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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)worm.c   8.1 (Berkeley) 5/31/93
  35  * $FreeBSD: src/games/worm/worm.c,v 1.9 1999/12/07 02:01:27 billf Exp $
  36  * $DragonFly: src/games/worm/worm.c,v 1.5 2006/09/07 21:28:27 pavalos Exp $
  37  */
  38
  39 /*
  40  * Worm.  Written by Michael Toy
  41  * UCSC
  42  */
  43
  44 #include <ctype.h>
  45 #include <curses.h>
  46 #include <signal.h>
  47 #include <stdlib.h>
  48 #include <termios.h>
  49 #include <unistd.h>
  50
  51 #define newlink() (struct body *) malloc(sizeof (struct body));
  52 #define HEAD '@'
  53 #define BODY 'o'
  54 #define LENGTH 7
  55 #define RUNLEN 8
  56 #define CNTRL(p) (p-'A'+1)
  57
  58 WINDOW *tv;
  59 WINDOW *stw;
  60 struct body {
  61         int x;
  62         int y;
  63         struct body *prev;
  64         struct body *next;
  65 } *head, *tail, goody;
  66 int growing = 0;
  67 int running = 0;
  68 int slow = 0;
  69 int score = 0;
  70 int start_len = LENGTH;
  71 char lastch;
  72 char outbuf[BUFSIZ];
  73
  74 void crash (void);
  75 void display (struct body *, char);
  76 void leave (int);
  77 void life (void);
  78 void newpos (struct body *);
  79 void prize (void);
  80 void process (char);
  81 long rnd (int);
  82 void setup (void);
  83 void suspend (int);
  84 void wake (int);
  85
  86 int
  87 main(int argc, char **argv)
  88 {
  89         char ch;
  90
  91         /* revoke */
  92         setgid(getgid());
  93
  94         if (argc == 2)
  95                 start_len = atoi(argv[1]);
  96         if ((start_len <= 0) || (start_len > 500))
  97                 start_len = LENGTH;
  98         setbuf(stdout, outbuf);
  99         srandomdev();
 100         signal(SIGALRM, wake);
 101         signal(SIGINT, leave);
 102         signal(SIGQUIT, leave);
 103         signal(SIGTSTP, suspend);       /* process control signal */
 104         initscr();
 105         crmode();
 106         noecho();
 107         slow = (baudrate() <= B1200);
 108         clear();
 109         stw = newwin(1, COLS-1, 0, 0);
 110         tv = newwin(LINES-1, COLS-1, 1, 0);
 111         box(tv, '*', '*');
 112         scrollok(tv, FALSE);
 113         scrollok(stw, FALSE);
 114         wmove(stw, 0, 0);
 115         wprintw(stw, " Worm");
 116         refresh();
 117         wrefresh(stw);
 118         wrefresh(tv);
 119         life();                 /* Create the worm */
 120         prize();                /* Put up a goal */
 121         while(1)
 122         {
 123                 if (running)
 124                 {
 125                         running--;
 126                         process(lastch);
 127                 }
 128                 else
 129                 {
 130                     fflush(stdout);
 131                     if (read(0, &ch, 1) >= 0)
 132                         process(ch);
 133                 }
 134         }
 135 }
 136
 137 void
 138 life(void)
 139 {
 140         struct body *bp, *np;
 141         int i;
 142
 143         np = NULL;
 144         head = newlink();
 145         head->x = start_len+2;
 146         head->y = 12;
 147         head->next = NULL;
 148         display(head, HEAD);
 149         for (i = 0, bp = head; i < start_len; i++, bp = np) {
 150                 np = newlink();
 151                 np->next = bp;
 152                 bp->prev = np;
 153                 np->x = bp->x - 1;
 154                 np->y = bp->y;
 155                 display(np, BODY);
 156         }
 157         tail = np;
 158         tail->prev = NULL;
 159 }
 160
 161 void
 162 display(struct body *pos, char chr)
 163 {
 164         wmove(tv, pos->y, pos->x);
 165         waddch(tv, chr);
 166 }
 167
 168 void
 169 leave(__unused int sig)
 170 {
 171         endwin();
 172         exit(0);
 173 }
 174
 175 void
 176 wake(__unused int sig)
 177 {
 178         signal(SIGALRM, wake);
 179         fflush(stdout);
 180         process(lastch);
 181 }
 182
 183 long
 184 rnd(int range)
 185 {
 186         return random() % range;
 187 }
 188
 189 void
 190 newpos(struct body *bp)
 191 {
 192         do {
 193                 bp->y = rnd(LINES-3)+ 2;
 194                 bp->x = rnd(COLS-3) + 1;
 195                 wmove(tv, bp->y, bp->x);
 196         } while(winch(tv) != ' ');
 197 }
 198
 199 void
 200 prize(void)
 201 {
 202         int value;
 203
 204         value = rnd(9) + 1;
 205         newpos(&goody);
 206         waddch(tv, value+'0');
 207         wrefresh(tv);
 208 }
 209
 210 void
 211 process(char ch)
 212 {
 213         int x,y;
 214         struct body *nh;
 215
 216         alarm(0);
 217         x = head->x;
 218         y = head->y;
 219         switch(ch)
 220         {
 221                 case 'h': x--; break;
 222                 case 'j': y++; break;
 223                 case 'k': y--; break;
 224                 case 'l': x++; break;
 225                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 226                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 227                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 228                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 229                 case '\f': setup(); return;
 230                 case CNTRL('Z'): suspend(0); return;
 231                 case CNTRL('C'): crash(); return;
 232                 case CNTRL('D'): crash(); return;
 233                 default: if (! running) alarm(1);
 234                            return;
 235         }
 236         lastch = ch;
 237         if (growing == 0)
 238         {
 239                 display(tail, ' ');
 240                 tail->next->prev = NULL;
 241                 nh = tail->next;
 242                 free(tail);
 243                 tail = nh;
 244         }
 245         else growing--;
 246         display(head, BODY);
 247         wmove(tv, y, x);
 248         if (isdigit(ch = winch(tv)))
 249         {
 250                 growing += ch-'0';
 251                 prize();
 252                 score += growing;
 253                 running = 0;
 254                 wmove(stw, 0, 68);
 255                 wprintw(stw, "Score: %3d", score);
 256                 wrefresh(stw);
 257         }
 258         else if(ch != ' ') crash();
 259         nh = newlink();
 260         nh->next = NULL;
 261         nh->prev = head;
 262         head->next = nh;
 263         nh->y = y;
 264         nh->x = x;
 265         display(nh, HEAD);
 266         head = nh;
 267         if (!(slow && running))
 268                 wrefresh(tv);
 269         if (!running)
 270                 alarm(1);
 271 }
 272
 273 void
 274 crash(void)
 275 {
 276         sleep(2);
 277         clear();
 278         move(23, 0);
 279         refresh();
 280         printf("Well, you ran into something and the game is over.\n");
 281         printf("Your final score was %d\n", score);
 282         leave(0);
 283 }
 284
 285 void
 286 suspend(__unused int sig)
 287 {
 288         move(LINES-1, 0);
 289         refresh();
 290         endwin();
 291         fflush(stdout);
 292         kill(getpid(), SIGTSTP);
 293         signal(SIGTSTP, suspend);
 294         crmode();
 295         noecho();
 296         setup();
 297 }
 298
 299 void
 300 setup(void)
 301 {
 302         clear();
 303         refresh();
 304         touchwin(stw);
 305         wrefresh(stw);
 306         touchwin(tv);
 307         wrefresh(tv);
 308         alarm(1);
 309 }