lib/libcurses/PSD.doc/life.c

   1 .\"     $NetBSD: life.c,v 1.6 2003/08/07 16:44:28 agc Exp $
   2 .\"
   3 .\" Copyright (c) 1980, 1993
   4 .\"      The Regents of the University of California.  All rights reserved.
   5 .\"
   6 .\" Redistribution and use in source and binary forms, with or without
   7 .\" modification, are permitted provided that the following conditions
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   9 .\" 1. Redistributions of source code must retain the above copyright
  10 .\"    notice, this list of conditions and the following disclaimer.
  11 .\" 2. Redistributions in binary form must reproduce the above copyright
  12 .\"    notice, this list of conditions and the following disclaimer in the
  13 .\"    documentation and/or other materials provided with the distribution.
  14 .\" 3. Neither the name of the University nor the names of its contributors
  15 .\"    may be used to endorse or promote products derived from this software
  16 .\"    without specific prior written permission.
  17 .\"
  18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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  29 .\"
  30 .\"     @(#)life.c      8.1 (Berkeley) 6/8/93
  31 .\"
  32 # include       <curses.h>
  33 # include       <signal.h>
  34
  35 /*
  36  *      Run a life game.  This is a demonstration program for
  37  * the Screen Updating section of the -lcurses cursor package.
  38  */
  39
  40 typedef struct lst_st {                 /* linked list element */
  41         int             y, x;           /* (y, x) position of piece */
  42         struct lst_st   *next, *last;   /* doubly linked */
  43 } LIST;
  44
  45 LIST    *Head;                  /* head of linked list */
  46
  47 int     die();
  48
  49 main(ac, av)
  50 int     ac;
  51 char    *av[];
  52 {
  53         evalargs(ac, av);               /* evaluate arguments */
  54
  55         initscr();                      /* initialize screen package */
  56         signal(SIGINT, die);            /* set to restore tty stats */
  57         cbreak();                       /* set for char-by-char */
  58         noecho();                       /*      input */
  59         nonl();                         /* for optimization */
  60
  61         getstart();                     /* get starting position */
  62         for (;;) {
  63                 prboard();              /* print out current board */
  64                 update();               /* update board position */
  65         }
  66 }
  67
  68 /*
  69  * This is the routine which is called when rubout is hit.
  70  * It resets the tty stats to their original values.  This
  71  * is the normal way of leaving the program.
  72  */
  73 die()
  74 {
  75         signal(SIGINT, SIG_IGN);                /* ignore rubouts */
  76         mvcur(0, COLS - 1, LINES - 1, 0);       /* go to bottom of screen */
  77         endwin();                               /* set terminal to good state */
  78         exit(0);
  79 }
  80
  81 /*
  82  * Get the starting position from the user.  They keys u, i, o, j, l,
  83  * m, ,, and . are used for moving their relative directions from the
  84  * k key.  Thus, u move diagonally up to the left, , moves directly down,
  85  * etc.  x places a piece at the current position, " " takes it away.
  86  * The input can also be from a file.  The list is built after the
  87  * board setup is ready.
  88  */
  89 getstart()
  90 {
  91         reg char        c;
  92         reg int         x, y;
  93         auto char       buf[100];
  94
  95         box(stdscr, '|', '_');          /* box in the screen */
  96         move(1, 1);                     /* move to upper left corner */
  97
  98         for (;;) {
  99                 refresh();              /* print current position */
 100                 if ((c = getch()) == 'q')
 101                         break;
 102                 switch (c) {
 103                   case 'u':
 104                   case 'i':
 105                   case 'o':
 106                   case 'j':
 107                   case 'l':
 108                   case 'm':
 109                   case ',':
 110                   case '.':
 111                         adjustyx(c);
 112                         break;
 113                   case 'f':
 114                         mvaddstr(0, 0, "File name: ");
 115                         getstr(buf);
 116                         readfile(buf);
 117                         break;
 118                   case 'x':
 119                         addch('X');
 120                         break;
 121                   case ' ':
 122                         addch(' ');
 123                         break;
 124                 }
 125         }
 126
 127         if (Head != NULL)                       /* start new list */
 128                 dellist(Head);
 129         Head = malloc(sizeof (LIST));
 130
 131         /*
 132          * loop through the screen looking for 'x's, and add a list
 133          * element for each one
 134          */
 135         for (y = 1; y < LINES - 1; y++)
 136                 for (x = 1; x < COLS - 1; x++) {
 137                         move(y, x);
 138                         if (inch() == 'x')
 139                                 addlist(y, x);
 140                 }
 141 }
 142
 143 /*
 144  * Print out the current board position from the linked list
 145  */
 146 prboard() {
 147
 148         reg LIST        *hp;
 149
 150         erase();                        /* clear out last position */
 151         box(stdscr, '|', '_');          /* box in the screen */
 152
 153         /*
 154          * go through the list adding each piece to the newly
 155          * blank board
 156          */
 157         for (hp = Head; hp; hp = hp->next)
 158                 mvaddch(hp->y, hp->x, 'X');
 159
 160         refresh();
 161 }