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#include <stdlib.h> /* setenv etc. */
#include <u.h>
#define NOPLAN9DEFINES
#include <libc.h>
#include <time.h>
#define _HAVETIMEGM 1
#define _HAVETMZONE 1
#define _HAVETMTZOFF 1
#if defined(__linux__)
# undef _HAVETMZONE
# undef _HAVETMTZOFF
#elif defined(__sun__)
# undef _HAVETIMEGM
# undef _HAVETMZONE
# undef _HAVETMTZOFF
#endif
static Tm bigtm;
static void
tm2Tm(struct tm *tm, Tm *bigtm)
{
memset(bigtm, 0, sizeof *bigtm);
bigtm->sec = tm->tm_sec;
bigtm->min = tm->tm_min;
bigtm->hour = tm->tm_hour;
bigtm->mday = tm->tm_mday;
bigtm->mon = tm->tm_mon;
bigtm->year = tm->tm_year;
bigtm->wday = tm->tm_wday;
#ifdef _HAVETMZONE
strecpy(bigtm->zone, bigtm->zone+4, tm->tm_zone);
#endif
#ifdef _HAVETZOFF
bigtm->tzoff = tm->tm_gmtoff;
#endif
}
static void
Tm2tm(Tm *bigtm, struct tm *tm)
{
memset(tm, 0, sizeof *tm);
tm->tm_sec = bigtm->sec;
tm->tm_min = bigtm->min;
tm->tm_hour = bigtm->hour;
tm->tm_mday = bigtm->mday;
tm->tm_mon = bigtm->mon;
tm->tm_year = bigtm->year;
tm->tm_wday = bigtm->wday;
#ifdef _HAVETMZONE
tm->tm_zone = bigtm->zone;
#endif
#ifdef _HAVETZOFF
tm->tm_gmtoff = bigtm->tzoff;
#endif
}
Tm*
p9gmtime(long t)
{
struct tm tm;
tm = *gmtime(&t);
tm2Tm(&tm, &bigtm);
return &bigtm;
}
Tm*
p9localtime(long t)
{
struct tm tm;
tm = *localtime(&t);
tm2Tm(&tm, &bigtm);
return &bigtm;
}
#if !defined(_HAVETIMEGM)
static time_t
timegm(struct tm *tm)
{
time_t ret;
char *tz;
char *s;
tz = getenv("TZ");
putenv("TZ=");
tzset();
ret = mktime(tm);
if(tz){
s = smprint("TZ=%s", tz);
if(s)
putenv(s);
}
return ret;
}
#endif
long
p9tm2sec(Tm *bigtm)
{
struct tm tm;
Tm2tm(bigtm, &tm);
if(strcmp(bigtm->zone, "GMT") == 0 || strcmp(bigtm->zone, "UCT") == 0)
return timegm(&tm);
return mktime(&tm); /* local time zone */
}
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