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tmxmake.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * Time_t conversion support
 */

#include <tmx.h>

#include "FEATURE/tmlib"

/*
 * return Tm_t for t
 * time zone and leap seconds accounted for in return value
 */

Tm_t*
tmxmake(Time_t t)
{
      register struct tm*     tp;
      register Tm_leap_t*     lp;
      Time_t                  x;
      time_t                  now;
      int               leapsec;
      int               y;
      uint32_t          n;
      int32_t                 o;
#if TMX_FLOAT
      Time_t                  z;
      uint32_t          i;
#endif
      Tm_t              tm;

      static Tm_t       ts;

      tmset(tm_info.zone);
      leapsec = 0;
      if ((tm_info.flags & (TM_ADJUST|TM_LEAP)) == (TM_ADJUST|TM_LEAP) && (n = tmxsec(t)))
      {
            for (lp = &tm_data.leap[0]; n < lp->time; lp++);
            if (lp->total)
            {
                  if (n == lp->time && (leapsec = (lp->total - (lp+1)->total)) < 0)
                        leapsec = 0;
                  t = tmxsns(n - lp->total, tmxnsec(t));
            }
      }
      x = tmxsec(t);
      if (tm_info.flags & TM_UTC)
      {
            tm.tm_zone = &tm_data.zone[2];
            o = 0;
      }
      else
      {
            tm.tm_zone = tm_info.zone;
            o = 60 * tm.tm_zone->west;
            if (x > o)
            {
                  x -= o;
                  o = 0;
            }
      }
#if TMX_FLOAT
      i = x / (24 * 60 * 60);
      z = i;
      n = x - z * (24 * 60 * 60);
      tm.tm_sec = n % 60 + leapsec;
      n /= 60;
      tm.tm_min = n % 60;
      n /= 60;
      tm.tm_hour = n % 24;
#define x   i
#else
      tm.tm_sec = x % 60 + leapsec;
      x /= 60;
      tm.tm_min = x % 60;
      x /= 60;
      tm.tm_hour = x % 24;
      x /= 24;
#endif
      tm.tm_wday = (x + 4) % 7;
      tm.tm_year = (400 * (x + 25202)) / 146097 + 1;
      n = tm.tm_year - 1;
      x -= n * 365 + n / 4 - n / 100 + (n + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4;
      tm.tm_mon = 0;
      tm.tm_mday = x + 1;
      tmfix(&tm);
      n += 1900;
      tm.tm_isdst = 0;
      if (tm.tm_zone->daylight)
      {
            if ((y = tmequiv(&tm) - 1900) == tm.tm_year)
                  now = tmxsec(t);
            else
            {
                  Tm_t  te;

                  te = tm;
                  te.tm_year = y;
                  now = tmxsec(tmxtime(&te, tm.tm_zone->west));
            }
            if ((tp = tmlocaltime(&now)) && ((tm.tm_isdst = tp->tm_isdst) || o))
            {
                  tm.tm_min -= o / 60 + (tm.tm_isdst ? tm.tm_zone->dst : 0);
                  tmfix(&tm);
            }
      }
      tm.tm_nsec = tmxnsec(t);
      ts = tm;
      return &ts;
}

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