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Edit File : Sys.pm \| Size : 7.79 KB
#============================================================================ # # AppConfig::Sys.pm # # Perl5 module providing platform-specific information and operations as # required by other AppConfig::* modules. # # Written by Andy Wardley <abw@wardley.org> # # Copyright (C) 1997-2003 Andy Wardley. All Rights Reserved. # Copyright (C) 1997,1998 Canon Research Centre Europe Ltd. # # $Id: Sys.pm,v 1.61 2004/02/04 10:11:23 abw Exp $ # #============================================================================ package AppConfig::Sys; use 5.006; use strict; use warnings; use POSIX qw( getpwnam getpwuid ); our $VERSION = '1.71'; our ($AUTOLOAD, $OS, %CAN, %METHOD); BEGIN { # define the methods that may be available if($^O =~ m/win32/i) { $METHOD{ getpwuid } = sub { return wantarray() ? ( (undef) x 7, getlogin() ) : getlogin(); }; $METHOD{ getpwnam } = sub { die("Can't getpwnam on win32"); }; } else { $METHOD{ getpwuid } = sub { getpwuid( defined $_[0] ? shift : $< ); }; $METHOD{ getpwnam } = sub { getpwnam( defined $_[0] ? shift : '' ); }; } # try out each METHOD to see if it's supported on this platform; # it's important we do this before defining AUTOLOAD which would # otherwise catch the unresolved call foreach my $method (keys %METHOD) { eval { &{ $METHOD{ $method } }() }; $CAN{ $method } = ! $@; } } #------------------------------------------------------------------------ # new($os) # # Module constructor. An optional operating system string may be passed # to explicitly define the platform type. # # Returns a reference to a newly created AppConfig::Sys object. #------------------------------------------------------------------------ sub new { my $class = shift; my $self = { METHOD => \%METHOD, CAN => \%CAN, }; bless $self, $class; $self->_configure(@_); return $self; } #------------------------------------------------------------------------ # AUTOLOAD # # Autoload function called whenever an unresolved object method is # called. If the method name relates to a METHODS entry, then it is # called iff the corresponding CAN_$method is set true. If the # method name relates to a CAN_$method value then that is returned. #------------------------------------------------------------------------ sub AUTOLOAD { my $self = shift; my $method; # splat the leading package name ($method = $AUTOLOAD) =~ s/.:://; # ignore destructor $method eq 'DESTROY' && return; # can_method() if ($method =~ s/^can_//i && exists $self->{ CAN }->{ $method }) { return $self->{ CAN }->{ $method }; } # method() elsif (exists $self->{ METHOD }->{ $method }) { if ($self->{ CAN }->{ $method }) { return &{ $self->{ METHOD }->{ $method } }(@_); } else { return undef; } } # variable elsif (exists $self->{ uc $method }) { return $self->{ uc $method }; } else { warn("AppConfig::Sys->", $method, "(): no such method or variable\n"); } return undef; } #------------------------------------------------------------------------ # _configure($os) # # Uses the first parameter, $os, the package variable $AppConfig::Sys::OS, # the value of $^O, or as a last resort, the value of # $Config::Config('osname') to determine the current operating # system/platform. Sets internal variables accordingly. #------------------------------------------------------------------------ sub _configure { my $self = shift; # operating system may be defined as a parameter or in $OS my $os = shift \|\| $OS; # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # The following was lifted (and adapated slightly) from Lincoln Stein's # CGI.pm module, version 2.36... # # FIGURE OUT THE OS WE'RE RUNNING UNDER # Some systems support the $^O variable. If not # available then require() the Config library unless ($os) { unless ($os = $^O) { require Config; $os = $Config::Config{'osname'}; } } if ($os =~ /win32/i) { $os = 'WINDOWS'; } elsif ($os =~ /vms/i) { $os = 'VMS'; } elsif ($os =~ /mac/i) { $os = 'MACINTOSH'; } elsif ($os =~ /os2/i) { $os = 'OS2'; } else { $os = 'UNIX'; } # The path separator is a slash, backslash or semicolon, depending # on the platform. my $ps = { UNIX => '/', OS2 => '\\', WINDOWS => '\\', MACINTOSH => ':', VMS => '\\' }->{ $os }; # # Thanks Lincoln! # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - $self->{ OS } = $os; $self->{ PATHSEP } = $ps; } #------------------------------------------------------------------------ # _dump() # # Dump internals for debugging. #------------------------------------------------------------------------ sub _dump { my $self = shift; print "=" x 71, "\n"; print "Status of AppConfig::Sys (Version $VERSION) object: $self\n"; print " Operating System : ", $self->{ OS }, "\n"; print " Path Separator : ", $self->{ PATHSEP }, "\n"; print " Available methods :\n"; foreach my $can (keys %{ $self->{ CAN } }) { printf "%20s : ", $can; print $self->{ CAN }->{ $can } ? "yes" : "no", "\n"; } print "=" x 71, "\n"; } 1; __END__ =pod =head1 NAME AppConfig::Sys - Perl5 module defining platform-specific information and methods for other AppConfig:: modules. =head1 SYNOPSIS use AppConfig::Sys; my $sys = AppConfig::Sys->new(); @fields = $sys->getpwuid($userid); @fields = $sys->getpwnam($username); =head1 OVERVIEW AppConfig::Sys is a Perl5 module provides platform-specific information and operations as required by other AppConfig::* modules. AppConfig::Sys is distributed as part of the AppConfig bundle. =head1 DESCRIPTION =head2 USING THE AppConfig::Sys MODULE To import and use the AppConfig::Sys module the following line should appear in your Perl script: use AppConfig::Sys; AppConfig::Sys is implemented using object-oriented methods. A new AppConfig::Sys object is created and initialised using the AppConfig::Sys->new() method. This returns a reference to a new AppConfig::Sys object. my $sys = AppConfig::Sys->new(); This will attempt to detect your operating system and create a reference to a new AppConfig::Sys object that is applicable to your platform. You may explicitly specify an operating system name to override this automatic detection: $unix_sys = AppConfig::Sys->new("Unix"); Alternatively, the package variable $AppConfig::Sys::OS can be set to an operating system name. The valid operating system names are: Win32, VMS, Mac, OS2 and Unix. They are not case-specific. =head2 AppConfig::Sys METHODS AppConfig::Sys defines the following methods: =over 4 =item getpwnam() Calls the system function getpwnam() if available and returns the result. Returns undef if not available. The can_getpwnam() method can be called to determine if this function is available. =item getpwuid() Calls the system function getpwuid() if available and returns the result. Returns undef if not available. The can_getpwuid() method can be called to determine if this function is available. =back =head1 AUTHOR Andy Wardley, E<lt>abw@wardley.orgE<gt> =head1 COPYRIGHT Copyright (C) 1997-2007 Andy Wardley. All Rights Reserved. Copyright (C) 1997,1998 Canon Research Centre Europe Ltd. This module is free software; you can redistribute it and/or modify it under the term of the Perl Artistic License. =head1 SEE ALSO AppConfig, AppConfig::File =cut Back

Edit File : Sys.pm | Size : 7.79 KB

#============================================================================
#
# AppConfig::Sys.pm
#
# Perl5 module providing platform-specific information and operations as 
# required by other AppConfig::* modules.
#
# Written by Andy Wardley <abw@wardley.org>
#
# Copyright (C) 1997-2003 Andy Wardley.  All Rights Reserved.
# Copyright (C) 1997,1998 Canon Research Centre Europe Ltd.
#
# $Id: Sys.pm,v 1.61 2004/02/04 10:11:23 abw Exp $
#
#============================================================================

package AppConfig::Sys;
use 5.006;
use strict;
use warnings;
use POSIX qw( getpwnam getpwuid );

our $VERSION = '1.71';
our ($AUTOLOAD, $OS, %CAN, %METHOD);

BEGIN {
    # define the methods that may be available
    if($^O =~ m/win32/i) {
        $METHOD{ getpwuid } = sub { 
            return wantarray() 
                ? ( (undef) x 7, getlogin() )
                : getlogin(); 
        };
        $METHOD{ getpwnam } = sub { 
            die("Can't getpwnam on win32"); 
        };
    }
    else
    {
        $METHOD{ getpwuid } = sub { 
            getpwuid( defined $_[0] ? shift : $< ); 
        };
        $METHOD{ getpwnam } = sub { 
            getpwnam( defined $_[0] ? shift : '' );
        };
    }

# try out each METHOD to see if it's supported on this platform;
    # it's important we do this before defining AUTOLOAD which would
    # otherwise catch the unresolved call
    foreach my $method  (keys %METHOD) {
        eval { &{ $METHOD{ $method } }() };
    	$CAN{ $method } = ! $@;
    }
}

#------------------------------------------------------------------------
# new($os)
#
# Module constructor.  An optional operating system string may be passed
# to explicitly define the platform type.
#
# Returns a reference to a newly created AppConfig::Sys object.
#------------------------------------------------------------------------

sub new {
    my $class = shift;

my $self = {
        METHOD => \%METHOD,
        CAN    => \%CAN,
    };

bless $self, $class;

$self->_configure(@_);
	
    return $self;
}

#------------------------------------------------------------------------
# AUTOLOAD
#
# Autoload function called whenever an unresolved object method is 
# called.  If the method name relates to a METHODS entry, then it is 
# called iff the corresponding CAN_$method is set true.  If the 
# method name relates to a CAN_$method value then that is returned.
#------------------------------------------------------------------------

sub AUTOLOAD {
    my $self = shift;
    my $method;

# splat the leading package name
    ($method = $AUTOLOAD) =~ s/.*:://;

# ignore destructor
    $method eq 'DESTROY' && return;

# can_method()
    if ($method =~ s/^can_//i && exists $self->{ CAN }->{ $method }) {
        return $self->{ CAN }->{ $method };
    }
    # method() 
    elsif (exists $self->{ METHOD }->{ $method }) {
        if ($self->{ CAN }->{ $method }) {
            return &{ $self->{ METHOD }->{ $method } }(@_);
        }
        else {
            return undef;
        }
    } 
    # variable
    elsif (exists $self->{ uc $method }) {
        return $self->{ uc $method };
    }
    else {
        warn("AppConfig::Sys->", $method, "(): no such method or variable\n");
    }

return undef;
}

#------------------------------------------------------------------------
# _configure($os)
#
# Uses the first parameter, $os, the package variable $AppConfig::Sys::OS,
# the value of $^O, or as a last resort, the value of
# $Config::Config('osname') to determine the current operating
# system/platform.  Sets internal variables accordingly.
#------------------------------------------------------------------------

sub _configure {
    my $self = shift;

# operating system may be defined as a parameter or in $OS
    my $os = shift || $OS;

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
    # The following was lifted (and adapated slightly) from Lincoln Stein's 
    # CGI.pm module, version 2.36...
    #
    # FIGURE OUT THE OS WE'RE RUNNING UNDER
    # Some systems support the $^O variable.  If not
    # available then require() the Config library
    unless ($os) {
	unless ($os = $^O) {
	    require Config;
	    $os = $Config::Config{'osname'};
	}
    }
    if ($os =~ /win32/i) {
        $os = 'WINDOWS';
    } elsif ($os =~ /vms/i) {
        $os = 'VMS';
    } elsif ($os =~ /mac/i) {
        $os = 'MACINTOSH';
    } elsif ($os =~ /os2/i) {
        $os = 'OS2';
    } else {
        $os = 'UNIX';
    }

# The path separator is a slash, backslash or semicolon, depending
    # on the platform.
    my $ps = {
        UNIX      => '/',
        OS2       => '\\',
        WINDOWS   => '\\',
        MACINTOSH => ':',
        VMS       => '\\'
    }->{ $os };
    #
    # Thanks Lincoln!
    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

$self->{ OS      } = $os;
    $self->{ PATHSEP } = $ps;
}

#------------------------------------------------------------------------
# _dump()
#
# Dump internals for debugging.
#------------------------------------------------------------------------

sub _dump {
    my $self = shift;

print "=" x 71, "\n";
    print "Status of AppConfig::Sys (Version $VERSION) object: $self\n";
    print "    Operating System : ", $self->{ OS      }, "\n";
    print "      Path Separator : ", $self->{ PATHSEP }, "\n";
    print "   Available methods :\n";
    foreach my $can (keys %{ $self->{ CAN } }) {
        printf "%20s : ", $can;
        print  $self->{ CAN }->{ $can } ? "yes" : "no", "\n";
    }
    print "=" x 71, "\n";
}

__END__

=pod

=head1 NAME

AppConfig::Sys - Perl5 module defining platform-specific information and methods for other AppConfig::* modules.

=head1 SYNOPSIS

use AppConfig::Sys;
    my $sys = AppConfig::Sys->new();

@fields = $sys->getpwuid($userid);
    @fields = $sys->getpwnam($username);

=head1 OVERVIEW

AppConfig::Sys is a Perl5 module provides platform-specific information and
operations as required by other AppConfig::* modules.

AppConfig::Sys is distributed as part of the AppConfig bundle.

=head1 DESCRIPTION

=head2 USING THE AppConfig::Sys MODULE

To import and use the AppConfig::Sys module the following line should
appear in your Perl script:

use AppConfig::Sys;

AppConfig::Sys is implemented using object-oriented methods.  A new
AppConfig::Sys object is created and initialised using the
AppConfig::Sys->new() method.  This returns a reference to a new
AppConfig::Sys object.

my $sys = AppConfig::Sys->new();

This will attempt to detect your operating system and create a reference to
a new AppConfig::Sys object that is applicable to your platform.  You may 
explicitly specify an operating system name to override this automatic 
detection:

$unix_sys = AppConfig::Sys->new("Unix");

Alternatively, the package variable $AppConfig::Sys::OS can be set to an
operating system name.  The valid operating system names are: Win32, VMS,
Mac, OS2 and Unix.  They are not case-specific.

=head2 AppConfig::Sys METHODS

AppConfig::Sys defines the following methods:

=over 4

=item getpwnam()

Calls the system function getpwnam() if available and returns the result.
Returns undef if not available.  The can_getpwnam() method can be called to
determine if this function is available.

=item getpwuid()

Calls the system function getpwuid() if available and returns the result.
Returns undef if not available.  The can_getpwuid() method can be called to
determine if this function is available.

=back

=head1 AUTHOR

Andy Wardley, E<lt>abw@wardley.orgE<gt>

=head1 COPYRIGHT

This module is free software; you can redistribute it and/or modify it under 
the term of the Perl Artistic License.

=head1 SEE ALSO

AppConfig, AppConfig::File

=cut

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