#line 1 "File/Copy.pm"
# File/Copy.pm. Written in 1994 by Aaron Sherman <ajs@ajs.com>. This
# source code has been placed in the public domain by the author.
# Please be kind and preserve the documentation.
#
# Additions copyright 1996 by Charles Bailey.  Permission is granted
# to distribute the revised code under the same terms as Perl itself.

package File::Copy;

use 5.006;
use strict;
use warnings; no warnings 'newline';
use File::Spec;
use Config;
# During perl build, we need File::Copy but Scalar::Util might not be built yet
# And then we need these games to avoid loading overload, as that will
# confuse miniperl during the bootstrap of perl.
my $Scalar_Util_loaded = eval q{ require Scalar::Util; require overload; 1 };
our(@ISA, @EXPORT, @EXPORT_OK, $VERSION, $Too_Big, $Syscopy_is_copy);
sub copy;
sub syscopy;
sub cp;
sub mv;

$VERSION = '2.31';

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(copy move);
@EXPORT_OK = qw(cp mv);

$Too_Big = 1024 * 1024 * 2;

sub croak {
    require Carp;
    goto &Carp::croak;
}

sub carp {
    require Carp;
    goto &Carp::carp;
}

sub _catname {
    my($from, $to) = @_;
    if (not defined &basename) {
	require File::Basename;
	import  File::Basename 'basename';
    }

    return File::Spec->catfile($to, basename($from));
}

# _eq($from, $to) tells whether $from and $to are identical
sub _eq {
    my ($from, $to) = map {
        $Scalar_Util_loaded && Scalar::Util::blessed($_)
	    && overload::Method($_, q{""})
            ? "$_"
            : $_
    } (@_);
    return '' if ( (ref $from) xor (ref $to) );
    return $from == $to if ref $from;
    return $from eq $to;
}

sub copy {
    croak("Usage: copy(FROM, TO [, BUFFERSIZE]) ")
      unless(@_ == 2 || @_ == 3);

    my $from = shift;
    my $to = shift;

    my $size;
    if (@_) {
	$size = shift(@_) + 0;
	croak("Bad buffer size for copy: $size\n") unless ($size > 0);
    }

    my $from_a_handle = (ref($from)
			 ? (ref($from) eq 'GLOB'
			    || UNIVERSAL::isa($from, 'GLOB')
                            || UNIVERSAL::isa($from, 'IO::Handle'))
			 : (ref(\$from) eq 'GLOB'));
    my $to_a_handle =   (ref($to)
			 ? (ref($to) eq 'GLOB'
			    || UNIVERSAL::isa($to, 'GLOB')
                            || UNIVERSAL::isa($to, 'IO::Handle'))
			 : (ref(\$to) eq 'GLOB'));

    if (_eq($from, $to)) { # works for references, too
	carp("'$from' and '$to' are identical (not copied)");
        return 0;
    }

    if (!$from_a_handle && !$to_a_handle && -d $to && ! -d $from) {
	$to = _catname($from, $to);
    }

    if ((($Config{d_symlink} && $Config{d_readlink}) || $Config{d_link}) &&
	!($^O eq 'MSWin32' || $^O eq 'os2')) {
	my @fs = stat($from);
	if (@fs) {
	    my @ts = stat($to);
	    if (@ts && $fs[0] == $ts[0] && $fs[1] == $ts[1] && !-p $from) {
		carp("'$from' and '$to' are identical (not copied)");
                return 0;
	    }
	}
    }
    elsif (_eq($from, $to)) {
	carp("'$from' and '$to' are identical (not copied)");
	return 0;
    }

    if (defined &syscopy && !$Syscopy_is_copy
	&& !$to_a_handle
	&& !($from_a_handle && $^O eq 'os2' )	# OS/2 cannot handle handles
	&& !($from_a_handle && $^O eq 'MSWin32')
	&& !($from_a_handle && $^O eq 'NetWare')
       )
    {
        if ($^O eq 'VMS' && -e $from
            && ! -d $to && ! -d $from) {

            # VMS natively inherits path components from the source of a
            # copy, but we want the Unixy behavior of inheriting from
            # the current working directory.  Also, default in a trailing
            # dot for null file types.

            $to = VMS::Filespec::rmsexpand(VMS::Filespec::vmsify($to), '.');

            # Get rid of the old versions to be like UNIX
            1 while unlink $to;
        }

        return syscopy($from, $to) || 0;
    }

    my $closefrom = 0;
    my $closeto = 0;
    my ($status, $r, $buf);
    local($\) = '';

    my $from_h;
    if ($from_a_handle) {
       $from_h = $from;
    } else {
       open $from_h, "<", $from or goto fail_open1;
       binmode $from_h or die "($!,$^E)";
       $closefrom = 1;
    }

    # Seems most logical to do this here, in case future changes would want to
    # make this croak for some reason.
    unless (defined $size) {
	$size = tied(*$from_h) ? 0 : -s $from_h || 0;
	$size = 1024 if ($size < 512);
	$size = $Too_Big if ($size > $Too_Big);
    }

    my $to_h;
    if ($to_a_handle) {
       $to_h = $to;
    } else {
	$to_h = \do { local *FH }; # XXX is this line obsolete?
	open $to_h, ">", $to or goto fail_open2;
	binmode $to_h or die "($!,$^E)";
	$closeto = 1;
    }

    $! = 0;
    for (;;) {
	my ($r, $w, $t);
       defined($r = sysread($from_h, $buf, $size))
	    or goto fail_inner;
	last unless $r;
	for ($w = 0; $w < $r; $w += $t) {
           $t = syswrite($to_h, $buf, $r - $w, $w)
		or goto fail_inner;
	}
    }

    close($to_h) || goto fail_open2 if $closeto;
    close($from_h) || goto fail_open1 if $closefrom;

    # Use this idiom to avoid uninitialized value warning.
    return 1;

    # All of these contortions try to preserve error messages...
  fail_inner:
    if ($closeto) {
	$status = $!;
	$! = 0;
       close $to_h;
	$! = $status unless $!;
    }
  fail_open2:
    if ($closefrom) {
	$status = $!;
	$! = 0;
       close $from_h;
	$! = $status unless $!;
    }
  fail_open1:
    return 0;
}

sub cp {
    my($from,$to) = @_;
    my(@fromstat) = stat $from;
    my(@tostat) = stat $to;
    my $perm;

    return 0 unless copy(@_) and @fromstat;

    if (@tostat) {
        $perm = $tostat[2];
    } else {
        $perm = $fromstat[2] & ~(umask || 0);
	@tostat = stat $to;
    }
    # Might be more robust to look for S_I* in Fcntl, but we're
    # trying to avoid dependence on any XS-containing modules,
    # since File::Copy is used during the Perl build.
    $perm &= 07777;
    if ($perm & 06000) {
	croak("Unable to check setuid/setgid permissions for $to: $!")
	    unless @tostat;

	if ($perm & 04000 and                     # setuid
	    $fromstat[4] != $tostat[4]) {         # owner must match
	    $perm &= ~06000;
	}

	if ($perm & 02000 && $> != 0) {           # if not root, setgid
	    my $ok = $fromstat[5] == $tostat[5];  # group must match
	    if ($ok) {                            # and we must be in group
                $ok = grep { $_ == $fromstat[5] } split /\s+/, $)
	    }
	    $perm &= ~06000 unless $ok;
	}
    }
    return 0 unless @tostat;
    return 1 if $perm == ($tostat[2] & 07777);
    return eval { chmod $perm, $to; } ? 1 : 0;
}

sub _move {
    croak("Usage: move(FROM, TO) ") unless @_ == 3;

    my($from,$to,$fallback) = @_;

    my($fromsz,$tosz1,$tomt1,$tosz2,$tomt2,$sts,$ossts);

    if (-d $to && ! -d $from) {
	$to = _catname($from, $to);
    }

    ($tosz1,$tomt1) = (stat($to))[7,9];
    $fromsz = -s $from;
    if ($^O eq 'os2' and defined $tosz1 and defined $fromsz) {
      # will not rename with overwrite
      unlink $to;
    }

    if ($^O eq 'VMS' && -e $from
        && ! -d $to && ! -d $from) {

            # VMS natively inherits path components from the source of a
            # copy, but we want the Unixy behavior of inheriting from
            # the current working directory.  Also, default in a trailing
            # dot for null file types.

            $to = VMS::Filespec::rmsexpand(VMS::Filespec::vmsify($to), '.');

            # Get rid of the old versions to be like UNIX
            1 while unlink $to;
    }

    return 1 if rename $from, $to;

    # Did rename return an error even though it succeeded, because $to
    # is on a remote NFS file system, and NFS lost the server's ack?
    return 1 if defined($fromsz) && !-e $from &&           # $from disappeared
                (($tosz2,$tomt2) = (stat($to))[7,9]) &&    # $to's there
                  ((!defined $tosz1) ||			   #  not before or
		   ($tosz1 != $tosz2 or $tomt1 != $tomt2)) &&  #   was changed
                $tosz2 == $fromsz;                         # it's all there

    ($tosz1,$tomt1) = (stat($to))[7,9];  # just in case rename did something

    {
        local $@;
        eval {
            local $SIG{__DIE__};
            $fallback->($from,$to) or die;
            my($atime, $mtime) = (stat($from))[8,9];
            utime($atime, $mtime, $to);
            unlink($from)   or die;
        };
        return 1 unless $@;
    }
    ($sts,$ossts) = ($! + 0, $^E + 0);

    ($tosz2,$tomt2) = ((stat($to))[7,9],0,0) if defined $tomt1;
    unlink($to) if !defined($tomt1) or $tomt1 != $tomt2 or $tosz1 != $tosz2;
    ($!,$^E) = ($sts,$ossts);
    return 0;
}

sub move { _move(@_,\&copy); }
sub mv   { _move(@_,\&cp);   }

# &syscopy is an XSUB under OS/2
unless (defined &syscopy) {
    if ($^O eq 'VMS') {
	*syscopy = \&rmscopy;
    } elsif ($^O eq 'MSWin32' && defined &DynaLoader::boot_DynaLoader) {
	# Win32::CopyFile() fill only work if we can load Win32.xs
	*syscopy = sub {
	    return 0 unless @_ == 2;
	    return Win32::CopyFile(@_, 1);
	};
    } else {
	$Syscopy_is_copy = 1;
	*syscopy = \&copy;
    }
}

1;

__END__

#line 506

