worms/worms.c

   1 /*      $NetBSD: worms.c,v 1.8 1995/04/22 08:09:22 cgd 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 #ifndef lint
  37 static char copyright[] =
  38 "@(#) 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 static char rcsid[] = "$NetBSD: worms.c,v 1.8 1995/04/22 08:09:22 cgd 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 #include <sys/ioctl.h>
  69
  70 #include <signal.h>
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <termios.h>
  74 #include <unistd.h>
  75
  76 static 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 #define cursor(c, r)    tputs(tgoto(CM, c, r), 1, fputchar)
 171
 172 char *tcp;
 173 static char     flavor[] = {
 174         'O', '*', '#', '$', '%', '0', '@', '~'
 175 };
 176 static short    xinc[] = {
 177         1,  1,  1,  0, -1, -1, -1,  0
 178 }, yinc[] = {
 179         -1,  0,  1,  1,  1,  0, -1, -1
 180 };
 181 static struct   worm {
 182         int orientation, head;
 183         short *xpos, *ypos;
 184 } *worm;
 185
 186 void     fputchar __P((int));
 187 void     onsig __P((int));
 188 char    *tgetstr __P((char *, char **));
 189 char    *tgoto __P((char *, int, int));
 190 int      tputs __P((char *, int, void (*)(int)));
 191
 192 int
 193 main(argc, argv)
 194         int argc;
 195         char *argv[];
 196 {
 197         extern int optind;
 198         extern char *optarg, *UP;
 199         register int x, y, h, n;
 200         register struct worm *w;
 201         register struct options *op;
 202         register short *ip;
 203         register char *term;
 204         int CO, IN, LI, last, bottom, ch, length, number, trail, Wrap;
 205         short **ref;
 206         char *AL, *BC, *CM, *EI, *HO, *IC, *IM, *IP, *SR;
 207         char *field, tcb[100], *mp;
 208         long random();
 209         struct termios ti;
 210 #ifdef TIOCGWINSZ
 211         struct winsize ws;
 212 #endif
 213
 214         length = 16;
 215         number = 3;
 216         trail = ' ';
 217         field = NULL;
 218         while ((ch = getopt(argc, argv, "fl:n:t")) != EOF)
 219                 switch(ch) {
 220                 case 'f':
 221                         field = "WORM";
 222                         break;
 223                 case 'l':
 224                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 225                                 (void)fprintf(stderr,
 226                                     "worms: invalid length (%d - %d).\n",
 227                                      2, 1024);
 228                                 exit(1);
 229                         }
 230                         break;
 231                 case 'n':
 232                         if ((number = atoi(optarg)) < 1) {
 233                                 (void)fprintf(stderr,
 234                                     "worms: invalid number of worms.\n");
 235                                 exit(1);
 236                         }
 237                         break;
 238                 case 't':
 239                         trail = '.';
 240                         break;
 241                 case '?':
 242                 default:
 243                         (void)fprintf(stderr,
 244                             "usage: worms [-ft] [-l length] [-n number]\n");
 245                         exit(1);
 246                 }
 247
 248         if (!(term = getenv("TERM"))) {
 249                 (void)fprintf(stderr, "worms: no TERM environment variable.\n");
 250                 exit(1);
 251         }
 252         if (!(worm = malloc((size_t)number *
 253             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 254                 nomem();
 255         if (tgetent(mp, term) <= 0) {
 256                 (void)fprintf(stderr, "worms: %s: unknown terminal type.\n",
 257                     term);
 258                 exit(1);
 259         }
 260         tcp = tcb;
 261         if (!(CM = tgetstr("cm", &tcp))) {
 262                 (void)fprintf(stderr,
 263                     "worms: terminal incapable of cursor motion.\n");
 264                 exit(1);
 265         }
 266         AL = tgetstr("al", &tcp);
 267         BC = tgetflag("bs") ? "\b" : tgetstr("bc", &tcp);
 268         EI = tgetstr("ei", &tcp);
 269         HO = tgetstr("ho", &tcp);
 270         IC = tgetstr("ic", &tcp);
 271         IM = tgetstr("im", &tcp);
 272         IN = tgetflag("in");
 273         IP = tgetstr("ip", &tcp);
 274         SR = tgetstr("sr", &tcp);
 275         UP = tgetstr("up", &tcp);
 276 #ifdef TIOCGWINSZ
 277         if (ioctl(fileno(stdout), TIOCGWINSZ, &ws) != -1 &&
 278             ws.ws_col && ws.ws_row) {
 279                 CO = ws.ws_col;
 280                 LI = ws.ws_row;
 281         } else
 282 #endif
 283         {
 284                 if ((CO = tgetnum("co")) <= 0)
 285                         CO = 80;
 286                 if ((LI = tgetnum("li")) <= 0)
 287                         LI = 24;
 288         }
 289         last = CO - 1;
 290         bottom = LI - 1;
 291         tcgetattr(fileno(stdout), &ti);
 292         Wrap = tgetflag("am");
 293         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 294                 nomem();
 295         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 296                 nomem();
 297         for (n = 0; n < LI; ++n) {
 298                 ref[n] = ip;
 299                 ip += CO;
 300         }
 301         for (ip = ref[0], n = LI * CO; --n >= 0;)
 302                 *ip++ = 0;
 303         if (Wrap)
 304                 ref[bottom][last] = 1;
 305         for (n = number, w = &worm[0]; --n >= 0; w++) {
 306                 w->orientation = w->head = 0;
 307                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 308                         nomem();
 309                 w->xpos = ip;
 310                 for (x = length; --x >= 0;)
 311                         *ip++ = -1;
 312                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 313                         nomem();
 314                 w->ypos = ip;
 315                 for (y = length; --y >= 0;)
 316                         *ip++ = -1;
 317         }
 318
 319         (void)signal(SIGHUP, onsig);
 320         (void)signal(SIGINT, onsig);
 321         (void)signal(SIGQUIT, onsig);
 322         (void)signal(SIGSTOP, onsig);
 323         (void)signal(SIGTSTP, onsig);
 324         (void)signal(SIGTERM, onsig);
 325
 326         tputs(tgetstr("ti", &tcp), 1, fputchar);
 327         tputs(tgetstr("cl", &tcp), 1, fputchar);
 328         if (field) {
 329                 register char *p = field;
 330
 331                 for (y = bottom; --y >= 0;) {
 332                         for (x = CO; --x >= 0;) {
 333                                 fputchar(*p++);
 334                                 if (!*p)
 335                                         p = field;
 336                         }
 337                         if (!Wrap)
 338                                 fputchar('\n');
 339                         (void)fflush(stdout);
 340                 }
 341                 if (Wrap) {
 342                         if (IM && !IN) {
 343                                 for (x = last; --x > 0;) {
 344                                         fputchar(*p++);
 345                                         if (!*p)
 346                                                 p = field;
 347                                 }
 348                                 y = *p++;
 349                                 if (!*p)
 350                                         p = field;
 351                                 fputchar(*p);
 352                                 if (BC)
 353                                         tputs(BC, 1, fputchar);
 354                                 else
 355                                         cursor(last - 1, bottom);
 356                                 tputs(IM, 1, fputchar);
 357                                 if (IC)
 358                                         tputs(IC, 1, fputchar);
 359                                 fputchar(y);
 360                                 if (IP)
 361                                         tputs(IP, 1, fputchar);
 362                                 tputs(EI, 1, fputchar);
 363                         }
 364                         else if (SR || AL) {
 365                                 if (HO)
 366                                         tputs(HO, 1, fputchar);
 367                                 else
 368                                         cursor(0, 0);
 369                                 if (SR)
 370                                         tputs(SR, 1, fputchar);
 371                                 else
 372                                         tputs(AL, LI, fputchar);
 373                                 for (x = CO; --x >= 0;) {
 374                                         fputchar(*p++);
 375                                         if (!*p)
 376                                                 p = field;
 377                                 }
 378                         }
 379                         else for (x = last; --x >= 0;) {
 380                                 fputchar(*p++);
 381                                 if (!*p)
 382                                         p = field;
 383                         }
 384                 }
 385                 else for (x = CO; --x >= 0;) {
 386                         fputchar(*p++);
 387                         if (!*p)
 388                                 p = field;
 389                 }
 390         }
 391         for (;;) {
 392                 (void)fflush(stdout);
 393                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 394                         if ((x = w->xpos[h = w->head]) < 0) {
 395                                 cursor(x = w->xpos[h] = 0,
 396                                      y = w->ypos[h] = bottom);
 397                                 fputchar(flavor[n % sizeof(flavor)]);
 398                                 ref[y][x]++;
 399                         }
 400                         else
 401                                 y = w->ypos[h];
 402                         if (++h == length)
 403                                 h = 0;
 404                         if (w->xpos[w->head = h] >= 0) {
 405                                 register int x1, y1;
 406
 407                                 x1 = w->xpos[h];
 408                                 y1 = w->ypos[h];
 409                                 if (--ref[y1][x1] == 0) {
 410                                         cursor(x1, y1);
 411                                         if (trail)
 412                                                 fputchar(trail);
 413                                 }
 414                         }
 415                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 416                         switch (op->nopts) {
 417                         case 0:
 418                                 (void)fflush(stdout);
 419                                 abort();
 420                                 return;
 421                         case 1:
 422                                 w->orientation = op->opts[0];
 423                                 break;
 424                         default:
 425                                 w->orientation =
 426                                     op->opts[(int)random() % op->nopts];
 427                         }
 428                         cursor(x += xinc[w->orientation],
 429                             y += yinc[w->orientation]);
 430                         if (!Wrap || x != last || y != bottom)
 431                                 fputchar(flavor[n % sizeof(flavor)]);
 432                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 433                 }
 434         }
 435 }
 436
 437 void
 438 onsig(signo)
 439         int signo;
 440 {
 441         tputs(tgetstr("cl", &tcp), 1, fputchar);
 442         tputs(tgetstr("te", &tcp), 1, fputchar);
 443         exit(0);
 444 }
 445
 446 void
 447 fputchar(c)
 448         int c;
 449 {
 450         (void)putchar(c);
 451 }
 452
 453 nomem()
 454 {
 455         (void)fprintf(stderr, "worms: not enough memory.\n");
 456         exit(1);
 457 }