /*
+ ** 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 */
+ }
+}
+
+struct tm *
+gmtime(timep)
+const time_t * const timep;
+{
+ static struct tm tm;
+
+ gmtsub(timep, 0L, &tm);
+ return &tm;
+}
+
+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 = FALSE;
+#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);
+ 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;
+ tmp->tm_gmtoff = offset;
+}
+
+/*
+** A la X3J11
+*/
+
+char *
+asctime(timeptr)
+register const struct tm * timeptr;
+{
+ 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"
+ };
+ static char result[26];
+
+ (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 *
+ctime(timep)
+const time_t * const timep;
+{
+ 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 */
+
+static void
+normalize(tensptr, unitsptr, base)
+int * const tensptr;
+int * const unitsptr;
+const int base;
+{
+ if (*unitsptr >= base) {
+ *tensptr += *unitsptr / base;
+ *unitsptr %= base;
+ } else if (*unitsptr < 0) {
+ *tensptr -= 1 + (-(*unitsptr + 1)) / base;
+ *unitsptr = base - 1 - (-(*unitsptr + 1)) % base;
+ }
+}
+
+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 (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)];
+ }
+ while (yourtm.tm_mday > DAYSPERLYEAR) {
+ yourtm.tm_mday -=
+ year_lengths[isleap(yourtm.tm_year + TM_YEAR_BASE)];
+ ++yourtm.tm_year;
+ }
+ 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 ( ; ; ) {
+ (*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.
+ */
+ sp = (const struct state *)
+ ((funcp == 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:
+ t += saved_seconds;
+ (*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);
+ 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 = (const struct state *) ((funcp == 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;
+{
+ return time1(tmp, localsub, 0L);
+}