#define LOCALTIME_IMPLEMENTATION
#include "private.h"
#include "tzfile.h"
#include <fcntl.h>
#if defined THREAD_SAFE && THREAD_SAFE
# include <pthread.h>
static pthread_mutex_t locallock = PTHREAD_MUTEX_INITIALIZER;
static int lock(void) { return pthread_mutex_lock(&locallock); }
static void unlock(void) { pthread_mutex_unlock(&locallock); }
#else
static int lock(void) { return 0; }
static void unlock(void) { }
#endif
#ifndef TZ_ABBR_MAX_LEN
#define TZ_ABBR_MAX_LEN 16
#endif
#ifndef TZ_ABBR_CHAR_SET
#define TZ_ABBR_CHAR_SET \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._"
#endif
#ifndef TZ_ABBR_ERR_CHAR
#define TZ_ABBR_ERR_CHAR '_'
#endif
#ifdef O_BINARY
#define OPEN_MODE (O_RDONLY | O_BINARY)
#endif
#ifndef O_BINARY
#define OPEN_MODE O_RDONLY
#endif
#ifndef WILDABBR
#define WILDABBR " "
#endif
static const char wildabbr[] = WILDABBR;
static const char gmt[] = "GMT";
#ifndef TZDEFRULESTRING
#define TZDEFRULESTRING ",M3.2.0,M11.1.0"
#endif
struct ttinfo {
int_fast32_t tt_utoff;
bool tt_isdst;
int tt_desigidx;
bool tt_ttisstd;
bool tt_ttisut;
};
struct lsinfo {
time_t ls_trans;
int_fast32_t ls_corr;
};
#define SMALLEST(a, b) (((a) < (b)) ? (a) : (b))
#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
static char const UNSPEC[] = "-00";
enum { CHARS_EXTRA = BIGGEST(sizeof UNSPEC, 2) - 1 };
#ifdef TZNAME_MAX
#define MY_TZNAME_MAX TZNAME_MAX
#endif
#ifndef TZNAME_MAX
#define MY_TZNAME_MAX 255
#endif
struct state {
int leapcnt;
int timecnt;
int typecnt;
int charcnt;
bool goback;
bool 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 + CHARS_EXTRA,
sizeof gmt),
(2 * (MY_TZNAME_MAX + 1)))];
struct lsinfo lsis[TZ_MAX_LEAPS];
int defaulttype;
};
enum r_type {
JULIAN_DAY,
DAY_OF_YEAR,
MONTH_NTH_DAY_OF_WEEK
};
struct rule {
enum r_type r_type;
int r_day;
int r_week;
int r_mon;
int_fast32_t r_time;
};
static struct tm *gmtsub(struct state const *, time_t const *, int_fast32_t,
struct tm *);
static bool increment_overflow(int *, int);
static bool increment_overflow_time(time_t *, int_fast32_t);
static int_fast32_t leapcorr(struct state const *, time_t);
static bool normalize_overflow32(int_fast32_t *, int *, int);
static struct tm *timesub(time_t const *, int_fast32_t, struct state const *,
struct tm *);
static bool typesequiv(struct state const *, int, int);
static bool tzparse(char const *, struct state *, struct state *);
#ifdef ALL_STATE
static struct state * lclptr;
static struct state * gmtptr;
#endif
#ifndef ALL_STATE
static struct state lclmem;
static struct state gmtmem;
#define lclptr (&lclmem)
#define gmtptr (&gmtmem)
#endif
#ifndef TZ_STRLEN_MAX
#define TZ_STRLEN_MAX 255
#endif
static char lcl_TZname[TZ_STRLEN_MAX + 1];
static int lcl_is_set;
static struct tm tm;
#if 2 <= HAVE_TZNAME + TZ_TIME_T
char * tzname[2] = {
(char *) wildabbr,
(char *) wildabbr
};
#endif
#if 2 <= USG_COMPAT + TZ_TIME_T
long timezone;
int daylight;
#endif
#if 2 <= ALTZONE + TZ_TIME_T
long altzone;
#endif
static void
init_ttinfo(struct ttinfo *s, int_fast32_t utoff, bool isdst, int desigidx)
{
s->tt_utoff = utoff;
s->tt_isdst = isdst;
s->tt_desigidx = desigidx;
s->tt_ttisstd = false;
s->tt_ttisut = false;
}
static bool
ttunspecified(struct state const *sp, int i)
{
char const *abbr = &sp->chars[sp->ttis[i].tt_desigidx];
return memcmp(abbr, UNSPEC, sizeof UNSPEC) == 0;
}
static int_fast32_t
detzcode(const char *const codep)
{
register int_fast32_t result;
register int i;
int_fast32_t one = 1;
int_fast32_t halfmaxval = one << (32 - 2);
int_fast32_t maxval = halfmaxval - 1 + halfmaxval;
int_fast32_t minval = -1 - maxval;
result = codep[0] & 0x7f;
for (i = 1; i < 4; ++i)
result = (result << 8) | (codep[i] & 0xff);
if (codep[0] & 0x80) {
result -= !TWOS_COMPLEMENT(int_fast32_t) && result != 0;
result += minval;
}
return result;
}
static int_fast64_t
detzcode64(const char *const codep)
{
register int_fast64_t result;
register int i;
int_fast64_t one = 1;
int_fast64_t halfmaxval = one << (64 - 2);
int_fast64_t maxval = halfmaxval - 1 + halfmaxval;
int_fast64_t minval = -TWOS_COMPLEMENT(int_fast64_t) - maxval;
result = codep[0] & 0x7f;
for (i = 1; i < 8; ++i)
result = (result << 8) | (codep[i] & 0xff);
if (codep[0] & 0x80) {
result -= !TWOS_COMPLEMENT(int_fast64_t) && result != 0;
result += minval;
}
return result;
}
static void
update_tzname_etc(struct state const *sp, struct ttinfo const *ttisp)
{
#if HAVE_TZNAME
tzname[ttisp->tt_isdst] = (char *) &sp->chars[ttisp->tt_desigidx];
#endif
#if USG_COMPAT
if (!ttisp->tt_isdst)
timezone = - ttisp->tt_utoff;
#endif
#if ALTZONE
if (ttisp->tt_isdst)
altzone = - ttisp->tt_utoff;
#endif
}
static void
settzname(void)
{
register struct state * const sp = lclptr;
register int i;
#if HAVE_TZNAME
tzname[0] = tzname[1] = (char *) (sp ? wildabbr : gmt);
#endif
#if USG_COMPAT
daylight = 0;
timezone = 0;
#endif
#if ALTZONE
altzone = 0;
#endif
if (sp == NULL) {
return;
}
for (i = 0; i < sp->typecnt; ++i) {
register const struct ttinfo * const ttisp = &sp->ttis[i];
update_tzname_etc(sp, ttisp);
}
for (i = 0; i < sp->timecnt; ++i) {
register const struct ttinfo * const ttisp =
&sp->ttis[
sp->types[i]];
update_tzname_etc(sp, ttisp);
#if USG_COMPAT
if (ttisp->tt_isdst)
daylight = 1;
#endif
}
}
static void
scrub_abbrs(struct state *sp)
{
int i;
for (i = 0; i < sp->charcnt; ++i)
if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
sp->chars[i] = TZ_ABBR_ERR_CHAR;
for (i = 0; i < sp->typecnt; ++i) {
register const struct ttinfo * const ttisp = &sp->ttis[i];
char *cp = &sp->chars[ttisp->tt_desigidx];
if (strlen(cp) > TZ_ABBR_MAX_LEN &&
strcmp(cp, GRANDPARENTED) != 0)
*(cp + TZ_ABBR_MAX_LEN) = '\0';
}
}
union input_buffer {
struct tzhead tzhead;
char buf[2 * sizeof(struct tzhead) + 2 * sizeof(struct state)
+ 4 * TZ_MAX_TIMES];
};
static char const tzdirslash[sizeof TZDIR] = TZDIR "/";
union local_storage {
struct file_analysis {
union input_buffer u;
struct state st;
} u;
char fullname[BIGGEST(sizeof(struct file_analysis),
sizeof tzdirslash + 1024)];
};
static int
tzloadbody(char const *name, struct state *sp, bool doextend,
union local_storage *lsp)
{
register int i;
register int fid;
register int stored;
register ssize_t nread;
register bool doaccess;
register union input_buffer *up = &lsp->u.u;
register int tzheadsize = sizeof(struct tzhead);
sp->goback = sp->goahead = false;
if (! name) {
name = TZDEFAULT;
if (! name)
return EINVAL;
}
if (name[0] == ':')
++name;
#ifdef SUPPRESS_TZDIR
doaccess = true;
#else
doaccess = name[0] == '/';
#endif
if (!doaccess) {
char const *dot;
size_t namelen = strlen(name);
if (sizeof lsp->fullname - sizeof tzdirslash <= namelen)
return ENAMETOOLONG;
memcpy(lsp->fullname, tzdirslash, sizeof tzdirslash);
strcpy(lsp->fullname + sizeof tzdirslash, name);
for (dot = name; (dot = strchr(dot, '.')); dot++)
if ((dot == name || dot[-1] == '/') && dot[1] == '.'
&& (dot[2] == '/' || !dot[2])) {
doaccess = true;
break;
}
name = lsp->fullname;
}
if (doaccess && access(name, R_OK) != 0)
return errno;
fid = open(name, OPEN_MODE);
if (fid < 0)
return errno;
nread = read(fid, up->buf, sizeof up->buf);
if (nread < tzheadsize) {
int err = nread < 0 ? errno : EINVAL;
close(fid);
return err;
}
if (close(fid) < 0)
return errno;
for (stored = 4; stored <= 8; stored *= 2) {
char version = up->tzhead.tzh_version[0];
bool skip_datablock = stored == 4 && version;
int_fast32_t datablock_size;
int_fast32_t ttisstdcnt = detzcode(up->tzhead.tzh_ttisstdcnt);
int_fast32_t ttisutcnt = detzcode(up->tzhead.tzh_ttisutcnt);
int_fast64_t prevtr = -1;
int_fast32_t prevcorr;
int_fast32_t leapcnt = detzcode(up->tzhead.tzh_leapcnt);
int_fast32_t timecnt = detzcode(up->tzhead.tzh_timecnt);
int_fast32_t typecnt = detzcode(up->tzhead.tzh_typecnt);
int_fast32_t charcnt = detzcode(up->tzhead.tzh_charcnt);
char const *p = up->buf + tzheadsize;
if (! (0 <= leapcnt && leapcnt < TZ_MAX_LEAPS
&& 0 <= typecnt && typecnt < TZ_MAX_TYPES
&& 0 <= timecnt && timecnt < TZ_MAX_TIMES
&& 0 <= charcnt && charcnt < TZ_MAX_CHARS
&& 0 <= ttisstdcnt && ttisstdcnt < TZ_MAX_TYPES
&& 0 <= ttisutcnt && ttisutcnt < TZ_MAX_TYPES))
return EINVAL;
datablock_size
= (timecnt * stored
+ timecnt
+ typecnt * 6
+ charcnt
+ leapcnt * (stored + 4)
+ ttisstdcnt
+ ttisutcnt);
if (nread < tzheadsize + datablock_size)
return EINVAL;
if (skip_datablock)
p += datablock_size;
else {
if (! ((ttisstdcnt == typecnt || ttisstdcnt == 0)
&& (ttisutcnt == typecnt || ttisutcnt == 0)))
return EINVAL;
sp->leapcnt = leapcnt;
sp->timecnt = timecnt;
sp->typecnt = typecnt;
sp->charcnt = charcnt;
timecnt = 0;
for (i = 0; i < sp->timecnt; ++i) {
int_fast64_t at
= stored == 4 ? detzcode(p) : detzcode64(p);
sp->types[i] = at <= TIME_T_MAX;
if (sp->types[i]) {
time_t attime
= ((TYPE_SIGNED(time_t) ? at < TIME_T_MIN : at < 0)
? TIME_T_MIN : at);
if (timecnt && attime <= sp->ats[timecnt - 1]) {
if (attime < sp->ats[timecnt - 1])
return EINVAL;
sp->types[i - 1] = 0;
timecnt--;
}
sp->ats[timecnt++] = attime;
}
p += stored;
}
timecnt = 0;
for (i = 0; i < sp->timecnt; ++i) {
unsigned char typ = *p++;
if (sp->typecnt <= typ)
return EINVAL;
if (sp->types[i])
sp->types[timecnt++] = typ;
}
sp->timecnt = timecnt;
for (i = 0; i < sp->typecnt; ++i) {
register struct ttinfo * ttisp;
unsigned char isdst, desigidx;
ttisp = &sp->ttis[i];
ttisp->tt_utoff = detzcode(p);
p += 4;
isdst = *p++;
if (! (isdst < 2))
return EINVAL;
ttisp->tt_isdst = isdst;
desigidx = *p++;
if (! (desigidx < sp->charcnt))
return EINVAL;
ttisp->tt_desigidx = desigidx;
}
for (i = 0; i < sp->charcnt; ++i)
sp->chars[i] = *p++;
memset(&sp->chars[i], 0, CHARS_EXTRA);
leapcnt = 0;
for (i = 0; i < sp->leapcnt; ++i) {
int_fast64_t tr = stored == 4 ? detzcode(p) : detzcode64(p);
int_fast32_t corr = detzcode(p + stored);
p += stored + 4;
if (tr <= prevtr)
return EINVAL;
if (! (i == 0
|| (prevcorr < corr
? corr == prevcorr + 1
: (corr == prevcorr
|| corr == prevcorr - 1))))
return EINVAL;
prevtr = tr;
prevcorr = corr;
if (tr <= TIME_T_MAX) {
sp->lsis[leapcnt].ls_trans = tr;
sp->lsis[leapcnt].ls_corr = corr;
leapcnt++;
}
}
sp->leapcnt = leapcnt;
for (i = 0; i < sp->typecnt; ++i) {
register struct ttinfo * ttisp;
ttisp = &sp->ttis[i];
if (ttisstdcnt == 0)
ttisp->tt_ttisstd = false;
else {
if (*p != true && *p != false)
return EINVAL;
ttisp->tt_ttisstd = *p++;
}
}
for (i = 0; i < sp->typecnt; ++i) {
register struct ttinfo * ttisp;
ttisp = &sp->ttis[i];
if (ttisutcnt == 0)
ttisp->tt_ttisut = false;
else {
if (*p != true && *p != false)
return EINVAL;
ttisp->tt_ttisut = *p++;
}
}
}
nread -= p - up->buf;
memmove(up->buf, p, nread);
if (!version)
break;
}
if (doextend && nread > 2 &&
up->buf[0] == '\n' && up->buf[nread - 1] == '\n' &&
sp->typecnt + 2 <= TZ_MAX_TYPES) {
struct state *ts = &lsp->u.st;
up->buf[nread - 1] = '\0';
if (tzparse(&up->buf[1], ts, sp)) {
int gotabbr = 0;
int charcnt = sp->charcnt;
for (i = 0; i < ts->typecnt; i++) {
char *tsabbr = ts->chars + ts->ttis[i].tt_desigidx;
int j;
for (j = 0; j < charcnt; j++)
if (strcmp(sp->chars + j, tsabbr) == 0) {
ts->ttis[i].tt_desigidx = j;
gotabbr++;
break;
}
if (! (j < charcnt)) {
int tsabbrlen = strlen(tsabbr);
if (j + tsabbrlen < TZ_MAX_CHARS) {
strcpy(sp->chars + j, tsabbr);
charcnt = j + tsabbrlen + 1;
ts->ttis[i].tt_desigidx = j;
gotabbr++;
}
}
}
if (gotabbr == ts->typecnt) {
sp->charcnt = charcnt;
while (1 < sp->timecnt
&& (sp->types[sp->timecnt - 1]
== sp->types[sp->timecnt - 2]))
sp->timecnt--;
for (i = 0;
i < ts->timecnt && sp->timecnt < TZ_MAX_TIMES;
i++) {
time_t t = ts->ats[i];
if (increment_overflow_time(&t, leapcorr(sp, t))
|| (0 < sp->timecnt
&& t <= sp->ats[sp->timecnt - 1]))
continue;
sp->ats[sp->timecnt] = t;
sp->types[sp->timecnt] = (sp->typecnt
+ ts->types[i]);
sp->timecnt++;
}
for (i = 0; i < ts->typecnt; i++)
sp->ttis[sp->typecnt++] = ts->ttis[i];
}
}
}
if (sp->typecnt == 0)
return EINVAL;
if (sp->timecnt > 1) {
if (sp->ats[0] <= TIME_T_MAX - SECSPERREPEAT) {
time_t repeatat = sp->ats[0] + SECSPERREPEAT;
int repeattype = sp->types[0];
for (i = 1; i < sp->timecnt; ++i)
if (sp->ats[i] == repeatat
&& typesequiv(sp, sp->types[i], repeattype)) {
sp->goback = true;
break;
}
}
if (TIME_T_MIN + SECSPERREPEAT <= sp->ats[sp->timecnt - 1]) {
time_t repeatat = sp->ats[sp->timecnt - 1] - SECSPERREPEAT;
int repeattype = sp->types[sp->timecnt - 1];
for (i = sp->timecnt - 2; i >= 0; --i)
if (sp->ats[i] == repeatat
&& typesequiv(sp, sp->types[i], repeattype)) {
sp->goahead = true;
break;
}
}
}
for (i = 0; i < sp->timecnt; ++i)
if (sp->types[i] == 0)
break;
i = i < sp->timecnt && ! ttunspecified(sp, 0) ? -1 : 0;
if (i < 0 && sp->timecnt > 0 && sp->ttis[sp->types[0]].tt_isdst) {
i = sp->types[0];
while (--i >= 0)
if (!sp->ttis[i].tt_isdst)
break;
}
if (i < 0) {
i = 0;
while (sp->ttis[i].tt_isdst)
if (++i >= sp->typecnt) {
i = 0;
break;
}
}
sp->defaulttype = i;
return 0;
}
static int
tzload(char const *name, struct state *sp, bool doextend)
{
#ifdef ALL_STATE
union local_storage *lsp = malloc(sizeof *lsp);
if (!lsp) {
return HAVE_MALLOC_ERRNO ? errno : ENOMEM;
} else {
int err = tzloadbody(name, sp, doextend, lsp);
free(lsp);
return err;
}
#else
union local_storage ls;
return tzloadbody(name, sp, doextend, &ls);
#endif
}
static bool
typesequiv(const struct state *sp, int a, int b)
{
register bool result;
if (sp == NULL ||
a < 0 || a >= sp->typecnt ||
b < 0 || b >= sp->typecnt)
result = false;
else {
register const struct ttinfo * ap = &sp->ttis[a];
register const struct ttinfo * bp = &sp->ttis[b];
result = (ap->tt_utoff == bp->tt_utoff
&& ap->tt_isdst == bp->tt_isdst
&& ap->tt_ttisstd == bp->tt_ttisstd
&& ap->tt_ttisut == bp->tt_ttisut
&& (strcmp(&sp->chars[ap->tt_desigidx],
&sp->chars[bp->tt_desigidx])
== 0));
}
return result;
}
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 bool
is_digit(char c)
{
return '0' <= c && c <= '9';
}
static ATTRIBUTE_PURE const char *
getzname(register const char *strp)
{
register char c;
while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
c != '+')
++strp;
return strp;
}
static ATTRIBUTE_PURE const char *
getqzname(register const char *strp, const int delim)
{
register int c;
while ((c = *strp) != '\0' && c != delim)
++strp;
return strp;
}
static const char *
getnum(register const char *strp, int *const nump, const int min, const int max)
{
register char c;
register 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 *
getsecs(register const char *strp, int_fast32_t *const secsp)
{
int num;
int_fast32_t secsperhour = SECSPERHOUR;
strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
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);
if (strp == NULL)
return NULL;
*secsp += num;
}
}
return strp;
}
static const char *
getoffset(register const char *strp, int_fast32_t *const offsetp)
{
register bool neg = false;
if (*strp == '-') {
neg = true;
++strp;
} else if (*strp == '+')
++strp;
strp = getsecs(strp, offsetp);
if (strp == NULL)
return NULL;
if (neg)
*offsetp = -*offsetp;
return strp;
}
static const char *
getrule(const char *strp, register struct rule *const rulep)
{
if (*strp == 'J') {
rulep->r_type = JULIAN_DAY;
++strp;
strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
} else if (*strp == 'M') {
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)) {
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 == '/') {
++strp;
strp = getoffset(strp, &rulep->r_time);
} else rulep->r_time = 2 * SECSPERHOUR;
return strp;
}
static int_fast32_t
transtime(const int year, register const struct rule *const rulep,
const int_fast32_t offset)
{
register bool leapyear;
register int_fast32_t value;
register int i;
int d, m1, yy0, yy1, yy2, dow;
leapyear = isleap(year);
switch (rulep->r_type) {
case JULIAN_DAY:
value = (rulep->r_day - 1) * SECSPERDAY;
if (leapyear && rulep->r_day >= 60)
value += SECSPERDAY;
break;
case DAY_OF_YEAR:
value = rulep->r_day * SECSPERDAY;
break;
case MONTH_NTH_DAY_OF_WEEK:
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;
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;
}
value = d * SECSPERDAY;
for (i = 0; i < rulep->r_mon - 1; ++i)
value += mon_lengths[leapyear][i] * SECSPERDAY;
break;
default: UNREACHABLE();
}
return value + rulep->r_time + offset;
}
static bool
tzparse(const char *name, struct state *sp, struct state *basep)
{
const char * stdname;
const char * dstname;
size_t stdlen;
size_t dstlen;
size_t charcnt;
int_fast32_t stdoffset;
int_fast32_t dstoffset;
register char * cp;
register bool load_ok;
time_t atlo = TIME_T_MIN, leaplo = TIME_T_MIN;
stdname = name;
if (*name == '<') {
name++;
stdname = name;
name = getqzname(name, '>');
if (*name != '>')
return false;
stdlen = name - stdname;
name++;
} else {
name = getzname(name);
stdlen = name - stdname;
}
if (!stdlen)
return false;
name = getoffset(name, &stdoffset);
if (name == NULL)
return false;
charcnt = stdlen + 1;
if (sizeof sp->chars < charcnt)
return false;
if (basep) {
if (0 < basep->timecnt)
atlo = basep->ats[basep->timecnt - 1];
load_ok = false;
sp->leapcnt = basep->leapcnt;
memcpy(sp->lsis, basep->lsis, sp->leapcnt * sizeof *sp->lsis);
} else {
load_ok = tzload(TZDEFRULES, sp, false) == 0;
if (!load_ok)
sp->leapcnt = 0;
}
if (0 < sp->leapcnt)
leaplo = sp->lsis[sp->leapcnt - 1].ls_trans;
if (*name != '\0') {
if (*name == '<') {
dstname = ++name;
name = getqzname(name, '>');
if (*name != '>')
return false;
dstlen = name - dstname;
name++;
} else {
dstname = name;
name = getzname(name);
dstlen = name - dstname;
}
if (!dstlen)
return false;
charcnt += dstlen + 1;
if (sizeof sp->chars < charcnt)
return false;
if (*name != '\0' && *name != ',' && *name != ';') {
name = getoffset(name, &dstoffset);
if (name == NULL)
return false;
} else dstoffset = stdoffset - SECSPERHOUR;
if (*name == '\0' && !load_ok)
name = TZDEFRULESTRING;
if (*name == ',' || *name == ';') {
struct rule start;
struct rule end;
register int year;
register int timecnt;
time_t janfirst;
int_fast32_t janoffset = 0;
int yearbeg, yearlim;
++name;
if ((name = getrule(name, &start)) == NULL)
return false;
if (*name++ != ',')
return false;
if ((name = getrule(name, &end)) == NULL)
return false;
if (*name != '\0')
return false;
sp->typecnt = 2;
init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
init_ttinfo(&sp->ttis[1], -dstoffset, true, stdlen + 1);
sp->defaulttype = 0;
timecnt = 0;
janfirst = 0;
yearbeg = EPOCH_YEAR;
do {
int_fast32_t yearsecs
= year_lengths[isleap(yearbeg - 1)] * SECSPERDAY;
yearbeg--;
if (increment_overflow_time(&janfirst, -yearsecs)) {
janoffset = -yearsecs;
break;
}
} while (atlo < janfirst
&& EPOCH_YEAR - YEARSPERREPEAT / 2 < yearbeg);
while (true) {
int_fast32_t yearsecs
= year_lengths[isleap(yearbeg)] * SECSPERDAY;
int yearbeg1 = yearbeg;
time_t janfirst1 = janfirst;
if (increment_overflow_time(&janfirst1, yearsecs)
|| increment_overflow(&yearbeg1, 1)
|| atlo <= janfirst1)
break;
yearbeg = yearbeg1;
janfirst = janfirst1;
}
yearlim = yearbeg;
if (increment_overflow(&yearlim, YEARSPERREPEAT + 1))
yearlim = INT_MAX;
for (year = yearbeg; 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);
bool reversed = endtime < starttime;
if (reversed) {
int_fast32_t swap = starttime;
starttime = endtime;
endtime = swap;
}
if (reversed
|| (starttime < endtime
&& endtime - starttime < yearsecs)) {
if (TZ_MAX_TIMES - 2 < timecnt)
break;
sp->ats[timecnt] = janfirst;
if (! increment_overflow_time
(&sp->ats[timecnt],
janoffset + starttime)
&& atlo <= sp->ats[timecnt])
sp->types[timecnt++] = !reversed;
sp->ats[timecnt] = janfirst;
if (! increment_overflow_time
(&sp->ats[timecnt],
janoffset + endtime)
&& atlo <= sp->ats[timecnt]) {
sp->types[timecnt++] = reversed;
}
}
if (endtime < leaplo) {
yearlim = year;
if (increment_overflow(&yearlim,
YEARSPERREPEAT + 1))
yearlim = INT_MAX;
}
if (increment_overflow_time
(&janfirst, janoffset + yearsecs))
break;
janoffset = 0;
}
sp->timecnt = timecnt;
if (! timecnt) {
sp->ttis[0] = sp->ttis[1];
sp->typecnt = 1;
} else if (YEARSPERREPEAT < year - yearbeg)
sp->goback = sp->goahead = true;
} else {
register int_fast32_t theirstdoffset;
register int_fast32_t theirdstoffset;
register int_fast32_t theiroffset;
register bool isdst;
register int i;
register int j;
if (*name != '\0')
return false;
theirstdoffset = 0;
for (i = 0; i < sp->timecnt; ++i) {
j = sp->types[i];
if (!sp->ttis[j].tt_isdst) {
theirstdoffset =
- sp->ttis[j].tt_utoff;
break;
}
}
theirdstoffset = 0;
for (i = 0; i < sp->timecnt; ++i) {
j = sp->types[i];
if (sp->ttis[j].tt_isdst) {
theirdstoffset =
- sp->ttis[j].tt_utoff;
break;
}
}
isdst = false;
for (i = 0; i < sp->timecnt; ++i) {
j = sp->types[i];
sp->types[i] = sp->ttis[j].tt_isdst;
if (sp->ttis[j].tt_ttisut) {
} else {
if (isdst && !sp->ttis[j].tt_ttisstd) {
sp->ats[i] += dstoffset -
theirdstoffset;
} else {
sp->ats[i] += stdoffset -
theirstdoffset;
}
}
theiroffset = -sp->ttis[j].tt_utoff;
if (sp->ttis[j].tt_isdst)
theirdstoffset = theiroffset;
else theirstdoffset = theiroffset;
}
init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
init_ttinfo(&sp->ttis[1], -dstoffset, true, stdlen + 1);
sp->typecnt = 2;
sp->defaulttype = 0;
}
} else {
dstlen = 0;
sp->typecnt = 1;
sp->timecnt = 0;
init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
sp->defaulttype = 0;
}
sp->charcnt = charcnt;
cp = sp->chars;
memcpy(cp, stdname, stdlen);
cp += stdlen;
*cp++ = '\0';
if (dstlen != 0) {
memcpy(cp, dstname, dstlen);
*(cp + dstlen) = '\0';
}
return true;
}
static void
gmtload(struct state *const sp)
{
if (tzload(gmt, sp, true) != 0)
tzparse("GMT0", sp, NULL);
}
static int
zoneinit(struct state *sp, char const *name)
{
if (name && ! name[0]) {
sp->leapcnt = 0;
sp->timecnt = 0;
sp->typecnt = 0;
sp->charcnt = 0;
sp->goback = sp->goahead = false;
init_ttinfo(&sp->ttis[0], 0, false, 0);
strcpy(sp->chars, gmt);
sp->defaulttype = 0;
return 0;
} else {
int err = tzload(name, sp, true);
if (err != 0 && name && name[0] != ':' && tzparse(name, sp, NULL))
err = 0;
if (err == 0)
scrub_abbrs(sp);
return err;
}
}
static void
tzset_unlocked(void)
{
char const *name = getenv("TZ");
struct state *sp = lclptr;
int lcl = name ? strlen(name) < sizeof lcl_TZname : -1;
if (lcl < 0
? lcl_is_set < 0
: 0 < lcl_is_set && strcmp(lcl_TZname, name) == 0)
return;
#ifdef ALL_STATE
if (! sp)
lclptr = sp = malloc(sizeof *lclptr);
#endif
if (sp) {
if (zoneinit(sp, name) != 0)
zoneinit(sp, "");
if (0 < lcl)
strcpy(lcl_TZname, name);
}
settzname();
lcl_is_set = lcl;
}
void
tzset(void)
{
if (lock() != 0)
return;
tzset_unlocked();
unlock();
}
static void
gmtcheck(void)
{
static bool gmt_is_set;
if (lock() != 0)
return;
if (! gmt_is_set) {
#ifdef ALL_STATE
gmtptr = malloc(sizeof *gmtptr);
#endif
if (gmtptr)
gmtload(gmtptr);
gmt_is_set = true;
}
unlock();
}
#if NETBSD_INSPIRED
timezone_t
tzalloc(char const *name)
{
timezone_t sp = malloc(sizeof *sp);
if (sp) {
int err = zoneinit(sp, name);
if (err != 0) {
free(sp);
errno = err;
return NULL;
}
} else if (!HAVE_MALLOC_ERRNO)
errno = ENOMEM;
return sp;
}
void
tzfree(timezone_t sp)
{
free(sp);
}
#endif
static struct tm *
localsub(struct state const *sp, time_t const *timep, int_fast32_t setname,
struct tm *const tmp)
{
register const struct ttinfo * ttisp;
register int i;
register struct tm * result;
const time_t t = *timep;
if (sp == NULL) {
return gmtsub(gmtptr, timep, 0, tmp);
}
if ((sp->goback && t < sp->ats[0]) ||
(sp->goahead && t > sp->ats[sp->timecnt - 1])) {
time_t newt;
register time_t seconds;
register time_t years;
if (t < sp->ats[0])
seconds = sp->ats[0] - t;
else seconds = t - sp->ats[sp->timecnt - 1];
--seconds;
years = seconds / SECSPERREPEAT * YEARSPERREPEAT;
seconds = years * AVGSECSPERYEAR;
years += YEARSPERREPEAT;
if (t < sp->ats[0])
newt = t + seconds + SECSPERREPEAT;
else
newt = t - seconds - SECSPERREPEAT;
if (newt < sp->ats[0] ||
newt > sp->ats[sp->timecnt - 1])
return NULL;
result = localsub(sp, &newt, setname, tmp);
if (result) {
register int_fast64_t newy;
newy = result->tm_year;
if (t < sp->ats[0])
newy -= years;
else newy += years;
if (! (INT_MIN <= newy && newy <= INT_MAX))
return NULL;
result->tm_year = newy;
}
return result;
}
if (sp->timecnt == 0 || t < sp->ats[0]) {
i = sp->defaulttype;
} else {
register int lo = 1;
register int hi = sp->timecnt;
while (lo < hi) {
register int mid = (lo + hi) >> 1;
if (t < sp->ats[mid])
hi = mid;
else lo = mid + 1;
}
i = sp->types[lo - 1];
}
ttisp = &sp->ttis[i];
result = timesub(&t, ttisp->tt_utoff, sp, tmp);
if (result) {
result->tm_isdst = ttisp->tt_isdst;
#ifdef TM_ZONE
result->TM_ZONE = (char *) &sp->chars[ttisp->tt_desigidx];
#endif
if (setname)
update_tzname_etc(sp, ttisp);
}
return result;
}
#if NETBSD_INSPIRED
struct tm *
localtime_rz(struct state *sp, time_t const *timep, struct tm *tmp)
{
return localsub(sp, timep, 0, tmp);
}
#endif
static struct tm *
localtime_tzset(time_t const *timep, struct tm *tmp, bool setname)
{
int err = lock();
if (err) {
errno = err;
return NULL;
}
if (setname || !lcl_is_set)
tzset_unlocked();
tmp = localsub(lclptr, timep, setname, tmp);
unlock();
return tmp;
}
struct tm *
localtime(const time_t *timep)
{
return localtime_tzset(timep, &tm, true);
}
struct tm *
localtime_r(const time_t *timep, struct tm *tmp)
{
return localtime_tzset(timep, tmp, false);
}
static struct tm *
gmtsub(struct state const *sp, time_t const *timep, int_fast32_t offset,
struct tm *tmp)
{
register struct tm * result;
result = timesub(timep, offset, gmtptr, tmp);
#ifdef TM_ZONE
tmp->TM_ZONE = ((char *)
(offset ? wildabbr : gmtptr ? gmtptr->chars : gmt));
#endif
return result;
}
struct tm *
gmtime_r(const time_t *timep, struct tm *tmp)
{
gmtcheck();
return gmtsub(gmtptr, timep, 0, tmp);
}
struct tm *
gmtime(const time_t *timep)
{
return gmtime_r(timep, &tm);
}
#ifdef STD_INSPIRED
struct tm *
offtime(const time_t *timep, long offset)
{
gmtcheck();
return gmtsub(gmtptr, timep, offset, &tm);
}
#endif
static time_t
leaps_thru_end_of_nonneg(time_t y)
{
return y / 4 - y / 100 + y / 400;
}
static time_t
leaps_thru_end_of(time_t y)
{
return (y < 0
? -1 - leaps_thru_end_of_nonneg(-1 - y)
: leaps_thru_end_of_nonneg(y));
}
static struct tm *
timesub(const time_t *timep, int_fast32_t offset,
const struct state *sp, struct tm *tmp)
{
register const struct lsinfo * lp;
register time_t tdays;
register const int * ip;
register int_fast32_t corr;
register int i;
int_fast32_t idays, rem, dayoff, dayrem;
time_t y;
time_t secs_since_posleap = SECSPERMIN;
corr = 0;
i = (sp == NULL) ? 0 : sp->leapcnt;
while (--i >= 0) {
lp = &sp->lsis[i];
if (*timep >= lp->ls_trans) {
corr = lp->ls_corr;
if ((i == 0 ? 0 : lp[-1].ls_corr) < corr)
secs_since_posleap = *timep - lp->ls_trans;
break;
}
}
tdays = *timep / SECSPERDAY;
rem = *timep % SECSPERDAY;
rem += offset % SECSPERDAY - corr % SECSPERDAY + 3 * SECSPERDAY;
dayoff = offset / SECSPERDAY - corr / SECSPERDAY + rem / SECSPERDAY - 3;
rem %= SECSPERDAY;
dayrem = tdays % DAYSPERREPEAT;
dayrem += dayoff % DAYSPERREPEAT;
y = (EPOCH_YEAR - YEARSPERREPEAT
+ ((1 + dayoff / DAYSPERREPEAT + dayrem / DAYSPERREPEAT
- ((dayrem % DAYSPERREPEAT) < 0)
+ tdays / DAYSPERREPEAT)
* YEARSPERREPEAT));
idays = tdays % DAYSPERREPEAT;
idays += dayoff % DAYSPERREPEAT + 2 * DAYSPERREPEAT;
idays %= DAYSPERREPEAT;
while (year_lengths[isleap(y)] <= idays) {
int tdelta = idays / DAYSPERLYEAR;
int_fast32_t ydelta = tdelta + !tdelta;
time_t newy = y + ydelta;
register int leapdays;
leapdays = leaps_thru_end_of(newy - 1) -
leaps_thru_end_of(y - 1);
idays -= ydelta * DAYSPERNYEAR;
idays -= leapdays;
y = newy;
}
if (!TYPE_SIGNED(time_t) && y < TM_YEAR_BASE) {
int signed_y = y;
tmp->tm_year = signed_y - TM_YEAR_BASE;
} else if ((!TYPE_SIGNED(time_t) || INT_MIN + TM_YEAR_BASE <= y)
&& y - TM_YEAR_BASE <= INT_MAX)
tmp->tm_year = y - TM_YEAR_BASE;
else {
errno = EOVERFLOW;
return NULL;
}
tmp->tm_yday = idays;
tmp->tm_wday = (TM_WDAY_BASE
+ ((tmp->tm_year % DAYSPERWEEK)
* (DAYSPERNYEAR % DAYSPERWEEK))
+ leaps_thru_end_of(y - 1)
- leaps_thru_end_of(TM_YEAR_BASE - 1)
+ idays);
tmp->tm_wday %= DAYSPERWEEK;
if (tmp->tm_wday < 0)
tmp->tm_wday += DAYSPERWEEK;
tmp->tm_hour = rem / SECSPERHOUR;
rem %= SECSPERHOUR;
tmp->tm_min = rem / SECSPERMIN;
tmp->tm_sec = rem % SECSPERMIN;
tmp->tm_sec += secs_since_posleap <= tmp->tm_sec;
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 = idays + 1;
tmp->tm_isdst = 0;
#ifdef TM_GMTOFF
tmp->TM_GMTOFF = offset;
#endif
return tmp;
}
char *
ctime(const time_t *timep)
{
struct tm *tmp = localtime(timep);
return tmp ? asctime(tmp) : NULL;
}
char *
ctime_r(const time_t *timep, char *buf)
{
struct tm mytm;
struct tm *tmp = localtime_r(timep, &mytm);
return tmp ? asctime_r(tmp, buf) : NULL;
}
#ifndef WRONG
#define WRONG (-1)
#endif
static bool
increment_overflow(int *ip, int j)
{
register int const i = *ip;
if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i))
return true;
*ip += j;
return false;
}
static bool
increment_overflow32(int_fast32_t *const lp, int const m)
{
register int_fast32_t const l = *lp;
if ((l >= 0) ? (m > INT_FAST32_MAX - l) : (m < INT_FAST32_MIN - l))
return true;
*lp += m;
return false;
}
static bool
increment_overflow_time(time_t *tp, int_fast32_t j)
{
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 bool
normalize_overflow(int *const tensptr, int *const unitsptr, const int base)
{
register int tensdelta;
tensdelta = (*unitsptr >= 0) ?
(*unitsptr / base) :
(-1 - (-1 - *unitsptr) / base);
*unitsptr -= tensdelta * base;
return increment_overflow(tensptr, tensdelta);
}
static bool
normalize_overflow32(int_fast32_t *tensptr, int *unitsptr, int base)
{
register int tensdelta;
tensdelta = (*unitsptr >= 0) ?
(*unitsptr / base) :
(-1 - (-1 - *unitsptr) / base);
*unitsptr -= tensdelta * base;
return increment_overflow32(tensptr, tensdelta);
}
static int
tmcomp(register const struct tm *const atmp,
register const struct tm *const btmp)
{
register int result;
if (atmp->tm_year != btmp->tm_year)
return atmp->tm_year < btmp->tm_year ? -1 : 1;
if ((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
time2sub(struct tm *const tmp,
struct tm *(*funcp)(struct state const *, time_t const *,
int_fast32_t, struct tm *),
struct state const *sp,
const int_fast32_t offset,
bool *okayp,
bool do_norm_secs)
{
register int dir;
register int i, j;
register int saved_seconds;
register int_fast32_t li;
register time_t lo;
register time_t hi;
int_fast32_t y;
time_t newt;
time_t t;
struct tm yourtm, mytm;
*okayp = false;
yourtm = *tmp;
if (do_norm_secs) {
if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec,
SECSPERMIN))
return WRONG;
}
if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
return WRONG;
if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
return WRONG;
y = yourtm.tm_year;
if (normalize_overflow32(&y, &yourtm.tm_mon, MONSPERYEAR))
return WRONG;
if (increment_overflow32(&y, TM_YEAR_BASE))
return WRONG;
while (yourtm.tm_mday <= 0) {
if (increment_overflow32(&y, -1))
return WRONG;
li = y + (1 < yourtm.tm_mon);
yourtm.tm_mday += year_lengths[isleap(li)];
}
while (yourtm.tm_mday > DAYSPERLYEAR) {
li = y + (1 < yourtm.tm_mon);
yourtm.tm_mday -= year_lengths[isleap(li)];
if (increment_overflow32(&y, 1))
return WRONG;
}
for ( ; ; ) {
i = mon_lengths[isleap(y)][yourtm.tm_mon];
if (yourtm.tm_mday <= i)
break;
yourtm.tm_mday -= i;
if (++yourtm.tm_mon >= MONSPERYEAR) {
yourtm.tm_mon = 0;
if (increment_overflow32(&y, 1))
return WRONG;
}
}
if (increment_overflow32(&y, -TM_YEAR_BASE))
return WRONG;
if (! (INT_MIN <= y && y <= INT_MAX))
return WRONG;
yourtm.tm_year = y;
if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN)
saved_seconds = 0;
else if (y + TM_YEAR_BASE < EPOCH_YEAR) {
if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
return WRONG;
saved_seconds = yourtm.tm_sec;
yourtm.tm_sec = SECSPERMIN - 1;
} else {
saved_seconds = yourtm.tm_sec;
yourtm.tm_sec = 0;
}
lo = TIME_T_MIN;
hi = TIME_T_MAX;
for ( ; ; ) {
t = lo / 2 + hi / 2;
if (t < lo)
t = lo;
else if (t > hi)
t = hi;
if (! funcp(sp, &t, offset, &mytm)) {
dir = (t > 0) ? 1 : -1;
} else dir = tmcomp(&mytm, &yourtm);
if (dir != 0) {
if (t == lo) {
if (t == TIME_T_MAX)
return WRONG;
++t;
++lo;
} else if (t == hi) {
if (t == TIME_T_MIN)
return WRONG;
--t;
--hi;
}
if (lo > hi)
return WRONG;
if (dir > 0)
hi = t;
else lo = t;
continue;
}
#if defined TM_GMTOFF && ! UNINIT_TRAP
if (mytm.TM_GMTOFF != yourtm.TM_GMTOFF
&& (yourtm.TM_GMTOFF < 0
? (-SECSPERDAY <= yourtm.TM_GMTOFF
&& (mytm.TM_GMTOFF <=
(SMALLEST(INT_FAST32_MAX, LONG_MAX)
+ yourtm.TM_GMTOFF)))
: (yourtm.TM_GMTOFF <= SECSPERDAY
&& ((BIGGEST(INT_FAST32_MIN, LONG_MIN)
+ yourtm.TM_GMTOFF)
<= mytm.TM_GMTOFF)))) {
time_t altt = t;
int_fast32_t diff = mytm.TM_GMTOFF - yourtm.TM_GMTOFF;
if (!increment_overflow_time(&altt, diff)) {
struct tm alttm;
if (funcp(sp, &altt, offset, &alttm)
&& alttm.tm_isdst == mytm.tm_isdst
&& alttm.TM_GMTOFF == yourtm.TM_GMTOFF
&& tmcomp(&alttm, &yourtm) == 0) {
t = altt;
mytm = alttm;
}
}
}
#endif
if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
break;
if (sp == NULL)
return WRONG;
for (i = sp->typecnt - 1; i >= 0; --i) {
if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
continue;
for (j = sp->typecnt - 1; j >= 0; --j) {
if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
continue;
if (ttunspecified(sp, j))
continue;
newt = (t + sp->ttis[j].tt_utoff
- sp->ttis[i].tt_utoff);
if (! funcp(sp, &newt, offset, &mytm))
continue;
if (tmcomp(&mytm, &yourtm) != 0)
continue;
if (mytm.tm_isdst != yourtm.tm_isdst)
continue;
t = newt;
goto label;
}
}
return WRONG;
}
label:
newt = t + saved_seconds;
if ((newt < t) != (saved_seconds < 0))
return WRONG;
t = newt;
if (funcp(sp, &t, offset, tmp))
*okayp = true;
return t;
}
static time_t
time2(struct tm * const tmp,
struct tm *(*funcp)(struct state const *, time_t const *,
int_fast32_t, struct tm *),
struct state const *sp,
const int_fast32_t offset,
bool *okayp)
{
time_t t;
t = time2sub(tmp, funcp, sp, offset, okayp, false);
return *okayp ? t : time2sub(tmp, funcp, sp, offset, okayp, true);
}
static time_t
time1(struct tm *const tmp,
struct tm *(*funcp)(struct state const *, time_t const *,
int_fast32_t, struct tm *),
struct state const *sp,
const int_fast32_t offset)
{
register time_t t;
register int samei, otheri;
register int sameind, otherind;
register int i;
register int nseen;
char seen[TZ_MAX_TYPES];
unsigned char types[TZ_MAX_TYPES];
bool okay;
if (tmp == NULL) {
errno = EINVAL;
return WRONG;
}
if (tmp->tm_isdst > 1)
tmp->tm_isdst = 1;
t = time2(tmp, funcp, sp, offset, &okay);
if (okay)
return t;
if (tmp->tm_isdst < 0)
#ifdef PCTS
tmp->tm_isdst = 0;
#else
return t;
#endif
if (sp == NULL)
return WRONG;
for (i = 0; i < sp->typecnt; ++i)
seen[i] = false;
nseen = 0;
for (i = sp->timecnt - 1; i >= 0; --i)
if (!seen[sp->types[i]] && !ttunspecified(sp, sp->types[i])) {
seen[sp->types[i]] = true;
types[nseen++] = sp->types[i];
}
for (sameind = 0; sameind < nseen; ++sameind) {
samei = types[sameind];
if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
continue;
for (otherind = 0; otherind < nseen; ++otherind) {
otheri = types[otherind];
if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
continue;
tmp->tm_sec += (sp->ttis[otheri].tt_utoff
- sp->ttis[samei].tt_utoff);
tmp->tm_isdst = !tmp->tm_isdst;
t = time2(tmp, funcp, sp, offset, &okay);
if (okay)
return t;
tmp->tm_sec -= (sp->ttis[otheri].tt_utoff
- sp->ttis[samei].tt_utoff);
tmp->tm_isdst = !tmp->tm_isdst;
}
}
return WRONG;
}
static time_t
mktime_tzname(struct state *sp, struct tm *tmp, bool setname)
{
if (sp)
return time1(tmp, localsub, sp, setname);
else {
gmtcheck();
return time1(tmp, gmtsub, gmtptr, 0);
}
}
#if NETBSD_INSPIRED
time_t
mktime_z(struct state *sp, struct tm *tmp)
{
return mktime_tzname(sp, tmp, false);
}
#endif
time_t
mktime(struct tm *tmp)
{
time_t t;
int err = lock();
if (err) {
errno = err;
return -1;
}
tzset_unlocked();
t = mktime_tzname(lclptr, tmp, true);
unlock();
return t;
}
#ifdef STD_INSPIRED
time_t
timelocal(struct tm *tmp)
{
if (tmp != NULL)
tmp->tm_isdst = -1;
return mktime(tmp);
}
time_t
timegm(struct tm *tmp)
{
return timeoff(tmp, 0);
}
time_t
timeoff(struct tm *tmp, long offset)
{
if (tmp)
tmp->tm_isdst = 0;
gmtcheck();
return time1(tmp, gmtsub, gmtptr, offset);
}
#endif
static int_fast32_t
leapcorr(struct state const *sp, time_t t)
{
register struct lsinfo const * lp;
register int i;
i = sp->leapcnt;
while (--i >= 0) {
lp = &sp->lsis[i];
if (t >= lp->ls_trans)
return lp->ls_corr;
}
return 0;
}
#ifdef STD_INSPIRED
# if NETBSD_INSPIRED
# define NETBSD_INSPIRED_EXTERN
# else
# define NETBSD_INSPIRED_EXTERN static
# endif
NETBSD_INSPIRED_EXTERN time_t
time2posix_z(struct state *sp, time_t t)
{
return t - leapcorr(sp, t);
}
time_t
time2posix(time_t t)
{
int err = lock();
if (err) {
errno = err;
return -1;
}
if (!lcl_is_set)
tzset_unlocked();
if (lclptr)
t = time2posix_z(lclptr, t);
unlock();
return t;
}
NETBSD_INSPIRED_EXTERN time_t
posix2time_z(struct state *sp, time_t t)
{
time_t x;
time_t y;
x = t + leapcorr(sp, t);
y = x - leapcorr(sp, x);
if (y < t) {
do {
x++;
y = x - leapcorr(sp, x);
} while (y < t);
x -= y != t;
} else if (y > t) {
do {
--x;
y = x - leapcorr(sp, x);
} while (y > t);
x += y != t;
}
return x;
}
time_t
posix2time(time_t t)
{
int err = lock();
if (err) {
errno = err;
return -1;
}
if (!lcl_is_set)
tzset_unlocked();
if (lclptr)
t = posix2time_z(lclptr, t);
unlock();
return t;
}
#endif
#if TZ_TIME_T
# if !USG_COMPAT
# define daylight 0
# define timezone 0
# endif
# if !ALTZONE
# define altzone 0
# endif
time_t
time(time_t *p)
{
time_t r = sys_time(0);
if (r != (time_t) -1) {
int_fast32_t offset = EPOCH_LOCAL ? (daylight ? timezone : altzone) : 0;
if (increment_overflow32(&offset, -EPOCH_OFFSET)
|| increment_overflow_time(&r, offset)) {
errno = EOVERFLOW;
r = -1;
}
}
if (p)
*p = r;
return r;
}
#endif