perl 5.000perl-5.000

[editor's note: this commit combines approximate 4 months of furious
releases of Andy Dougherty and Larry Wall - see pod/perlhist.pod for
details.  Andy notes that;
 
Alas neither my "Irwin AccuTrack" nor my DC 600A quarter-inch cartridge 
backup tapes from that era seem to be readable anymore.  I guess 13 years 
exceeds the shelf life for that backup technology :-(.
]

1 files changed, 28 insertions, 1 deletions

diff --git a/lib/timelocal.pl b/lib/timelocal.pl
index c5d8a92920..75f1ac1851 100644
--- a/lib/timelocal.pl
+++ b/lib/timelocal.pl
@@ -21,6 +21,9 @@
 ;# the result of localtime(0) when the package is initialized.  The daylight
 ;# savings offset is currently assumed to be one hour.
 
+;# Both routines return -1 if the integer limit is hit. I.e. for dates
+;# after the 1st of January, 2038 on most machines.
+
 CONFIG: {
     package timelocal;
     
@@ -46,6 +49,7 @@ sub timegm {
     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;
 }
 
@@ -54,6 +58,7 @@ sub timelocal {
 
     local($[) = 0;
     $time = &main'timegm + $tzmin*$MIN;
+    return -1 if $cheat<0;
     @test = localtime($time);
     $time -= $HR if $test[2] != $_[2];
     $time;
@@ -64,17 +69,39 @@ package timelocal;
 sub cheat {
     $year = $_[5];
     $month = $_[4];
-    die "Month out of range 0..11 in ctime.pl\n" if $month > 11;
+    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;