#define COMPILING_RCPP
#include <R_ext/Boolean.h>
#include <Rcpp.h>
#include <time.h>
#include <Rcpp/exceptions.h>
namespace Rcpp {
There are two implementation paths here.
1) Use the system functions for mktime, gmtime[_r], localtime[_r], strftime.
Use the system time_t, struct tm and time-zone tables.
2) Use substitutes from src/extra/tzone for mktime, gmtime, localtime,
strftime with a R_ prefix. The system strftime is used for
locale-dependent names in R_strptime and R_strftime. This uses the
time-zone tables shipped with R and installed into
R_HOME/share/zoneinfo .
Our own versions of time_t (64-bit) and struct tm (including the
BSD-style fields tm_zone and tm_gmtoff) are used.
For path 1), the system facilities are used for 1902-2037 and outside
those limits where there is a 64-bit time_t and the conversions work
(most OSes currently have only 32-bit time-zone tables). Otherwise
there is code below to extrapolate from 1902-2037.
Path 2) was added for R 3.1.0 and is the only one supported on
Windows: it is the default on macOS. The only currently (Jan 2014)
known OS with 64-bit time_t and complete tables is Linux.
*/
double mktime00(struct tm &tm) {
static const int days_in_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static const int year_base = 1900;
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
#define days_in_year(year) (isleap(year) ? 366 : 365)
int day = 0;
int i, year, year0;
double excess = 0.0;
day = tm.tm_mday - 1;
year0 = year_base + tm.tm_year;
if (year0 > 3000) {
excess = (int)(year0/2000) - 1;
year0 -= (int)(excess * 2000);
} else if (year0 < 0) {
excess = -1 - (int)(-year0/2000);
year0 -= (int)(excess * 2000);
}
for(i = 0; i < tm.tm_mon; i++) day += days_in_month[i];
if (tm.tm_mon > 1 && isleap(year0)) day++;
tm.tm_yday = day;
if (year0 > 1970) {
for (year = 1970; year < year0; year++)
day += days_in_year(year);
} else if (year0 < 1970) {
for (year = 1969; year >= year0; year--)
day -= days_in_year(year);
}
if ((tm.tm_wday = (day + 4) % 7) < 0) tm.tm_wday += 7;
return tm.tm_sec + (tm.tm_min * 60) + (tm.tm_hour * 3600)
+ (day + excess * 730485) * 86400.0;
}
#undef isleap
#undef days_in_year
#include "sys/types.h"
#include "string.h"
#include "limits.h"
#define _NO_OLDNAMES
#include "time.h"
#undef _NO_OLDNAMES
#include <errno.h>
#ifndef EOVERFLOW
# define EOVERFLOW 79
#endif
#include "stdlib.h"
#include "stdint.h"
#include "stdio.h"
#include "fcntl.h"
#include "float.h"
#include <unistd.h>
#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
#define TYPE_SIGNED(type) (((type) -1) < 0)
#define TYPE_INTEGRAL(type) (((type) 0.5) != 0.5)
#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
#define GRANDPARENTED "Local time zone must be set--see zic manual page"
#define YEARSPERREPEAT 400
#define AVGSECSPERYEAR 31556952L
#define SECSPERREPEAT ((int_fast64_t) YEARSPERREPEAT * (int_fast64_t) AVGSECSPERYEAR)
#define SECSPERREPEAT_BITS 34
#define is_digit(c) ((unsigned)(c) - '0' <= 9)
#define INITIALIZE(x) (x = 0)
B bits are used, and where the highest-order used bit is considered
to be a sign bit if T is signed. */
#define MAXVAL(t, b) \
((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
- 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
#define MINVAL(t, b) \
((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
static time_t const time_t_min = MINVAL(time_t, TYPE_BIT(time_t));
static time_t const time_t_max = MAXVAL(time_t, TYPE_BIT(time_t));
#ifndef TZFILE_H
#define TZFILE_H
** This file is in the public domain, so clarified as of
** 1996-06-05 by Arthur David Olson.
*/
** This header is for use ONLY with the time conversion code.
** There is no guarantee that it will remain unchanged,
** or that it will remain at all.
** Do NOT copy it to any system include directory.
** Thank you!
*/
** Information about time zone files.
*/
#ifndef TZDIR
#define TZDIR "/usr/local/etc/zoneinfo"
#endif
#ifndef TZDEFAULT
#define TZDEFAULT "localtime"
#endif
#ifndef TZDEFRULES
#define TZDEFRULES "America/New_York"
#endif
** Each file begins with. . .
*/
#define TZ_MAGIC "TZif"
struct tzhead {
char tzh_magic[4];
char tzh_version[1];
char tzh_reserved[15];
char tzh_ttisgmtcnt[4];
char tzh_ttisstdcnt[4];
char tzh_leapcnt[4];
char tzh_timecnt[4];
char tzh_typecnt[4];
char tzh_charcnt[4];
};
** . . .followed by. . .
**
** tzh_timecnt (char [4])s coded transition times a la time(2)
** tzh_timecnt (unsigned char)s types of local time starting at above
** tzh_typecnt repetitions of
** one (char [4]) coded UTC offset in seconds
** one (unsigned char) used to set tm_isdst
** one (unsigned char) that's an abbreviation list index
** tzh_charcnt (char)s '\0'-terminated zone abbreviations
** tzh_leapcnt repetitions of
** one (char [4]) coded leap second transition times
** one (char [4]) total correction after above
** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
** time is standard time, if FALSE,
** transition time is wall clock time
** if absent, transition times are
** assumed to be wall clock time
** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
** time is UTC, if FALSE,
** transition time is local time
** if absent, transition times are
** assumed to be local time
*/
** If tzh_version is '2' or greater, the above is followed by a second instance
** of tzhead and a second instance of the data in which each coded transition
** time uses 8 rather than 4 chars,
** then a POSIX-TZ-environment-variable-style string for use in handling
** instants after the last transition time stored in the file
** (with nothing between the newlines if there is no POSIX representation for
** such instants).
**
** If tz_version is '3' or greater, the above is extended as follows.
** First, the POSIX TZ string's hour offset may range from -167
** through 167 as compared to the POSIX-required 0 through 24.
** Second, its DST start time may be January 1 at 00:00 and its stop
** time December 31 at 24:00 plus the difference between DST and
** standard time, indicating DST all year.
*/
** In the current implementation, "tzset()" refuses to deal with files that
** exceed any of the limits below.
*/
#ifndef TZ_MAX_TIMES
#define TZ_MAX_TIMES 1200
#endif
#ifndef TZ_MAX_TYPES
#ifndef NOSOLAR
#define TZ_MAX_TYPES 256
#endif
#ifdef NOSOLAR
** Must be at least 14 for Europe/Riga as of Jan 12 1995,
** as noted by Earl Chew.
*/
#define TZ_MAX_TYPES 20
#endif
#endif
#ifndef TZ_MAX_CHARS
#define TZ_MAX_CHARS 100
#endif
#ifndef TZ_MAX_LEAPS
#define TZ_MAX_LEAPS 50
#endif
#define SECSPERMIN 60
#define MINSPERHOUR 60
#define HOURSPERDAY 24
#define DAYSPERWEEK 7
#define DAYSPERNYEAR 365
#define DAYSPERLYEAR 366
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
#define MONSPERYEAR 12
#define TM_SUNDAY 0
#define TM_MONDAY 1
#define TM_TUESDAY 2
#define TM_WEDNESDAY 3
#define TM_THURSDAY 4
#define TM_FRIDAY 5
#define TM_SATURDAY 6
#define TM_JANUARY 0
#define TM_FEBRUARY 1
#define TM_MARCH 2
#define TM_APRIL 3
#define TM_MAY 4
#define TM_JUNE 5
#define TM_JULY 6
#define TM_AUGUST 7
#define TM_SEPTEMBER 8
#define TM_OCTOBER 9
#define TM_NOVEMBER 10
#define TM_DECEMBER 11
#define TM_YEAR_BASE 1900
#define EPOCH_YEAR 1970
#define EPOCH_WDAY TM_THURSDAY
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
** Since everything in isleap is modulo 400 (or a factor of 400), we know that
** isleap(y) == isleap(y % 400)
** and so
** isleap(a + b) == isleap((a + b) % 400)
** or
** isleap(a + b) == isleap(a % 400 + b % 400)
** This is true even if % means modulo rather than Fortran remainder
** (which is allowed by C89 but not C99).
** We use this to avoid addition overflow problems.
*/
#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
#endif
#ifdef O_BINARY
#define OPEN_MODE (O_RDONLY | O_BINARY)
#endif
#ifndef O_BINARY
#define OPEN_MODE O_RDONLY
#endif
static const char gmt[] = "GMT";
** The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
** We default to US rules as of 1999-08-17.
** POSIX 1003.1 section 8.1.1 says that the default DST rules are
** implementation dependent; for historical reasons, US rules are a
** common default.
*/
#ifndef TZDEFRULESTRING
#define TZDEFRULESTRING ",M4.1.0,M10.5.0"
#endif
#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
#ifdef TZNAME_MAX
#define MY_TZNAME_MAX TZNAME_MAX
#endif
#ifndef TZNAME_MAX
#define MY_TZNAME_MAX 255
#endif
struct ttinfo {
int_fast32_t tt_gmtoff;
int tt_isdst;
int tt_abbrind;
int tt_ttisstd;
int tt_ttisgmt;
};
struct lsinfo {
time_t ls_trans;
int_fast64_t ls_corr;
};
struct state {
int leapcnt;
int timecnt;
int typecnt;
int charcnt;
int goback;
int goahead;
time_t ats[TZ_MAX_TIMES];
unsigned char types[TZ_MAX_TIMES];
struct ttinfo ttis[TZ_MAX_TYPES];
char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt),
(2 * (MY_TZNAME_MAX + 1)))];
struct lsinfo lsis[TZ_MAX_LEAPS];
};
struct rule {
int r_type;
int r_day;
int r_week;
int r_mon;
int_fast32_t r_time;
};
#define JULIAN_DAY 0
#define DAY_OF_YEAR 1
#define MONTH_NTH_DAY_OF_WEEK 2
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
};
static int gmt_is_set;
static struct state gmtmem;
#define gmtptr (&gmtmem)
static struct tm tm;
static int tzparse(const char * name, struct state * sp, int lastditch);
static int typesequiv(const struct state * sp, int a, int b);
static const char * getsecs(const char * strp, int_fast32_t * secsp);
static const char * getnum(const char * strp, int * const nump, const int min, const int max);
static const char * getrule(const char * strp, struct rule * const rulep);
static int_fast32_t transtime(int year, const struct rule * rulep, int_fast32_t offset);
static struct tm * timesub(const time_t *timep, int_fast32_t offset, const struct state *sp, struct tm *tmp);
static int leaps_thru_end_of(const int y);
** Normalize logic courtesy Paul Eggert.
*/
static int increment_overflow(int *const ip, int j) {
int const i = *ip;
** If i >= 0 there can only be overflow if i + j > INT_MAX
** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow.
** If i < 0 there can only be overflow if i + j < INT_MIN
** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow.
*/
if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i))
return TRUE;
*ip += j;
return FALSE;
}
static int increment_overflow_time(time_t *tp, int_fast32_t j) {
** This is like
** 'if (! (time_t_min <= *tp + j && *tp + j <= time_t_max)) ...',
** except that it does the right thing even if *tp + j would overflow.
*/
if (! (j < 0
? (TYPE_SIGNED(time_t) ? time_t_min - j <= *tp : -1 - j < *tp)
: *tp <= time_t_max - j))
return TRUE;
*tp += j;
return FALSE;
}
static int_fast32_t detzcode(const char *const codep) {
int_fast32_t result = (codep[0] & 0x80) ? -1 : 0;
for (int i = 0; i < 4; ++i)
result = (result << 8) | (codep[i] & 0xff);
return result;
}
static int_fast64_t detzcode64(const char *const codep) {
int_fast64_t result = (codep[0] & 0x80) ? -1 : 0;
for (int i = 0; i < 8; ++i)
result = (result << 8) | (codep[i] & 0xff);
return result;
}
static int differ_by_repeat(const time_t t1, const time_t t0) {
if (TYPE_INTEGRAL(time_t) &&
TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS)
return 0;
return (int_fast64_t)t1 - (int_fast64_t)t0 == SECSPERREPEAT;
}
static const char * getzname(const char * strp) {
char c;
while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
c != '+')
++strp;
return strp;
}
static const char * getqzname(const char *strp, const int delim) {
int c;
while ((c = *strp) != '\0' && c != delim)
++strp;
return strp;
}
static const char * getoffset(const char *strp, int_fast32_t *const offsetp) {
int neg = 0;
if (*strp == '-') {
neg = 1;
++strp;
} else if (*strp == '+')
++strp;
strp = getsecs(strp, offsetp);
if (strp == NULL)
return NULL;
if (neg)
*offsetp = -*offsetp;
return strp;
}
static const char * getsecs(const char *strp, int_fast32_t *const secsp) {
int num;
** 'HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
** "M10.4.6/26", which does not conform to Posix,
** but which specifies the equivalent of
** "02:00 on the first Sunday on or after 23 Oct".
*/
strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
if (strp == NULL)
return NULL;
*secsp = num * (int_fast32_t) 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);
if (strp == NULL)
return NULL;
*secsp += num;
}
}
return strp;
}
static const char * getnum(const char * strp, int * const nump, const int min, const int max) {
char c;
int num;
if (strp == NULL || !is_digit(c = *strp))
return NULL;
num = 0;
do {
num = num * 10 + (c - '0');
if (num > max)
return NULL;
c = *++strp;
} while (is_digit(c));
if (num < min)
return NULL;
*nump = num;
return strp;
}
static const char * getrule(const char * strp, 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 (is_digit(*strp)) {
** Day of year.
*/
rulep->r_type = DAY_OF_YEAR;
strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
} else return NULL;
if (strp == NULL)
return NULL;
if (*strp == '/') {
** Time specified.
*/
++strp;
strp = getsecs(strp, &rulep->r_time);
} else rulep->r_time = 2 * SECSPERHOUR;
return strp;
}
static int tzload(const char * name, struct state * const sp, const int doextend) {
const char * p;
int i;
int fid;
int stored;
int nread;
union {
struct tzhead tzhead;
char buf[2 * sizeof(struct tzhead) +
2 * sizeof *sp + 4 * TZ_MAX_TIMES];
} u;
sp->goback = sp->goahead = FALSE;
if (name == NULL) {
name = TZDEFAULT;
}
{
int doaccess;
** Section 4.9.1 of the C standard says that
** "FILENAME_MAX expands to an integral constant expression
** that is the size needed for an array of char large enough
** to hold the longest file name string that the implementation
** guarantees can be opened."
*/
char fullname[FILENAME_MAX + 1];
if (name[0] == ':')
++name;
doaccess = name[0] == '/';
if (!doaccess) {
char buf[1000];
p = getenv("TZDIR");
if (p == NULL) {
snprintf(buf, 1000, "%s/share/zoneinfo",
getenv("R_HOME"));
buf[999] = '\0';
p = buf;
}
if ((strlen(p) + strlen(name) + 1) >= sizeof fullname)
return -1;
(void) strcpy(fullname, p);
(void) strcat(fullname, "/");
(void) strcat(fullname, name);
** Set doaccess if '.' (as in "../") shows up in name.
*/
if (strchr(name, '.') != NULL) doaccess = TRUE;
name = fullname;
}
if ((fid = open(name, OPEN_MODE)) == -1) {
return -1;
}
}
nread = (int)read(fid, u.buf, sizeof u.buf);
if (close(fid) < 0 || nread <= 0)
return -1;
for (stored = 4; stored <= 8; stored *= 2) {
int ttisstdcnt;
int ttisgmtcnt;
ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt);
ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt);
sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt);
sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt);
sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt);
sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt);
p = u.tzhead.tzh_charcnt + sizeof u.tzhead.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) ||
(ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
return -1;
if (nread - (p - u.buf) <
sp->timecnt * stored +
sp->timecnt +
sp->typecnt * 6 +
sp->charcnt +
sp->leapcnt * (stored + 4) +
ttisstdcnt +
ttisgmtcnt)
return -1;
for (i = 0; i < sp->timecnt; ++i) {
sp->ats[i] = (stored == 4) ? detzcode(p) : detzcode64(p);
p += stored;
}
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) {
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';
for (i = 0; i < sp->leapcnt; ++i) {
struct lsinfo * lsisp;
lsisp = &sp->lsis[i];
lsisp->ls_trans = (stored == 4) ? detzcode(p) : detzcode64(p);
p += stored;
lsisp->ls_corr = detzcode(p);
p += 4;
}
for (i = 0; i < sp->typecnt; ++i) {
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;
}
}
for (i = 0; i < sp->typecnt; ++i) {
struct ttinfo * ttisp;
ttisp = &sp->ttis[i];
if (ttisgmtcnt == 0)
ttisp->tt_ttisgmt = FALSE;
else {
ttisp->tt_ttisgmt = *p++;
if (ttisp->tt_ttisgmt != TRUE && ttisp->tt_ttisgmt != FALSE)
return -1;
}
}
** Out-of-sort ats should mean we're running on a
** signed time_t system but using a data file with
** unsigned values (or vice versa).
*/
for (i = 0; i < sp->timecnt - 2; ++i)
if (sp->ats[i] > sp->ats[i + 1]) {
++i;
if (TYPE_SIGNED(time_t)) {
** Ignore the end (easy).
*/
sp->timecnt = i;
} else {
** Ignore the beginning (harder).
*/
int j;
for (j = 0; j + i < sp->timecnt; ++j) {
sp->ats[j] = sp->ats[j + i];
sp->types[j] = sp->types[j + i];
}
sp->timecnt = j;
}
break;
}
** If this is an old file, we're done.
*/
if (u.tzhead.tzh_version[0] == '\0')
break;
nread -= (int)(p - u.buf);
for (i = 0; i < nread; ++i)
u.buf[i] = p[i];
** If this is a narrow integer time_t system, we're done.
*/
if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t))
break;
}
if (doextend && nread > 2 &&
u.buf[0] == '\n' && u.buf[nread - 1] == '\n' &&
sp->typecnt + 2 <= TZ_MAX_TYPES) {
struct state ts;
int result;
u.buf[nread - 1] = '\0';
result = tzparse(&u.buf[1], &ts, FALSE);
if (result == 0 && ts.typecnt == 2 &&
sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) {
for (i = 0; i < 2; ++i)
ts.ttis[i].tt_abbrind += sp->charcnt;
for (i = 0; i < ts.charcnt; ++i)
sp->chars[sp->charcnt++] = ts.chars[i];
i = 0;
while (i < ts.timecnt && ts.ats[i] <= sp->ats[sp->timecnt - 1])
++i;
while (i < ts.timecnt &&
sp->timecnt < TZ_MAX_TIMES) {
sp->ats[sp->timecnt] = ts.ats[i];
sp->types[sp->timecnt] = (unsigned char)sp->typecnt + ts.types[i];
++sp->timecnt;
++i;
}
sp->ttis[sp->typecnt++] = ts.ttis[0];
sp->ttis[sp->typecnt++] = ts.ttis[1];
}
}
i = 2 * YEARSPERREPEAT;
sp->goback = sp->goahead = sp->timecnt > i;
sp->goback = sp->goback &&
typesequiv(sp, sp->types[i], sp->types[0]) &&
differ_by_repeat(sp->ats[i], sp->ats[0]);
sp->goahead = sp->goahead &&
typesequiv(sp, sp->types[sp->timecnt - 1],
sp->types[sp->timecnt - 1 - i]) &&
differ_by_repeat(sp->ats[sp->timecnt - 1],
sp->ats[sp->timecnt - 1 - i]);
return 0;
}
** Given a year, a rule, and the offset from UT at the time that rule takes
** effect, calculate the year-relative time that rule takes effect.
*/
static int_fast32_t transtime(const int year, const struct rule *const rulep, const int_fast32_t offset) {
int leapyear;
int_fast32_t value;
int d, m1, yy0, yy1, yy2, dow;
INITIALIZE(value);
leapyear = isleap(year);
switch (rulep->r_type) {
case JULIAN_DAY:
** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
** years.
** In non-leap years, or if the day number is 59 or less, just
** add SECSPERDAY times the day number-1 to the time of
** January 1, midnight, to get the day.
*/
value = (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 = rulep->r_day * SECSPERDAY;
break;
case MONTH_NTH_DAY_OF_WEEK:
** Mm.n.d - nth "dth day" of month m.
*/
** 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 (int 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;
for (int i = 0; i < rulep->r_mon - 1; ++i)
value += mon_lengths[leapyear][i] * SECSPERDAY;
break;
}
** "value" is the year-relative time of 00:00:00 UT on the day in
** question. To get the year-relative time of the specified local
** time on that day, add the transition time and the current offset
** from UT.
*/
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 * const sp, const int lastditch) {
const char * stdname;
const char * dstname;
size_t stdlen;
size_t dstlen;
int_fast32_t stdoffset;
int_fast32_t dstoffset;
char * cp;
int load_result;
static struct ttinfo zttinfo;
INITIALIZE(dstname);
stdname = name;
if (lastditch) {
stdlen = strlen(name);
name += stdlen;
if (stdlen >= sizeof sp->chars)
stdlen = (sizeof sp->chars) - 1;
stdoffset = 0;
} else {
if (*name == '<') {
name++;
stdname = name;
name = getqzname(name, '>');
if (*name != '>')
return (-1);
stdlen = name - stdname;
name++;
} else {
name = getzname(name);
stdlen = name - stdname;
}
if (*name == '\0')
return -1;
name = getoffset(name, &stdoffset);
if (name == NULL)
return -1;
}
load_result = tzload(TZDEFRULES, sp, FALSE);
if (load_result != 0)
sp->leapcnt = 0;
if (*name != '\0') {
if (*name == '<') {
dstname = ++name;
name = getqzname(name, '>');
if (*name != '>')
return -1;
dstlen = name - dstname;
name++;
} else {
dstname = name;
name = getzname(name);
dstlen = name - dstname;
}
if (*name != '\0' && *name != ',' && *name != ';') {
name = getoffset(name, &dstoffset);
if (name == NULL)
return -1;
} else dstoffset = stdoffset - SECSPERHOUR;
if (*name == '\0' && load_result != 0)
name = TZDEFRULESTRING;
if (*name == ',' || *name == ';') {
struct rule start;
struct rule end;
int year;
int yearlim;
int timecnt;
time_t janfirst;
++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;
** Two transitions per year, from EPOCH_YEAR forward.
*/
sp->ttis[0] = sp->ttis[1] = zttinfo;
sp->ttis[0].tt_gmtoff = -dstoffset;
sp->ttis[0].tt_isdst = 1;
sp->ttis[0].tt_abbrind = (int)(stdlen + 1);
sp->ttis[1].tt_gmtoff = -stdoffset;
sp->ttis[1].tt_isdst = 0;
sp->ttis[1].tt_abbrind = 0;
timecnt = 0;
janfirst = 0;
yearlim = EPOCH_YEAR + YEARSPERREPEAT;
for (year = EPOCH_YEAR; year < yearlim; year++) {
int_fast32_t
starttime = transtime(year, &start, stdoffset),
endtime = transtime(year, &end, dstoffset);
int_fast32_t
yearsecs = (year_lengths[isleap(year)]
* SECSPERDAY);
int reversed = endtime < starttime;
if (reversed) {
int_fast32_t swap = starttime;
starttime = endtime;
endtime = swap;
}
if (reversed
|| (starttime < endtime
&& (endtime - starttime
< (yearsecs
+ (stdoffset - dstoffset))))) {
if (TZ_MAX_TIMES - 2 < timecnt)
break;
yearlim = year + YEARSPERREPEAT + 1;
sp->ats[timecnt] = janfirst;
if (increment_overflow_time
(&sp->ats[timecnt], starttime))
break;
sp->types[timecnt++] = (unsigned char) reversed;
sp->ats[timecnt] = janfirst;
if (increment_overflow_time
(&sp->ats[timecnt], endtime))
break;
sp->types[timecnt++] = !reversed;
}
if (increment_overflow_time(&janfirst, yearsecs))
break;
}
sp->timecnt = timecnt;
if (!timecnt)
sp->typecnt = 1;
} else {
int_fast32_t theirstdoffset, theirdstoffset, theiroffset;
int isdst;
if (*name != '\0')
return -1;
** Initial values of theirstdoffset and theirdstoffset.
*/
theirstdoffset = 0;
for (int i = 0; i < sp->timecnt; ++i) {
int j = sp->types[i];
if (!sp->ttis[j].tt_isdst) {
theirstdoffset =
-sp->ttis[j].tt_gmtoff;
break;
}
}
theirdstoffset = 0;
for (int i = 0; i < sp->timecnt; ++i) {
int j = sp->types[i];
if (sp->ttis[j].tt_isdst) {
theirdstoffset =
-sp->ttis[j].tt_gmtoff;
break;
}
}
** Initially we're assumed to be in standard time.
*/
isdst = FALSE;
theiroffset = theirstdoffset;
** Now juggle transition times and types
** tracking offsets as you do.
*/
for (int i = 0; i < sp->timecnt; ++i) {
int j = sp->types[i];
sp->types[i] = (unsigned char)sp->ttis[j].tt_isdst;
if (sp->ttis[j].tt_ttisgmt) {
} else {
** 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.
*/
** Transitions from DST to DDST
** will effectively disappear since
** POSIX provides for only one DST
** offset.
*/
if (isdst && !sp->ttis[j].tt_ttisstd) {
sp->ats[i] += dstoffset -
theirdstoffset;
} else {
sp->ats[i] += stdoffset -
theirstdoffset;
}
}
theiroffset = -sp->ttis[j].tt_gmtoff;
if (sp->ttis[j].tt_isdst)
theirdstoffset = theiroffset;
else theirstdoffset = theiroffset;
}
** Finally, fill in ttis.
*/
sp->ttis[0] = sp->ttis[1] = zttinfo;
sp->ttis[0].tt_gmtoff = -stdoffset;
sp->ttis[0].tt_isdst = FALSE;
sp->ttis[0].tt_abbrind = 0;
sp->ttis[1].tt_gmtoff = -dstoffset;
sp->ttis[1].tt_isdst = TRUE;
sp->ttis[1].tt_abbrind = (int)(stdlen + 1);
sp->typecnt = 2;
}
} else {
dstlen = 0;
sp->typecnt = 1;
sp->timecnt = 0;
sp->ttis[0] = zttinfo;
sp->ttis[0].tt_gmtoff = -stdoffset;
sp->ttis[0].tt_isdst = 0;
sp->ttis[0].tt_abbrind = 0;
}
sp->charcnt = (int)(stdlen + 1);
if (dstlen != 0)
sp->charcnt += (int)(dstlen + 1);
if ((size_t) 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 int typesequiv(const struct state * const sp, const int a, const int b) {
int result;
if (sp == NULL ||
a < 0 || a >= sp->typecnt ||
b < 0 || b >= sp->typecnt)
result = FALSE;
else {
const struct ttinfo * ap = &sp->ttis[a];
const struct ttinfo * bp = &sp->ttis[b];
result = ap->tt_gmtoff == bp->tt_gmtoff &&
ap->tt_isdst == bp->tt_isdst &&
ap->tt_ttisstd == bp->tt_ttisstd &&
ap->tt_ttisgmt == bp->tt_ttisgmt &&
strcmp(&sp->chars[ap->tt_abbrind],
&sp->chars[bp->tt_abbrind]) == 0;
}
return result;
}
static int leaps_thru_end_of(const int y) {
return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
-(leaps_thru_end_of(-(y + 1)) + 1);
}
static struct tm * timesub(const time_t *const timep, const int_fast32_t offset,
const struct state *const sp, struct tm *const tmp) {
const struct lsinfo * lp;
time_t tdays;
int idays;
int_fast64_t rem;
int y;
const int * ip;
int_fast64_t corr;
int hit;
int i;
corr = 0;
hit = 0;
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);
if (hit)
while (i > 0 &&
sp->lsis[i].ls_trans ==
sp->lsis[i - 1].ls_trans + 1 &&
sp->lsis[i].ls_corr ==
sp->lsis[i - 1].ls_corr + 1) {
++hit;
--i;
}
}
corr = lp->ls_corr;
break;
}
}
y = EPOCH_YEAR;
tdays = *timep / SECSPERDAY;
rem = *timep - tdays * SECSPERDAY;
while (tdays < 0 || tdays >= year_lengths[isleap(y)]) {
int newy;
time_t tdelta;
int idelta;
int leapdays;
tdelta = tdays / DAYSPERLYEAR;
if (! ((! TYPE_SIGNED(time_t) || INT_MIN <= tdelta)
&& tdelta <= INT_MAX))
return NULL;
idelta = (int)tdelta;
if (idelta == 0)
idelta = (tdays < 0) ? -1 : 1;
newy = y;
if (increment_overflow(&newy, idelta))
return NULL;
leapdays = leaps_thru_end_of(newy - 1) -
leaps_thru_end_of(y - 1);
tdays -= ((time_t) newy - y) * DAYSPERNYEAR;
tdays -= leapdays;
y = newy;
}
{
int_fast32_t seconds;
seconds = (int_fast32_t)(tdays * SECSPERDAY);
tdays = seconds / SECSPERDAY;
rem += seconds - tdays * SECSPERDAY;
}
** Given the range, we can now fearlessly cast...
*/
idays = (int)tdays;
rem += offset - corr;
while (rem < 0) {
rem += SECSPERDAY;
--idays;
}
while (rem >= SECSPERDAY) {
rem -= SECSPERDAY;
++idays;
}
while (idays < 0) {
if (increment_overflow(&y, -1))
return NULL;
idays += year_lengths[isleap(y)];
}
while (idays >= year_lengths[isleap(y)]) {
idays -= year_lengths[isleap(y)];
if (increment_overflow(&y, 1))
return NULL;
}
tmp->tm_year = y + TM_YEAR_BASE;
if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE))
return NULL;
tmp->tm_yday = idays;
** The "extra" mods below avoid overflow problems.
*/
tmp->tm_wday = EPOCH_WDAY +
((y - EPOCH_YEAR) % DAYSPERWEEK) *
(DAYSPERNYEAR % DAYSPERWEEK) +
leaps_thru_end_of(y - 1) -
leaps_thru_end_of(EPOCH_YEAR - 1) +
idays;
tmp->tm_wday %= DAYSPERWEEK;
if (tmp->tm_wday < 0)
tmp->tm_wday += DAYSPERWEEK;
tmp->tm_hour = (int) (rem / SECSPERHOUR);
rem %= SECSPERHOUR;
tmp->tm_min = (int) (rem / SECSPERMIN);
** A positive leap second requires a special
** representation. This uses "... ??:59:60" et seq.
*/
tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
ip = mon_lengths[isleap(y)];
for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
idays -= ip[tmp->tm_mon];
tmp->tm_mday = (int) (idays + 1);
tmp->tm_isdst = 0;
#if ! (defined(__MINGW32__) || defined(__MINGW64__) || defined(__sun) || defined(sun) || defined(_AIX))
tmp->tm_gmtoff = offset;
#endif
return tmp;
}
static void gmtload(struct state * const sp) {
if (tzload(gmt, sp, TRUE) != 0)
(void) tzparse(gmt, sp, TRUE);
}
** gmtsub is to gmtime as localsub is to localtime.
*/
static struct tm * gmtsub(const time_t *const timep, const int_fast32_t offset, struct tm *const tmp) {
struct tm * result;
if (!gmt_is_set) {
gmt_is_set = TRUE;
gmtload(gmtptr);
}
result = timesub(timep, offset, gmtptr, tmp);
return result;
}
struct tm * gmtime_(const time_t * const timep) {
return gmtsub(timep, 0L, &tm);
}
}