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| Current File : //usr/local/share/namazu/pl/time.pl |
#
# -*- Perl -*-
# $Id: time.pl,v 1.5.2.4 2006/11/10 16:46:20 opengl2772 Exp $
# Copyright (C) 2004-2006 Tadamasa Teranishi
# 2004-2006 Namazu Project All rights reserved.
# This is free software with ABSOLUTELY NO WARRANTY.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either versions 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA
#
# This file must be encoded in EUC-JP encoding
#
package time;
use strict;
use Time::Local;
#
# get timezone :
# time::gettimezone() or time::timezone(-timelocal(gmtime(0)))
#
# 'JST' -> '+0900' :
# my $zone = time::timezone($zone{'JST'} * 3600);
#
# ctime -> rfc822time :
# my $time = "Sun Jan 11 16:38:39 2004";
# my $err = time::ctime_to_rfc822time(\$time);
#
# "15 Jan 2004 05:09 JST" -> "Thu, 15 Jan 2004 05:09:00 +0900" :
# my $time = "15 Jan 2004 05:09 JST";
# my $err = time::normalize_rfc822time(\$time);
#
# rfc822time -> mtime :
# my $mtime = rfc822time_to_mtime("15 Jan 2004 05:09 +0900");
#
my %zone = (
"UT" => 0, "GMT" => 0,
"EST" => -5, "EDT" => -4,
"CST" => -6, "CDT" => -5,
"MST" => -7, "MDT" => -6,
"PST" => -8, "PDT" => -7,
"JST" => +9, # illegal timezone
"A" => +1, "B" => +2, "C" => +3, "D" => +4,
"E" => +5, "F" => +6, "G" => +7, "H" => +8,
"I" => +9,
"K" => +10, "L" => +11, "M" => +12,
"N" => -1, "O" => -2, "P" => -3, "Q" => -4,
"R" => -5, "S" => -6, "T" => -7, "U" => -8,
"V" => -9, "W" => -10, "X" => -11, "Y" => -12,
"Z" => 0,
"a" => +1, "b" => +2, "c" => +3, "d" => +4,
"e" => +5, "f" => +6, "g" => +7, "h" => +8,
"i" => +9,
"k" => +10, "l" => +11, "m" => +12,
"n" => -1, "o" => -2, "p" => -3, "q" => -4,
"r" => -5, "s" => -6, "t" => -7, "u" => -8,
"v" => -9, "w" => -10, "x" => -11, "y" => -12,
"z" => 0,
);
my %wday_names = (
"Sun" => 0, "Mon" => 1, "Tue" => 2, "Wed" => 3,
"Thu" => 4, "Fri" => 5, "Sat" => 6
);
my %month_names = (
"Jan" => 0, "Feb" => 1, "Mar" => 2, "Apr" => 3,
"May" => 4, "Jun" => 5, "Jul" => 6, "Aug" => 7,
"Sep" => 8, "Oct" => 9, "Nov" => 10, "Dec" => 11
);
my $re_wday = join '|', keys %wday_names;
my $re_month = join '|', keys %month_names;
my $re_day = '(?:0?[1-9]|[12][0-9]|3[01])';
my $re_year = '(?:\d{4}|\d{2})'; # allow 2 digit fomrat
my $re_hour = '(?:[01][0-9]|2[0-3])';
my $re_min = '(?:[0-5][0-9])';
my $re_sec = '(?:[0-5][0-9])';
sub timezone ($) {
my ($time) = @_;
my $hour = int($time / 3600);
my $min = abs(int(($time - $hour * 3600) / 60));
my $timezone = sprintf("%+2.2d%2.2d", $hour, $min);
return $timezone;
}
sub gettimezone {
return timezone(timelocal(localtime(1000000)) - timelocal(gmtime(1000000)));
}
sub getwday {
my ($year, $month, $day) = @_;
if ($month == 1 or $month == 2) {
$year--;
$month += 12;
}
return ($year + int($year / 4) - int($year/100) + int($year / 400)
+ int((13 * $month + 8) / 5) + $day) % 7;
}
sub normalize_rfc822timezone ($) {
my ($timezone) = @_;
if ($timezone =~ /^(JST)$/) { # convert illegal timezone.
# "JST" -> "+0900"
return timezone($zone{"$1"} * 3600);
} elsif ($timezone eq "+0000") { # convert "+0000" -> "GMT"
return "GMT";
} elsif ($timezone =~ /^[+-]\d{2}[0-5][0-9]$/) {
# ( ("+" / "-") 4DIGIT )
return $timezone;
} elsif (exists $zone{$timezone}) {
return $timezone;
} else {
return "-0000";
}
}
sub ctime_to_rfc822time ($) {
my ($conf) = @_;
my $ctime = $$conf;
if ($ctime =~ /
^\s*
($re_wday)\s+ # a day of the week
($re_month)\s+ # name of month
($re_day)\s+ # a day of the month
($re_hour):($re_min):($re_sec)\s+ # HH:MM:SS
(\d{4})\s* # year
/x)
{
my ($week, $month, $day, $hour, $min, $sec, $year) =
($1, $2, $3, $4, $5, $6, $7);
my $timezone = gettimezone();
$$conf = sprintf("%s, %2.2d %s %d %2.2d:%2.2d:%2.2d %s\n",
$week, $day, $month, $year, $hour, $min, $sec, $timezone);
return undef;
}
return "Illegal format.";
}
sub normalize_rfc822time ($) {
my ($datetime) = @_;
if ($$datetime =~ /
^\s*
(?:($re_wday),\s+)? # (a day of the week (ignored))
($re_day)\s+ # a day of the month
($re_month)\s+ # name of month
($re_year)\s+ # year
($re_hour):($re_min)(?::($re_sec))? # HH:MM(:SS)
(?:\s+([^\s]*))?\s* # (timezone)
/x)
{
my ($mday, $month_name, $year, $hour, $min, $sec, $timezone) =
($2, $3, $4, $5, $6, $7, $8);
$timezone = gettimezone() unless($timezone);
$timezone = normalize_rfc822timezone($timezone);
return "unknown timezone." if ($timezone eq "-0000");
my $month = $month_names{$month_name};
my $wday_name =
("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat")
[getwday($year, $month + 1, $mday)];
$year += 2000 if ($year < 50);
$year += 1900 if (50 <= $year && $year <= 99);
$sec = 0 unless($sec);
$$datetime = sprintf("%s, %2.2d %s %4.4d %2.2d:%2.2d:%2.2d %s",
$wday_name, $mday, $month_name, $year,
$hour, $min, $sec, $timezone);
return undef;
}
return "Illegal format.";
}
sub rfc822time_to_mtime ($) {
my ($datetime) = @_;
my $err = time::normalize_rfc822time(\$datetime);
return -1 if ($err);
if ($datetime =~ /
^\s*
(?:($re_wday),\s+)? # (a day of the week (ignored))
($re_day)\s+ # a day of the month
($re_month)\s+ # name of month
($re_year)\s+ # year
($re_hour):($re_min)(?::($re_sec))? # HH:MM(:SS)
(?:\s+([^\s]*))?\s* # (timezone)
/x)
{
my ($mday, $month_name, $year, $hour, $min, $sec, $timezone) =
($2, $3, $4, $5, $6, $7, $8);
$timezone = time::gettimezone() unless($timezone);
$timezone = time::normalize_rfc822timezone($timezone);
return -1 if ($timezone eq "-0000");
$sec = 0 unless($sec);
my $month = $month_names{$month_name};
$year += 2000 if ($year < 50);
$year += 1900 if (50 <= $year && $year <= 99);
return -1 if ($year >= 2038);
my $mtime;
eval {
$mtime = timegm($sec, $min, $hour, $mday, $month, $year);
} || return -1;
my $offset;
if ($timezone =~ /([+-])(\d{2})([0-5][0-9])/) {
$offset = ($2 * 60 + $3) * 60;
$offset = - $offset if ($1 eq "-");
}
else {
$offset = $zone{$timezone} * 3600;
}
return $mtime - $offset;
} else {
return -1; # return with error
}
}
1;