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#!/usr/bin/perl -w
use strict;
use vars qw($Needs_Write $Verbose @Changed);
use File::Compare;
use Symbol;
# Common functions needed by the regen scripts
$Needs_Write = $^O eq 'cygwin' || $^O eq 'os2' || $^O eq 'MSWin32';
$Verbose = 0;
@ARGV = grep { not($_ eq '-q' and $Verbose = -1) }
grep { not($_ eq '-v' and $Verbose = 1) } @ARGV;
END {
print STDOUT "Changed: @Changed\n" if @Changed;
}
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, $to;
}
sub rename_if_different {
my ($from, $to) = @_;
if (compare($from, $to) == 0) {
warn "no changes between '$from' & '$to'\n" if $Verbose > 0;
safer_unlink($from);
return;
}
warn "changed '$from' to '$to'\n" if $Verbose > 0;
push @Changed, $to unless $Verbose < 0;
safer_rename_silent($from, $to) or die "renaming $from to $to: $!";
}
# Saf*er*, but not totally safe. And assumes always open for output.
sub safer_open {
my $name = shift;
my $fh = gensym;
open $fh, ">$name" or die "Can't create $name: $!";
*{$fh}->{SCALAR} = $name;
binmode $fh;
$fh;
}
sub safer_close {
my $fh = shift;
close $fh or die 'Error closing ' . *{$fh}->{SCALAR} . ": $!";
}
1;
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