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#!/usr/bin/perl -w
use strict;
use vars qw($Is_W32 $Is_OS2 $Is_Cygwin $Is_NetWare $Needs_Write);
use Config; # Remember, this is running using an existing perl
# Common functions needed by the regen scripts
$Is_W32 = $^O eq 'MSWin32';
$Is_OS2 = $^O eq 'os2';
$Is_Cygwin = $^O eq 'cygwin';
$Is_NetWare = $Config{osname} eq 'NetWare';
if ($Is_NetWare) {
$Is_W32 = 0;
}
$Needs_Write = $Is_OS2 || $Is_W32 || $Is_Cygwin || $Is_NetWare;
eval "use Digest::MD5 'md5'; 1;"
or warn "Digest::MD5 unavailable, doing unconditional regen\n";
sub cksum {
my $pl = shift;
my ($buf, $cksum);
local *FH;
if (open(FH, $pl)) {
local $/;
$buf = <FH>;
$cksum = defined &md5 ? md5($buf) : 0;
close FH;
} else {
warn "$0: $pl: $!\n";
}
return $cksum;
}
sub safer_unlink {
my @names = @_;
my $cnt = 0;
my $name;
foreach $name (@names) {
next unless -e $name;
chmod 0777, $name if $Needs_Write;
( CORE::unlink($name) and ++$cnt
or warn "Couldn't unlink $name: $!\n" );
}
return $cnt;
}
sub safer_rename_silent {
my ($from, $to) = @_;
# Some dosish systems can't rename over an existing file:
safer_unlink $to;
chmod 0600, $from if $Needs_Write;
rename $from, $to;
}
sub safer_rename_always {
my ($from, $to) = @_;
safer_rename_silent($from, $to) or die "renaming $from to $to: $!";
}
sub safer_rename {
my ($from, $to) = @_;
my $fc = cksum($from);
my $tc = cksum($to);
if ($fc and $fc eq $tc) {
warn "no changes between '$from' & '$to'\n";
safer_unlink($from);
return;
}
warn "changed '$from' to '$to'\n";
safer_rename_silent($from, $to) or die "renaming $from to $to: $!";
}
1;
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