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Diffstat (limited to 'Master/tlpkg/tlperl/lib/Time/Local.pm')
-rw-r--r-- | Master/tlpkg/tlperl/lib/Time/Local.pm | 366 |
1 files changed, 0 insertions, 366 deletions
diff --git a/Master/tlpkg/tlperl/lib/Time/Local.pm b/Master/tlpkg/tlperl/lib/Time/Local.pm deleted file mode 100644 index 912f17d0310..00000000000 --- a/Master/tlpkg/tlperl/lib/Time/Local.pm +++ /dev/null @@ -1,366 +0,0 @@ -package Time::Local; - -require Exporter; -use Carp; -use Config; -use strict; -use integer; - -use vars qw( $VERSION @ISA @EXPORT @EXPORT_OK ); -$VERSION = '1.11'; -$VERSION = eval $VERSION; -@ISA = qw( Exporter ); -@EXPORT = qw( timegm timelocal ); -@EXPORT_OK = qw( timegm_nocheck timelocal_nocheck ); - -my @MonthDays = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); - -# Determine breakpoint for rolling century -my $ThisYear = (localtime())[5]; -my $Breakpoint = ($ThisYear + 50) % 100; -my $NextCentury = $ThisYear - $ThisYear % 100; - $NextCentury += 100 if $Breakpoint < 50; -my $Century = $NextCentury - 100; -my $SecOff = 0; - -my (%Options, %Cheat, %Min, %Max); -my ($MinInt, $MaxInt); - -if ($^O eq 'MacOS') { - # time_t is unsigned... - $MaxInt = (1 << (8 * $Config{intsize})) - 1; - $MinInt = 0; -} else { - $MaxInt = ((1 << (8 * $Config{intsize} - 2))-1)*2 + 1; - $MinInt = -$MaxInt - 1; - - # On Win32 (and others?) time_t appears to be signed, but negative - # epochs still don't work. - XXX - this is experimental - $MinInt = 0 - unless defined ((localtime(-1))[0]); -} - -$Max{Day} = ($MaxInt >> 1) / 43200; -$Min{Day} = $MinInt ? -($Max{Day} + 1) : 0; - -$Max{Sec} = $MaxInt - 86400 * $Max{Day}; -$Min{Sec} = $MinInt - 86400 * $Min{Day}; - -# Determine the EPOC day for this machine -my $Epoc = 0; -if ($^O eq 'vos') { -# work around posix-977 -- VOS doesn't handle dates in -# the range 1970-1980. - $Epoc = _daygm((0, 0, 0, 1, 0, 70, 4, 0)); -} -elsif ($^O eq 'MacOS') { - no integer; - - # MacOS time() is seconds since 1 Jan 1904, localtime - # so we need to calculate an offset to apply later - $Epoc = 693901; - $SecOff = timelocal(localtime(0)) - timelocal(gmtime(0)); - $Epoc += _daygm(gmtime(0)); -} -else { - $Epoc = _daygm(gmtime(0)); -} - -%Cheat=(); # clear the cache as epoc has changed - -sub _daygm { - $_[3] + ($Cheat{pack("ss",@_[4,5])} ||= do { - my $month = ($_[4] + 10) % 12; - my $year = $_[5] + 1900 - $month/10; - 365*$year + $year/4 - $year/100 + $year/400 + ($month*306 + 5)/10 - $Epoc - }); -} - - -sub _timegm { - my $sec = $SecOff + $_[0] + 60 * $_[1] + 3600 * $_[2]; - - no integer; - - $sec + 86400 * &_daygm; -} - - -sub _zoneadjust { - my ($day, $sec, $time) = @_; - - $sec = $sec + _timegm(localtime($time)) - $time; - if ($sec >= 86400) { $day++; $sec -= 86400; } - if ($sec < 0) { $day--; $sec += 86400; } - - ($day, $sec); -} - - -sub timegm { - my ($sec,$min,$hour,$mday,$month,$year) = @_; - - if ($year >= 1000) { - $year -= 1900; - } - elsif ($year < 100 and $year >= 0) { - $year += ($year > $Breakpoint) ? $Century : $NextCentury; - } - - unless ($Options{no_range_check}) { - if (abs($year) >= 0x7fff) { - $year += 1900; - croak "Cannot handle date ($sec, $min, $hour, $mday, $month, *$year*)"; - } - - croak "Month '$month' out of range 0..11" if $month > 11 or $month < 0; - - my $md = $MonthDays[$month]; -# ++$md if $month == 1 and $year % 4 == 0 and -# ($year % 100 != 0 or ($year + 1900) % 400 == 0); - ++$md unless $month != 1 or $year % 4 or !($year % 400); - - croak "Day '$mday' out of range 1..$md" if $mday > $md or $mday < 1; - croak "Hour '$hour' out of range 0..23" if $hour > 23 or $hour < 0; - croak "Minute '$min' out of range 0..59" if $min > 59 or $min < 0; - croak "Second '$sec' out of range 0..59" if $sec > 59 or $sec < 0; - } - - my $days = _daygm(undef, undef, undef, $mday, $month, $year); - my $xsec = $sec + $SecOff + 60*$min + 3600*$hour; - - unless ($Options{no_range_check} - or ($days > $Min{Day} or $days == $Min{Day} and $xsec >= $Min{Sec}) - and ($days < $Max{Day} or $days == $Max{Day} and $xsec <= $Max{Sec})) - { - warn "Day too small - $days > $Min{Day}\n" if $days < $Min{Day}; - warn "Day too big - $days > $Max{Day}\n" if $days > $Max{Day}; - warn "Sec too small - $days < $Min{Sec}\n" if $days < $Min{Sec}; - warn "Sec too big - $days > $Max{Sec}\n" if $days > $Max{Sec}; - $year += 1900; - croak "Cannot handle date ($sec, $min, $hour, $mday, $month, $year)"; - } - - no integer; - - $xsec + 86400 * $days; -} - - -sub timegm_nocheck { - local $Options{no_range_check} = 1; - &timegm; -} - - -sub timelocal { - # Adjust Max/Min allowed times to fit local time zone and call timegm - local ($Max{Day}, $Max{Sec}) = _zoneadjust($Max{Day}, $Max{Sec}, $MaxInt); - local ($Min{Day}, $Min{Sec}) = _zoneadjust($Min{Day}, $Min{Sec}, $MinInt); - my $ref_t = &timegm; - - # Calculate first guess with a one-day delta to avoid localtime overflow - my $delta = ($_[5] < 100)? 86400 : -86400; - my $loc_t = _timegm(localtime( $ref_t + $delta )) - $delta; - - # Is there a timezone offset from GMT or are we done - my $zone_off = $ref_t - $loc_t - or return $loc_t; - - # This hack is needed to always pick the first matching time - # during a DST change when time would otherwise be ambiguous - $zone_off -= 3600 if ($delta > 0 && $ref_t >= 3600); - - # Adjust for timezone - $loc_t = $ref_t + $zone_off; - - # Are we close to a DST change or are we done - my $dst_off = $ref_t - _timegm(localtime($loc_t)) - or return $loc_t; - - # Adjust for DST change - $loc_t += $dst_off; - - return $loc_t if $dst_off >= 0; - - # for a negative offset from GMT, and if the original date - # was a non-extent gap in a forward DST jump, we should - # now have the wrong answer - undo the DST adjust; - - my ($s,$m,$h) = localtime($loc_t); - $loc_t -= $dst_off if $s != $_[0] || $m != $_[1] || $h != $_[2]; - - $loc_t; -} - - -sub timelocal_nocheck { - local $Options{no_range_check} = 1; - &timelocal; -} - -1; - -__END__ - -=head1 NAME - -Time::Local - efficiently compute time from local and GMT time - -=head1 SYNOPSIS - - $time = timelocal($sec,$min,$hour,$mday,$mon,$year); - $time = timegm($sec,$min,$hour,$mday,$mon,$year); - -=head1 DESCRIPTION - -These routines are the inverse of built-in perl functions localtime() -and gmtime(). They accept a date as a six-element array, and return -the corresponding time(2) value in seconds since the system epoch -(Midnight, January 1, 1970 GMT on Unix, for example). This value can -be positive or negative, though POSIX only requires support for -positive values, so dates before the system's epoch may not work on -all operating systems. - -It is worth drawing particular attention to the expected ranges for -the values provided. The value for the day of the month is the actual day -(ie 1..31), while the month is the number of months since January (0..11). -This is consistent with the values returned from localtime() and gmtime(). - -The timelocal() and timegm() functions perform range checking on the -input $sec, $min, $hour, $mday, and $mon values by default. If you'd -rather they didn't, you can explicitly import the timelocal_nocheck() -and timegm_nocheck() functions. - - use Time::Local 'timelocal_nocheck'; - - { - # The 365th day of 1999 - print scalar localtime timelocal_nocheck 0,0,0,365,0,99; - - # The twenty thousandth day since 1970 - print scalar localtime timelocal_nocheck 0,0,0,20000,0,70; - - # And even the 10,000,000th second since 1999! - print scalar localtime timelocal_nocheck 10000000,0,0,1,0,99; - } - -Your mileage may vary when trying these with minutes and hours, -and it doesn't work at all for months. - -Strictly speaking, the year should also be specified in a form consistent -with localtime(), i.e. the offset from 1900. -In order to make the interpretation of the year easier for humans, -however, who are more accustomed to seeing years as two-digit or four-digit -values, the following conventions are followed: - -=over 4 - -=item * - -Years greater than 999 are interpreted as being the actual year, -rather than the offset from 1900. Thus, 1964 would indicate the year -Martin Luther King won the Nobel prize, not the year 3864. - -=item * - -Years in the range 100..999 are interpreted as offset from 1900, -so that 112 indicates 2012. This rule also applies to years less than zero -(but see note below regarding date range). - -=item * - -Years in the range 0..99 are interpreted as shorthand for years in the -rolling "current century," defined as 50 years on either side of the current -year. Thus, today, in 1999, 0 would refer to 2000, and 45 to 2045, -but 55 would refer to 1955. Twenty years from now, 55 would instead refer -to 2055. This is messy, but matches the way people currently think about -two digit dates. Whenever possible, use an absolute four digit year instead. - -=back - -The scheme above allows interpretation of a wide range of dates, particularly -if 4-digit years are used. - -Please note, however, that the range of dates that can be actually be handled -depends on the size of an integer (time_t) on a given platform. -Currently, this is 32 bits for most systems, yielding an approximate range -from Dec 1901 to Jan 2038. - -Both timelocal() and timegm() croak if given dates outside the supported -range. - -=head2 Ambiguous Local Times (DST) - -Because of DST changes, there are many time zones where the same local -time occurs for two different GMT times on the same day. For example, -in the "Europe/Paris" time zone, the local time of 2001-10-28 02:30:00 -can represent either 2001-10-28 00:30:00 GMT, B<or> 2001-10-28 -01:30:00 GMT. - -When given an ambiguous local time, the timelocal() function should -always return the epoch for the I<earlier> of the two possible GMT -times. - -=head2 Non-Existent Local Times (DST) - -When a DST change causes a locale clock to skip one hour forward, -there will be an hour's worth of local times that don't exist. Again, -for the "Europe/Paris" time zone, the local clock jumped from -2001-03-25 01:59:59 to 2001-03-25 03:00:00. - -If the timelocal() function is given a non-existent local time, it -will simply return an epoch value for the time one hour later. - -=head2 Negative Epoch Values - -Negative epoch (time_t) values are not officially supported by the -POSIX standards, so this module's tests do not test them. On some -systems, they are known not to work. These include MacOS (pre-OSX) -and Win32. - -On systems which do support negative epoch values, this module should -be able to cope with dates before the start of the epoch, down the -minimum value of time_t for the system. - -=head1 IMPLEMENTATION - -These routines are quite efficient and yet are always guaranteed to agree -with localtime() and gmtime(). We manage this by caching the start times -of any months we've seen before. If we know the start time of the month, -we can always calculate any time within the month. The start times -are calculated using a mathematical formula. Unlike other algorithms -that do multiple calls to gmtime(). - -timelocal() is implemented using the same cache. We just assume that we're -translating a GMT time, and then fudge it when we're done for the timezone -and daylight savings arguments. Note that the timezone is evaluated for -each date because countries occasionally change their official timezones. -Assuming that localtime() corrects for these changes, this routine will -also be correct. - -=head1 BUGS - -The whole scheme for interpreting two-digit years can be considered a bug. - -=head1 SUPPORT - -Support for this module is provided via the datetime@perl.org -email list. See http://lists.perl.org/ for more details. - -Please submit bugs using the RT system at rt.cpan.org, or as a last -resort, to the datetime@perl.org list. - -=head1 AUTHOR - -This module is based on a Perl 4 library, timelocal.pl, that was -included with Perl 4.036, and was most likely written by Tom -Christiansen. - -The current version was written by Graham Barr. - -It is now being maintained separately from the Perl core by Dave -Rolsky, <autarch@urth.org>. - -=cut - |