mktime.c

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/****************************************************************************/
/*  mktime v2.54                                                            */
/*  Copyright (c) 1993-2004  Texas Instruments Incorporated                 */
/****************************************************************************/
#include <time.h>
#include <limits.h>

static _DATA_ACCESS const unsigned int mon_len[] =
	{31,28,31,30,31,30,31,31,30,31,30,31 };
static _DATA_ACCESS const unsigned int mon_day[] =
	{0,31,59,90,120,151,181,212,243,273,304,334};

#define JAN11900    (time_t)1                   
#define DAYS_IN_YR  (time_t)365     
#define SECS_IN_MIN (time_t)60 
#define MINS_IN_HR  (time_t)60 
#define HRS_IN_DAY  (time_t)24 
#define SECS_IN_HR  (SECS_IN_MIN * MINS_IN_HR)
#define SECS_IN_DAY (SECS_IN_HR  * HRS_IN_DAY)
#define SECS_IN_YR  (DAYS_IN_YR  * SECS_IN_DAY)

/* THE FOLLOWING MACRO DETERINES IF ADDING k TO x CAUSES OVERFLOW */

#define OVERFLOW(x,k) (((x) > 0) == ((k) > 0) &&          \
                       ((unsigned)(x)       <= INT_MAX) != \
		       ((unsigned)((x)+(k)) <= INT_MAX))

#define LEAPYEAR(y)   ( ((y + 1900) % 4 == 0) &&      \
                       (((y + 1900) % 100 != 0) || ((y + 1900) % 400 == 0)) )

_CODE_ACCESS time_t mktime(register struct tm *tptr)
{
   time_t   result;
   time_t   daycount;
   int      mdays;
   int      adjust;
    
   /*-----------------------------------------------------------------*/
   /* HANDLE SECONDS.  IF TOO MANY OR TOO FEW, MODIFY MINUTES.        */
   /*-----------------------------------------------------------------*/
   adjust = (tptr->tm_sec < 0) ? -((unsigned)(-tptr->tm_sec + 59) / 60) 
			       : (tptr->tm_sec / 60);

   if (OVERFLOW(tptr->tm_min, adjust)) return((time_t) -1);
   tptr->tm_min += adjust;
   tptr->tm_sec -= adjust * 60;

   /*-----------------------------------------------------------------*/
   /* HANDLE MINUTES.  IF TOO MANY OR TOO FEW, MODIFY HOURS           */
   /*-----------------------------------------------------------------*/
   adjust = (tptr->tm_min < 0) ? -((unsigned)(-tptr->tm_min + 59) / 60) 
			       : (tptr->tm_min / 60);

   if (OVERFLOW(tptr->tm_hour, adjust)) return((time_t) -1);
   tptr->tm_hour += adjust;
   tptr->tm_min  -= adjust * 60;

   /*-----------------------------------------------------------------*/
   /* HANDLE HOURS.    IF TOO MANY OR TOO FEW, MODIFY DAYS            */
   /*-----------------------------------------------------------------*/
   adjust = (tptr->tm_hour < 0) ? -((unsigned)(-tptr->tm_hour + 23) / 24) 
			        : (tptr->tm_hour / 24);

   if (OVERFLOW(tptr->tm_mday, adjust)) return((time_t) -1);
   tptr->tm_mday += adjust;
   tptr->tm_hour -= adjust * 24;

   for (;;)
   {
      /*-----------------------------------------------------------------*/
      /* HANDLE MONTHS.   IF TOO MANY OR TOO FEW, MODIFY YEARS           */
      /*-----------------------------------------------------------------*/
      adjust = (tptr->tm_mon < 0) ? -((unsigned)(-tptr->tm_mon + 11) / 12) 
				  : (tptr->tm_mon / 12);

      if (OVERFLOW(tptr->tm_year, adjust)) return((time_t) -1);
      tptr->tm_year += adjust;
      tptr->tm_mon  -= adjust * 12;

      /*-----------------------------------------------------------------*/
      /* HANDLE DAYS.     IF TOO MANY OR TOO FEW, MODIFY MONTHS          */
      /*-----------------------------------------------------------------*/
      if (tptr->tm_mday <= 0)
      { 
	   tptr->tm_mon--;  
           tptr->tm_mday += mon_len[tptr->tm_mon < 0 ? 11 : tptr->tm_mon] + 
		        ((tptr->tm_mon == 1) && ((tptr->tm_year % 4) == 0));
	   continue;
      }

      /*-----------------------------------------------------------------*/
      /* CALCULATE NUMBER OF DAYS IN THIS MONTH.                         */
      /*-----------------------------------------------------------------*/
      mdays = mon_len[tptr->tm_mon] + 
		( (tptr->tm_mon == 1) && LEAPYEAR(tptr->tm_year) );

      if (tptr->tm_mday > mdays) 
	{ tptr->tm_mday -= mdays; tptr->tm_mon++; }
      else break;
   }

   /*--------------------------------------------------------------------*/
   /* WE CAN NOW BE SURE THAT ALL FIELDS IN THE TIME STRUCTURE ARE RIGHT */
   /*--------------------------------------------------------------------*/
   tptr->tm_yday = mon_day[tptr->tm_mon]  + tptr->tm_mday - 1 +
                   ( (tptr->tm_mon > 1) && LEAPYEAR(tptr->tm_year) );

   daycount      = tptr->tm_year * DAYS_IN_YR  + 
	           ((tptr->tm_year - 1) / 4)   + tptr->tm_yday;

   result        = daycount      * SECS_IN_DAY + 
	           tptr->tm_hour * SECS_IN_HR  +
	           tptr->tm_min  * SECS_IN_MIN + tptr->tm_sec;

   tptr->tm_wday  = (JAN11900 + daycount) % 7;
   tptr->tm_isdst = _tz.daylight;

   return result;
}