1 /*
2  * Copyright (c) 1980 Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  *
7  *	@(#)back.h	5.4 (Berkeley) 06/01/90
8  */
9 
10 #include <sgtty.h>
11 
12 #define rnum(r)	(random()%r)
13 #define D0	dice[0]
14 #define D1	dice[1]
15 #define swap	{D0 ^= D1; D1 ^= D0; D0 ^= D1; d0 = 1-d0;}
16 
17 /*
18  *
19  * Some numerical conventions:
20  *
21  *	Arrays have white's value in [0], red in [1].
22  *	Numeric values which are one color or the other use
23  *	-1 for white, 1 for red.
24  *	Hence, white will be negative values, red positive one.
25  *	This makes a lot of sense since white is going in decending
26  *	order around the board, and red is ascending.
27  *
28  */
29 
30 char	EXEC[];			/* object for main program */
31 char	TEACH[];		/* object for tutorial program */
32 
33 int	pnum;			/* color of player:
34 					-1 = white
35 					 1 = red
36 					 0 = both
37 					 2 = not yet init'ed */
38 char	args[100];		/* args passed to teachgammon and back */
39 int	acnt;			/* length of args */
40 int	aflag;			/* flag to ask for rules or instructions */
41 int	bflag;			/* flag for automatic board printing */
42 int	cflag;			/* case conversion flag */
43 int	hflag;			/* flag for cleaning screen */
44 int	mflag;			/* backgammon flag */
45 int	raflag;			/* 'roll again' flag for recovered game */
46 int	rflag;			/* recovered game flag */
47 int	tflag;			/* cursor addressing flag */
48 int	rfl;			/* saved value of rflag */
49 int	iroll;			/* special flag for inputting rolls */
50 int	board[26];		/* board:  negative values are white,
51 				   positive are red */
52 int	dice[2];		/* value of dice */
53 int	mvlim;			/* 'move limit':  max. number of moves */
54 int	mvl;			/* working copy of mvlim */
55 int	p[5];			/* starting position of moves */
56 int	g[5];			/* ending position of moves (goals) */
57 int	h[4];			/* flag for each move if a man was hit */
58 int	cturn;			/* whose turn it currently is:
59 					-1 = white
60 					 1 = red
61 					 0 = just quitted
62 					-2 = white just lost
63 					 2 = red just lost */
64 int	d0;			/* flag if dice have been reversed from
65 				   original position */
66 int	table[6][6];		/* odds table for possible rolls */
67 int	rscore;			/* red's score */
68 int	wscore;			/* white's score */
69 int	gvalue;			/* value of game (64 max.) */
70 int	dlast;			/* who doubled last (0 = neither) */
71 int	bar;			/* position of bar for current player */
72 int	home;			/* position of home for current player */
73 int	off[2];			/* number of men off board */
74 int	*offptr;		/* pointer to off for current player */
75 int	*offopp;		/* pointer to off for opponent */
76 int	in[2];			/* number of men in inner table */
77 int	*inptr;			/* pointer to in for current player */
78 int	*inopp;			/* pointer to in for opponent */
79 
80 int	ncin;			/* number of characters in cin */
81 char	cin[100];		/* input line of current move
82 				   (used for reconstructing input after
83 				   a backspace) */
84 
85 char	*color[];
86 				/* colors as strings */
87 char	**colorptr;		/* color of current player */
88 char	**Colorptr;		/* color of current player, capitalized */
89 int	colen;			/* length of color of current player */
90 
91 struct sgttyb	tty;		/* tty information buffer */
92 int		old;		/* original tty status */
93 int		noech;		/* original tty status without echo */
94 int		raw;		/* raw tty status, no echo */
95 
96 int	curr;			/* row position of cursor */
97 int	curc;			/* column position of cursor */
98 int	begscr;			/* 'beginning' of screen
99 				   (not including board) */
100 
101 int	getout();		/* function to exit backgammon cleanly */
102