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time_api.c
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time_api.c
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/*****************************************************************************\
* *
* FILENAME: time_api.c *
* *
* --------------------------------------------------------------------------- *
* *
* DESCRIPTION: Implementation of several time handling functions. *
* *
* --------------------------------------------------------------------------- *
* *
* COPYRIGHT: (c) 2024 Dipl.-Ing. Klaus Lux (Aachen, Germany) *
* *
* --------------------------------------------------------------------------- *
* *
* ORIGIN: https://github/klux21/limitless_times *
* *
* --------------------------------------------------------------------------- *
* *
* Civil Usage Public License, Version 1.1, January 2024 *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are met: *
* *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions, the explanation of terms *
* and the following disclaimer. *
* *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation or other materials provided with the distribution. *
* *
* 3. All modified files must carry prominent notices stating that the *
* files have been changed. *
* *
* 4. The source code and binary forms and any derivative works are not *
* stored or executed in systems or devices which are designed or *
* intended to harm, to kill or to forcibly immobilize people. *
* *
* 5. The source code and binary forms and any derivative works are not *
* stored or executed in systems or devices which are intended to *
* monitor, to track, to change or to control the behavior, the *
* constitution, the location or the communication of any people or *
* their property without the explicit and prior agreement of those *
* people except those devices and systems are solely designed for *
* saving or protecting peoples life or health. *
* *
* 6. The source code and binary forms and any derivative works are not *
* stored or executed in any systems or devices that are intended *
* for the production of any of the systems or devices that *
* have been stated before except the ones for saving or protecting *
* peoples life or health only. *
* *
* The term 'systems' in all clauses shall include all types and combinations *
* of physical, virtualized or simulated hardware and software and any kind *
* of data storage. *
* *
* The term 'devices' shall include any kind of local or non-local control *
* system of the stated devices as part of that device als well. Any assembly *
* of more than one device is one and the same device regarding this license. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" *
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE *
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE *
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN *
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) *
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE *
* POSSIBILITY OF SUCH DAMAGE. *
* *
\*****************************************************************************/
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h> /* open */
#include <stdio.h> /* sprintf */
#include <string.h>
#include <stdlib.h>
#ifdef _WIN32
#pragma warning(disable : 4100 4127)
#include <io.h>
#else
#include <unistd.h>
#include <sys/types.h>
#ifdef __CYGWIN__
#include <windows.h>
#undef _WIN32
#endif
#endif/* #ifdef _WIN32 */
#include <time_api.h>
#include <tz_value.h>
#if defined (_WIN32) || defined (__CYGWIN__)
/* ------------------------------------------------------------------------- *\
unix_time returns the Unix time stamp in microsecond.
(UTC time since 01/01/1970) The precision depends on the system.
\* ------------------------------------------------------------------------- */
static void (WINAPI * vGetSystemTimePreciseAsFileTime)(LPFILETIME lpSystemTimeAsFileTime);
static HMODULE hmKernel32Dll = (HMODULE) -1;
int64_t unix_time()
{
int64_t iRet;
FILETIME CurrentTime;
if(vGetSystemTimePreciseAsFileTime)
{
vGetSystemTimePreciseAsFileTime(&CurrentTime);
}
else if(hmKernel32Dll == (HMODULE) -1)
{ /* 1rst call */
hmKernel32Dll = LoadLibrary("Kernel32.dll");
if(hmKernel32Dll)
vGetSystemTimePreciseAsFileTime = (void (WINAPI * )(LPFILETIME)) GetProcAddress(hmKernel32Dll, "GetSystemTimePreciseAsFileTime");
if(vGetSystemTimePreciseAsFileTime)
vGetSystemTimePreciseAsFileTime(&CurrentTime);
else
GetSystemTimeAsFileTime(&CurrentTime);
}
else
{
GetSystemTimeAsFileTime(&CurrentTime);
}
iRet = ((int64_t) CurrentTime.dwHighDateTime << 32);
iRet += (int64_t) CurrentTime.dwLowDateTime;
iRet -= (int64_t) 116444736 * 1000000 * 1000; /* offset of Windows FileTime to start of Unix time */
return (iRet / 10);
}/* int64_t unix_time() */
#else
int64_t unix_time()
{
int64_t tRet;
struct timeval tv;
gettimeofday(&tv, NULL);
tRet = (int64_t) tv.tv_sec;
/* Try to turn the year 2038 problem into a year 2106 problem. */
if((sizeof(time_t) <= 4) && (tv.tv_sec < 0))
tRet += (int64_t) 0x80000000ul + (int64_t) 0x80000000ul;
tRet *= 1000000ul;
tRet += tv.tv_usec;
return (tRet);
}/* int64_t unix_time() */
#endif
/* ========================================================================= *\
Thread safety helpers
\* ========================================================================= */
/* ------------------------------------------------------------------------- *\
Optional thread lock stuff for ensuring thread safety in multi-threaded
programs. The lock callbacks must be set before calling
update_time_zone_info, new_mktime, get_local_zone_info or new_localtime_r.
The context is a user defined pointer which is uses as argument of the
callbacks. It can be a pointer to a global program mutex for instance.
The provided pfn_lock and pfn_unlock functions are called for guarding
the updates of the internal time zone information updates in
multi-threaded programs but may slow down those functions according to the
time the lock or unlock functions require. For disabling subsequent calls
of the lock and unlock function e.g. before the program termination call
set_time_api_lock with null pointer arguments instead of callback functions.
The used mutex needs to be callable recursively.
Because the function pointers are remembered in static variables you need
to ensure to call this function in all of your program modules which don't
share the same statics and ensure the usage of the same mutex in all of
those modules.
Be aware that the other standard C time functions beside of those
functions aren't required to be thread safe implemented while changing the
global time settings e.g. if changing the TZ environment variable of your
process!
\* ------------------------------------------------------------------------- */
static TIME_API_LOCK pta_lock = NULL;
static TIME_API_LOCK pta_unlock = NULL;
static void * pv_lock_context = NULL;
void init_time_api_lock(TIME_API_LOCK pfn_lock, /* pointer to a user provided mutex lock callback function */
TIME_API_LOCK pfn_unlock, /* pointer to a user provided mutex unlock callback function */
void * pv_context) /* user provided context, e.g. pointer to the mutex. */
{
TIME_API_LOCK old_unlock;
void * old_context;
if(pfn_lock)
pfn_lock(pv_context);
if(pta_lock)
pta_lock(pv_lock_context);
old_context = pv_lock_context;
old_unlock = pta_unlock;
pv_lock_context = pv_context;
pta_lock = pfn_lock;
pta_unlock = pfn_unlock;
if(old_unlock)
old_unlock(old_context);
if(pfn_unlock)
pfn_unlock(pv_context);
} /* void set_time_api_lock(...) */
/* ========================================================================= *\
Routines for calculating calendar week of a given date
\* ========================================================================= */
/* ------------------------------------------------------------------------- *\
calendar_week_of_year returns the calender week of the year for a struct tm
\* ------------------------------------------------------------------------- */
int calendar_week_of_year(const struct tm * ptm)
{
int wday_01_01;
int kw_ret = 0;
int epoch = 0;
int year = 0;
if(!ptm)
goto Exit;
year = ptm->tm_year + 1900;
epoch = year / 400;
if (year < 0)
--epoch;
year -= epoch * 400; /* year is between 0 and 399 now (every 400 years epoch epoch starts on a Saturday) */
/* we have to subtract one because the calendar week starts
on Monday instead on Sunday as in struct ptm specified. */
wday_01_01 = (700 + ptm->tm_wday - ptm->tm_yday - 1) % 7;
if(wday_01_01 >= 4)
wday_01_01 -= 7; /* subtract a week because the 01/01 belongs to KW53 of last year. */
kw_ret = (ptm->tm_yday + wday_01_01 + 7) / 7;
if (kw_ret == 53)
{ /* KW53 is KW1 of next year if the 12/31 isn't a Thursday */
long wday_12_31;
if(!(year & 3) && ((year % 100) || !year))
wday_12_31 = (wday_01_01 + 366) % 7; /* leap year */
else
wday_12_31 = (wday_01_01 + 365) % 7; /* normal year */
if(wday_12_31 < 4)
kw_ret = 1;
}
if(!kw_ret)
kw_ret = 53; /* KW0 indicates KW53 of previous year. */
Exit:;
return (kw_ret);
}/* calendar_week_of_year(...) */
/* ------------------------------------------------------------------------- *\
week_of_year returns the calendar week of a given date
\* ------------------------------------------------------------------------- */
int week_of_year(int year, int month, int day)
{
int kw_ret = 0;
struct tm stm;
time_t timestamp;
memset(&stm, 0, sizeof(stm)); /* clear data */
if((month < 1) || (month > 12))
month = 1;
if((day < 1) || (day > 31))
day = 1;
stm.tm_year = year - 1900;
stm.tm_mon = month - 1;
stm.tm_mday = day;
stm.tm_hour = 11;
timestamp = new_mkgmtime(&stm);
new_gmtime_r(×tamp, &stm);
kw_ret = calendar_week_of_year(&stm);
return (kw_ret);
}/* week_of_year(...) */
/* ------------------------------------------------------------------------- *\
calendar_week_of_time returns the calender week of the year for a time_t
\* ------------------------------------------------------------------------- */
int calendar_week_of_time(time_t tt)
{
int kw_ret = 0;
struct tm stm;
memset(&stm, 0, sizeof(stm));
new_gmtime_r(&tt, &stm);
kw_ret = calendar_week_of_year(&stm);
return (kw_ret);
} /* int calendar_week_of_time(time_t tt) */
/* ------------------------------------------------------------------------- *\
new_mkgmtime is a mkgmtime (timegm) implementation
\* ------------------------------------------------------------------------- */
time_t new_mkgmtime(const struct tm * ptm)
{
int64_t tt = -1;
int64_t year;
int64_t epoch;
int32_t time_of_year;
int leap_year = 0;
if(!ptm)
{
errno = EINVAL;
goto Exit;
}
if ( ((ptm->tm_sec < 0) || (ptm->tm_sec > 60)) /* allow specification of a positive leap second */
|| ((ptm->tm_min < 0) || (ptm->tm_min > 59))
|| ((ptm->tm_hour < 0) || (ptm->tm_hour > 23))
|| (ptm->tm_mday < 1)
|| ((ptm->tm_mon < 0) || (ptm->tm_mon > 11)))
{
errno = ERANGE;
goto Exit;
}
year = (int64_t) ptm->tm_year + 1900;
epoch = year / 400;
if (year < 0)
--epoch;
year -= epoch * 400; /* year is between 0 and 399 now */
tt = epoch * ((int64_t) 146097 * 86400); /* time of the 400 year epochs */
if (year >= 100)
{
if (year >= 300)
{
tt += (int64_t) 86400 * (36525 + 36524 + 36524);
year -= 300;
}
else if (year >= 200)
{
tt += (int64_t) 86400 * (36525 + 36524);
year -= 200;
}
else
{
tt += (int64_t) 86400 * 36525;
year -= 100;
}
if (year >= 4)
{
tt += (int64_t) 86400 * (365 * 4); /* add the time of the first 4 years of the century */
year -= 4;
tt += (year >> 2) * (1461 * 86400); /* time of full four year epochs */
year &= 3;
if(year == 3)
tt += (366 + 365 + 365) * 86400; /* add time till the year */
else if(year == 2)
tt += (366 + 365) * 86400; /* add time till the year */
else if(year == 1)
tt += 366 * 86400; /* add time of the leap year */
else
leap_year = 1;
}
else
{
tt += year * (86400 * 365); /* add the time of the full years */
}
}
else
{
tt += (year >> 2) * (1461 * 86400); /* time of full four year epochs */
year &= 3;
if(year == 3)
tt += (366 + 365 + 365) * 86400; /* add time till the year */
else if(year == 2)
tt += (366 + 365) * 86400; /* add time till the year */
else if(year == 1)
tt += 366 * 86400; /* add time of the leap year */
else
leap_year = 1;
}
if(!leap_year)
{ /* month 1 2 3 4 5 6 7 8 9 10 11 12 */
static const uint8_t days_of_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; /* number of the days in the month */
static const uint16_t startday_of_month[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; /* offset of the first day of a month to the begin of the year that is not a leap year */
if (ptm->tm_mday > days_of_month[ptm->tm_mon])
{
errno = ERANGE;
goto Exit;
}
time_of_year = (startday_of_month[ptm->tm_mon] + (ptm->tm_mday - 1)) * 86400;
}
else
{
static const int8_t days_of_month[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; /* number of the days in the month */
static const int16_t startday_of_month[12] = { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 }; /* offset of the first day of a month from the begin of the year in a leap year */
if (ptm->tm_mday > days_of_month[ptm->tm_mon])
{
errno = ERANGE;
goto Exit;
}
time_of_year = (startday_of_month[ptm->tm_mon] + (ptm->tm_mday - 1)) * 86400;
}
time_of_year += ptm->tm_sec;
time_of_year += ptm->tm_min * 60;
time_of_year += ptm->tm_hour * 3600;
tt += (int64_t) time_of_year;
tt -= (int64_t) 719528 * 86400; /* subtract the time from 1/1/0000 until 1/1/1970 */
if(tt != (time_t) tt)
{ /* handle overflow of 32 bit time_t values */
tt = -1;
errno = ERANGE;
goto Exit;
}
Exit:;
return ((time_t) tt);
} /* time_t new_mkgmtime(struct tm * ptm) */
/* ------------------------------------------------------------------------- *\
new_gmtime_r an own implementation of gmtime_r
Note: new_gmtime_r returns the atronomical date that has a year 0.
If you need the historical date you can do this as following
...
new_gmtime_r(&t, ptm);
if(ptm->year <= -1900)
--ptm->year;
printf ( "The historical year was %s%i%s", ptm->year > -1900 ? "AD" : "",
ptm->year + 1900, ptm->year < -1900 ? " BC" : "");
...
\* ------------------------------------------------------------------------- */
struct tm * new_gmtime_r(const time_t * pt, struct tm * ptm)
{
int64_t time = 0; /* unix time in micro seconds */
int64_t year;
uint32_t day;
uint32_t time_of_day;
uint32_t tmp;
int leap_year = 0;
int ignore_leap_year = 0;
static uint8_t mday[366] = /* day of a month of in a leap year */
{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31};
static uint8_t mon[366] = /* month of a day in a leap year */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11};
if(!ptm)
{
errno = EINVAL;
goto Exit; /* destination missing */
}
if(pt)
time = (int64_t) *pt;
memset(ptm, 0, sizeof(*ptm));
/* ptm->tm_isdst = 0; -> ignore summer time flag for UTC */
time += ((int64_t) 719528 * 86400); /* add the time from 1/1/0000 to 1/1/1970 */
if (time < 0)
year = time / ((int64_t) 146097 * 86400) - 1; /* calculate the number of full 400 year epochs BC */
else
year = time / ((int64_t) 146097 * 86400); /* calculate the number of full 400 year epochs */
time -= year * ((int64_t) 146097 * 86400); /* subtract the 400 year epochs from time */
year *= 400; /* year contains the Gregorian 400 year epoch of the time now e.g 400 for 753 AD */
day = (uint32_t) (time / 86400); /* calculate the days within the epoch */
time_of_day = (uint32_t) (time - (int64_t) day * 86400); /* time of the day in seconds */
ptm->tm_wday = (day + 6 /* 6 is offset at 1.1.0000 */) % 7; /* day of the week the year starts with 0=Sunday ... 6=Saturday */
if (day >= 36525)
{ /* if the time is more than 100 years after the start of a 400 years epoch */
day -= 36525;
year += 100;
if (day >= 36524)
{
day -= 36524;
year += 100;
if (day >= 36524)
{
day -= 36524;
year += 100;
}
}
/* handle the first non leap years at begin of the century and ensure all remaining 4 year epochs start with a leap year */
if (day >= 1460)
{
year += 4;
day -= 1460;
}
else
{
ignore_leap_year = 1; /* we have to ignore the leap year within the first four years of a century */
while (day >= 365)
{
++year;
day -= 365;
}
}
}
/* now we handle the rest of the years */
tmp = (day / 1461); /* calculate the number of full 4 year epochs that start with a leap year */
year += tmp * 4;
day -= tmp * 1461;
if (day >= 1096)
{ /* last year of the remaining 4 year block */
year += 3;
day -= 1096;
}
else if (day >= 731)
{ /* 3rd year of the 4 year block */
year += 2;
day -= 731;
}
else if (day >= 366)
{ /* 2nd year of the 4 year block */
year += 1;
day -= 366;
}
else if (!ignore_leap_year)
{ /* 1rst year of the 4 year block */
leap_year = 1;
}
year -= 1900;
ptm->tm_year = (int) year;
ptm->tm_yday = (int) day;
if (!leap_year && (day >= 59))
++day; /* we have to skip the 29th of February in our tables */
ptm->tm_mon = mon[day];
ptm->tm_mday = mday[day];
ptm->tm_hour = (time_of_day / 3600);
ptm->tm_min = (time_of_day % (3600)) / 60;
ptm->tm_sec = (time_of_day % (60));
if (year != (int) year)
{
#ifdef EOVERFLOW
errno = EOVERFLOW;
#else
errno = ERANGE;
#endif
ptm = NULL;
goto Exit;
}
Exit:;
return (ptm);
}/* new_gmtime_r */
static TIME_ZONE_INFO ti; /* static time zone information as returned by the system functions */
/* ------------------------------------------------------------------------- *\
read_TZ_zone_data is a helper of read_TZ for reading time zone name and
time offsets
\* ------------------------------------------------------------------------- */
static int read_TZ_zone_data (TIME_ZONE_RULE * ptr, int is_dst, char * psrc, char ** ppend)
{
int bRet = 0;
size_t size = 0;
int32_t offset = 1;
uint32_t hours = 0;
uint32_t minutes = 0;
uint32_t seconds = 0;
char * ps = psrc;
if (*ps == '<')
{
while(*ps && (*ps != '>'))
++ps;
if(*ps++ != '>')
goto Exit; /* invalid format because the required termination of the name string is missing */
}
else
{
while(*ps && (*ps != ',') && (*ps != ':') && (*ps != '-') && (*ps != '+') && ((*ps < '0') || (*ps > '9')))
++ps;
}
if(!*ps || ((ps - psrc) < 3))
goto Exit; /* time zone name too short or either time specification or rules missing */
size = ps - psrc; /* time zone name */
if((*ps != '-') && (*ps != '+') && ((*ps < '0') || (*ps > '9')))
{ /* no time specified */
offset = 0x7fffffff;
bRet = is_dst; /* in case of the summer time the specification of an offset is optional */
goto Exit;
}
if(*ps == '+')
{
offset = 1;
++ps;
}
else if(*ps == '-')
{
offset = -1;
++ps;
}
if((*ps < '0') || (*ps > '9'))
goto Exit; /* invalid format */
hours = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
hours = (hours * 10) + (*ps++ - '0');
if(hours > 24)
goto Exit; /* TZ format error :o( */
if(*ps == ':')
{ /* minutes of the offset specified */
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
minutes = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
minutes = (minutes * 10) + (*ps++ - '0');
if(minutes >= 59)
goto Exit; /* TZ format error :o( */
if(*ps == ':')
{ /* seconds of the offset specified for what ever */
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
seconds = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
seconds = (seconds * 10) + (*ps++ - '0');
if(seconds > 59)
goto Exit; /* TZ format error :o( */
}
}
offset *= hours * 3600 + minutes * 60 + seconds;
bRet = 1;
Exit:;
if(bRet)
{
*ppend = ps;
ptr->bias = offset;
if(size >= sizeof(ptr->zone_name))
size = sizeof(ptr->zone_name) -1; /* limit the zone name to the size of our buffer */
ps = ptr->zone_name;
while(size--)
*ps++ = *psrc++; /* copy zone name string */
*ps = '\0'; /* terminate zone name string */
}
return (bRet);
} /* read_TZ_zone_data */
/* ------------------------------------------------------------------------- *\
read_TZ_rules is a helper of b_read_TZ for reading the daylight saving
rules
\* ------------------------------------------------------------------------- */
static int read_TZ_rules (TIME_ZONE_RULE * ptr, char * psrc, char ** ppend)
{
int bRet = 0;
char * ps = psrc;
int32_t mode = 0;
int32_t month = 0;
int32_t mweek = 0;
int32_t wday = 0;
int32_t year_day = 0;
int32_t hour = 2; /* default is 02:00:00 */
int32_t minutes = 0;
int32_t seconds = 0;
if(*ps++ != ',')
goto Exit;
if(*ps == 'M')
{
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
month = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
month = (month * 10) + (*ps++ - '0');
if((month < 1) || (month > 12))
goto Exit; /* TZ format error :o( */
month--; /* January is 0 */
if(*ps++ != '.')
goto Exit; /* TZ format error :o( */
if ((*ps < '1') || (*ps > '5'))
goto Exit; /* TZ format error :o( */
mweek = *ps++ - '0';
if(*ps++ != '.')
goto Exit; /* TZ format error :o( */
if ((*ps < '0') || (*ps > '6'))
goto Exit; /* TZ format error :o( */
wday = *ps++ - '0';
mode = 0;
}
else if(*ps == 'J')
{
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
year_day = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
year_day = (year_day * 10) + (*ps++ - '0');
if ((*ps >= '0') && (*ps <= '9'))
year_day = (year_day * 10) + (*ps++ - '0');
if(year_day > 365) /* 364 is maximum but J365/23 is used for termination of daylight saving or a previous rule as a day that never comes */
goto Exit; /* TZ format error :o( */
mode = 1;
}
else
{
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
year_day = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
year_day = (year_day * 10) + (*ps++ - '0');
if ((*ps >= '0') && (*ps <= '9'))
year_day = (year_day * 10) + (*ps++ - '0');
if(year_day > 365)
goto Exit; /* TZ format error :o( */
mode = 2;
}
if(*ps == '/')
{ /* activation time specified */
int32_t sign = 0;
++ps;
if(*ps == '-')
{
sign = 1;
++ps;
}
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
hour = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
hour = (hour * 10) + (*ps++ - '0');
if(hour > 75)
goto Exit;
if(*ps == ':')
{ /* minutes specified */
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
minutes = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
minutes = (minutes * 10) + (*ps++ - '0');
if(minutes > 59)
goto Exit;
if(*ps == ':')
{ /* seconds specified */
++ps;
if ((*ps < '0') || (*ps > '9'))
goto Exit; /* TZ format error :o( */
seconds = *ps++ - '0';
if ((*ps >= '0') && (*ps <= '9'))
seconds = (seconds * 10) + (*ps++ - '0');
if(seconds > 59)
goto Exit;
}
}
if(sign)
{
hour *= -1;
seconds *= -1;
minutes *= -1;
}
}
ptr->mode = mode;
ptr->year_day = year_day;
ptr->month = month;
ptr->mweek = mweek;
ptr->wday = wday;
ptr->time = (hour * 3600) + (minutes * 60) + seconds;
*ppend = ps;
bRet = 1;
Exit:;
return (bRet);
} /* read_TZ_rules */
/* ------------------------------------------------------------------------- *\
read_TZ parses a Unix conform TZ evironment variable conform string for
the time zone rules and stores this rules in success case in a struct
TIME_ZONE_INFO. The function returns nonzero in success case only.
If the function fails because of an invalid string then the strage that
ptzi points to is unchanged.
\* ------------------------------------------------------------------------- */
int read_TZ (TIME_ZONE_INFO * pzi, const char * pTZ)
{
int bRet = 0;
TIME_ZONE_INFO zi;
char * ps = (char *) pTZ;
memset(&zi, 0, sizeof(zi));
if (!pzi || !ps)
goto Exit; /* internal program error :o( */
if (*ps == ':')
goto Exit; /* unknown user defined TZ format according to the Unix standard :o( */
/* Valid TZ format sample for Central European Time "CET-1CEST,M3.5.0,M10.5.0/3"
Please check the unix standard for the format description. */
if(!read_TZ_zone_data (&zi.standard, 0 /* STD time */, ps, &ps))
goto Exit; /* TZ format error :o( */
zi.type = 1; /* standard time if there is no following data */
if(read_TZ_zone_data (&zi.daylight, 1 /* STD time */, ps, &ps))
{
if(zi.daylight.bias == 0x7fffffff)
zi.daylight.bias = zi.standard.bias - 3600;
if(!read_TZ_rules (&zi.daylight, ps, &ps))
goto Exit; /* TZ format error :o( */
if(!read_TZ_rules (&zi.standard, ps, &ps))
goto Exit; /* TZ format error :o( */
zi.type = 2; /* standard time if there is no following data */
}
pzi->type = 0;
*pzi = zi;
bRet = 1;
Exit:;
return(bRet);
} /* read_TZ() */
/* ------------------------------------------------------------------------- *\
update_time_zone_info initializes or reinitializes the timezone information
that is used for new_mktime and new_localtime_r according to the current
system settings. The function is not thread safe regarding our usage of
static timezone information and requires TZ being set as specified in the
Unix standard.
\* ------------------------------------------------------------------------- */
void update_time_zone_info()
{/* Get time zone information from system */
static char last_TZ[128]="###";
char * pTZ = getenv("TZ");
struct stat st;
if(pta_lock)
pta_lock(pv_lock_context);
if(!pTZ)
{
tzset(); /* mktime should call that. */
pTZ = getenv("TZ");
}
if(pTZ)