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- #include <u.h>
- #include <libc.h>
- #include "zoneinfo.h"
- #define SEC2MIN 60L
- #define SEC2HOUR (60L*SEC2MIN)
- #define SEC2DAY (24L*SEC2HOUR)
- /*
- * days per month plus days/year
- */
- static int dmsize[] =
- {
- 365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
- };
- static int ldmsize[] =
- {
- 366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
- };
- /*
- * return the days/month for the given year
- */
- static int *
- yrsize(int y)
- {
- if((y%4) == 0 && ((y%100) != 0 || (y%400) == 0))
- return ldmsize;
- else
- return dmsize;
- }
- /*
- * compute seconds since Jan 1 1970 GMT
- * and convert to our timezone.
- */
- long
- tm2sec(Tm *tm)
- {
- Tinfo ti0, ti1, *ti;
- long secs;
- int i, yday, year, *d2m;
- secs = 0;
- /*
- * seconds per year
- */
- year = tm->year + 1900;
- for(i = 1970; i < year; i++){
- d2m = yrsize(i);
- secs += d2m[0] * SEC2DAY;
- }
- /*
- * if mday is set, use mon and mday to compute yday
- */
- if(tm->mday){
- yday = 0;
- d2m = yrsize(year);
- for(i=0; i<tm->mon; i++)
- yday += d2m[i+1];
- yday += tm->mday-1;
- }else{
- yday = tm->yday;
- }
- secs += yday * SEC2DAY;
- /*
- * hours, minutes, seconds
- */
- secs += tm->hour * SEC2HOUR;
- secs += tm->min * SEC2MIN;
- secs += tm->sec;
- /*
- * Assume the local time zone if zone is not GMT
- */
- if(strcmp(tm->zone, "GMT") != 0) {
- i = zonelookuptinfo(&ti0, secs);
- ti = &ti0;
- if (i != -1)
- if (ti->tzoff!=0) {
- /*
- * to what local time period `secs' belongs?
- */
- if (ti->tzoff>0) {
- /*
- * east of GMT; check previous local time transition
- */
- if (ti->t+ti->tzoff > secs)
- if (zonetinfo(&ti1, i-1)!=-1)
- ti = &ti1;
- } else
- /*
- * west of GMT; check next local time transition
- */
- if (zonetinfo(&ti1, i+1))
- if (ti1.t+ti->tzoff < secs)
- ti = &ti1;
- // fprint(2, "tt: %ld+%d %ld\n", (long)ti->t, ti->tzoff, (long)secs);
- secs -= ti->tzoff;
- }
- }
-
- if(secs < 0)
- secs = 0;
- return secs;
- }
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