+++ /dev/null
-#
-# various julian date calculations
-#
-# Copyright (c) - 1998 Dirk Koopman G1TLH
-#
-# $Id$
-#
-
-package julian;
-
-use FileHandle;
-use DXDebug;
-
-use strict;
-
-my @days = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
-
-# take a unix date and transform it into a julian day (ie (1998, 13) = 13th day of 1998)
-sub unixtoj
-{
- my ($pkg, $t) = @_;
- my ($day, $mon, $year) = (gmtime($t))[3..5];
- my $jday;
-
- # set the correct no of days for february
- if ($year < 100) {
- $year += ($year < 50) ? 2000 : 1900;
- }
- $days[1] = isleap($year) ? 29 : 28;
- for (my $i = 0, $jday = 0; $i < $mon; $i++) {
- $jday += $days[$i];
- }
- $jday += $day;
- return ($year, $jday);
-}
-
-# take a julian date and subtract a number of days from it, returning the julian date
-sub sub
-{
- my ($pkg, $year, $day, $amount) = @_;
- my $diny = isleap($year) ? 366 : 365;
- $day -= $amount;
- while ($day <= 0) {
- $day += $diny;
- $year -= 1;
- $diny = isleap($year) ? 366 : 365;
- }
- return ($year, $day);
-}
-
-sub add
-{
- my ($pkg, $year, $day, $amount) = @_;
- my $diny = isleap($year) ? 366 : 365;
- $day += $amount;
- while ($day > $diny) {
- $day -= $diny;
- $year += 1;
- $diny = isleap($year) ? 366 : 365;
- }
- return ($year, $day);
-}
-
-sub cmp
-{
- my ($pkg, $y1, $d1, $y2, $d2) = @_;
- return $d1 - $d2 if ($y1 == $y2);
- return $y1 - $y2;
-}
-
-# is it a leap year?
-sub isleap
-{
- my $year = shift;
- return ($year % 4 == 0 && ($year % 100 != 0 || $year % 400 == 0)) ? 1 : 0;
-}
-
-# open a data file with prefix $fn/$year/$day.dat and return an object to it
-sub open
-{
- my ($name, $pkg, $fn, $year, $day, $mode) = @_;
-
- # if we are writing, check that the directory exists
- if (defined $mode) {
- my $dir = "$fn/$year";
- mkdir($dir, 0777) if ! -e $dir;
- }
- my $self = {};
- $self->{fn} = sprintf "$fn/$year/%03d.dat", $day;
- $mode = 'r' if !$mode;
- my $fh = new FileHandle $self->{fn}, $mode;
- return undef if !$fh;
- $fh->autoflush(1) if $mode ne 'r'; # make it autoflushing if writable
- $self->{fh} = $fh;
- $self->{year} = $year;
- $self->{day} = $day;
- dbg("julian", "opening $self->{fn}\n");
-
- return bless $self, $pkg;
-}
-
-# close the data file
-sub close
-{
- my $self = shift;
- undef $self->{fh}; # close the filehandle
- delete $self->{fh};
-}
-
-sub DESTROY # catch undefs and do what is required further do the tree
-{
- my $self = shift;
- dbg("julian", "closing $self->{fn}\n");
- undef $self->{fh} if defined $self->{fh};
-}
-
-1;