worm/worm.c

   1 /*      $NetBSD: worm.c,v 1.7 1995/04/29 01:12:41 mycroft 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 #ifndef lint
  37 static char copyright[] =
  38 "@(#) 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 static char rcsid[] = "$NetBSD: worm.c,v 1.7 1995/04/29 01:12:41 mycroft 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
  61 #define newlink() (struct body *) malloc(sizeof (struct body));
  62 #define HEAD '@'
  63 #define BODY 'o'
  64 #define LENGTH 7
  65 #define RUNLEN 8
  66 #define CNTRL(p) (p-'A'+1)
  67
  68 WINDOW *tv;
  69 WINDOW *stw;
  70 struct body {
  71         int x;
  72         int y;
  73         struct body *prev;
  74         struct body *next;
  75 } *head, *tail, goody;
  76 int growing = 0;
  77 int running = 0;
  78 int slow = 0;
  79 int score = 0;
  80 int start_len = LENGTH;
  81 char lastch;
  82 char outbuf[BUFSIZ];
  83
  84 void leave(), wake(), suspend();
  85
  86 main(argc, argv)
  87         int argc;
  88         char **argv;
  89 {
  90         char ch;
  91
  92         if (argc == 2)
  93                 start_len = atoi(argv[1]);
  94         if ((start_len <= 0) || (start_len > 500))
  95                 start_len = LENGTH;
  96         setbuf(stdout, outbuf);
  97         srand(getpid());
  98         signal(SIGALRM, wake);
  99         signal(SIGINT, leave);
 100         signal(SIGQUIT, leave);
 101         signal(SIGTSTP, suspend);       /* process control signal */
 102         initscr();
 103         crmode();
 104         noecho();
 105         slow = (baudrate() <= 1200);
 106         clear();
 107         stw = newwin(1, COLS-1, 0, 0);
 108         tv = newwin(LINES-1, COLS-1, 1, 0);
 109         box(tv, '*', '*');
 110         scrollok(tv, FALSE);
 111         scrollok(stw, FALSE);
 112         wmove(stw, 0, 0);
 113         wprintw(stw, " Worm");
 114         refresh();
 115         wrefresh(stw);
 116         wrefresh(tv);
 117         life();                 /* Create the worm */
 118         prize();                /* Put up a goal */
 119         while(1)
 120         {
 121                 if (running)
 122                 {
 123                         running--;
 124                         process(lastch);
 125                 }
 126                 else
 127                 {
 128                     fflush(stdout);
 129                     if (read(0, &ch, 1) >= 0)
 130                         process(ch);
 131                 }
 132         }
 133 }
 134
 135 life()
 136 {
 137         register struct body *bp, *np;
 138         register int i;
 139
 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 display(pos, chr)
 158 struct body *pos;
 159 char chr;
 160 {
 161         wmove(tv, pos->y, pos->x);
 162         waddch(tv, chr);
 163 }
 164
 165 void
 166 leave()
 167 {
 168         endwin();
 169         exit(0);
 170 }
 171
 172 void
 173 wake()
 174 {
 175         signal(SIGALRM, wake);
 176         fflush(stdout);
 177         process(lastch);
 178 }
 179
 180 rnd(range)
 181 {
 182         return abs((rand()>>5)+(rand()>>5)) % range;
 183 }
 184
 185 newpos(bp)
 186 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 prize()
 196 {
 197         int value;
 198
 199         value = rnd(9) + 1;
 200         newpos(&goody);
 201         waddch(tv, value+'0');
 202         wrefresh(tv);
 203 }
 204
 205 process(ch)
 206 char ch;
 207 {
 208         register int x,y;
 209         struct body *nh;
 210
 211         alarm(0);
 212         x = head->x;
 213         y = head->y;
 214         switch(ch)
 215         {
 216                 case 'h': x--; break;
 217                 case 'j': y++; break;
 218                 case 'k': y--; break;
 219                 case 'l': x++; break;
 220                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 221                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 222                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 223                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 224                 case '\f': setup(); return;
 225                 case CNTRL('Z'): suspend(); return;
 226                 case CNTRL('C'): crash(); return;
 227                 case CNTRL('D'): crash(); return;
 228                 default: if (! running) alarm(1);
 229                            return;
 230         }
 231         lastch = ch;
 232         if (growing == 0)
 233         {
 234                 display(tail, ' ');
 235                 tail->next->prev = NULL;
 236                 nh = tail->next;
 237                 free(tail);
 238                 tail = nh;
 239         }
 240         else growing--;
 241         display(head, BODY);
 242         wmove(tv, y, x);
 243         if (isdigit(ch = winch(tv)))
 244         {
 245                 growing += ch-'0';
 246                 prize();
 247                 score += growing;
 248                 running = 0;
 249                 wmove(stw, 0, 68);
 250                 wprintw(stw, "Score: %3d", score);
 251                 wrefresh(stw);
 252         }
 253         else if(ch != ' ') crash();
 254         nh = newlink();
 255         nh->next = NULL;
 256         nh->prev = head;
 257         head->next = nh;
 258         nh->y = y;
 259         nh->x = x;
 260         display(nh, HEAD);
 261         head = nh;
 262         if (!(slow && running))
 263                 wrefresh(tv);
 264         if (!running)
 265                 alarm(1);
 266 }
 267
 268 crash()
 269 {
 270         sleep(2);
 271         clear();
 272         move(23, 0);
 273         refresh();
 274         printf("Well, you ran into something and the game is over.\n");
 275         printf("Your final score was %d\n", score);
 276         leave();
 277 }
 278
 279 void
 280 suspend()
 281 {
 282         char *sh;
 283
 284         move(LINES-1, 0);
 285         refresh();
 286         endwin();
 287         fflush(stdout);
 288         kill(getpid(), SIGTSTP);
 289         signal(SIGTSTP, suspend);
 290         crmode();
 291         noecho();
 292         setup();
 293 }
 294
 295 setup()
 296 {
 297         clear();
 298         refresh();
 299         touchwin(stw);
 300         wrefresh(stw);
 301         touchwin(tv);
 302         wrefresh(tv);
 303         alarm(1);
 304 }