113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
#define NOPLAN9DEFINES
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#include <u.h>
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#include <libc.h>
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#include <stdlib.h> /* setenv etc. */
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#include <time.h>
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static int didtz;
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static int tzdelta;
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static char tzone[4];
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static void
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dotz(void)
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{
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time_t t;
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struct tm *gtm;
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struct tm tm;
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if(didtz)
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return;
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didtz = 1;
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t = time(0);
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strftime(tzone, sizeof tzone, "%Z", localtime(&t));
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tm = *localtime(&t); /* set local time zone field */
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gtm = gmtime(&t);
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tm.tm_sec = gtm->tm_sec;
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tm.tm_min = gtm->tm_min;
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tm.tm_hour = gtm->tm_hour;
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tm.tm_mday = gtm->tm_mday;
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tm.tm_mon = gtm->tm_mon;
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tm.tm_year = gtm->tm_year;
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tm.tm_wday = gtm->tm_wday;
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tzdelta = t - mktime(&tm);
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}
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static void
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tm2Tm(struct tm *tm, Tm *bigtm, int gmt)
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{
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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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if(gmt){
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strcpy(bigtm->zone, "GMT");
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bigtm->tzoff = 0;
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}else{
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dotz();
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strcpy(bigtm->zone, tzone);
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bigtm->tzoff = tzdelta;
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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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/* initialize with current time to get local time zone! (tm_isdst) */
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time_t t;
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time(&t);
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*tm = *localtime(&t);
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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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}
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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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static Tm bigtm;
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t = (time_t)x;
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tm = *gmtime(&t);
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tm2Tm(&tm, &bigtm, 1);
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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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static Tm bigtm;
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t = (time_t)x;
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tm = *localtime(&t);
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tm2Tm(&tm, &bigtm, 0);
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return &bigtm;
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}
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long
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p9tm2sec(Tm *bigtm)
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{
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time_t t;
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struct tm tm;
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Tm2tm(bigtm, &tm);
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t = mktime(&tm);
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if(strcmp(bigtm->zone, "GMT") == 0 || strcmp(bigtm->zone, "UCT") == 0){
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dotz();
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t += tzdelta;
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}
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return t;
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}
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