mirror of
https://git.suckless.org/9base
synced 2025-09-01 04:43:47 -07:00
126 lines
1.9 KiB
C
126 lines
1.9 KiB
C
#include <u.h>
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#include <stdlib.h> /* setenv etc. */
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#define NOPLAN9DEFINES
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#include <libc.h>
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#include <time.h>
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#define _HAVETIMEGM 1
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#define _HAVETMZONE 1
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#define _HAVETMTZOFF 1
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#if defined(__linux__)
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# undef _HAVETMZONE
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# undef _HAVETMTZOFF
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#elif defined(__sun__)
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# undef _HAVETIMEGM
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# undef _HAVETMZONE
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# undef _HAVETMTZOFF
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#endif
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static Tm bigtm;
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static void
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tm2Tm(struct tm *tm, Tm *bigtm)
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{
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char *s;
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memset(bigtm, 0, sizeof *bigtm);
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bigtm->sec = tm->tm_sec;
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bigtm->min = tm->tm_min;
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bigtm->hour = tm->tm_hour;
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bigtm->mday = tm->tm_mday;
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bigtm->mon = tm->tm_mon;
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bigtm->year = tm->tm_year;
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bigtm->wday = tm->tm_wday;
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strftime(bigtm->zone, sizeof bigtm->zone, "%Z", tm);
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#ifdef _HAVETZOFF
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bigtm->tzoff = tm->tm_gmtoff;
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#endif
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if(bigtm->zone[0] == 0){
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s = getenv("TIMEZONE");
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if(s){
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strecpy(bigtm->zone, bigtm->zone+4, s);
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free(s);
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}
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}
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}
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static void
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Tm2tm(Tm *bigtm, struct tm *tm)
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{
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memset(tm, 0, sizeof *tm);
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tm->tm_sec = bigtm->sec;
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tm->tm_min = bigtm->min;
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tm->tm_hour = bigtm->hour;
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tm->tm_mday = bigtm->mday;
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tm->tm_mon = bigtm->mon;
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tm->tm_year = bigtm->year;
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tm->tm_wday = bigtm->wday;
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#ifdef _HAVETMZONE
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tm->tm_zone = bigtm->zone;
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#endif
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#ifdef _HAVETZOFF
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tm->tm_gmtoff = bigtm->tzoff;
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#endif
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}
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Tm*
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p9gmtime(long x)
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{
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time_t t;
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struct tm tm;
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t = (time_t)x;
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tm = *gmtime(&t);
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tm2Tm(&tm, &bigtm);
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return &bigtm;
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}
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Tm*
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p9localtime(long x)
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{
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time_t t;
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struct tm tm;
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t = (time_t)x;
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tm = *localtime(&t);
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tm2Tm(&tm, &bigtm);
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return &bigtm;
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}
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#if !defined(_HAVETIMEGM)
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static time_t
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timegm(struct tm *tm)
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{
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time_t ret;
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char *tz;
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char *s;
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tz = getenv("TZ");
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putenv("TZ=");
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tzset();
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ret = mktime(tm);
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if(tz){
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s = smprint("TZ=%s", tz);
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if(s)
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putenv(s);
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}
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return ret;
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}
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#endif
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long
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p9tm2sec(Tm *bigtm)
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{
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struct tm tm;
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Tm2tm(bigtm, &tm);
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if(strcmp(bigtm->zone, "GMT") == 0 || strcmp(bigtm->zone, "UCT") == 0)
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return timegm(&tm);
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return mktime(&tm); /* local time zone */
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}
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