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life.c revision 1.2 
      1 .\" Copyright (c) 1980, 1993
      2 .\"	 The Regents of the University of California.  All rights reserved.
      3 .\"
      4 .\" Redistribution and use in source and binary forms, with or without
      5 .\" modification, are permitted provided that the following conditions
      6 .\" are met:
      7 .\" 1. Redistributions of source code must retain the above copyright
      8 .\"    notice, this list of conditions and the following disclaimer.
      9 .\" 2. Redistributions in binary form must reproduce the above copyright
     10 .\"    notice, this list of conditions and the following disclaimer in the
     11 .\"    documentation and/or other materials provided with the distribution.
     12 .\" 3. All advertising materials mentioning features or use of this software
     13 .\"    must display the following acknowledgement:
     14 .\"	This product includes software developed by the University of
     15 .\"	California, Berkeley and its contributors.
     16 .\" 4. Neither the name of the University nor the names of its contributors
     17 .\"    may be used to endorse or promote products derived from this software
     18 .\"    without specific prior written permission.
     19 .\"
     20 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30 .\" SUCH DAMAGE.
     31 .\"
     32 .\"	from: @(#)life.c	8.1 (Berkeley) 6/8/93
     33 .\"	$Id: life.c,v 1.2 1993/11/09 04:09:50 cgd Exp $
     34 .\"
     35 # include	<curses.h>
     36 # include	<signal.h>
     37 
     38 /*
     39  *	Run a life game.  This is a demonstration program for
     40  * the Screen Updating section of the -lcurses cursor package.
     41  */
     42 
     43 typedef struct lst_st {			/* linked list element */
     44 	int		y, x;		/* (y, x) position of piece */
     45 	struct lst_st	*next, *last;	/* doubly linked */
     46 } LIST;
     47 
     48 LIST	*Head;			/* head of linked list */
     49 
     50 int	die();
     51 
     52 main(ac, av)
     53 int	ac;
     54 char	*av[];
     55 {
     56 	evalargs(ac, av);		/* evaluate arguments */
     57 
     58 	initscr();			/* initialize screen package */
     59 	signal(SIGINT, die);		/* set to restore tty stats */
     60 	cbreak();			/* set for char-by-char */
     61 	noecho();			/*	input */
     62 	nonl();				/* for optimization */
     63 
     64 	getstart();			/* get starting position */
     65 	for (;;) {
     66 		prboard();		/* print out current board */
     67 		update();		/* update board position */
     68 	}
     69 }
     70 
     71 /*
     72  * This is the routine which is called when rubout is hit.
     73  * It resets the tty stats to their original values.  This
     74  * is the normal way of leaving the program.
     75  */
     76 die()
     77 {
     78 	signal(SIGINT, SIG_IGN);		/* ignore rubouts */
     79 	mvcur(0, COLS - 1, LINES - 1, 0);	/* go to bottom of screen */
     80 	endwin();				/* set terminal to good state */
     81 	exit(0);
     82 }
     83 
     84 /*
     85  * Get the starting position from the user.  They keys u, i, o, j, l,
     86  * m, ,, and . are used for moving their relative directions from the
     87  * k key.  Thus, u move diagonally up to the left, , moves directly down,
     88  * etc.  x places a piece at the current position, " " takes it away.
     89  * The input can also be from a file.  The list is built after the
     90  * board setup is ready.
     91  */
     92 getstart()
     93 {
     94 	reg char	c;
     95 	reg int		x, y;
     96 	auto char	buf[100];
     97 
     98 	box(stdscr, '|', '_');		/* box in the screen */
     99 	move(1, 1);			/* move to upper left corner */
    100 
    101 	for (;;) {
    102 		refresh();		/* print current position */
    103 		if ((c = getch()) == 'q')
    104 			break;
    105 		switch (c) {
    106 		  case 'u':
    107 		  case 'i':
    108 		  case 'o':
    109 		  case 'j':
    110 		  case 'l':
    111 		  case 'm':
    112 		  case ',':
    113 		  case '.':
    114 			adjustyx(c);
    115 			break;
    116 		  case 'f':
    117 			mvaddstr(0, 0, "File name: ");
    118 			getstr(buf);
    119 			readfile(buf);
    120 			break;
    121 		  case 'x':
    122 			addch('X');
    123 			break;
    124 		  case ' ':
    125 			addch(' ');
    126 			break;
    127 		}
    128 	}
    129 
    130 	if (Head != NULL)			/* start new list */
    131 		dellist(Head);
    132 	Head = malloc(sizeof (LIST));
    133 
    134 	/*
    135 	 * loop through the screen looking for 'x's, and add a list
    136 	 * element for each one
    137 	 */
    138 	for (y = 1; y < LINES - 1; y++)
    139 		for (x = 1; x < COLS - 1; x++) {
    140 			move(y, x);
    141 			if (inch() == 'x')
    142 				addlist(y, x);
    143 		}
    144 }
    145 
    146 /*
    147  * Print out the current board position from the linked list
    148  */
    149 prboard() {
    150 
    151 	reg LIST	*hp;
    152 
    153 	erase();			/* clear out last position */
    154 	box(stdscr, '|', '_');		/* box in the screen */
    155 
    156 	/*
    157 	 * go through the list adding each piece to the newly
    158 	 * blank board
    159 	 */
    160 	for (hp = Head; hp; hp = hp->next)
    161 		mvaddch(hp->y, hp->x, 'X');
    162 
    163 	refresh();
    164 }
    165