worm/worm.c

   1 /*      $NetBSD: worm.c,v 1.9 1998/09/13 15:27:30 hubertf Exp $ */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)worm.c      8.1 (Berkeley) 5/31/93";
  45 #else
  46 __RCSID("$NetBSD: worm.c,v 1.9 1998/09/13 15:27:30 hubertf Exp $");
  47 #endif
  48 #endif /* not lint */
  49
  50 /*
  51  * Worm.  Written by Michael Toy
  52  * UCSC
  53  */
  54
  55 #include <ctype.h>
  56 #include <curses.h>
  57 #include <signal.h>
  58 #include <stdlib.h>
  59 #include <termios.h>
  60 #include <unistd.h>
  61
  62 #define newlink() (struct body *) malloc(sizeof (struct body));
  63 #define HEAD '@'
  64 #define BODY 'o'
  65 #define LENGTH 7
  66 #define RUNLEN 8
  67 #define CNTRL(p) (p-'A'+1)
  68
  69 WINDOW *tv;
  70 WINDOW *stw;
  71 struct body {
  72         int x;
  73         int y;
  74         struct body *prev;
  75         struct body *next;
  76 } *head, *tail, goody;
  77 int growing = 0;
  78 int running = 0;
  79 int slow = 0;
  80 int score = 0;
  81 int start_len = LENGTH;
  82 char lastch;
  83 char outbuf[BUFSIZ];
  84
  85 void    crash __P((void)) __attribute__((__noreturn__));
  86 void    display __P((struct body *, char));
  87 int     main __P((int, char **));
  88 void    leave __P((int)) __attribute__((__noreturn__));
  89 void    life __P((void));
  90 void    newpos __P((struct body *));
  91 void    process __P((char));
  92 void    prize __P((void));
  93 int     rnd __P((int));
  94 void    setup __P((void));
  95 void    suspend __P((int));
  96 void    wake __P((int));
  97
  98 int
  99 main(argc, argv)
 100         int argc;
 101         char **argv;
 102 {
 103         char ch;
 104
 105         if (argc == 2)
 106                 start_len = atoi(argv[1]);
 107         if ((start_len <= 0) || (start_len > 500))
 108                 start_len = LENGTH;
 109         setbuf(stdout, outbuf);
 110         srand(getpid());
 111         signal(SIGALRM, wake);
 112         signal(SIGINT, leave);
 113         signal(SIGQUIT, leave);
 114         signal(SIGTSTP, suspend);       /* process control signal */
 115         initscr();
 116         crmode();
 117         noecho();
 118         slow = (baudrate() <= 1200);
 119         clear();
 120         stw = newwin(1, COLS-1, 0, 0);
 121         tv = newwin(LINES-1, COLS-1, 1, 0);
 122         box(tv, '*', '*');
 123         scrollok(tv, FALSE);
 124         scrollok(stw, FALSE);
 125         wmove(stw, 0, 0);
 126         wprintw(stw, " Worm");
 127         refresh();
 128         wrefresh(stw);
 129         wrefresh(tv);
 130         life();                 /* Create the worm */
 131         prize();                /* Put up a goal */
 132         while(1)
 133         {
 134                 if (running)
 135                 {
 136                         running--;
 137                         process(lastch);
 138                 }
 139                 else
 140                 {
 141                     fflush(stdout);
 142                     if (read(0, &ch, 1) >= 0)
 143                         process(ch);
 144                 }
 145         }
 146 }
 147
 148 void
 149 life()
 150 {
 151         struct body *bp, *np;
 152         int i;
 153
 154         np = NULL;
 155         head = newlink();
 156         head->x = start_len+2;
 157         head->y = 12;
 158         head->next = NULL;
 159         display(head, HEAD);
 160         for (i = 0, bp = head; i < start_len; i++, bp = np) {
 161                 np = newlink();
 162                 np->next = bp;
 163                 bp->prev = np;
 164                 np->x = bp->x - 1;
 165                 np->y = bp->y;
 166                 display(np, BODY);
 167         }
 168         tail = np;
 169         tail->prev = NULL;
 170 }
 171
 172 void
 173 display(pos, chr)
 174         struct body *pos;
 175         char chr;
 176 {
 177         wmove(tv, pos->y, pos->x);
 178         waddch(tv, chr);
 179 }
 180
 181 void
 182 leave(dummy)
 183         int dummy;
 184 {
 185         endwin();
 186         exit(0);
 187 }
 188
 189 void
 190 wake(dummy)
 191         int dummy;
 192 {
 193         signal(SIGALRM, wake);
 194         fflush(stdout);
 195         process(lastch);
 196 }
 197
 198 int
 199 rnd(range)
 200         int range;
 201 {
 202         return abs((rand()>>5)+(rand()>>5)) % range;
 203 }
 204
 205 void
 206 newpos(bp)
 207         struct body * bp;
 208 {
 209         do {
 210                 bp->y = rnd(LINES-3)+ 2;
 211                 bp->x = rnd(COLS-3) + 1;
 212                 wmove(tv, bp->y, bp->x);
 213         } while(winch(tv) != ' ');
 214 }
 215
 216 void
 217 prize()
 218 {
 219         int value;
 220
 221         value = rnd(9) + 1;
 222         newpos(&goody);
 223         waddch(tv, value+'0');
 224         wrefresh(tv);
 225 }
 226
 227 void
 228 process(ch)
 229         char ch;
 230 {
 231         int x,y;
 232         struct body *nh;
 233
 234         alarm(0);
 235         x = head->x;
 236         y = head->y;
 237         switch(ch)
 238         {
 239                 case 'h': x--; break;
 240                 case 'j': y++; break;
 241                 case 'k': y--; break;
 242                 case 'l': x++; break;
 243                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 244                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 245                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 246                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 247                 case '\f': setup(); return;
 248                 case CNTRL('Z'): suspend(0); return;
 249                 case CNTRL('C'): crash(); return;
 250                 case CNTRL('D'): crash(); return;
 251                 default: if (! running) alarm(1);
 252                            return;
 253         }
 254         lastch = ch;
 255         if (growing == 0)
 256         {
 257                 display(tail, ' ');
 258                 tail->next->prev = NULL;
 259                 nh = tail->next;
 260                 free(tail);
 261                 tail = nh;
 262         }
 263         else growing--;
 264         display(head, BODY);
 265         wmove(tv, y, x);
 266         if (isdigit(ch = winch(tv)))
 267         {
 268                 growing += ch-'0';
 269                 prize();
 270                 score += growing;
 271                 running = 0;
 272                 wmove(stw, 0, 68);
 273                 wprintw(stw, "Score: %3d", score);
 274                 wrefresh(stw);
 275         }
 276         else if(ch != ' ') crash();
 277         nh = newlink();
 278         nh->next = NULL;
 279         nh->prev = head;
 280         head->next = nh;
 281         nh->y = y;
 282         nh->x = x;
 283         display(nh, HEAD);
 284         head = nh;
 285         if (!(slow && running))
 286                 wrefresh(tv);
 287         if (!running)
 288                 alarm(1);
 289 }
 290
 291 void
 292 crash()
 293 {
 294         sleep(2);
 295         clear();
 296         move(23, 0);
 297         refresh();
 298         printf("Well, you ran into something and the game is over.\n");
 299         printf("Your final score was %d\n", score);
 300         leave(0);
 301 }
 302
 303 void
 304 suspend(dummy)
 305         int dummy;
 306 {
 307         move(LINES-1, 0);
 308         refresh();
 309         endwin();
 310         fflush(stdout);
 311         kill(getpid(), SIGTSTP);
 312         signal(SIGTSTP, suspend);
 313         crmode();
 314         noecho();
 315         setup();
 316 }
 317
 318 void
 319 setup()
 320 {
 321         clear();
 322         refresh();
 323         touchwin(stw);
 324         wrefresh(stw);
 325         touchwin(tv);
 326         wrefresh(tv);
 327         alarm(1);
 328 }