211c5a57c2
git-svn-id: https://unbound.nlnetlabs.nl/svn/trunk@1117 be551aaa-1e26-0410-a405-d3ace91eadb9
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
|
|
* Taken from FreeBSD src / lib / libc / stdtime / localtime.c 1.43 revision.
|
|
* localtime.c 7.78.
|
|
* tzfile.h 1.8
|
|
* adapted to be replacement gmtime_r.
|
|
*/
|
|
#include "config.h"
|
|
|
|
#ifdef HAVE_TIME_H
|
|
#include <time.h>
|
|
#endif
|
|
|
|
#define MONSPERYEAR 12
|
|
#define DAYSPERNYEAR 365
|
|
#define DAYSPERLYEAR 366
|
|
#define SECSPERMIN 60
|
|
#define SECSPERHOUR (60*60)
|
|
#define SECSPERDAY (24*60*60)
|
|
#define DAYSPERWEEK 7
|
|
#define TM_SUNDAY 0
|
|
#define TM_MONDAY 1
|
|
#define TM_TUESDAY 2
|
|
#define TM_WEDNESDAY 3
|
|
#define TM_THURSDAY 4
|
|
#define TM_FRIDAY 5
|
|
#define TM_SATURDAY 6
|
|
|
|
#define TM_YEAR_BASE 1900
|
|
|
|
#define EPOCH_YEAR 1970
|
|
#define EPOCH_WDAY TM_THURSDAY
|
|
|
|
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 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
|
|
};
|
|
|
|
static void
|
|
timesub(timep, offset, tmp)
|
|
const time_t * const timep;
|
|
const long offset;
|
|
struct tm * const tmp;
|
|
{
|
|
long days;
|
|
long rem;
|
|
long y;
|
|
int yleap;
|
|
const int * ip;
|
|
|
|
days = *timep / SECSPERDAY;
|
|
rem = *timep % SECSPERDAY;
|
|
rem += (offset);
|
|
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);
|
|
/*
|
|
** A positive leap second requires a special
|
|
** representation. This uses "... ??:59:60" et seq.
|
|
*/
|
|
tmp->tm_sec = (int) (rem % SECSPERMIN) ;
|
|
tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK);
|
|
if (tmp->tm_wday < 0)
|
|
tmp->tm_wday += DAYSPERWEEK;
|
|
y = EPOCH_YEAR;
|
|
#define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400)
|
|
while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) {
|
|
long newy;
|
|
|
|
newy = y + days / DAYSPERNYEAR;
|
|
if (days < 0)
|
|
--newy;
|
|
days -= (newy - y) * DAYSPERNYEAR +
|
|
LEAPS_THRU_END_OF(newy - 1) -
|
|
LEAPS_THRU_END_OF(y - 1);
|
|
y = newy;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Re-entrant version of gmtime.
|
|
*/
|
|
struct tm * gmtime_r(const time_t* timep, struct tm *tm)
|
|
{
|
|
timesub(timep, 0L, tm);
|
|
return tm;
|
|
}
|