rainlance/amiga-tz
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Kwaj work

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SCCS-file: zdump.c
SCCS-SID: 7.4
This commit is contained in:
Arthur David Olson
1993-08-28 12:13:24 -04:00
committed by Paul Eggert
parent 362012ba6e
commit 7e261b8887
1 changed files with 36 additions and 7 deletions
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43
zdump.c
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@ -39,8 +39,12 @@ static char elsieid[] = "%W%";
#define SECSPERMIN 60
#endif /* !defined SECSPERMIN */
#ifndef MINSPERHOUR
#define MINSPERHOUR 60
#endif /* !defined MINSPERHOUR */
#ifndef SECSPERHOUR
#define SECSPERHOUR 3600
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#endif /* !defined SECSPERHOUR */
#ifndef HOURSPERDAY
@ -51,6 +55,10 @@ static char elsieid[] = "%W%";
#define EPOCH_YEAR 1970
#endif /* !defined EPOCH_YEAR */
#ifndef TM_YEAR_BASE
#define TM_YEAR_BASE 1900
#endif /* !defined TM_YEAR_BASE */
#ifndef DAYSPERNYEAR
#define DAYSPERNYEAR 365
#endif /* !defined DAYSPERNYEAR */
@ -71,6 +79,7 @@ extern void perror();
static char * abbr();
static long delta();
static void hunt();
static int leapyearsbeforeyear();
static int longest;
static char * progname;
static void show();
@ -225,6 +234,18 @@ time_t hit;
show(name, hit, TRUE);
}
/*
** How many putative leap days before the start of year y?
*/
static int
leapyearsbeforeyear(y)
int y;
{
return (y - 1) / 4 - (y - 1) / 100 + (y - 1) / 400;
}
static long
delta(newp, oldp)
struct tm * newp;
@ -232,12 +253,20 @@ struct tm * oldp;
{
long result;
result = newp->tm_hour - oldp->tm_hour;
if (result < 0)
result += HOURSPERDAY;
result *= SECSPERHOUR;
result += (newp->tm_min - oldp->tm_min) * SECSPERMIN;
return result + newp->tm_sec - oldp->tm_sec;
result = newp->tm_year - oldp->tm_year;
if (result != 0) {
result *= DAYSPERNYEAR;
result += leapyearsbeforeyear(newp->tm_year + TM_YEAR_BASE) -
leapyearsbeforeyear(oldp->tm_year + TM_YEAR_BASE);
}
result += newp->tm_yday - oldp->tm_yday;
result *= HOURSPERDAY;
result += newp->tm_hour - oldp->tm_hour;
result *= MINSPERHOUR;
result += newp->tm_min - oldp->tm_min;
result *= SECSPERMIN;
result += newp->tm_sec - oldp->tm_sec;
return result;
}
static void