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            }
            else {
                $runperl .= qq ( -e '$prog' );
            }
        }
    } elsif (defined $args{progfile}) {
	$runperl .= qq( "$args{progfile}");
    } else {
	# You probaby didn't want to be sucking in from the upstream stdin
	die "test.pl:runperl(): none of prog, progs, progfile, args, "
	    . " switches or stdin specified"
	    unless defined $args{args} or defined $args{switches}
		or defined $args{stdin};
    }
    if (defined $args{stdin}) {
	# so we don't try to put literal newlines and crs onto the
	# command line.
	$args{stdin} =~ s/\n/\\n/g;
	$args{stdin} =~ s/\r/\\r/g;

	if ($is_mswin || $is_netware || $is_vms) {
	    $runperl = qq{$^X -e "print qq(} .
		$args{stdin} . q{)" | } . $runperl;
	}
	elsif ($is_macos) {
	    # MacOS can only do two processes under MPW at once;
	    # the test itself is one; we can't do two more, so
	    # write to temp file
	    my $stdin = qq{$^X -e 'print qq(} . $args{stdin} . qq{)' > teststdin; };
	    if ($args{verbose}) {
		my $stdindisplay = $stdin;
		$stdindisplay =~ s/\n/\n\#/g;
		print STDERR "# $stdindisplay\n";
	    }
	    `$stdin`;
	    $runperl .= q{ < teststdin };
	}
	else {
	    $runperl = qq{$^X -e 'print qq(} .
		$args{stdin} . q{)' | } . $runperl;
	}
    }
    if (defined $args{args}) {
	_quote_args(\$runperl, $args{args});
    }
    $runperl .= ' 2>&1'          if  $args{stderr} && !$is_mswin && !$is_macos;
    $runperl .= " \xB3 Dev:Null" if !$args{stderr} && $is_macos;
    if ($args{verbose}) {
	my $runperldisplay = $runperl;
	$runperldisplay =~ s/\n/\n\#/g;
	print STDERR "# $runperldisplay\n";
    }
    return $runperl;
}

sub runperl {
    die "test.pl:runperl() does not take a hashref"
	if ref $_[0] and ref $_[0] eq 'HASH';
    my $runperl = &_create_runperl;
    # ${^TAINT} is invalid in perl5.00505
    my $tainted;
    eval '$tainted = ${^TAINT};' if $] >= 5.006;
    my %args = @_;
    exists $args{switches} && grep m/^-T$/, @{$args{switches}} and $tainted = $tainted + 1;

    if ($tainted) {
	# We will assume that if you're running under -T, you really mean to
	# run a fresh perl, so we'll brute force launder everything for you
	my $sep;

	eval "require Config; Config->import";
	if ($@) {
	    warn "test.pl had problems loading Config: $@";
	    $sep = ':';
	} else {
	    $sep = $Config{path_sep};
	}

	my @keys = grep {exists $ENV{$_}} qw(CDPATH IFS ENV BASH_ENV);
	local @ENV{@keys} = ();
	# Untaint, plus take out . and empty string:
	local $ENV{'DCL$PATH'} = $1 if $is_vms && ($ENV{'DCL$PATH'} =~ /(.*)/s);
	$ENV{PATH} =~ /(.*)/s;
	local $ENV{PATH} =
	    join $sep, grep { $_ ne "" and $_ ne "." and -d $_ and
		($is_mswin or $is_vms or !(stat && (stat _)[2]&0022)) }
		    split quotemeta ($sep), $1;
	$ENV{PATH} .= "$sep/bin" if $is_cygwin;  # Must have /bin under Cygwin

	$runperl =~ /(.*)/s;
	$runperl = $1;

        my ($err,$result,$stderr) = run_cmd($runperl, $args{timeout});
	$result =~ s/\n\n/\n/ if $is_vms; # XXX pipes sometimes double these
	return $result;
    } else {
        my ($err,$result,$stderr) = run_cmd($runperl, $args{timeout});
	$result =~ s/\n\n/\n/ if $is_vms; # XXX pipes sometimes double these
	return $result;
    }
}

*run_perl = \&runperl; # Nice alias.

sub DIE {
    print STDERR "# @_\n";
    exit 1;
}

# A somewhat safer version of the sometimes wrong $^X.
my $Perl;
sub which_perl {
    unless (defined $Perl) {
	$Perl = $^X;

	# VMS should have 'perl' aliased properly
	return $Perl if $^O eq 'VMS';

	my $exe;
	eval "require Config; Config->import";
	if ($@) {
	    warn "test.pl had problems loading Config: $@";
	    $exe = '';
	} else {
	    $exe = $Config{exe_ext};
	}
       $exe = '' unless defined $exe;

	# This doesn't absolutize the path: beware of future chdirs().
	# We could do File::Spec->abs2rel() but that does getcwd()s,
	# which is a bit heavyweight to do here.

	if ($Perl =~ /^perl\Q$exe\E$/i) {
	    my $perl = "perl$exe";
	    eval "require File::Spec";
	    if ($@) {
		warn "test.pl had problems loading File::Spec: $@";
		$Perl = "./$perl";
	    } else {
		$Perl = File::Spec->catfile(File::Spec->curdir(), $perl);
	    }