X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/a0d0e21ea6ea90a22318550944fe6cb09ae10cda..f678642fcc8925f8f3325d3ccc96b6ce794d0a79:/lib/timelocal.pl

diff --git a/lib/timelocal.pl b/lib/timelocal.pl
index 75f1ac1..34d14a7 100644
--- a/lib/timelocal.pl
+++ b/lib/timelocal.pl
@@ -4,106 +4,21 @@
 ;#	$time = timelocal($sec,$min,$hours,$mday,$mon,$year);
 ;#	$time = timegm($sec,$min,$hours,$mday,$mon,$year);
 
-;# 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
-;# themselves are guessed by successive approximation starting at the
-;# current time, since most dates seen in practice are close to the
-;# current date.  Unlike algorithms that do a binary search (calling gmtime
-;# once for each bit of the time value, resulting in 32 calls), this algorithm
-;# calls it at most 6 times, and usually only once or twice.  If you hit
-;# the month cache, of course, it doesn't call it at all.
+;# This file has been superseded by the Time::Local library module.
+;# It is implemented as a call to that module for backwards compatibility
+;# with code written for perl4; new code should use Time::Local directly.
+;# This legacy library is deprecated and will be removed in a future
+;# release of perl.
 
-;# 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.  The timezone is determined by examining
-;# the result of localtime(0) when the package is initialized.  The daylight
-;# savings offset is currently assumed to be one hour.
+;# The current implementation shares with the original the questionable
+;# behavior of defining the timelocal() and timegm() functions in the
+;# namespace of whatever package was current when the first instance of
+;# C<require 'timelocal.pl';> was executed in a program.
 
-;# Both routines return -1 if the integer limit is hit. I.e. for dates
-;# after the 1st of January, 2038 on most machines.
+use Time::Local;
 
-CONFIG: {
-    package timelocal;
-    
-    local($[) = 0;
-    @epoch = localtime(0);
-    $tzmin = $epoch[2] * 60 + $epoch[1];	# minutes east of GMT
-    if ($tzmin > 0) {
-	$tzmin = 24 * 60 - $tzmin;		# minutes west of GMT
-	$tzmin -= 24 * 60 if $epoch[5] == 70;	# account for the date line
-    }
+*timelocal::cheat = \&Time::Local::cheat;
 
-    $SEC = 1;
-    $MIN = 60 * $SEC;
-    $HR = 60 * $MIN;
-    $DAYS = 24 * $HR;
-    $YearFix = ((gmtime(946684800))[5] == 100) ? 100 : 0;
-    1;
-}
-
-sub timegm {
-    package timelocal;
-
-    local($[) = 0;
-    $ym = pack(C2, @_[5,4]);
-    $cheat = $cheat{$ym} || &cheat;
-    return -1 if $cheat<0;
-    $cheat + $_[0] * $SEC + $_[1] * $MIN + $_[2] * $HR + ($_[3]-1) * $DAYS;
-}
-
-sub timelocal {
-    package timelocal;
-
-    local($[) = 0;
-    $time = &main'timegm + $tzmin*$MIN;
-    return -1 if $cheat<0;
-    @test = localtime($time);
-    $time -= $HR if $test[2] != $_[2];
-    $time;
-}
-
-package timelocal;
-
-sub cheat {
-    $year = $_[5];
-    $month = $_[4];
-    die "Month out of range 0..11 in timelocal.pl\n" 
-	if $month > 11 || $month < 0;
-    die "Day out of range 1..31 in timelocal.pl\n" 
-	if $_[3] > 31 || $_[3] < 1;
-    die "Hour out of range 0..23 in timelocal.pl\n"
-	if $_[2] > 23 || $_[2] < 0;
-    die "Minute out of range 0..59 in timelocal.pl\n"
-	if $_[1] > 59 || $_[1] < 0;
-    die "Second out of range 0..59 in timelocal.pl\n"
-	if $_[0] > 59 || $_[0] < 0;
-    $guess = $^T;
-    @g = gmtime($guess);
-    $year += $YearFix if $year < $epoch[5];
-    $lastguess = "";
-    while ($diff = $year - $g[5]) {
-	$guess += $diff * (363 * $DAYS);
-	@g = gmtime($guess);
-	if (($thisguess = "@g") eq $lastguess){
-	    return -1; #date beyond this machine's integer limit
-	}
-	$lastguess = $thisguess;
-    }
-    while ($diff = $month - $g[4]) {
-	$guess += $diff * (27 * $DAYS);
-	@g = gmtime($guess);
-	if (($thisguess = "@g") eq $lastguess){
-	    return -1; #date beyond this machine's integer limit
-	}
-	$lastguess = $thisguess;
-    }
-    @gfake = gmtime($guess-1); #still being sceptic
-    if ("@gfake" eq $lastguess){
-	return -1; #date beyond this machine's integer limit
-    }
-    $g[3]--;
-    $guess -= $g[0] * $SEC + $g[1] * $MIN + $g[2] * $HR + $g[3] * $DAYS;
-    $cheat{$ym} = $guess;
-}
+warn( "The 'timelocal.pl' legacy library is deprecated and will be"
+      . " removed in the next major release of perl. Please use the"
+      . " Time::Local module instead." );