z2loc.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <signal.h>
 
int char_time(int itime, char *ctime)
{
int hr;
  hr=itime/100;
  if(hr>=12)
  {
    hr=hr-12;
    if(hr==0) hr=12;
    sprintf(ctime,"%2dPM",hr);
  }
  else
  {
    if(hr==0) hr=12;
    sprintf(ctime,"%2dAM",hr);
  }
}
 
int z2loc(int yy,int mm,int dd,int hh)
{
FILE *pf, *popen();
char day[80];
char line1[80];
int day_num;
int daylight=-7;
int standard=-8;
 
  if(mm>=4 && mm<=10)
    return(daylight);
  if(mm>=12 || mm<=2)
    return(standard);
 
  /* get day number */
  sprintf(line1,"date +\'%w\' -d \'%02d/%02d/%04d %02d:00\'",mm,dd,yy,hh);
  pf=popen(line1,"r");
  fgets(day,sizeof(day),pf);
  pclose(pf);
  sscanf(day,"%d",&day_num);
  if(!day_num) day_num=7;;
 
  /* November, 1st Sunday*/
  if(mm==11)
  {
    if(dd>=8)
      return(standard);
    if(day_num==7)
    {
      if(hh>=10)
        return(standard);
      else
        return(daylight);
    }
    else
    {
      if(day_num-dd<=0)
        return(standard);
      else
        return(daylight);
    }
  }
 
  /* March, second Sunday */
  if(mm==3)
  {
    if(dd<=7)
      return(standard);
    if(dd >=15)
      return(daylight);
    if(day_num==7)
    {
      if(hh>=10)
        return(daylight);
      else
        return(standard);
    }
    else
    {
      if(day_num-dd>=-7)
        return(standard);
      else
        return(daylight);
    }
  }
  return(0);
}