games/worm/worm.c

   1 /*      $NetBSD: worm.c,v 1.31 2015/08/17 17:17:01 dholland 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 1.31 2015/08/17 17:17:01 dholland 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 HEAD '@'
  60 #define BODY 'o'
  61 #define LENGTH 7
  62 #define RUNLEN 8
  63 #define CNTRL(p) (p-'A'+1)
  64
  65 struct body {
  66         int x;
  67         int y;
  68         struct body *prev;
  69         struct body *next;
  70 };
  71
  72 static WINDOW *tv;
  73 static WINDOW *stw;
  74 static struct body *head, *tail, goody;
  75 static int growing = 0;
  76 static int running = 0;
  77 static int slow = 0;
  78 static int score = 0;
  79 static int start_len = LENGTH;
  80 static int visible_len;
  81 static int lastch;
  82 static char outbuf[BUFSIZ];
  83
  84 int     main(int, char **);
  85 static void crash(void) __dead;
  86 static void display(const struct body *, char);
  87 static void leave(int) __dead;
  88 static void life(void);
  89 static void newpos(struct body *);
  90 static void process(int);
  91 static void prize(void);
  92 static int rnd(int);
  93 static void setup(void);
  94 static void wake(int);
  95
  96 static struct body *
  97 newlink(void)
  98 {
  99         struct body *b;
 100
 101         b = malloc(sizeof(*b));
 102         if (b == NULL) {
 103                 err(EXIT_FAILURE, NULL);
 104         }
 105         return b;
 106 }
 107
 108 int
 109 main(int argc, char **argv)
 110 {
 111
 112         /* Revoke setgid privileges */
 113         setgid(getgid());
 114
 115         setbuf(stdout, outbuf);
 116         srand(getpid());
 117         signal(SIGALRM, wake);
 118         signal(SIGINT, leave);
 119         signal(SIGQUIT, leave);
 120         if (!initscr())
 121                 errx(0, "couldn't initialize screen");
 122         cbreak();
 123         noecho();
 124 #ifdef KEY_LEFT
 125         keypad(stdscr, TRUE);
 126 #endif
 127         slow = (baudrate() <= 1200);
 128         clear();
 129         if (COLS < 18 || LINES < 5) {
 130                 /*
 131                  * Insufficient room for the line with " Worm" and the
 132                  * score if fewer than 18 columns; insufficient room for
 133                  * anything much if fewer than 5 lines.
 134                  */
 135                 endwin();
 136                 errx(1, "screen too small");
 137         }
 138         if (argc == 2)
 139                 start_len = atoi(argv[1]);
 140         if ((start_len <= 0) || (start_len > ((LINES-3) * (COLS-2)) / 3))
 141                 start_len = LENGTH;
 142         stw = newwin(1, COLS-1, 0, 0);
 143         tv = newwin(LINES-1, COLS-1, 1, 0);
 144         box(tv, '*', '*');
 145         scrollok(tv, FALSE);
 146         scrollok(stw, FALSE);
 147         wmove(stw, 0, 0);
 148         wprintw(stw, " Worm");
 149         refresh();
 150         wrefresh(stw);
 151         wrefresh(tv);
 152         life();                 /* Create the worm */
 153         prize();                /* Put up a goal */
 154         while(1)
 155         {
 156                 if (running)
 157                 {
 158                         running--;
 159                         process(lastch);
 160                 }
 161                 else
 162                 {
 163                     fflush(stdout);
 164                     process(getch());
 165                 }
 166         }
 167 }
 168
 169 static void
 170 life(void)
 171 {
 172         struct body *bp, *np;
 173         int i, j = 1;
 174
 175         np = NULL;
 176         head = newlink();
 177         head->x = start_len % (COLS-5) + 2;
 178         head->y = LINES / 2;
 179         head->next = NULL;
 180         display(head, HEAD);
 181         for (i = 0, bp = head; i < start_len; i++, bp = np) {
 182                 np = newlink();
 183                 np->next = bp;
 184                 bp->prev = np;
 185                 if (((bp->x <= 2) && (j == 1)) || ((bp->x >= COLS-4) && (j == -1))) {
 186                         j *= -1;
 187                         np->x = bp->x;
 188                         np->y = bp->y + 1;
 189                 } else {
 190                         np->x = bp->x - j;
 191                         np->y = bp->y;
 192                 }
 193                 display(np, BODY);
 194         }
 195         tail = np;
 196         tail->prev = NULL;
 197         visible_len = start_len + 1;
 198 }
 199
 200 static void
 201 display(const struct body *pos, char chr)
 202 {
 203         wmove(tv, pos->y, pos->x);
 204         waddch(tv, chr);
 205 }
 206
 207 static void
 208 leave(int dummy)
 209 {
 210         endwin();
 211
 212         if (dummy == 0){        /* called via crash() */
 213                 printf("\nWell, you ran into something and the game is over.\n");
 214                 printf("Your final score was %d\n\n", score);
 215         }
 216         exit(0);
 217 }
 218
 219 static void
 220 wake(int dummy)
 221 {
 222         signal(SIGALRM, wake);
 223         fflush(stdout);
 224         process(lastch);
 225 }
 226
 227 static int
 228 rnd(int range)
 229 {
 230         return abs((rand()>>5)+(rand()>>5)) % range;
 231 }
 232
 233 static void
 234 newpos(struct body *bp)
 235 {
 236         if (visible_len == (LINES-3) * (COLS-3) - 1) {
 237                 endwin();
 238
 239                 printf("\nYou won!\n");
 240                 printf("Your final score was %d\n\n", score);
 241                 exit(0);
 242         }
 243         do {
 244                 bp->y = rnd(LINES-3)+ 1;
 245                 bp->x = rnd(COLS-3) + 1;
 246                 wmove(tv, bp->y, bp->x);
 247         } while(winch(tv) != ' ');
 248 }
 249
 250 static void
 251 prize(void)
 252 {
 253         int value;
 254
 255         value = rnd(9) + 1;
 256         newpos(&goody);
 257         waddch(tv, value+'0');
 258         wrefresh(tv);
 259 }
 260
 261 static void
 262 process(int ch)
 263 {
 264         int x,y;
 265         struct body *nh;
 266
 267         alarm(0);
 268         x = head->x;
 269         y = head->y;
 270         switch(ch)
 271         {
 272 #ifdef KEY_LEFT
 273                 case KEY_LEFT:
 274 #endif
 275                 case 'h':
 276                         x--; break;
 277
 278 #ifdef KEY_DOWN
 279                 case KEY_DOWN:
 280 #endif
 281                 case 'j':
 282                         y++; break;
 283
 284 #ifdef KEY_UP
 285                 case KEY_UP:
 286 #endif
 287                 case 'k':
 288                         y--; break;
 289
 290 #ifdef KEY_RIGHT
 291                 case KEY_RIGHT:
 292 #endif
 293                 case 'l':
 294                         x++; break;
 295
 296                 case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
 297                 case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
 298                 case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
 299                 case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
 300                 case '\f': setup(); return;
 301
 302                 case ERR:
 303                 case CNTRL('C'):
 304                 case CNTRL('D'):
 305                         crash();
 306                         return;
 307
 308                 default: if (! running) alarm(1);
 309                            return;
 310         }
 311         lastch = ch;
 312         if (growing == 0)
 313         {
 314                 display(tail, ' ');
 315                 tail->next->prev = NULL;
 316                 nh = tail->next;
 317                 free(tail);
 318                 tail = nh;
 319                 visible_len--;
 320         }
 321         else growing--;
 322         display(head, BODY);
 323         wmove(tv, y, x);
 324         if (isdigit(ch = winch(tv)))
 325         {
 326                 growing += ch-'0';
 327                 prize();
 328                 score += growing;
 329                 running = 0;
 330                 wmove(stw, 0, COLS - 12);
 331                 wprintw(stw, "Score: %3d", score);
 332                 wrefresh(stw);
 333         }
 334         else if(ch != ' ') crash();
 335         nh = newlink();
 336         nh->next = NULL;
 337         nh->prev = head;
 338         head->next = nh;
 339         nh->y = y;
 340         nh->x = x;
 341         display(nh, HEAD);
 342         head = nh;
 343         visible_len++;
 344         if (!(slow && running))
 345         {
 346                 wmove(tv, head->y, head->x);
 347                 wrefresh(tv);
 348         }
 349         if (!running)
 350                 alarm(1);
 351 }
 352
 353 static void
 354 crash(void)
 355 {
 356         leave(0);
 357 }
 358
 359 static void
 360 setup(void)
 361 {
 362         clear();
 363         refresh();
 364         touchwin(stw);
 365         wrefresh(stw);
 366         touchwin(tv);
 367         wrefresh(tv);
 368         alarm(1);
 369 }