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reactos/lib/sdk/crt/time/ctime.c
Art Yerkes c501d8112c Create a branch for network fixes. 
svn path=/branches/aicom-network-fixes/; revision=34994
2008-08-01 11:32:26 +00:00

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// fix djdir
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
/* This file has been modified by DJ Delorie. These modifications are
** Copyright (C) 1995 DJ Delorie, 24 Kirsten Ave, Rochester NH,
** 03867-2954, USA.
*/
/*
* Copyright (c) 1987, 1989 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 are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
** Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu).
** POSIX-style TZ environment variable handling from Guy Harris
** (guy@auspex.com).
*/
#include <precomp.h>
#include "tzfile.h"
#include "posixrul.h"
#ifdef __cplusplus
#define CPP_CONST const
#else
#define CPP_CONST
#endif
#undef P
#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
#define ACCESS_MODE O_RDONLY|O_BINARY
#define OPEN_MODE O_RDONLY|O_BINARY
/*
** 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).
*/
void _set_daylight_export(int);
void _set_timezone_export(int);
/* buffers must hold 64 characters! */
static char TZ_NAME[64] = "PST";
static char TZ_DST_NAME[64] = "PDT";
#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.
*/
#if 0
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)(const time_t * CPP_CONST, const long, struct tm * CPP_CONST), long offset));
static time_t time2 P((struct tm *tmp, void (* funcp)(const time_t * CPP_CONST, const long, struct tm * CPP_CONST), 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));
static void tzsetwall(void);
#else
static const char * getnum(const char * strp, int * CPP_CONST nump, const int min, const int max);
static void timesub(const time_t * CPP_CONST timep, const long offset, const struct state * CPP_CONST sp, struct tm * CPP_CONST tmp);
static time_t transtime(const time_t janfirst, const int year, const struct rule * CPP_CONST rulep, const long offset);
static void tzsetwall(void);
#endif
#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] = {
TZ_NAME,
TZ_DST_NAME,
};
static long
detzcode(const char * CPP_CONST codep)
{
long result;
int i;
result = 0;
for (i = 0; i < 4; ++i)
result = (result << 8) | (codep[i] & 0xff);
return result;
}
static void
settzname(void)
{
const struct state * CPP_CONST sp = lclptr;
int i;
_tzname[0] = TZ_NAME;
_tzname[1] = TZ_DST_NAME;
#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 * CPP_CONST ttisp = &sp->ttis[i];
_tzname[ttisp->tt_isdst] =
(char *)&sp->chars[ttisp->tt_abbrind];
#if 0
if (ttisp->tt_isdst) {
//_daylight = 1;
_set_daylight_export(1);
}
if (i == 0 || !ttisp->tt_isdst) {
//_timezone_dll = -(ttisp->tt_gmtoff);
_set_timezone_export(-(ttisp->tt_gmtoff));
}
if (i == 0 || ttisp->tt_isdst) {
_altzone = -(ttisp->tt_gmtoff);
}
#endif
}
/*
** And to get the latest zone names into tzname. . .
*/
for (i = 0; i < sp->timecnt; ++i)
{
const struct ttinfo * CPP_CONST ttisp = &sp->ttis[sp->types[i]];
_tzname[ttisp->tt_isdst] = (char *)&sp->chars[ttisp->tt_abbrind];
}
}
static char* tzdir(void)
{
static char dir[80]={0}, *cp;
if (dir[0] == 0)
{
if ((cp = getenv("TZDIR")))
{
strcpy(dir, cp);
}
else if ((cp = getenv("DJDIR")))
{
strcpy(dir, cp);
strcat(dir, "/zoneinfo");
}
else
strcpy(dir, "./");
}
return dir;
}
static int tzload(const char* name, struct state* CPP_CONST sp)
{
const char * p;
int i;
int fid;
char fullname[FILENAME_MAX + 1];
const struct tzhead * tzhp;
char buf[sizeof *sp + sizeof *tzhp];
int ttisstdcnt;
if (name == NULL && (name = TZDEFAULT) == NULL)
return -1;
if (name[0] == ':')
++name;
if (name[0] != '/')
{
if ((p = tzdir()) == NULL)
return -1;
if ((strlen(p) + strlen(name) + 1) >= sizeof fullname)
return -1;
strcpy(fullname, p);
strcat(fullname, "/");
strcat(fullname, name);
name = fullname;
}
if ((fid = _open(name, OPEN_MODE)) == -1)
{
const char *base = strrchr(name, '/');
if (base)
base++;
else
base = name;
if (strcmp(base, "posixrules"))
return -1;
/* We've got a built-in copy of posixrules just in case */
memcpy(buf, _posixrules_data, sizeof(_posixrules_data));
i = sizeof(_posixrules_data);
}
else
{
i = _read(fid, buf, sizeof buf);
if (_close(fid) != 0 || i < (int)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 < (int)sizeof *tzhp +
sp->timecnt * (4 + (int)sizeof (char)) +
sp->typecnt * (4 + 2 * (int)sizeof (char)) +
sp->charcnt * (int)sizeof (char) +
sp->leapcnt * 2 * 4 +
ttisstdcnt * (int)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)
{
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)
{
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)
{
struct ttinfo * ttisp;
ttisp = &sp->ttis[i];
if (ttisstdcnt == 0)
ttisp->tt_ttisstd = FALSE;
else
{
ttisp->tt_ttisstd = *p++;
if (ttisp->tt_ttisstd != TRUE &&
ttisp->tt_ttisstd != FALSE)
return -1;
}
}
return 0;
}
static const int mon_lengths[2][MONSPERYEAR] = {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const int year_lengths[2] = {
DAYSPERNYEAR, DAYSPERLYEAR
};
/*
** Given a pointer into a time zone string, scan until a character that is not
** a valid character in a zone name is found. Return a pointer to that
** character.
*/
static const char*
getzname(const char* strp)
{
char c;
while ((c = *strp) != '\0' && !isdigit(c) && c != ',' && c != '-' &&
c != '+')
++strp;
return strp;
}
/*
** Given a pointer into a time zone string, extract a number from that string.
** Check that the number is within a specified range; if it is not, return
** NULL.
** Otherwise, return a pointer to the first character not part of the number.
*/
static const char*
getnum(const char* strp, int* CPP_CONST nump, const int min, const int max)
{
char c;
int num;
if (strp == NULL || !isdigit(*strp))
return NULL;
num = 0;
while ((c = *strp) != '\0' && isdigit(c))
{
num = num * 10 + (c - '0');
if (num > max)
return NULL;
++strp;
}
if (num < min)
return NULL;
*nump = num;
return strp;
}
/*
** Given a pointer into a time zone string, extract a number of seconds,
** in hh[:mm[:ss]] form, from the string.
** If any error occurs, return NULL.
** Otherwise, return a pointer to the first character not part of the number
** of seconds.
*/
static const char *
getsecs(const char *strp, long * CPP_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(const char *strp, long * CPP_CONST offsetp)
{
int neg;
if (*strp == '-')
{
neg = 1;
++strp;
}
else if (isdigit(*strp) || *strp++ == '+')
neg = 0;
else
return NULL; /* illegal offset */
strp = getsecs(strp, offsetp);
if (strp == NULL)
return NULL; /* illegal time */
if (neg)
*offsetp = -*offsetp;
return strp;
}
/*
** Given a pointer into a time zone string, extract a rule in the form
** date[/time]. See POSIX section 8 for the format of "date" and "time".
** If a valid rule is not found, return NULL.
** Otherwise, return a pointer to the first character not part of the rule.
*/
static const char *
getrule(const char *strp, struct rule * CPP_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(const time_t janfirst, const int year, const struct rule * CPP_CONST rulep, const long offset)
{
int leapyear;
time_t value=0;
int i;
int d, m1, yy0, yy1, yy2, dow;
leapyear = isleap(year);
switch (rulep->r_type)
{
case JULIAN_DAY:
/*
** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
** years.
** In non-leap years, or if the day number is 59 or less, just
** add SECSPERDAY times the day number-1 to the time of
** January 1, midnight, to get the day.
*/
value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
if (leapyear && rulep->r_day >= 60)
value += SECSPERDAY;
break;
case DAY_OF_YEAR:
/*
** n - day of year.
** Just add SECSPERDAY times the day number to the time of
** January 1, midnight, to get the day.
*/
value = janfirst + rulep->r_day * SECSPERDAY;
break;
case MONTH_NTH_DAY_OF_WEEK:
/*
** Mm.n.d - nth "dth day" of month m.
*/
value = janfirst;
for (i = 0; i < rulep->r_mon - 1; ++i)
value += mon_lengths[leapyear][i] * SECSPERDAY;
/*
** Use Zeller's Congruence to get day-of-week of first day of
** month.
*/
m1 = (rulep->r_mon + 9) % 12 + 1;
yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
yy1 = yy0 / 100;
yy2 = yy0 % 100;
dow = ((26 * m1 - 2) / 10 +
1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
if (dow < 0)
dow += DAYSPERWEEK;
/*
** "dow" is the day-of-week of the first day of the month. Get
** the day-of-month (zero-origin) of the first "dow" day of the
** month.
*/
d = rulep->r_day - dow;
if (d < 0)
d += DAYSPERWEEK;
for (i = 1; i < rulep->r_week; ++i)
{
if (d + DAYSPERWEEK >=
mon_lengths[leapyear][rulep->r_mon - 1])
break;
d += DAYSPERWEEK;
}
/*
** "d" is the day-of-month (zero-origin) of the day we want.
*/
value += d * SECSPERDAY;
break;
}
/*
** "value" is the Epoch-relative time of 00:00:00 GMT on the day in
** question. To get the Epoch-relative time of the specified local
** time on that day, add the transition time and the current offset
** from GMT.
*/
return value + rulep->r_time + offset;
}
/*
** Given a POSIX section 8-style TZ string, fill in the rule tables as
** appropriate.
*/
static int
tzparse(const char *name, struct state * CPP_CONST sp, const int lastditch)
{
const char * stdname;
const char * dstname=0;
int stdlen;
int dstlen;
long stdoffset;
long dstoffset;
time_t * atp;
unsigned char * typep;
char * cp;
int load_result;
stdname = name;
if (lastditch)
{
stdlen = strlen(name); /* length of standard zone name */
name += stdlen;
if (stdlen >= (int)sizeof sp->chars)
stdlen = (int)(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;
int year;
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;
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)
{
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 > (int)sizeof sp->chars)
return -1;
cp = sp->chars;
(void) strncpy(cp, stdname, stdlen);
cp += stdlen;
*cp++ = '\0';
if (dstlen != 0)
{
(void) strncpy(cp, dstname, dstlen);
*(cp + dstlen) = '\0';
}
return 0;
}
static void
gmtload(struct state * CPP_CONST sp)
{
if (tzload(GMT, sp) != 0)
(void) tzparse(GMT, sp, TRUE);
}
/*
* @implemented
*/
void
_tzset(void)
{
const char * name;
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)
gmtload(lclptr);
settzname();
}
void
tzsetwall(void)
{
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(const time_t * CPP_CONST timep, const long offset, struct tm * CPP_CONST tmp)
{
const struct state * sp;
const struct ttinfo * ttisp;
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];
#if 0
/* tm_zone doesnt exist in windows msvcrt -Gunnar */
tmp->tm_zone = (char *)&sp->chars[ttisp->tt_abbrind];
#endif
}
/*
* @implemented
*/
struct tm *
localtime(const time_t * CPP_CONST timep)
{
static struct tm tm;
localsub(timep, 0L, &tm);
return &tm;
}
/*
** gmtsub is to gmtime as localsub is to localtime.
*/
static void
gmtsub(const time_t * CPP_CONST timep, const long offset, struct tm * CPP_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 0
/* tm_zone doesnt exist in windows msvcrt -Gunnar */
if (offset != 0)
tmp->tm_zone = TZ_NAME;
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 */
}
#endif /* if 0 */
}
/*
* @implemented
*/
struct tm *
gmtime(const time_t * CPP_CONST timep)
{
static struct tm tm;
gmtsub(timep, 0L, &tm);
return &tm;
}
static void
timesub(const time_t * CPP_CONST timep, const long offset, const struct state * CPP_CONST sp, struct tm * CPP_CONST tmp)
{
const struct lsinfo * lp;
long days;
long rem;
int y;
int yleap;
const int * ip;
long corr;
int hit;
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;
#if 0
/* tm_gmtoff doesnt exist in windows msvcrt -Gunnar */
tmp->tm_gmtoff = offset;
#endif
}
/*
** A la X3J11
*/
/*
* @implemented
*/
char *
asctime(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 %02d:%02d:%02d %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;
}
/*
* @implemented
*/
char *
ctime(const time_t * CPP_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(int * CPP_CONST tensptr, int * CPP_CONST unitsptr, const int base)
{
if (*unitsptr >= base)
{
*tensptr += *unitsptr / base;
*unitsptr %= base;
}
else if (*unitsptr < 0)
{
--*tensptr;
*unitsptr += base;
if (*unitsptr < 0)
{
*tensptr -= 1 + (-*unitsptr) / base;
*unitsptr = base - (-*unitsptr) % base;
}
}
}
static int
tmcomp(const struct tm * CPP_CONST atmp, const struct tm * CPP_CONST btmp)
{
int result;
if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
(result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
(result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
(result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
(result = (atmp->tm_min - btmp->tm_min)) == 0)
result = atmp->tm_sec - btmp->tm_sec;
return result;
}
static time_t
time2(struct tm *tmp, void (*const funcp)(const time_t * CPP_CONST, const long, struct tm *), const long offset, int * CPP_CONST okayp)
{
const struct state * sp;
int dir;
int bits;
int i, j ;
int saved_seconds;
time_t newt;
time_t t;
struct tm yourtm, mytm;
*okayp = FALSE;
yourtm = *tmp;
if (yourtm.tm_sec >= SECSPERMIN + 2 || yourtm.tm_sec < 0)
normalize(&yourtm.tm_min, &yourtm.tm_sec, SECSPERMIN);
normalize(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR);
normalize(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY);
normalize(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR);
while (yourtm.tm_mday <= 0)
{
--yourtm.tm_year;
yourtm.tm_mday +=
year_lengths[isleap(yourtm.tm_year + TM_YEAR_BASE)];
}
for ( ; ; )
{
i = mon_lengths[isleap(yourtm.tm_year +
TM_YEAR_BASE)][yourtm.tm_mon];
if (yourtm.tm_mday <= i)
break;
yourtm.tm_mday -= i;
if (++yourtm.tm_mon >= MONSPERYEAR)
{
yourtm.tm_mon = 0;
++yourtm.tm_year;
}
}
saved_seconds = yourtm.tm_sec;
yourtm.tm_sec = 0;
/*
** Calculate the number of magnitude bits in a time_t
** (this works regardless of whether time_t is
** signed or unsigned, though lint complains if unsigned).
*/
for (bits = 0, t = 1; t > 0; ++bits, t <<= 1)
;
/*
** If time_t is signed, then 0 is the median value,
** if time_t is unsigned, then 1 << bits is median.
*/
#ifdef _MSVCRT_LIB_
t = (time_t) ((1 << bits) - 1);
#else // TODO: FIXME: review which is correct
t = (time_t) 1 << bits;
#endif /*_MSVCRT_LIB_*/
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(struct tm * CPP_CONST tmp, void (*const funcp)(const time_t * CPP_CONST, const long, struct tm *), const long offset)
{
time_t t;
const struct state * sp;
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;
}
/*
* @implemented
*/
time_t
mktime(struct tm * tmp)
{
return time1(tmp, localsub, 0L);
}
/*
* @implemented
*/
char **
__p__tzname(void)
{
return _tzname;
}
/*********************************************************************
* _dstbias (MSVCRT.@)
*/
int _dstbias = 0;
/*********************************************************************
* __p_dstbias (MSVCRT.@)
*/
int * __p__dstbias(void)
{
return &_dstbias;
}
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