games/worms/worms.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  * @(#)worms.c  8.1 (Berkeley) 5/31/93
  35  * $FreeBSD: src/games/worms/worms.c,v 1.8.2.1 2000/12/04 10:36:17 alex Exp $
  36  * $DragonFly: src/games/worms/worms.c,v 1.5 2007/04/18 18:32:12 swildner Exp $
  37  */
  38
  39 /*
  40  *
  41  *       @@@        @@@    @@@@@@@@@@     @@@@@@@@@@@    @@@@@@@@@@@@
  42  *       @@@        @@@   @@@@@@@@@@@@    @@@@@@@@@@@@   @@@@@@@@@@@@@
  43  *       @@@        @@@  @@@@      @@@@   @@@@           @@@@ @@@  @@@@
  44  *       @@@   @@   @@@  @@@        @@@   @@@            @@@  @@@   @@@
  45  *       @@@  @@@@  @@@  @@@        @@@   @@@            @@@  @@@   @@@
  46  *       @@@@ @@@@ @@@@  @@@        @@@   @@@            @@@  @@@   @@@
  47  *        @@@@@@@@@@@@   @@@@      @@@@   @@@            @@@  @@@   @@@
  48  *         @@@@  @@@@     @@@@@@@@@@@@    @@@            @@@  @@@   @@@
  49  *          @@    @@       @@@@@@@@@@     @@@            @@@  @@@   @@@
  50  *
  51  *                               Eric P. Scott
  52  *                        Caltech High Energy Physics
  53  *                               October, 1980
  54  *
  55  */
  56 #include <sys/types.h>
  57 #include <curses.h>
  58 #include <err.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <unistd.h>
  63
  64 static const struct options {
  65         int nopts;
  66         int opts[3];
  67 }
  68         normal[8] = {
  69         { 3, { 7, 0, 1 } },
  70         { 3, { 0, 1, 2 } },
  71         { 3, { 1, 2, 3 } },
  72         { 3, { 2, 3, 4 } },
  73         { 3, { 3, 4, 5 } },
  74         { 3, { 4, 5, 6 } },
  75         { 3, { 5, 6, 7 } },
  76         { 3, { 6, 7, 0 } }
  77 },      upper[8] = {
  78         { 1, { 1, 0, 0 } },
  79         { 2, { 1, 2, 0 } },
  80         { 0, { 0, 0, 0 } },
  81         { 0, { 0, 0, 0 } },
  82         { 0, { 0, 0, 0 } },
  83         { 2, { 4, 5, 0 } },
  84         { 1, { 5, 0, 0 } },
  85         { 2, { 1, 5, 0 } }
  86 },
  87         left[8] = {
  88         { 0, { 0, 0, 0 } },
  89         { 0, { 0, 0, 0 } },
  90         { 0, { 0, 0, 0 } },
  91         { 2, { 2, 3, 0 } },
  92         { 1, { 3, 0, 0 } },
  93         { 2, { 3, 7, 0 } },
  94         { 1, { 7, 0, 0 } },
  95         { 2, { 7, 0, 0 } }
  96 },
  97         right[8] = {
  98         { 1, { 7, 0, 0 } },
  99         { 2, { 3, 7, 0 } },
 100         { 1, { 3, 0, 0 } },
 101         { 2, { 3, 4, 0 } },
 102         { 0, { 0, 0, 0 } },
 103         { 0, { 0, 0, 0 } },
 104         { 0, { 0, 0, 0 } },
 105         { 2, { 6, 7, 0 } }
 106 },
 107         lower[8] = {
 108         { 0, { 0, 0, 0 } },
 109         { 2, { 0, 1, 0 } },
 110         { 1, { 1, 0, 0 } },
 111         { 2, { 1, 5, 0 } },
 112         { 1, { 5, 0, 0 } },
 113         { 2, { 5, 6, 0 } },
 114         { 0, { 0, 0, 0 } },
 115         { 0, { 0, 0, 0 } }
 116 },
 117         upleft[8] = {
 118         { 0, { 0, 0, 0 } },
 119         { 0, { 0, 0, 0 } },
 120         { 0, { 0, 0, 0 } },
 121         { 0, { 0, 0, 0 } },
 122         { 0, { 0, 0, 0 } },
 123         { 1, { 3, 0, 0 } },
 124         { 2, { 1, 3, 0 } },
 125         { 1, { 1, 0, 0 } }
 126 },
 127         upright[8] = {
 128         { 2, { 3, 5, 0 } },
 129         { 1, { 3, 0, 0 } },
 130         { 0, { 0, 0, 0 } },
 131         { 0, { 0, 0, 0 } },
 132         { 0, { 0, 0, 0 } },
 133         { 0, { 0, 0, 0 } },
 134         { 0, { 0, 0, 0 } },
 135         { 1, { 5, 0, 0 } }
 136 },
 137         lowleft[8] = {
 138         { 3, { 7, 0, 1 } },
 139         { 0, { 0, 0, 0 } },
 140         { 0, { 0, 0, 0 } },
 141         { 1, { 1, 0, 0 } },
 142         { 2, { 1, 7, 0 } },
 143         { 1, { 7, 0, 0 } },
 144         { 0, { 0, 0, 0 } },
 145         { 0, { 0, 0, 0 } }
 146 },
 147         lowright[8] = {
 148         { 0, { 0, 0, 0 } },
 149         { 1, { 7, 0, 0 } },
 150         { 2, { 5, 7, 0 } },
 151         { 1, { 5, 0, 0 } },
 152         { 0, { 0, 0, 0 } },
 153         { 0, { 0, 0, 0 } },
 154         { 0, { 0, 0, 0 } },
 155         { 0, { 0, 0, 0 } }
 156 };
 157
 158
 159 static const char       flavor[] = {
 160         'O', '*', '#', '$', '%', '0', '@', '~'
 161 };
 162 static const short      xinc[] = {
 163         1,  1,  1,  0, -1, -1, -1,  0
 164 }, yinc[] = {
 165         -1,  0,  1,  1,  1,  0, -1, -1
 166 };
 167 static struct   worm {
 168         int orientation, head;
 169         short *xpos, *ypos;
 170 } *worm;
 171
 172 volatile sig_atomic_t sig_caught = 0;
 173 void     onsig (int);
 174 void    nomem(void);
 175
 176 int
 177 main(int argc, char **argv)
 178 {
 179         int x, y, h, n;
 180         struct worm *w;
 181         const struct options *op;
 182         short *ip;
 183         int CO, LI, last, bottom, ch, length, number, trail;
 184         short **ref;
 185         const char *field;
 186         char *mp;
 187         unsigned int delay = 0;
 188
 189         mp = NULL;
 190         length = 16;
 191         number = 3;
 192         trail = ' ';
 193         field = NULL;
 194         while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
 195                 switch(ch) {
 196                 case 'd':
 197                         if ((delay = (unsigned int)strtoul(optarg, (char **)NULL, 10)) < 1 || delay > 1000)
 198                                 errx(1, "invalid delay (1-1000)");
 199                         delay *= 1000;  /* ms -> us */
 200                         break;
 201                 case 'f':
 202                         field = "WORM";
 203                         break;
 204                 case 'l':
 205                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 206                                 errx(1, "invalid length (%d - %d).",
 207                                      2, 1024);
 208                         }
 209                         break;
 210                 case 'n':
 211                         if ((number = atoi(optarg)) < 1) {
 212                                 errx(1, "invalid number of worms.");
 213                         }
 214                         break;
 215                 case 't':
 216                         trail = '.';
 217                         break;
 218                 case '?':
 219                 default:
 220                         (void)fprintf(stderr,
 221                             "usage: worms [-ft] [-d delay] [-l length] [-n number]\n");
 222                         exit(1);
 223                 }
 224
 225         if (!(worm = malloc((size_t)number *
 226             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 227                 nomem();
 228         initscr();
 229         CO = COLS;
 230         LI = LINES;
 231         last = CO - 1;
 232         bottom = LI - 1;
 233         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 234                 nomem();
 235         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 236                 nomem();
 237         for (n = 0; n < LI; ++n) {
 238                 ref[n] = ip;
 239                 ip += CO;
 240         }
 241         for (ip = ref[0], n = LI * CO; --n >= 0;)
 242                 *ip++ = 0;
 243         for (n = number, w = &worm[0]; --n >= 0; w++) {
 244                 w->orientation = w->head = 0;
 245                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 246                         nomem();
 247                 w->xpos = ip;
 248                 for (x = length; --x >= 0;)
 249                         *ip++ = -1;
 250                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 251                         nomem();
 252                 w->ypos = ip;
 253                 for (y = length; --y >= 0;)
 254                         *ip++ = -1;
 255         }
 256
 257         (void)signal(SIGHUP, onsig);
 258         (void)signal(SIGINT, onsig);
 259         (void)signal(SIGQUIT, onsig);
 260         (void)signal(SIGSTOP, onsig);
 261         (void)signal(SIGTSTP, onsig);
 262         (void)signal(SIGTERM, onsig);
 263
 264         if (field) {
 265                 const char *p = field;
 266
 267                 for (y = LI; --y >= 0;) {
 268                         for (x = CO; --x >= 0;) {
 269                                 addch(*p++);
 270                                 if (!*p)
 271                                         p = field;
 272                         }
 273                         refresh();
 274                 }
 275         }
 276         for (;;) {
 277                 refresh();
 278                 if (sig_caught) {
 279                         endwin();
 280                         exit(0);
 281                 }
 282                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 283                         if ((x = w->xpos[h = w->head]) < 0) {
 284                                 mvaddch(y = w->ypos[h] = bottom,
 285                                 x = w->xpos[h] = 0,
 286                                 flavor[n % sizeof(flavor)]);
 287                                 ref[y][x]++;
 288                         }
 289                         else
 290                                 y = w->ypos[h];
 291                         if (++h == length)
 292                                 h = 0;
 293                         if (w->xpos[w->head = h] >= 0) {
 294                                 int x1, y1;
 295
 296                                 x1 = w->xpos[h];
 297                                 y1 = w->ypos[h];
 298                                 if (--ref[y1][x1] == 0) {
 299                                         mvaddch(y1, x1, trail);
 300                                 }
 301                         }
 302                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 303                         switch (op->nopts) {
 304                         case 0:
 305                                 refresh();
 306                                 abort();
 307                                 return(1);
 308                         case 1:
 309                                 w->orientation = op->opts[0];
 310                                 break;
 311                         default:
 312                                 w->orientation =
 313                                     op->opts[(int)random() % op->nopts];
 314                         }
 315                         mvaddch(y += yinc[w->orientation],
 316                                 x += xinc[w->orientation],
 317                                 flavor[n % sizeof(flavor)]);
 318                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 319                 }
 320                 if (usleep(delay))
 321                         onsig(SIGTERM);
 322         }
 323 }
 324
 325 void
 326 onsig(__unused int signo)
 327 {
 328         sig_caught = 1;
 329 }
 330
 331 void
 332 nomem(void)
 333 {
 334         errx(1, "not enough memory.");
 335 }