worms/worms.c

   1 /*      $NetBSD: worms.c,v 1.11 1999/07/30 02:23:27 hubertf 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 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) 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[] = "@(#)worms.c     8.1 (Berkeley) 5/31/93";
  45 #else
  46 __RCSID("$NetBSD: worms.c,v 1.11 1999/07/30 02:23:27 hubertf Exp $");
  47 #endif
  48 #endif /* not lint */
  49
  50 /*
  51  *
  52  *       @@@        @@@    @@@@@@@@@@     @@@@@@@@@@@    @@@@@@@@@@@@
  53  *       @@@        @@@   @@@@@@@@@@@@    @@@@@@@@@@@@   @@@@@@@@@@@@@
  54  *       @@@        @@@  @@@@      @@@@   @@@@           @@@@ @@@  @@@@
  55  *       @@@   @@   @@@  @@@        @@@   @@@            @@@  @@@   @@@
  56  *       @@@  @@@@  @@@  @@@        @@@   @@@            @@@  @@@   @@@
  57  *       @@@@ @@@@ @@@@  @@@        @@@   @@@            @@@  @@@   @@@
  58  *        @@@@@@@@@@@@   @@@@      @@@@   @@@            @@@  @@@   @@@
  59  *         @@@@  @@@@     @@@@@@@@@@@@    @@@            @@@  @@@   @@@
  60  *          @@    @@       @@@@@@@@@@     @@@            @@@  @@@   @@@
  61  *
  62  *                               Eric P. Scott
  63  *                        Caltech High Energy Physics
  64  *                               October, 1980
  65  *
  66  */
  67 #include <sys/types.h>
  68
  69 #include <curses.h>
  70 #include <err.h>
  71 #include <signal.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <unistd.h>
  75
  76 static const struct options {
  77         int nopts;
  78         int opts[3];
  79 }
  80         normal[8] = {
  81         { 3, { 7, 0, 1 } },
  82         { 3, { 0, 1, 2 } },
  83         { 3, { 1, 2, 3 } },
  84         { 3, { 2, 3, 4 } },
  85         { 3, { 3, 4, 5 } },
  86         { 3, { 4, 5, 6 } },
  87         { 3, { 5, 6, 7 } },
  88         { 3, { 6, 7, 0 } }
  89 },      upper[8] = {
  90         { 1, { 1, 0, 0 } },
  91         { 2, { 1, 2, 0 } },
  92         { 0, { 0, 0, 0 } },
  93         { 0, { 0, 0, 0 } },
  94         { 0, { 0, 0, 0 } },
  95         { 2, { 4, 5, 0 } },
  96         { 1, { 5, 0, 0 } },
  97         { 2, { 1, 5, 0 } }
  98 },
  99         left[8] = {
 100         { 0, { 0, 0, 0 } },
 101         { 0, { 0, 0, 0 } },
 102         { 0, { 0, 0, 0 } },
 103         { 2, { 2, 3, 0 } },
 104         { 1, { 3, 0, 0 } },
 105         { 2, { 3, 7, 0 } },
 106         { 1, { 7, 0, 0 } },
 107         { 2, { 7, 0, 0 } }
 108 },
 109         right[8] = {
 110         { 1, { 7, 0, 0 } },
 111         { 2, { 3, 7, 0 } },
 112         { 1, { 3, 0, 0 } },
 113         { 2, { 3, 4, 0 } },
 114         { 0, { 0, 0, 0 } },
 115         { 0, { 0, 0, 0 } },
 116         { 0, { 0, 0, 0 } },
 117         { 2, { 6, 7, 0 } }
 118 },
 119         lower[8] = {
 120         { 0, { 0, 0, 0 } },
 121         { 2, { 0, 1, 0 } },
 122         { 1, { 1, 0, 0 } },
 123         { 2, { 1, 5, 0 } },
 124         { 1, { 5, 0, 0 } },
 125         { 2, { 5, 6, 0 } },
 126         { 0, { 0, 0, 0 } },
 127         { 0, { 0, 0, 0 } }
 128 },
 129         upleft[8] = {
 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, { 3, 0, 0 } },
 136         { 2, { 1, 3, 0 } },
 137         { 1, { 1, 0, 0 } }
 138 },
 139         upright[8] = {
 140         { 2, { 3, 5, 0 } },
 141         { 1, { 3, 0, 0 } },
 142         { 0, { 0, 0, 0 } },
 143         { 0, { 0, 0, 0 } },
 144         { 0, { 0, 0, 0 } },
 145         { 0, { 0, 0, 0 } },
 146         { 0, { 0, 0, 0 } },
 147         { 1, { 5, 0, 0 } }
 148 },
 149         lowleft[8] = {
 150         { 3, { 7, 0, 1 } },
 151         { 0, { 0, 0, 0 } },
 152         { 0, { 0, 0, 0 } },
 153         { 1, { 1, 0, 0 } },
 154         { 2, { 1, 7, 0 } },
 155         { 1, { 7, 0, 0 } },
 156         { 0, { 0, 0, 0 } },
 157         { 0, { 0, 0, 0 } }
 158 },
 159         lowright[8] = {
 160         { 0, { 0, 0, 0 } },
 161         { 1, { 7, 0, 0 } },
 162         { 2, { 5, 7, 0 } },
 163         { 1, { 5, 0, 0 } },
 164         { 0, { 0, 0, 0 } },
 165         { 0, { 0, 0, 0 } },
 166         { 0, { 0, 0, 0 } },
 167         { 0, { 0, 0, 0 } }
 168 };
 169
 170
 171 static const char       flavor[] = {
 172         'O', '*', '#', '$', '%', '0', '@', '~'
 173 };
 174 static const short      xinc[] = {
 175         1,  1,  1,  0, -1, -1, -1,  0
 176 }, yinc[] = {
 177         -1,  0,  1,  1,  1,  0, -1, -1
 178 };
 179 static struct   worm {
 180         int orientation, head;
 181         short *xpos, *ypos;
 182 } *worm;
 183
 184 volatile sig_atomic_t sig_caught = 0;
 185
 186 int      main __P((int, char **));
 187 void     nomem __P((void)) __attribute__((__noreturn__));
 188 void     onsig __P((int));
 189
 190 int
 191 main(argc, argv)
 192         int argc;
 193         char *argv[];
 194 {
 195         int x, y, h, n;
 196         struct worm *w;
 197         const struct options *op;
 198         short *ip;
 199         int CO, LI, last, bottom, ch, length, number, trail;
 200         short **ref;
 201         const char *field;
 202         char *mp;
 203         unsigned int delay = 0;
 204
 205         mp = NULL;
 206         length = 16;
 207         number = 3;
 208         trail = ' ';
 209         field = NULL;
 210         while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
 211                 switch(ch) {
 212                 case 'd':
 213                         if ((delay = (unsigned int)strtoul(optarg, (char **)NULL, 10)) < 1 || delay > 1000)
 214                                 errx(1, "invalid delay (1-1000)");
 215                         delay *= 1000;  /* ms -> us */
 216                         break;
 217                 case 'f':
 218                         field = "WORM";
 219                         break;
 220                 case 'l':
 221                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 222                                 errx(1, "invalid length (%d - %d).",
 223                                      2, 1024);
 224                         }
 225                         break;
 226                 case 'n':
 227                         if ((number = atoi(optarg)) < 1) {
 228                                 errx(1, "invalid number of worms.");
 229                         }
 230                         break;
 231                 case 't':
 232                         trail = '.';
 233                         break;
 234                 case '?':
 235                 default:
 236                         (void)fprintf(stderr,
 237                             "usage: worms [-ft] [-d delay] [-l length] [-n number]\n");
 238                         exit(1);
 239                 }
 240
 241         if (!(worm = malloc((size_t)number *
 242             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 243                 nomem();
 244         initscr();
 245         CO = COLS;
 246         LI = LINES;
 247         last = CO - 1;
 248         bottom = LI - 1;
 249         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 250                 nomem();
 251         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 252                 nomem();
 253         for (n = 0; n < LI; ++n) {
 254                 ref[n] = ip;
 255                 ip += CO;
 256         }
 257         for (ip = ref[0], n = LI * CO; --n >= 0;)
 258                 *ip++ = 0;
 259         for (n = number, w = &worm[0]; --n >= 0; w++) {
 260                 w->orientation = w->head = 0;
 261                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 262                         nomem();
 263                 w->xpos = ip;
 264                 for (x = length; --x >= 0;)
 265                         *ip++ = -1;
 266                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 267                         nomem();
 268                 w->ypos = ip;
 269                 for (y = length; --y >= 0;)
 270                         *ip++ = -1;
 271         }
 272
 273         (void)signal(SIGHUP, onsig);
 274         (void)signal(SIGINT, onsig);
 275         (void)signal(SIGQUIT, onsig);
 276         (void)signal(SIGSTOP, onsig);
 277         (void)signal(SIGTSTP, onsig);
 278         (void)signal(SIGTERM, onsig);
 279
 280         if (field) {
 281                 const char *p = field;
 282
 283                 for (y = LI; --y >= 0;) {
 284                         for (x = CO; --x >= 0;) {
 285                                 addch(*p++);
 286                                 if (!*p)
 287                                         p = field;
 288                         }
 289                         refresh();
 290                 }
 291         }
 292         for (;;) {
 293                 refresh();
 294                 if (sig_caught) {
 295                         endwin();
 296                         exit(0);
 297                 }
 298                 if (delay) usleep(delay);
 299                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 300                         if ((x = w->xpos[h = w->head]) < 0) {
 301                                 mvaddch(y = w->ypos[h] = bottom,
 302                                         x = w->xpos[h] = 0,
 303                                         flavor[n % sizeof(flavor)]);
 304                                 ref[y][x]++;
 305                         }
 306                         else
 307                                 y = w->ypos[h];
 308                         if (++h == length)
 309                                 h = 0;
 310                         if (w->xpos[w->head = h] >= 0) {
 311                                 int x1, y1;
 312
 313                                 x1 = w->xpos[h];
 314                                 y1 = w->ypos[h];
 315                                 if (--ref[y1][x1] == 0) {
 316                                         mvaddch(y1, x1, trail);
 317                                 }
 318                         }
 319                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 320                         switch (op->nopts) {
 321                         case 0:
 322                                 refresh();
 323                                 abort();
 324                                 return(1);
 325                         case 1:
 326                                 w->orientation = op->opts[0];
 327                                 break;
 328                         default:
 329                                 w->orientation =
 330                                     op->opts[(int)random() % op->nopts];
 331                         }
 332                         mvaddch(y += yinc[w->orientation],
 333                                 x += xinc[w->orientation],
 334                                 flavor[n % sizeof(flavor)]);
 335                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 336                 }
 337         }
 338 }
 339
 340 void
 341 onsig(signo)
 342         int signo __attribute__((__unused__));
 343 {
 344         sig_caught = 1;
 345 }
 346
 347 void
 348 nomem()
 349 {
 350         errx(1, "not enough memory.");
 351 }