Category : Files from Magazines
Archive   : CUJ9301.ZIP
Filename : 1101117B

 
Output of file : 1101117B contained in archive : CUJ9301.ZIP
/* date_int.c: Compute duration between two dates */

#include "date.h"

#define isleap(y) \
((y)%4 == 0 && (y)%100 != 0 || (y)%400 == 0)

static int Dtab [2][13] =
{
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};

Date *date_interval(const Date *d1, const Date *d2)
{
static Date result;
int months, days, years, prev_month;

/* Compute the interval - assume d1 precedes d2 */
years = d2->year - d1->year;
months = d2->month - d1->month;
days = d2->day - d1->day;

/* Do obvious corrections (days before months!)
*
* This is a loop in case the previous month is
* February, and days < -28.
*/
prev_month = d2->month - 1;
while (days < 0)
{
/* Borrow from the previous month */
if (prev_month == 0)
prev_month = 12;
--months;
days += Dtab[isleap(d2->year)][prev_month--];
}

if (months < 0)
{
/* Borrow from the previous year */
--years;
months += 12;
}

/* Prepare output */
result.month = months;
result.day = days;
result.year = years;
return &result;
}


  3 Responses to “Category : Files from Magazines
Archive   : CUJ9301.ZIP
Filename : 1101117B

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

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