xboard 4.5.3-1 / usr / games / cmail

#! /usr/bin/perl
## (configure will change the top line to the location of perl on your system)
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## cmail: a tool to aid playing chess by email
## Copyright (C) 1993,2009, 2010, 2011  Free Software Foundation, Inc.
## 
##  cmail is free software: you can redistribute it and/or modify
##  it under the terms of the GNU General Public License as published by
##  the Free Software Foundation, either version 3 of the License, or (at
##  your option) any later version.
## 
##  cmail is distributed in the hope that it will be useful, but
##  WITHOUT ANY WARRANTY; without even the implied warranty of
##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
##  General Public License for more details.
## 
##  You should have received a copy of the GNU General Public License
##  along with this program. If not, see http://www.gnu.org/licenses/.  *
##
## Email:     evan@quadstone.co.uk
## Snailmail: Evan Welsh
##            Quadstone Ltd
##            16 Chester Street
##            Edinburgh EH3 7RA
##            Scotland
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Print verbose diagnostics for debugging
sub debug {
    if ($DEBUG) {
	local ($old) = select ;	## Remember selected output
	select (logfile) ;
	$| = 1 ;		## Keep it flushed
	print @_ ;		## Print arguments
	select ($old) ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Create a directory for storing games in if it doesn't already exist
sub need_chess_dir {
    local ($old) ;

    ## ################################################################# ##
    ## Check for existence of the named chess directory
    ## ################################################################# ##

    if (! (-d "$CMAILDIR")) {

	## ############################################################# ##
	## Ask user for confirmation if attached to tty
	## ############################################################# ##

	if (-t) {
	    $old = select ;	## Remember selected output
	    select (stdout) ;	## Write to standard output
	    $| = 1 ;		## Keep it flushed
	    print (  "CMail directory \"$CMAILDIR\" does not exist."
		   . " Create it? [y/q]: ") ;

	    $_ = <tty> ;	## Read response from tty
	    die "Bye!\n" if (/^[qQ].*/) ; ## Quit if q selected

	    select ($old) ;	## Re-select the old output
	}

	## ############################################################# ##
	## Create a cmail directory or die
	## ############################################################# ##

	die "cmail: Can't create CMail directory: \"$CMAILDIR\"\n"
	    unless mkdir ("$CMAILDIR", 511) ;
	print (  "Created cmail directory \"$CMAILDIR\".\n"
	       . "You can move it but remember to set the CMAIL_DIR"
	       . " environment variable.\n") ;
    }

    ## ################################################################# ##
    ## Change to the $CMAILDIR directory whether newly created or not
    ## ################################################################# ##

    die "Couldn't changed directory to \"$CMAILDIR\"\n"
	unless (chdir "$CMAILDIR") ;

    ## ################################################################# ##
    ## Check for existence of the named chess directory
    ## ################################################################# ##

    if (! (-d "$ARCDIR")) {

	## ############################################################# ##
	## Ask user for confirmation if attached to tty
	## ############################################################# ##

	if (-t) {
	    $old = select ;	## Remember selected output
	    select (stdout) ;	## Write to standard output
	    $| = 1 ;		## Keep it flushed
	    print (  "Archive directory \"$ARCDIR\" does not exist."
		   . " Create it? [y/q]: ") ;

	    $_ = <tty> ;	## Read response from tty
	    die "Bye!\n" if (/^[qQ].*/) ; ## Quit if q selected

	    select ($old) ;	## Re-select the old output
	}

	## ############################################################# ##
	## Create a chess directory or die
	## ############################################################# ##

	die "cmail: Can't create archive directory: \"$ARCDIR\"\n"
	    unless mkdir ("$ARCDIR", 511) ;
	print (  "Created archive directory \"$ARCDIR\".\n"
	       . "You can move it but remember to set the CMAIL_ARCDIR"
	       . " environment variable.\n") ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Parse command-line arguments
sub parse_flags {
    ## ################################################################# ##
    ## Set up defaults from the environment or from hard-wired constants
    ## ################################################################# ##

    $SHOWC       = 0 ;
    $SHOWW       = 0 ;
    $OUTPUT_POS  = $ENV{'CMAIL_OUTPUT_POS'} ;
    $LOGFILE     = $ENV{'CMAIL_LOGFILE'} ;
    $MAILPROG    = $ENV{'CMAIL_MAILPROG'} ;
    $MAILPROG    = "/usr/sbin/sendmail" if (   (-x "/usr/sbin/sendmail")
					    && (! $MAILPROG)) ;
    $MAILPROG    = "/usr/lib/sendmail" if (   (-x "/usr/lib/sendmail")
					   && (! $MAILPROG)) ;
    $MAILPROG    = "/etc/sendmail" if (   (-x "/usr/lib/sendmail")
					   && (! $MAILPROG)) ;
    $MAILPROG    = "/usr/ucb/Mail" if (   (-x "/usr/ucb/Mail")
				       && (! $MAILPROG)) ;
    $MAILPROG    = "/usr/ucb/mail" if (   (-x "/usr/ucb/mail")
				       && (! $MAILPROG)) ;
    $MAILPROG    = "Mail" unless ($MAILPROG) ;
    $HOMEDIR     = $ENV{'HOME'} ;
    $CMAILDIR	 = $ENV{'CMAIL_DIR'} ;
    $CMAILDIR	 = $ENV{'CHESSDIR'} unless ($CMAILDIR) ;
    $CMAILDIR	 = "$HOMEDIR/Chess" unless ($CMAILDIR) ;
    $CMAILDIR	 = "~/Chess"        unless ($HOMEDIR) ;
    $NUM_GAMES	 = "?" ;
    $NUM_WGAMES	 = "?" ;
    $NUM_BGAMES	 = "?" ;
    $TIME_DELAY	 = $ENV{'CMAIL_TIME_DELAY'} ;
    $TIME_DELAY	 = 0 unless ($TIME_DELAY) ;
    $PW_NAME     = &get_pw_name () ;
    $MY_NNAME	 = $PW_NAME ;
    $MY_NNAME	 = $ENV{'LOGNAME'} unless ($MY_NNAME) ;
    $MY_NNAME	 = $ENV{'USER'} unless ($MY_NNAME) ;
    $MY_NNAME	 = "?" unless ($MY_NNAME) ;
    $PGN_EVENT   = "Email correspondence game" ;
    $PGN_SITE	 = "NET";
    $PGN_ROUND	 = "-";
    $PGN_MODE    = "EM";
    $SEND_MAIL   = 1 ;
    $REMAIL      = 0 ;
    $LOAD_XBOARD = 1 unless $ENV{'CMAIL_NO_XBOARD'} ;
    $REUSE       = 1 ;
    @TD_FLAGS    = ("-td", $TIME_DELAY) ;
    @NCP_FLAGS   = ("-ncp") ;

    ## ################################################################# ##
    ## Define the usage string
    ## ################################################################# ##

    $USAGE = ("cmail
        [-h] [-c] [-w] [-[x]v] [-[x]mail] [-[x]xboard] [-[x]reuse] [-remail] 
        [-game <name>] [-(w|b|)games <number>] [-(me|opp) <short name>]
        [-(w|b|my|opp)name <full name>] [-(w|b|my|opp)na <email>]
        [-dir <directory>] [-arcdir <directory>] [-mailprog <mail program>]
        [-logFile <file>] [-event <event>] [-site <site>] [-round <round>]
	[-mode <mode>]") ;

    ## ################################################################# ##
    ## Overwrite defaults if specified on the command-line
    ## ################################################################# ##

    @UNREC_ARGS = () ;
    while ($ARGV = shift) {
	$UNREC = 0 if ($ARGV =~ /^-/) ;
	if    ("$ARGV" eq "-h")		  {die ("Usage: $USAGE\n")     ;}
	elsif ("$ARGV" eq "-c")		  {$SHOWC       = 1            ;}
	elsif ("$ARGV" eq "-w")		  {$SHOWW       = 1            ;}
	elsif ("$ARGV" eq "-v")		  {$DEBUG       = 1            ;
				           @DEBUG_FLAGS = ("-debug")   ;}
	elsif ("$ARGV" eq "-xv")	  {$DEBUG       = 0            ;
				           $QUIET       = 1            ;}
	elsif ("$ARGV" eq "-mail")	  {$SEND_MAIL   = 1            ;}
	elsif ("$ARGV" eq "-xmail")	  {$SEND_MAIL   = 0            ;}
	elsif ("$ARGV" eq "-xboard")	  {$LOAD_XBOARD = 1            ;}
	elsif ("$ARGV" eq "-xxboard")	  {$LOAD_XBOARD = 0            ;}
	elsif ("$ARGV" eq "-reuse")	  {$REUSE       = 1            ;}
	elsif ("$ARGV" eq "-xreuse")	  {$REUSE       = 0            ;}
	elsif ("$ARGV" eq "-remail")      {$LOAD_XBOARD = 0            ;
					   $SEND_MAIL   = 1            ;
					   $REMAIL      = 1            ;}
	elsif ("$ARGV" eq "-game")	  {$PGN_GAME    = shift        ;}
	elsif ("$ARGV" eq "-games")       {$NUM_GAMES   = shift        ;}
	elsif ("$ARGV" eq "-wgames")      {$NUM_WGAMES  = shift        ;}
	elsif ("$ARGV" eq "-bgames")      {$NUM_BGAMES  = shift        ;}
	elsif ("$ARGV" eq "-me")	  {$MY_NNAME    = shift        ;}
	elsif ("$ARGV" eq "-opp")	  {$OPP_NNAME   = shift        ;}
	elsif ("$ARGV" eq "-myname")	  {$MY_FNAME    = shift        ;}
	elsif ("$ARGV" eq "-oppname")	  {$OPP_FNAME   = shift        ;}
	elsif ("$ARGV" eq "-wname")	  {$WHITE_FNAME	= shift	       ;}
	elsif ("$ARGV" eq "-bname")	  {$BLACK_FNAME	= shift	       ;}
	elsif ("$ARGV" eq "-myna")	  {$MY_ADDRESS  = shift        ;}
	elsif ("$ARGV" eq "-oppna")	  {$OPP_ADDRESS = shift        ;}
	elsif ("$ARGV" eq "-wna")	  {$WHITENA	= shift	       ;}
	elsif ("$ARGV" eq "-bna")	  {$BLACKNA	= shift	       ;}
	elsif ("$ARGV" eq "-dir")	  {$CMAILDIR    = shift        ;}
	elsif ("$ARGV" eq "-arcdir")	  {$ARCDIR      = shift        ;}
	elsif ("$ARGV" eq "-mailprog")	  {$MAILPROG    = shift        ;}
	elsif ("$ARGV" eq "-logFile")     {$LOGFILE     = shift        ;}
	elsif ("$ARGV" =~ /^-(td|timeDelay)$/)
	                                  {@TD_FLAGS    = ($ARGV,
							   shift)      ;}
	elsif ("$ARGV" =~ /^-noChessComputer$/)
	                                  {@NCP_FLAGS   = ($ARGV,
							   shift)      ;}
	elsif ("$ARGV" =~ /^-[x]?ncp$/)	  {@NCP_FLAGS	= ($ARGV)      ;}
	elsif ("$ARGV" eq "-event")	  {$PGN_EVENT	= shift        ;}
	elsif ("$ARGV" eq "-site")	  {$PGN_SITE	= shift        ;}
	elsif ("$ARGV" eq "-round")	  {$PGN_ROUND	= shift        ;}
	elsif ("$ARGV" eq "-mode")	  {$PGN_MODE	= shift        ;}
	elsif ("$ARGV" =~ /^-/ || $UNREC) {
	    push(@UNREC_ARGS, $ARGV) ;
	    $UNREC = 1 ;
	} else {
	    die("cmail: Unrecognised flag \"$ARGV\"\nUsage: $USAGE\n") ;
	}
    }

    ## ################################################################# ##
    ## Assign a value to $ARCDIR if not specified on the command line
    ## ################################################################# ##

    $ARCDIR = $ENV{'CMAIL_ARCDIR'} unless ($ARCDIR) ;
    $ARCDIR = $CMAILDIR unless ($ARCDIR) ;
    $ENV{'CMAIL_ARCDIR'} = $ARCDIR ; ## Make sure this is set for xboard

    ## ################################################################# ##
    ## Propagate some CMAIL variables through xboard to the cmail
    ## grandchild so that it uses the same important variables as this one
    ## ################################################################# ##

    $ENV{'CMAIL_MAILPROG'} = $MAILPROG ;
    $ENV{'CMAIL_DIR'}      = $CMAILDIR ;
    $ENV{'CHESSDIR'}       = $CMAILDIR ; ## Make xboard use $CMAILDIR
    $ENV{'CMAIL_ARCDIR'}   = $ARCDIR ;
    if ($LOGFILE) {
	$ENV{'CMAIL_LOGFILE'}  = $LOGFILE ;
    } else {
	$LOGFILE = "&STDERR" ;
    }

    ## ################################################################# ##
    ## Work out how many games of each colour will be played
    ## ################################################################# ##

    die "cmail: Illegal number of games: $NUM_GAMES\n"
	if ($NUM_GAMES < 0) ;
    die "cmail: Illegal number of white games: $NUM_WGAMES\n"
	if ($NUM_WGAMES < 0) ;
    die "cmail: Illegal number of black games: $NUM_BGAMES\n"
	if ($NUM_BGAMES < 0) ;
    if ("$NUM_GAMES" ne "?") {
	if ("$NUM_WGAMES" eq "?") {
	    if ("$NUM_BGAMES" eq "?") {
		$NUM_BGAMES = int($NUM_GAMES / 2) ;
	    }
	    $NUM_WGAMES = $NUM_GAMES - $NUM_BGAMES ;
	} elsif ("$NUM_BGAMES" eq "?") {
	    $NUM_BGAMES = $NUM_GAMES - $NUM_WGAMES ;
	}
    } elsif ("$NUM_WGAMES" eq "?") {
	if ("$NUM_BGAMES" eq "?") {
	    $NUM_GAMES  = 1 ;
	    $NUM_WGAMES = 1 ;
	    $NUM_BGAMES = 0 ;
	} else {
	    $NUM_GAMES  = $NUM_BGAMES ;
	    $NUM_WGAMES = 0 ;
	}
    } else {
	if ("$NUM_BGAMES" eq "?") {
	    $NUM_GAMES  = $NUM_WGAMES ;
	    $NUM_BGAMES = 0 ;
	} else {
	    $NUM_GAMES  = $NUM_WGAMES + $NUM_BGAMES ;
	}
    }
    die "cmail: Illegal number of games: $NUM_GAMES\n"
	if ("$NUM_GAMES" eq "0") ;
    die (  "cmail: Inconsistent numbers of games specified:"
	 . " $NUM_WGAMES + $NUM_BGAMES != $NUM_GAMES\n")
	unless ($NUM_GAMES == $NUM_WGAMES + $NUM_BGAMES) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Initialisation of variables and environment
sub showGPL {
    ## ################################################################# ##
    ## Show copyright notice
    ## ################################################################# ##

    while (<DATA>) {
	last if (/^{END OF GPL COPYRIGHT}$/) ;
	s/\$Revision[:] (.*) \$/$1/ ;
	print ;
    }

    ## ################################################################# ##
    ## Show conditions if requested
    ## ################################################################# ##

    while (<DATA>) {
	last if (/^{END OF GPL CONDITIONS}$/) ;
	print if ($SHOWW) ;
    }

    ## ################################################################# ##
    ## Show warranty if requested
    ## ################################################################# ##

    if ($SHOWC) {
	print "\n" if ($SHOWW) ;
	print while (<DATA>) ;
    }

    
    exit 0 if ($SHOWC || $SHOWW) ; ## Abort if showed conditions or warranty
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Initialisation of variables and environment
sub initialise {
    local ($p) = "[.PRNBQKprnbqk]" ;
    local ($l) = "$p $p $p $p $p $p $p $p\n" ;
    local ($board) = "$l$l$l$l$l$l$l$l" ;
    local ($tp) = ".* to play\n" ;
    $posdiag = "\{--------------\n$board$tp--------------\}\n+" ;

    &parse_flags (@ARGV) ;	## Parse command-line arguments

    &showGPL unless $QUIET ;

    open (tty, "< /dev/tty") ;	## Open tty for reading

    &need_chess_dir () ;	## Check for the existence of CMAILDIR

    open (logfile, ">$LOGFILE") if ($DEBUG) ; ## Default is STDERR

    &debug ("Called <initialise>\n") ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for a game name, if <cr> use a default
sub prompt_for_game_name {
    &debug ("Called <prompt_for_game_name>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout);		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed

    print "Game name [<cr> to use default]: " ;
    die "cmail: tty not open\n" unless (-t) ;
    <tty> =~ /(.*)/ ;		## Read line from tty
    $PGN_GAME = "$1" ;		## Assign to game name
    
    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for opponent's address
sub prompt_for_opp_address {
    &debug ("Called <prompt_for_opp_address>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout);		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed

    ## ################################################################# ##
    ## Prompt for opponent's email address
    ## ################################################################# ##

    print "Opponent's email address: " ;
    die "cmail: tty not open\n" unless (-t) ;
    <tty> =~ /(.*)/ ;
    $OPP_ADDRESS = $1 ;

    ## ################################################################# ##
    ## Use name as default if still blank
    ## ################################################################# ##

    $OPP_ADDRESS = $OPP_NNAME if ("" eq $OPP_ADDRESS) ;
    
    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for opponent's name
sub prompt_for_opp_name {
    &debug ("Called <prompt_for_opp_name>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout) ;		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed
    print "Opponent's name: " ;

    die "cmail: tty not open\n" unless (-t) ; ## Check tty is open
    <tty> =~ /(.*)/ ;		## Read line from tty
    $OPP_NNAME = $1 ;		## Match!
    die "cmail: Can't proceed without the opponent's name.\n"
	unless ($OPP_NNAME) ;

    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for move
sub prompt_for_move {
    local ($prompt) = shift ;
    local ($pattern) = shift ;
    &debug ("Called <prompt_for_move>\n") ;

    local ($move) = "" ;
    local ($old) = select ;	## Remember the selected output
    select (stdout) ;		## Write to stdout
    $| = 1 ;			## Keep it flushed
    die "cmail: tty not open\n" unless (-t) ; ## Check tty is open

    do {
	print $prompt ;
	<STDIN> =~ /(.*)/ ;	## Read line from tty
	$move = $1 ;		## Match!
    } until ($move =~ /^$pattern$/) ;

    select ($old) ;		## Re-select the old output
    return ($move) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Load the game
sub play_game {
    &debug ("Called <play_game>\n") ;

    $| = 1 ;			## Start flushing output buffer

    ## ################################################################# ##
    ## Load xboard unless inhibited by command-line arguments
    ## ################################################################# ##

    if (($STARTING_NEW_GAME) && ($NUM_WGAMES == 0)) {
	print (  "Bypassing xboard and mailing $NUM_BGAMES empty"
	       . " black games.\n") ;
    } elsif ($LOAD_XBOARD) {
	## ############################################################# ##
	## Remove output file from previous run, but preserve
	## $PGN_GAME.game.out.* because they will be empty black games
	## ############################################################# ##

	unlink "$PGN_GAME.out" ;

	## ############################################################# ##
	## Invoke xboard with loads of flags
	## ############################################################# ##

	if ($PGN_GAME) {
	    if (@ARCHIVE) {
		local ($date) = &get_date_from_games (@ARCHIVE) ;
		$XBOARD_ARGS = join (' ', (("-lgf",
					    "'$ARCDIR/$PGN_GAME.$date.archive'"),
					   @NCP_FLAGS,
					   "-xics",
					   @TD_FLAGS,
					   @DEBUG_FLAGS,
					   @UNREC_ARGS)) ;
	    } else {
		$XBOARD_ARGS = join (' ', (("-cmail", "'$PGN_GAME'"),
					   @TD_FLAGS,
					   @NCP_FLAGS,
					   "-xics",
					   @DEBUG_FLAGS,
					   @UNREC_ARGS)) ;
	    }
	} else {
	    $PGN_GAME = "unknown.cmail" ;
	    $XBOARD_ARGS = join (' ', (("-lgf", "'$PGN_GAME'"),
				       @NCP_FLAGS,
				       "-xics",
				       @TD_FLAGS,
				       @DEBUG_FLAGS,
				       @UNREC_ARGS)) ;
	    $REUSE = 0 ;
	}

	$LOG_FILE = "$PGN_GAME.log" ;
	&debug ("Invoking xboard with args: $XBOARD_ARGS\n") ;
	$PID_FILE = "$PGN_GAME.pid" ;
	if (   (! $REUSE)
	    || (! (   (-f $PID_FILE)
		   && ($XBOARD_PID = `cat '$PID_FILE'`)
		   && ("$XBOARD_PID" =~ /^\d+$/)
		   && (kill "SIGUSR1", $XBOARD_PID)))) {
	    print "Loading xboard for game \"$PGN_GAME\"..." ;
#  	    system ("gdb xboard") ;
	    system (  "{ ({ xboard $XBOARD_ARGS & } ;"
		    . "   echo \$! > '$PID_FILE' ;"
		    . "   wait ;"
		    . "   rm '$PID_FILE') & } >'$LOG_FILE' 2>&1") ;
	    print (  "done.\n"
		   . "If nothing happens look for an error message in\n"
		   . "$CMAILDIR/$LOG_FILE\n") ;
	} else {
	    print ("Revived existing xboard for game \"$PGN_GAME\".\n"
		   . "If nothing happens"
		   . " remove $CMAILDIR/$PID_FILE and try again.\n") ;
	}

	return 1 ;
    }
    return 0 ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Enter moves on tty instead of xboard
sub play_on_tty {
    &debug ("Called <play_on_tty>\n") ;

    local (@results) = @_ ;

    local (@games, $game, $to_play) ;

    ## ################################################################# ##
    ## Check we have access to tty
    ## ################################################################# ##

    if (open(STDIN, '/dev/tty')) {
	## ############################################################# ##
	## Read in games
	## ############################################################# ##
	
	local ($infile) = "$PGN_GAME.game.in" ;
	if (-f $infile) {
	    @games = &get_games_from_file($infile) ;
	    &debug ("Read in games from \"$infile\"\n") ;

	    if (@results) {
		foreach $game (@games) {
		    $result = shift (@results) ;
		    if ($result && ($game =~ /\[Result\s+"[^*]+"\]/)) {
			$game = "" ;
		    }
		}
	    }

	    ## ################################################################# ##
	    ## Accept move on tty for each game in turn
	    ## ################################################################# ##
		
	    local ($comment_orig, $comment, $comment_line,
		   $pos, $move, $normal_move, $action, $result) ;

	    foreach $game (@games) {
		next unless $game ;

		$game =~ s/[\s\n]*[*]?[\s\n]*$// ;
		$pos = "" ;
		$pos = $1 if ($game =~ s/($posdiag)//) ;
		print $game, "\n\n", $pos ;

		($number, $to_play) = &get_to_play ($game) ;

		$comment_orig = "" ;
		$game_nocomment = $game ;
		if ($game_nocomment =~ s/\n?{\n?([^{]*)}$//) {
		    $comment_orig = $1 ;
		    $comment_orig =~ s/([^\n])$/$1\n/ ;
#  		    &debug ("Comment is:\n{\n$comment_orig}\n") ;
		}
		if ($game =~ /\[Result\s+"[^*]+"\]/) {
		    &prompt_for_move ("Game finished, press \"Return\" to continue: ", "") ;
                    next ;
		}

		$tmpgame = $game_nocomment ;
		$comment = $comment_orig ;

	      outer:
		while (1) {
		    if ($game =~ /{\n?.* offers a draw\n?}$/) {
			$move = &prompt_for_move ("Enter move [MOVE/(r)esign/(a)ccept/(c)omment/re(t)ry]: ",
						  "([-a-h0-9PRNBQK][-a-h0-9PRNBQK]+|[ract])") ;
		    } else {
			$move = &prompt_for_move ("Enter move [MOVE/(r)esign/(c)omment/re(t)ry]: ",
						  "([-a-h0-9PRNBQK][-a-h0-9PRNBQK]+|[rct])") ;
		    }
		    $normal_move = 0 ;
		    $result = "" ;
		    if ($move =~ /^\s*r\s*$/i) {
			if ($to_play eq "White") {
			    $result = "0-1" ;
			} else {
			    $result = "1-0" ;
			}
			$move = "\n{$to_play resigns} $result" ;
		    } elsif ($move =~ /^\s*a\s*$/i) {
			$move = "\n{Draw agreed} $result" ;
		    } elsif ($move =~ /^\s*c\s*$/i) {
                        while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
			    $comment .= $comment_line . "\n" ;
                        }
			next ;
		    } elsif ($move =~ /^\s*t\s*$/i) {
			print $game, "\n\n", $pos ;
			$tmpgame = $game_nocomment ;
			$comment = $comment_orig ;
			print "Try again.\n" ;
			next ;
		    } else {
			$normal_move = 1 ;
		    }

		    $tmpgame .= "\n{\n" . $comment . "}" if ($comment) ;
		    if (! $normal_move) {
			$tmpgame .= "$move"  ;
		    } elsif ($to_play eq "White") {
			$tmpgame .= "\n$number. $move"  ;
		    } elsif ($tmpgame =~ /}$/) {
			$tmpgame .= "\n$number. ... $move"  ;
		    } else {
			$tmpgame .= " $move"  ;
		    }

		    $tmpgame =~ s/\[Result\s+"(.*)"\]/[Result "$result"]/ if ($result) ;
		    $comment = "" ;
		  middle:
		    while (1) {
			if ($normal_move) {
			    $action = &prompt_for_move ("Enter action [(d)raw/(c)omment/(s)end/re(t)ry]: ",
							"[dcst]") ;
			} elsif ($result) {
			    $action = &prompt_for_move ("Enter action [(s)end/re(t)ry]: ",
							"[st]") ;
			} else {
			    $action = &prompt_for_move ("Enter action [(c)omment/(s)end/re(t)ry]: ",
							"[cst]") ;
			}
			if ($action =~ /^\s*d\s*$/i) {
			    if ($normal_move) {
				$comment .= "$to_play offers a draw\n" ;

				while (1) {
				    $action = &prompt_for_move ("Enter action [(c)omment/(s)end/re(t)ry]: ",
								"[cst]") ;
				    if ($action =~ /^\s*c\s*$/i) {
					while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
					    $comment .= $comment_line . "\n" ;
                        		}
				        next ;
				    } elsif ($action =~ /^\s*t\s*$/i) {
					print $game, "\n\n", $pos ;
					$tmpgame = $game_nocomment ;
					$comment = $comment_orig ;
					print "Try again.\n" ;
					next outer;
				    } elsif ($action =~ /^\s*s\s*$/i) {
					$tmpgame .= "\n{\n" . $comment . "}" ;
					last middle ;
				    }
				}
			    } else {
				print "You can't offer a draw at this point.\n" ;
				next ;
			    }
			} elsif ($action =~ /^\s*c\s*$/i) {
			    if ($result) {
				print "You can't enter a comment after the game is finished.\n" ;
			    } else {
				while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
				    $comment .= $comment_line . "\n" ;
                        	}
			    }
			    next ;
			} elsif ($action =~ /^\s*t\s*$/i) {
			    print $game, $pos ;
			    $tmpgame = $game_nocomment ;
			    $comment = $comment_orig ;
			    print "Try again.\n" ;
			    next outer;
			} elsif ($action =~ /^\s*s\s*$/i) {
			    $tmpgame .= "\n{\n" . $comment . "}\n" if ($comment) ;
			    last ;
			}
		    }

		    last ;
		}

		$tmpgame .= "\n*" if ($normal_move) ;
		$tmpgame .= "\n\n" ;
		$game = $tmpgame ;
	    }
	} else {
	    die "cmail: No games to be read\n" ;
	}
    } else {
	die "cmail: Can't open tty" ;
    }

    return (@games) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Find the game the user wants by any means possible
sub find_game {
    &debug ("Called <find_game>\n") ;

    ## ################################################################# ##
    ## Ask user for a game name if not already known
    ## ################################################################# ##

    &prompt_for_game_name () if ("" eq "$PGN_GAME") ;

    ## ################################################################# ##
    ## Find out opponent's details
    ## ################################################################# ##

    if ("" eq "$PGN_GAME") {
	## ############################################################# ##
	## Failed to find the game name so construct a default from players
	## ############################################################# ##
	
	&prompt_for_opp_name () if ("" eq "$OPP_NNAME") ; ## Ask user
	die "cmail: Can't proceed without your opponent's short name (-opp)\n"
	    if ("" eq "$OPP_NNAME") ;
	die "cmail: Can't proceed without your own short name (-me)\n"
	    if ("" eq "$MY_NNAME") ;
	if ($NUM_WGAMES > 0) {
	    $PGN_GAME = "$MY_NNAME-vs-$OPP_NNAME" ; ## Construct default
	} else {
	    $PGN_GAME = "$OPP_NNAME-vs-$MY_NNAME" ; ## Construct default
	}
    } elsif (("" eq "$OPP_ADDRESS") && ("" ne "$RETURN_ADDRESS")) {
	$OPP_ADDRESS = $RETURN_ADDRESS ; ## Use return address instead
	&debug (  "Using return address \"$OPP_ADDRESS\""
		. " for opponent address\n") ;
    }

    ## ################################################################# ##
    ## If no $PGN_GAME.game.in file, assume we're starting a new game
    ## ################################################################# ##

    &start_new_game () unless (-f "$PGN_GAME.game.in") ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get the date
sub get_date {
    local ($the_time) = time ;
    local ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
	localtime ($the_time) ;
    $mon ++ ;
    $year += 1900 ;
    if ($mon < 10) {
	$mon = "0$mon" ;
    }
    if ($mday < 10) {
        $mday = "0$mday" ;
    }
    "$year.$mon.$mday" ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Start a new game
sub start_new_game {
    print (  "Starting new game"
	   . " -- $NUM_WGAMES as white, $NUM_BGAMES as black.\n") ;
    local ($to_play) = "white" ;
    $move_num = 0 ;
    $STARTING_NEW_GAME = 1 ;

    local (@game) ;

    ## ################################################################# ##
    ## Ask user for opponent's email address if unknown
    ## ################################################################# ##

    &prompt_for_opp_address () if ("" eq "$OPP_ADDRESS") ;

    ## ################################################################# ##
    ## Give up if we haven't got anywhere to send a move to
    ## ################################################################# ##

    die "cmail: Can't proceed without your opponent's email address.\n"
	if ("" eq "$OPP_ADDRESS") ;

    ## ################################################################# ##
    ## Create an empty game file
    ## ################################################################# ##

    open (GAMEFILE, "> $PGN_GAME.game.in") ;
    for ($j = 1; $j <= $NUM_GAMES; $j ++) {
	$PW_GCOS      =  &get_pw_gcos () ;

	$PGN_MYCOL    =  $MY_FNAME ;
	$PGN_MYCOL    =  $PW_GCOS unless $PGN_MYCOL ;
	$PGN_MYCOL    =  $MY_NNAME unless $PGN_MYCOL ;
	$PGN_MYCOLNA  =  $MY_ADDRESS ;
	$PGN_MYCOLNA  =  "?" unless ($PGN_MYCOLNA) ;
				    
	$PGN_OPPCOL   =  $OPP_FNAME ;
	$PGN_OPPCOL   =  "?" unless ($PGN_OPPCOL) ;
	$PGN_OPPCOLNA =  $OPP_ADDRESS ;
	$PGN_OPPCOLNA =  "?" unless ($PGN_OPPCOLNA) ;
	
	if ($j > $NUM_WGAMES) {
	    $PGN_WHITE   = $PGN_OPPCOL ;
	    $PGN_BLACK   = $PGN_MYCOL ;
	    $PGN_WHITENA = $PGN_OPPCOLNA ;
	    $PGN_BLACKNA = $PGN_MYCOLNA ;
	} else {
	    $PGN_WHITE   = $PGN_MYCOL ;
	    $PGN_BLACK   = $PGN_OPPCOL ;
	    $PGN_WHITENA = $PGN_MYCOLNA ;
	    $PGN_BLACKNA = $PGN_OPPCOLNA ;
	}
	
    	## ######################################################### ##
	## If we only have one colour of game then allow command-line 
	## colour specs to override
	## ######################################################### ##
	
	if (! ($NUM_WGAMES && $NUM_BGAMES)) {
	    $PGN_WHITE   = $WHITE_FNAME if ($WHITE_FNAME) ;
	    $PGN_BLACK   = $BLACK_FNAME if ($BLACK_FNAME) ;
	    $PGN_WHITENA = $WHITENA     if ($WHITENA)     ;
	    $PGN_BLACKNA = $BLACKNA     if ($BLACKNA)     ;
	}
	
	$PGN_DATE = &get_date () ;
	$PGN_DATE = "?" unless ($PGN_DATE) ;

	if ($NUM_GAMES > 1) {
	    $SUFFIX = ".$j" ;
	} else {
	    $SUFFIX = "" ;
	}
	@game = ("[Event \"$PGN_EVENT\"]\n",
		 "[Site \"$PGN_SITE\"]\n",
		 "[Date \"$PGN_DATE\"]\n",
		 "[Round \"$PGN_ROUND\"]\n",
		 "[White \"$PGN_WHITE\"]\n",
		 "[Black \"$PGN_BLACK\"]\n",
		 "[Result \"*\"]\n",
		 "[WhiteNA \"$PGN_WHITENA\"]\n",
		 "[BlackNA \"$PGN_BLACKNA\"]\n",
		 "[Mode \"$PGN_MODE\"]\n",
		 "[CmailGameName \"$PGN_GAME$SUFFIX\"]\n\n*\n") ;
	if ($j > $NUM_WGAMES) {
	    open (GAMEOUTFILE, "> $PGN_GAME.game.out.$j") ;
	    print GAMEOUTFILE @game ;
	    close (GAMEOUTFILE) ;
	} else {
	    print GAMEFILE @game ;
	}
    }
    close (GAMEFILE) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get the password file gcos (full name) entry
sub get_pw_entry {
    local ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell) =
	getpwuid ($<);
    ($name, $gcos) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get password file gcos (full name) entry
sub get_pw_gcos {
    local ($PW_GCOS) ;
    if (! $PW_GCOS) {
	($dummy, $PW_GCOS) = &get_pw_entry () ;
	$PW_GCOS =~ s/^\s*([^,()]+[^ ,()])[ ]*[,()].*$/$1/;
	if ($PW_GCOS =~ /^([^,()]+)\s+([^\s,()]+)$/) { ## Multi-word name
	    $PW_GCOS = $2 . ", " . $1 ;
	} elsif ($PW_GCOS !~ /^([^\s,()]+)/) { ## No sensible gcos entry 
	    $PW_GCOS = "" ;
	}			## Else leave it as one word
	&debug ("PW full name is \"$PW_GCOS\"\n");
    }
    return $PW_GCOS ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get password file user name entry
sub get_pw_name {
    local ($PW_NAME) ;
    ($PW_NAME, $dummy) = &get_pw_entry () ;
    &debug ("PW name is $PW_NAME\n");

    return $PW_NAME ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Analyse the email message
sub analyse_email_message {
    local ($new_result, $delete_result, $unfinished, $finished)
	= (0, 0, 0, 0) ;
    local ($gamefile, @games) ;

    ## ################################################################# ##
    ## Slurp the mail message
    ## ################################################################# ##

    die "cmail: No games on standard input" 
	unless (@games = &get_games_from_file ("STDIN")) ;

    ## ################################################################# ##
    ## Is the message a real cmail message or just a chess game? $PGN_GAME
    ## will have been set by calling get_games_from_file if it's real
    ## ################################################################# ##

    print "Processing game message..." ;

    if ($PGN_GAME) {
	## ############################################################# ##
	## Restore the results file from the archive if
	## necessary. This is helpful if the user pipes in an old
	## message for take-back purposes or whatever.
	## ############################################################# ##

	if (! -f "$PGN_GAME.res") {
	    ## Find what date would have been used to create the archive
	    foreach (@games) {
		if (/\[Date\s"(.*)"\]/) {
		    $date = $1 ;
		    last ;	## Assume all dates are the same
		}
	    }
	    ## Restore results file from archive directory if it exists
	    if ($date && (-f "$ARCDIR/$PGN_GAME.$date.archive")) {
		if (system ("cp",
			    "$ARCDIR/$PGN_GAME.$date.archive",
			    "$PGN_GAME.res")) {
		    print stderr (  "\nWarning: couldn't restore results file"
				  . " from archive\n") ;
		} else {
		    print "restored results file from archive..." ;
		}
	    }
	}

	## ############################################################# ##
	## Find existing results, if any.
	## ############################################################# ##

	local (@results) = &get_games_from_file ("$PGN_GAME.res") ;

	## ############################################################# ##
	## Parse each game
	## ############################################################# ##

	foreach $game (@games) {
	    next unless ($game) ;

	    ($game_name, $game_num) = &get_game_name_and_number ($game) ;

	    $result = 0 ;
	    @game = split("\n", $game) ;
	    foreach (@game) {
		if (/^\[(Black|White)\s*"[?]"\]$/) {
		    $colour = $1;
		    $PW_GCOS = &get_pw_gcos () unless ($PW_GCOS) ;
		    $PW_GCOS = "$MY_NNAME" unless ($PW_GCOS) ;
		    s/".*"/"$PW_GCOS"/ ;
		    &debug ("Changed $colour tag to be $_") ;
		} elsif (/^\[((Black|White)NA)\s*"(.*)"\]$/) {
		    $NA = $3 ;
		    if ($NA eq "?") {
			if ($RETURN_ADDRESS) {
			    $NA = $RETURN_ADDRESS ;
			} else {
			    $NA = "??" ;
			}
			$_ = "[$1 \"$NA\"]" ;
			&debug ("Changed $1 tag.\n") ;
		    }
		    if ($2 eq "White") {
			$PGN_WHITENA = $NA ;
			&debug ("WhiteNA tag is \"$PGN_WHITENA\"\n") ;
		    } else {
			$PGN_BLACKNA = $NA ;
			&debug ("BlackNA tag is \"$PGN_BLACKNA\"\n") ;
		    }
		} elsif (/\[Result\s*"(.*)"\]$/) {
		    if ($1 ne "*") {
			$result = 1 ;
			$finished ++ ;
		    } else {
			$unfinished ++ ;
		    }
		} elsif (/^(.*[^\d]+)?\d+[.]\s*([^\s*]*\s+)?[^\s.*]+(\s*\d+[.]\s*)?[\s*]*$/) {
		    if ($2) {
			$to_play = "white" ;
		    } else {
			$to_play = "black" ;
		    }
		    &debug ("$to_play to play\n") ;
		}
	    }

	    ## ######################################################### ##
	    ## Reconstruct possibly edited game
	    ## ######################################################### ##

	    $game = join ("\n", @game) . "\n\n" ;

	    ## ######################################################### ##
	    ## Build up results array
	    ## ######################################################### ##

	    if ($result) {
		$results[$game_num] = $games[$game_num] ;
		$new_result = 1 ;
	    } elsif ($results[$game_num]) {
		## Deleting a result does actually make sense if the user
		## pipes in an old message for take-back purposes or whatever
		$results[$game_num] = "" ;
		$delete_result = 1 ;
	    }

	    ## ######################################################### ##
	    ## Remove old .out files
	    ## ######################################################### ##

	    unlink <$PGN_GAME.game.out.*> ;

	    ## ######################################################### ##
	    ## Write ongoing games to game file and append new results
	    ## ######################################################### ##

	    die   "cmail: Can't open file for writing:"
		. " \"$CMAILDIR/$PGN_GAME.game.in\"\n"
		unless open (gamefile, ">$PGN_GAME.game.in") ;
	    &debug (@games) ;
	    print gamefile @games ;
	    close (gamefile) ;
	}

	## ############################################################# ##
	## Print how many finished/unfinished games were found
	## ############################################################# ##

	printf ("%d unfinished %s and %d finished %s...",
		$unfinished, ($unfinished == 1) ? "game" : "games",
		$finished, ($finished == 1) ? "game" : "games") ;

	## ############################################################# ##
	## Write results back to results file if there were any results
	## in the input
	## ############################################################# ##
	
	if ($new_result || $delete_result) {
	    die (  "cmail: Can't open results file for writing:"
		 . "\"$CMAILDIR/$PGN_GAME.res\"\n")
		unless open (resfile, ">$PGN_GAME.res") ;
	    print resfile @results ;
	    close (resfile) ;
	}

	## ############################################################# ##
	## Archive results if there are no unfinished games
	## ############################################################# ##
	
	@ARCHIVE = @results unless ($unfinished) ;

	## ############################################################# ##
	## Figure out return address if not known
	## ############################################################# ##

	if (! $RETURN_ADDRESS) {
	    if ($to_play eq "black") {
		$RETURN_ADDRESS = $PGN_WHITENA unless ("$PGN_WHITENA" eq "?") ;
	    } else {
		$RETURN_ADDRESS = $PGN_BLACKNA unless ("$PGN_BLACKNA" eq "?") ;
	    }
	}

	## ############################################################# ##
	## Decide to include position diagrams in output if not already
	## decided and a position diagram was found in the input
	## ############################################################# ##

	if ("$OUTPUT_POS" eq "") {
	    if (grep (/$posdiag/, @games)) {
		$OUTPUT_POS = "y" ; # Output position only if it was input
	    } else {
		$OUTPUT_POS = "n" ;
	    }
	}
	$ENV{'CMAIL_OUTPUT_POS'} = $OUTPUT_POS ;

	## ############################################################# ##
	## Check that we have enough info about the players to continue
	## ############################################################# ##

	&find_game () ;
    } else {
	## ############################################################# ##
	## Set up xboard for viewing non-cmail PGN file
	## ############################################################# ##

	local ($file) = "unknown.cmail" ;
	print "done.\nDumping non-cmail file into $CMAILDIR/$file..." ;

	die "cmail: Can't open file for writing: \"$CMAILDIR/$file\"\n"
	    unless open (gamefile, ">$file") ;
	print gamefile @games ;
	close (gamefile) ;
    }

    print "done.\n" ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Sort two filenames by the numeric suffix
sub sort_by_numeric_suffix {
    $a =~ /[.](\d+)$/ ; local ($na) = $1 ;
    $b =~ /[.](\d+)$/ ; local ($nb) = $1 ;

    return ($na <=> $nb) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
sub get_game_name_and_number {
    local ($game) = join ("\n", @_) ;

    local ($game_name, $game_num) ;

    die "CMailGameName tag missing\n"
	unless ($game =~ /\[C[Mm]ailGameName\s+"(.*)"\]/) ;

    ## ################################################################# ##
    ## Set game name and number
    ## ################################################################# ##

    $game_name = $1 ;
    if ($game_name =~ s/^(.*)[.](\d+)$/$1/) {
	$game_num = $2 ;
    } else {
	$game_num = 1 ;
    }

    ## ################################################################# ##
    ## Set $PGN_GAME as a side-effect or check validity
    ## ################################################################# ##

    if ($PGN_GAME) {
	die (  "cmail: Mismatched game names in input message:\n"
	     . "\"$PGN_GAME\", \"$game_name\"\n")
	    if ("$PGN_GAME" ne "$game_name") ;
    } else {
	$PGN_GAME = $game_name ;
	&debug ("PGN_GAME set to \"$PGN_GAME\"\n") ;
    }

    return ($game_name, $game_num) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Read in a file of games and split into separate games
sub get_games_from_file {
    local ($file) = shift ;

    local (@file, $first_line) ; ## Slurp stdin
    if ($file eq "STDIN") {
	if ($first_line = <STDIN>) { ## Necessary to handle no input case
	    @file = <STDIN> ; ## Slurp stdin
	    @file = ($first_line, @file) ;

	    foreach (@file) {
		## Strip off leading quotation characters
		s/^[^\s]*>// ;
		s/^[ \t]+// ;
		
		## Find return address and set it as a side-effect
		if (   /^From:?.*<([^>]+)>.*\n$/
		    || /^From:? *([^ ]*).*\n$/) {
		    $RETURN_ADDRESS = $1 ; ## Default for opp's email
		    &debug ("Found opponent's email address",
			    " \"$RETURN_ADDRESS\"\n") ;
		} elsif (/\[C[Mm]ailGameName\s+"(.*)"\]/) {
		    $PGN_GAME =  $1 ;
		    $PGN_GAME =~ s/[.]\d+$// ;
		}
	    }

	    return (@file) unless ($PGN_GAME) ;
	    if (grep (/\{--------------|\[Event/, @file)) {
		shift (@file) while ($file[0] !~ /\{--------------|\[Event/) ;
	    }
	} else {
	    return () ;
	}
    } else {
	return () unless (open (file, "<$file")) ;
    
	@file = <file> ; ## Slurp file
	close (file) ;
    }
    
    local (@games, $game_name, $game_num, $game, $tag) ;

    ## ################################################################# ##
    ## Remove headers and leading blanks
    ## ################################################################# ##

    local (@tgames) = split (/($posdiag\[Event|\[Event)/, join ('', @file)) ;
    shift (@tgames) while (!$tgames[0]) ;

    ## ################################################################# ##
    ## Set up @games array with proper game numbers
    ## ################################################################# ##

    while (@tgames) {
	$game = shift (@tgames) . shift (@tgames) ;

	($game_name, $game_num) = &get_game_name_and_number ($game) ;
	$games[$game_num] = $game ;
    }

    return (@games) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Analyse output files and send the move
sub send_move {
    &debug ("Called <send_move>\n") ;

    ## ################################################################# ##
    ## Cat the pos (if it exists), game and result (if it exists) files
    ## into the .out file.
    ## ################################################################# ##
    
    local ($unfinished, $finished) = (0, 0) ;
    local (@results, $move, $move_msg, $to_play, $number) ;
   
    ## ################################################################# ##
    ## Find any .game.out.* files
    ## ################################################################# ##

    local (@outfiles) = (<$PGN_GAME.game.out.*>) ;
    @outfiles = grep (/[.]\d+$/, @outfiles) ; ## Ignore autosave files
    @outfiles = sort sort_by_numeric_suffix @outfiles ; ## Sort

    ## ################################################################# ##
    ## Find .res file if it exists
    ## ################################################################# ##

    local ($resfile) = "$PGN_GAME.res" ;
    if (-f $resfile) {
	@results = &get_games_from_file($resfile) ;
	&debug ("Read in results\n") ;
    } else {
	@results = () ;
	&debug ("No results to read\n") ;
    }

    ## ################################################################# ##
    ## Find .out file if it exists
    ## ################################################################# ##

    local ($outfile) = "$PGN_GAME.out" ;
    if (! ($REMAIL || $LOAD_XBOARD)) {
	@games = &play_on_tty (@results) ;
    } elsif (@outfiles) {
	foreach (@outfiles) {
	    die "Can't open game file \"$_\" for reading"
		unless (open (game, "<$_")) ;
	    die "Empty game file \"$_\""
		unless ($game = join ('', <game>)) ;
	    close (game) ;
	    &debug ("Read in game file \"$_\"\n") ;
	    ## Remove position diagram if it wasn't in the input msg
	    $game =~ s/($posdiag)// if ("$OUTPUT_POS" ne "y") ;
	    ($game_name, $game_num) = &get_game_name_and_number ($game) ;
	    $games[$game_num] = $game ;
	}
	&debug ("Read in games from output files\n") ;
	$games[0] = "" ;
    } else {
	&debug ("No games to read from STDIN\n") ;
	if (-f $outfile) {
	    @games = &get_games_from_file($outfile) ;
	} else {
	    die "Can't find any game files\n" unless (@results) ;
	}
    }

    ## ################################################################# ##
    ## Process games
    ## ################################################################# ##

    if (@games) {
	## ############################################################# ##
	## Find opponent's email address in games
	## ############################################################# ##
	
	$OPP_ADDRESS = &get_opp_address_from_games (@games)
	    unless ($OPP_ADDRESS) ;

	## ############################################################# ##
	## Collect the .game.out.* files into the .out file, remembering
	## the move number of the last line and whether result or not
	## ############################################################# ##

	$unfinished = 0 ;
	$move_num = 0 ;
	$move = blank ;

	## Write games to output file
	die "Can't open output file \"$PGN_GAME.out\" for writing\n"
	    unless open (outfile, ">$PGN_GAME.out") ;
	print outfile @games ;
	close (outfile) ;
		
	$game_num = -1 ;
	$num_games = 0 ;
	foreach $game (@games) {
	    $game_num ++ ;
	    next unless ($game) ;

	    $num_games ++ ;
	    ## Determine last move and whether result or not
	    $result = 0 ;
	    foreach (split(/\n/, $game)) {
		if (/^(.*[^\d]+|)(\d+)[.]+\s*[^\s.]*\s+(\S+)\s*$/) {
		    $move_num = $2 ;
		    $move    = $3 ;
		} elsif (/^\[Result\s*"(.*)"\]$/) {
		    if ($1 ne "*") {
			$result = 1 ;
			$finished ++ ;
		    } else {
			$unfinished ++ ;
		    }
		}
	    }
	    
	    $results[$game_num] = $game if ($result) ;
	}

	## Write result files back to $PGN_GAME.res
	if (@results) {
	    die "Can't open results file $PGN_GAME.res for writing\n"
		unless open (resfile, ">$PGN_GAME.res") ;
	    print resfile @results ;
	    close (results) ;
	}

	unlink <$PGN_GAME.game.out.*> ;

	## ############################################################# ##
	## Just say how many games are in the message
	## ############################################################# ##
	    
	if ($num_games > 1) {
	    $move_msg = "$num_games games" ;
	} else {
	    $move_msg = "1 game" ;
	}

	## ############################################################# ##
	## Print how many finished/unfinished games were found
	## ############################################################# ##

	printf ("Sending %d unfinished %s and %d finished %s.\n",
		$unfinished, ($unfinished == 1) ? "game" : "games",
		$finished, ($finished == 1) ? "game" : "games") ;

	## ############################################################# ##
	## Send the mail message to opponent's address unless bypassed
	## ############################################################# ##

	if ($SEND_MAIL) {
	    local ($subject) = "cmail $move_msg <$PGN_GAME>" ;
	    if ($MAILPROG =~ /sendmail/) {
		$opened = open (mail, "|$MAILPROG $OPP_ADDRESS") ;
 		print mail "To: $OPP_ADDRESS\n";
 		print mail "Subject: $subject\n";
 		print mail "Mime-Version: 1.0\n";
 		print mail "Content-Type: application/x-chess;name=$PGN_GAME.pgn\n\n";
	    } else {
		$opened = open (mail, "|$MAILPROG -s \"$subject\" $OPP_ADDRESS") ;
	    }
  	    if ($opened) {
		print mail @games ;
		close (mail) ;
		print (  "Mailed cmail message to \"$OPP_ADDRESS\":\n"
		       . "$move_msg <$PGN_GAME>\n") ;
		@ARCHIVE = @results unless ($unfinished) ;
	    } else {
		die "Failed to mail cmail message.\n" ;
	    }
	} else {
	    print (  "Email not sent (as requested).\n"
		   . "Would have mailed cmail message to \"$OPP_ADDRESS\":\n"
		   . "$NUM_GAMES games <$PGN_GAME>\n") ;
	}
    } else {
	if (@results) {
	    print "Email not sent (the game is over).\n" ;
	} else {
	    die "No games found\n" ;
	}
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get date from array of games
sub get_date_from_games {
    local (@games) = @_ ;

    local ($date) = "nodate" ;

    foreach (@games) {
	if (/\[Date\s"(.*)"\]/) {
	    $date = $1 ;
	    last ;		## Assume all dates are the same
	}
    }

    return ($date) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Determine which colour is to play and the move number
sub get_to_play {
    &debug ("Called <get_to_play>\n") ;
    local ($game) = shift ;

    local ($number, $to_play) = (1, "White") ;

    $game =~ s/{[^}]*}//g ;
    $game =~ s/[\s\n]*[*][\s\n]*$// ;

    if ($game =~ /(\d+)[.][\n ]*([.]*)[\n ]*([^\n.]*)[\n\s]*[10-]*[\n\s]*$/) {
	$number = $1 ;

	if ($game =~ /\[Result "0-1"\]/) {
	    $to_play = "Black" ;
	} elsif ($game =~ /\[Result "1-0"\]/) {
	    $to_play = "White" ;
	} elsif (($2 ne "") || (($3 =~ / /) || ($3 eq ""))) {
	    $to_play = "White" ;
	    $number ++ ;
	} else {
	    $to_play = "Black" ;
	}
    }

    &debug ("$to_play to play on move $number\n") ;

    return ($number, $to_play) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get opp address from array of games
sub get_opp_address_from_games {
    &debug ("Called <get_opp_address_from_games>\n") ;
    local (@games) = @_ ;

    local ($opp_address) = "" ;
    local ($number, $to_play, $tag) ;

    foreach (@games) {
	next unless $_ ;
	
	($number, $to_play) = &get_to_play ($_) ;
	$tag = (  ($to_play eq "White")
		? "WhiteNA"
		: "BlackNA") ;

	if (/\[$tag\s"(.*)"\]/) {
	    $opp_address = $1 ;
	    die "cmail: Empty \"$tag\" tag\n" unless ($opp_address) ;
	    &debug ("Found opponent's address \"$opp_address\" from games.\n") ;
	    last ;		## Assume all opp addresses are the same
	} else {
	    die "cmail: Can't find \"$tag\" tag\n" ;
	}
    }

    die "cmail: Can't find opponent's email address\n" unless ($opp_address) ;

    return ($opp_address) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Archive @ARCHIVE in the $ARCDIR directory
sub archive {
    return () unless (@ARCHIVE) ;

    local ($date) = &get_date_from_games (@ARCHIVE) ;

    local ($file) = "$ARCDIR/$PGN_GAME.$date.archive" ;
    if (open (archive, ">$file")) {
	print archive @ARCHIVE ;
	close (archive) ;
	print "Archived game in $file\n" ;
	local (@remove) = <$PGN_GAME*> ;
	@remove = grep ($_ ne "$PGN_GAME.$date.archive",
			@remove) ; ## Don't delete archive
	unlink (@remove) ;
    } else {
	print "Couldn't open \"$file\" to archive game\n" ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Main body
sub main {
    local (@games) = () ;

    &initialise () ;		## Initialise variables etc.

    if (-t || $REMAIL) { ## No input directed (invoked from a shell rather than a mailer)
	&debug ("Interactive!\n") ;
	&find_game () ;		## Get the necessary info about the game
    } else {
	&debug ("Piping!\n") ;
	&analyse_email_message () ; ## Analyse the mail message
    }
    
    if (! &play_game ()) {	## Load the game
	&send_move () ;		## Analyse output and send moves
    }

    &archive () ;		## Archive games if all finished

    close (tty) ;		## Tidy up
    close (logfile) if ($DEBUG) ; ## Tidy up
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
&main () ;
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
__END__
cmail (From XBoard version 4.5.3), Copyright (C) 1993 Free Software Foundation, Inc.
cmail comes with ABSOLUTELY NO WARRANTY; for details type `cmail -w'.
cmail is free software, and you are welcome to redistribute it
under certain conditions; type `cmail -c' for details.

{END OF GPL COPYRIGHT}
		    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language.  (Hereinafter, translation is included without limitation in
the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.

  1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.

You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.

  2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.

    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.

    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)

These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works.  But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.

Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.

In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.

  3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,

    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)

The source code for a work means the preferred form of the work for
making modifications to it.  For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable.  However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.

If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.

  4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

  5. You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.

  8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
{END OF GPL CONDITIONS}
		    GNU GENERAL PUBLIC LICENSE
			    NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.