/* ECP: FILEname=fig9_9.c */
/* 1*/   /*Fill In The tm_yday Field, As In mktime */

/* 2*/   int
/* 3*/   MkYear( struct tm *TmStruct )
/* 4*/   {
/* 5*/       static const int MonthDays[ ] =
/* 6*/           { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
/* 7*/       static const int LeapMonthDays[ ] =
/* 8*/           { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
/* 9*/       const int *MyMonthDays;
/*10*/       int i;

/*11*/       if( TmStruct != NULL )
/*12*/       {
/*13*/                 int Days  = ( *TmStruct ).tm_mday;
/*14*/           const int Month = ( *TmStruct ).tm_mon;
/*15*/           const int Year  = ( *TmStruct ).tm_year + 1900;

/*16*/           MyMonthDays = IsLeap( Year ) ? LeapMonthDays : MonthDays;
/*17*/           if( Month < 0 || Month > 11 || Days < 0 ||
/*18*/                       Days > MyMonthDays[ Month ] )
/*19*/               return -1; 

/*20*/           for( i = 0; i < Month; i++ )
/*21*/               Days += MyMonthDays[ i ];

/*22*/           ( *TmStruct ).tm_yday = Days;
/*23*/           return 0;
/*24*/       }
/*25*/       return -1;
/*26*/   }