games/worm/worm.c

   1 /*      $NetBSD: worm.c,v 1.28 2008/08/08 16:10:47 drochner 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)worm.c      8.1 (Berkeley) 5/31/93";
  41 #else
  42 __RCSID("$NetBSD: worm.c,v 1.28 2008/08/08 16:10:47 drochner Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * Worm.  Written by Michael Toy
  48  * UCSC
  49  */
  50
  51 #include <ctype.h>
  52 #include <curses.h>
  53 #include <err.h>
  54 #include <signal.h>
  55 #include <stdlib.h>
  56 #include <termios.h>
  57 #include <unistd.h>
  58
  59 #define newlink() (struct body *) malloc(sizeof (struct body));
  60 #define HEAD '@'
  61 #define BODY 'o'
  62 #define LENGTH 7
  63 #define RUNLEN 8
  64 #define CNTRL(p) (p-'A'+1)
  65
  66 struct body {
  67         int x;
  68         int y;
  69         struct body *prev;
  70         struct body *next;
  71 };
  72
  73 static WINDOW *tv;
  74 static WINDOW *stw;
  75 static struct body *head, *tail, goody;
  76 static int growing = 0;
  77 static int running = 0;
  78 static int slow = 0;
  79 static int score = 0;
  80 static int start_len = LENGTH;
  81 static int visible_len;
  82 static int lastch;
  83 static char outbuf[BUFSIZ];
  84
  85 int     main(int, char **);
  86 static void crash(void) __dead;
  87 static void display(const struct body *, char);
  88 static void leave(int) __dead;
  89 static void life(void);
  90 static void newpos(struct body *);
  91 static void process(int);
  92 static void prize(void);
  93 static int rnd(int);
  94 static void setup(void);
  95 static void wake(int);
  96
  97 int
  98 main(argc, argv)
  99         int argc;
 100         char **argv;
 101 {
 102
 103         /* Revoke setgid privileges */
 104         setgid(getgid());
 105
 106         setbuf(stdout, outbuf);
 107         srand(getpid());
 108         signal(SIGALRM, wake);
 109         signal(SIGINT, leave);
 110         signal(SIGQUIT, leave);
 111         if (!initscr())
 112                 errx(0, "couldn't initialize screen");
 113         cbreak();
 114         noecho();
 115 #ifdef KEY_LEFT
 116         keypad(stdscr, TRUE);
 117 #endif
 118         slow = (baudrate() <= 1200);
 119         clear();
 120         if (COLS < 18 || LINES < 5) {
 121                 /*
 122                  * Insufficient room for the line with " Worm" and the
 123                  * score if fewer than 18 columns; insufficient room for
 124                  * anything much if fewer than 5 lines.
 125                  */
 126                 endwin();
 127                 errx(1, "screen too small");
 128         }
 129         if (argc == 2)
 130                 start_len = atoi(argv[1]);
 131         if ((start_len <= 0) || (start_len > ((LINES-3) * (COLS-2)) / 3))
 132                 start_len = LENGTH;
 133         stw = newwin(1, COLS-1, 0, 0);
 134         tv = newwin(LINES-1, COLS-1, 1, 0);
 135         box(tv, '*', '*');
 136         scrollok(tv, FALSE);
 137         scrollok(stw, FALSE);
 138         wmove(stw, 0, 0);
 139         wprintw(stw, " Worm");
 140         refresh();
 141         wrefresh(stw);
 142         wrefresh(tv);
 143         life();                 /* Create the worm */
 144         prize();                /* Put up a goal */
 145         while(1)
 146         {
 147                 if (running)
 148                 {
 149                         running--;
 150                         process(lastch);
 151                 }
 152                 else
 153                 {
 154                     fflush(stdout);
 155                     process(getch());
 156                 }
 157         }
 158 }
 159
 160 static void
 161 life()
 162 {
 163         struct body *bp, *np;
 164         int i, j = 1;
 165
 166         np = NULL;
 167         head = newlink();
 168         if (head == NULL)
 169                 err(1, NULL);
 170         head->x = start_len % (COLS-5) + 2;
 171         head->y = LINES / 2;
 172         head->next = NULL;
 173         display(head, HEAD);
 174         for (i = 0, bp = head; i < start_len; i++, bp = np) {
 175                 np = newlink();
 176                 if (np == NULL)
 177                         err(1, NULL);
 178                 np->next = bp;
 179                 bp->prev = np;
 180                 if (((bp->x <= 2) && (j == 1)) || ((bp->x >= COLS-4) && (j == -1))) {
 181                         j *= -1;
 182                         np->x = bp->x;
 183                         np->y = bp->y + 1;
 184                 } else {
 185                         np->x = bp->x - j;
 186                         np->y = bp->y;
 187                 }
 188                 display(np, BODY);
 189         }
 190         tail = np;
 191         tail->prev = NULL;
 192         visible_len = start_len + 1;
 193 }
 194
 195 static void
 196 display(pos, chr)
 197         const struct body *pos;
 198         char chr;
 199 {
 200         wmove(tv, pos->y, pos->x);
 201         waddch(tv, chr);
 202 }
 203
 204 static void
 205 leave(dummy)
 206         int dummy;
 207 {
 208         endwin();
 209
 210         if (dummy == 0){        /* called via crash() */
 211                 printf("\nWell, you ran into something and the game is over.\n");
 212                 printf("Your final score was %d\n\n", score);
 213         }
 214         exit(0);
 215 }
 216
 217 static void
 218 wake(dummy)
 219         int dummy __unused;
 220 {
 221         signal(SIGALRM, wake);
 222         fflush(stdout);
 223         process(lastch);
 224 }
 225
 226 static int
 227 rnd(range)
 228         int range;
 229 {
 230         return abs((rand()>>5)+(rand()>>5)) % range;
 231 }
 232
 233 static void
 234 newpos(bp)
 235         struct body * bp;
 236 {
 237         if (visible_len == (LINES-3) * (COLS-3) - 1) {
 238                 endwin();
 239
 240                 printf("\nYou won!\n");
 241                 printf("Your final score was %d\n\n", score);
 242                 exit(0);
 243         }
 244         do {
 245                 bp->y = rnd(LINES-3)+ 1;
 246                 bp->x = rnd(COLS-3) + 1;
 247                 wmove(tv, bp->y, bp->x);
 248         } while(winch(tv) != ' ');
 249 }
 250
 251 static void
 252 prize()
 253 {
 254         int value;
 255
 256         value = rnd(9) + 1;
 257         newpos(&goody);
 258         waddch(tv, value+'0');
 259         wrefresh(tv);
 260 }
 261
 262 static void
 263 process(ch)
 264         int ch;
 265 {
 266         int x,y;
 267         struct body *nh;
 268
 269         alarm(0);
 270         x = head->x;
 271         y = head->y;
 272         switch(ch)
 273         {
 274 #ifdef KEY_LEFT
 275                 case KEY_LEFT:
 276 #endif
 277                 case 'h':
 278                         x--; break;
 279
 280 #ifdef KEY_DOWN
 281                 case KEY_DOWN:
 282 #endif
 283                 case 'j':
 284                         y++; break;
 285
 286 #ifdef KEY_UP
 287                 case KEY_UP:
 288 #endif
 289                 case 'k':
 290                         y--; break;
 291
 292 #ifdef KEY_RIGHT
 293                 case KEY_RIGHT:
 294 #endif
 295                 case 'l':
 296                         x++; break;
 297
 298                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 299                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 300                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 301                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 302                 case '\f': setup(); return;
 303
 304                 case ERR:
 305                 case CNTRL('C'):
 306                 case CNTRL('D'):
 307                         crash();
 308                         return;
 309
 310                 default: if (! running) alarm(1);
 311                            return;
 312         }
 313         lastch = ch;
 314         if (growing == 0)
 315         {
 316                 display(tail, ' ');
 317                 tail->next->prev = NULL;
 318                 nh = tail->next;
 319                 free(tail);
 320                 tail = nh;
 321                 visible_len--;
 322         }
 323         else growing--;
 324         display(head, BODY);
 325         wmove(tv, y, x);
 326         if (isdigit(ch = winch(tv)))
 327         {
 328                 growing += ch-'0';
 329                 prize();
 330                 score += growing;
 331                 running = 0;
 332                 wmove(stw, 0, COLS - 12);
 333                 wprintw(stw, "Score: %3d", score);
 334                 wrefresh(stw);
 335         }
 336         else if(ch != ' ') crash();
 337         nh = newlink();
 338         if (nh == NULL)
 339                 err(1, NULL);
 340         nh->next = NULL;
 341         nh->prev = head;
 342         head->next = nh;
 343         nh->y = y;
 344         nh->x = x;
 345         display(nh, HEAD);
 346         head = nh;
 347         visible_len++;
 348         if (!(slow && running))
 349         {
 350                 wmove(tv, head->y, head->x);
 351                 wrefresh(tv);
 352         }
 353         if (!running)
 354                 alarm(1);
 355 }
 356
 357 static void
 358 crash()
 359 {
 360         leave(0);
 361 }
 362
 363 static void
 364 setup()
 365 {
 366         clear();
 367         refresh();
 368         touchwin(stw);
 369         wrefresh(stw);
 370         touchwin(tv);
 371         wrefresh(tv);
 372         alarm(1);
 373 }