koerberm@nixsin.UUCP (Mathias Koerber) (09/08/89)
Subject: HELP ! Why doesn't it run on my machine ?
Newsgroups: nix.general,comp.unix.wizards
Keywords: Dateconversion
I recently posted a request for date conversion routine, and one answer I got
was from Paul Regent (paulr@sequent), who sent me his routine. It loked good
to me, so i tried it. But, I didn't run. So i checked it out and sent it back
to Paul with a lot of output and debug-information. He answered, that on his
machine it runs, and sent me some of his runs. I still can't figure out, what
is different on our machines. I include the code here, so maybe someone can
point out the mistake to me.
BTW: Paul has some BSD system, while I have tried it out on two systems.
One is a Nixdorf Targon/31 M30 running SysV (TOS 3.2.50);
The other is a Targon/35 running SysV AND UCB:
TOS32DN nixsin TOS 3.2-06 0511m TARGON/35
ANSWERS: PLEASE USE THE ADDRESSES IN MY SIGNATURE, AS MY MAILER INCLUDES SOME
INFORMATION WHICH IS NOT KNOWN TO THE OUTSIDE WORLD.
Thx,
Mathias
And here the code:
---- cut here ----
#define Seconds_per_minute 60
#define Seconds_per_hour 60*Seconds_per_minute
#define Seconds_per_day 24*Seconds_per_hour
#define Seconds_per_month 30*Seconds_per_day
#define Seconds_per_year 365*Seconds_per_day
#include <sys/types.h>
#include <sys/time.h>
time_t
tm_to_time_t(t)
struct tm t;
{
time_t high_guess = 0,low_guess = 0,middle;
struct tm *temp;
int score_high,score_low,nyears,low = 0,high = 0;
static int fudges[12] = { 0*Seconds_per_day, /* Jan. */
1*Seconds_per_day, /* Feb. */
-1*Seconds_per_day, /* Mar. */
0*Seconds_per_day, /* Apr. */
0*Seconds_per_day, /* May */
1*Seconds_per_day, /* Jun. */
1*Seconds_per_day, /* Jul. */
2*Seconds_per_day, /* Aug. */
3*Seconds_per_day, /* Sep. */
3*Seconds_per_day, /* Oct. */
4*Seconds_per_day, /* Nov. */
4*Seconds_per_day /* Dec. */ };
nyears = t.tm_year - 70;
low_guess = Seconds_per_year*nyears +
(double) ((nyears-1)*Seconds_per_day) * 0.24 + /* add in leap days... */
Seconds_per_month*t.tm_mon +
fudges[t.tm_mon] + /* Add in approximate days for 'non-30' day months. */
Seconds_per_day*(t.tm_mday - 1) + Seconds_per_hour*t.tm_hour + Seconds_per_minute*t.tm_min + t.tm_sec;
high_guess = low_guess + 2*Seconds_per_day;
while (abs((high_guess - low_guess)) > 1) {
middle = (high_guess + low_guess) / 2;
temp = localtime(&middle);
score_high = ((temp->tm_year > t.tm_year) << 5) + ((temp->tm_mon > t.tm_mon) << 4) + ((temp->tm_mday > t.tm_mday) << 3) +
((temp->tm_hour > t.tm_hour) << 2) + ((temp->tm_min > t.tm_min) << 1) + (temp->tm_sec > t.tm_sec);
score_low = ((temp->tm_year < t.tm_year) << 5) + ((temp->tm_mon < t.tm_mon) << 4) + ((temp->tm_mday < t.tm_mday) << 3) +
((temp->tm_hour < t.tm_hour) << 2) + ((temp->tm_min < t.tm_min) << 1) + (temp->tm_sec < t.tm_sec);
if (score_high > score_low)
high_guess = middle,high++;
else
low_guess = middle,low++;
}
return middle;
}
main(argc,argv)
int argc;
char *argv[];
{
struct tm z;
time_t t;
z.tm_hour = atoi(argv[1]);
z.tm_min = atoi(argv[2]);
z.tm_sec = atoi(argv[3]);
z.tm_mday = atoi(argv[4]);
z.tm_mon = atoi(argv[5]);
z.tm_year = atoi(argv[6]);
t = tm_to_time_t(z);
printf("%d is the time representation for: %s",t,ctime(&t));
}
---- cut here ----
And here some results (from my side):
---- cut here ----
time2 0 0 0 1 0 70
-20734 is the time representation for: Thu Jan 1 02:14:26 1970
# Here the hours are somewhat wrong
time2 0 0 0 8 8 89
621187200 is the time representation for: Fri Sep 8 00:00:00 1989
# OK !
time2 0 0 0 2 2 71
36720001 is the time representation for: Tue Mar 2 08:00:01 1971
# again, WRONG !
time2 0 0 0 6 2 93
731347201 is the time representation for: Sat Mar 6 00:00:01 1993
# OK !
time2 0 0 0 9 9 99
939403008 is the time representation for: Sat Oct 9 01:16:48 1999
# WRONG !!
time2 0 0 0 1 0 87
536443776 is the time representation for: Thu Jan 1 04:09:36 1987
# WRONG
--
-Mathias Koerber |Tel: +65 / 7473828 ext 322 |Fax: +65 / 7474331
-Nixdorf Computer Singapore|EUnet: koerber.sin@nixpbe |nerv: koerber.sin
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