perl 5.002_01: lib/ExtUtils/MM_Unix.pm

[p5sagit/p5-mst-13.2.git] / lib / timelocal.pl

diff --git a/lib/timelocal.pl b/lib/timelocal.pl
index 5be3840..75f1ac1 100644 (file)
--- 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;
     
@@ -36,6 +39,8 @@ CONFIG: {
     $MIN = 60 * $SEC;
     $HR = 60 * $MIN;
     $DAYS = 24 * $HR;
+    $YearFix = ((gmtime(946684800))[5] == 100) ? 100 : 0;
+    1;
 }
 
 sub timegm {
@@ -44,6 +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;
 }
 
@@ -52,6 +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;
@@ -62,16 +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;