games/worm/worm.c

   1 /*-
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)worm.c   8.1 (Berkeley) 5/31/93
  31  * $FreeBSD: src/games/worm/worm.c,v 1.9 1999/12/07 02:01:27 billf Exp $
  32  * $DragonFly: src/games/worm/worm.c,v 1.5 2006/09/07 21:28:27 pavalos Exp $
  33  */
  34
  35 /*
  36  * Worm.  Written by Michael Toy
  37  * UCSC
  38  */
  39
  40 #include <ctype.h>
  41 #include <curses.h>
  42 #include <signal.h>
  43 #include <stdlib.h>
  44 #include <termios.h>
  45 #include <unistd.h>
  46
  47 #define newlink() malloc(sizeof(struct body));
  48 #define HEAD '@'
  49 #define BODY 'o'
  50 #define LENGTH 7
  51 #define RUNLEN 8
  52 #define CNTRL(p) (p-'A'+1)
  53
  54 WINDOW *tv;
  55 WINDOW *stw;
  56 struct body {
  57         int x;
  58         int y;
  59         struct body *prev;
  60         struct body *next;
  61 } *head, *tail, goody;
  62 int growing = 0;
  63 int running = 0;
  64 int slow = 0;
  65 int score = 0;
  66 int start_len = LENGTH;
  67 char lastch;
  68 char outbuf[BUFSIZ];
  69
  70 void crash(void);
  71 void display(struct body *, char);
  72 void leave(int);
  73 void life(void);
  74 void newpos(struct body *);
  75 void prize(void);
  76 void process(char);
  77 long rnd(int);
  78 void setup(void);
  79 void suspend(int);
  80 void wake(int);
  81
  82 int
  83 main(int argc, char **argv)
  84 {
  85         char ch;
  86
  87         /* Revoke setgid privileges */
  88         setgid(getgid());
  89
  90         if (argc == 2)
  91                 start_len = atoi(argv[1]);
  92         if ((start_len <= 0) || (start_len > 500))
  93                 start_len = LENGTH;
  94         setbuf(stdout, outbuf);
  95         srandomdev();
  96         signal(SIGALRM, wake);
  97         signal(SIGINT, leave);
  98         signal(SIGQUIT, leave);
  99         signal(SIGTSTP, suspend);       /* process control signal */
 100         initscr();
 101         cbreak();
 102         noecho();
 103         slow = (baudrate() <= B1200);
 104         clear();
 105         stw = newwin(1, COLS-1, 0, 0);
 106         tv = newwin(LINES-1, COLS-1, 1, 0);
 107         box(tv, '*', '*');
 108         scrollok(tv, FALSE);
 109         scrollok(stw, FALSE);
 110         wmove(stw, 0, 0);
 111         wprintw(stw, " Worm");
 112         refresh();
 113         wrefresh(stw);
 114         wrefresh(tv);
 115         life();                 /* Create the worm */
 116         prize();                /* Put up a goal */
 117         while(1)
 118         {
 119                 if (running)
 120                 {
 121                         running--;
 122                         process(lastch);
 123                 }
 124                 else
 125                 {
 126                     fflush(stdout);
 127                     if (read(0, &ch, 1) >= 0)
 128                         process(ch);
 129                 }
 130         }
 131 }
 132
 133 void
 134 life(void)
 135 {
 136         struct body *bp, *np;
 137         int i;
 138
 139         np = NULL;
 140         head = newlink();
 141         head->x = start_len+2;
 142         head->y = 12;
 143         head->next = NULL;
 144         display(head, HEAD);
 145         for (i = 0, bp = head; i < start_len; i++, bp = np) {
 146                 np = newlink();
 147                 np->next = bp;
 148                 bp->prev = np;
 149                 np->x = bp->x - 1;
 150                 np->y = bp->y;
 151                 display(np, BODY);
 152         }
 153         tail = np;
 154         tail->prev = NULL;
 155 }
 156
 157 void
 158 display(struct body *pos, char chr)
 159 {
 160         wmove(tv, pos->y, pos->x);
 161         waddch(tv, chr);
 162 }
 163
 164 void
 165 leave(int sig __unused)
 166 {
 167         endwin();
 168         exit(0);
 169 }
 170
 171 void
 172 wake(int sig __unused)
 173 {
 174         signal(SIGALRM, wake);
 175         fflush(stdout);
 176         process(lastch);
 177 }
 178
 179 long
 180 rnd(int range)
 181 {
 182         return (random() % range);
 183 }
 184
 185 void
 186 newpos(struct body *bp)
 187 {
 188         do {
 189                 bp->y = rnd(LINES-3)+ 2;
 190                 bp->x = rnd(COLS-3) + 1;
 191                 wmove(tv, bp->y, bp->x);
 192         } while(winch(tv) != ' ');
 193 }
 194
 195 void
 196 prize(void)
 197 {
 198         int value;
 199
 200         value = rnd(9) + 1;
 201         newpos(&goody);
 202         waddch(tv, value+'0');
 203         wrefresh(tv);
 204 }
 205
 206 void
 207 process(char ch)
 208 {
 209         int x,y;
 210         struct body *nh;
 211
 212         alarm(0);
 213         x = head->x;
 214         y = head->y;
 215         switch(ch)
 216         {
 217                 case 'h': x--; break;
 218                 case 'j': y++; break;
 219                 case 'k': y--; break;
 220                 case 'l': x++; break;
 221                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 222                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 223                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 224                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 225                 case '\f': setup(); return;
 226                 case CNTRL('Z'): suspend(0); return;
 227                 case CNTRL('C'): crash(); return;
 228                 case CNTRL('D'): crash(); return;
 229                 default: if (! running) alarm(1);
 230                            return;
 231         }
 232         lastch = ch;
 233         if (growing == 0)
 234         {
 235                 display(tail, ' ');
 236                 tail->next->prev = NULL;
 237                 nh = tail->next;
 238                 free(tail);
 239                 tail = nh;
 240         }
 241         else growing--;
 242         display(head, BODY);
 243         wmove(tv, y, x);
 244         if (isdigit(ch = winch(tv)))
 245         {
 246                 growing += ch-'0';
 247                 prize();
 248                 score += growing;
 249                 running = 0;
 250                 wmove(stw, 0, 68);
 251                 wprintw(stw, "Score: %3d", score);
 252                 wrefresh(stw);
 253         }
 254         else if(ch != ' ') crash();
 255         nh = newlink();
 256         nh->next = NULL;
 257         nh->prev = head;
 258         head->next = nh;
 259         nh->y = y;
 260         nh->x = x;
 261         display(nh, HEAD);
 262         head = nh;
 263         if (!(slow && running))
 264                 wrefresh(tv);
 265         if (!running)
 266                 alarm(1);
 267 }
 268
 269 void
 270 crash(void)
 271 {
 272         sleep(2);
 273         clear();
 274         move(23, 0);
 275         refresh();
 276         printf("Well, you ran into something and the game is over.\n");
 277         printf("Your final score was %d\n", score);
 278         leave(0);
 279 }
 280
 281 void
 282 suspend(int sig __unused)
 283 {
 284         move(LINES-1, 0);
 285         refresh();
 286         endwin();
 287         fflush(stdout);
 288         kill(getpid(), SIGTSTP);
 289         signal(SIGTSTP, suspend);
 290         cbreak();
 291         noecho();
 292         setup();
 293 }
 294
 295 void
 296 setup(void)
 297 {
 298         clear();
 299         refresh();
 300         touchwin(stw);
 301         wrefresh(stw);
 302         touchwin(tv);
 303         wrefresh(tv);
 304         alarm(1);
 305 }