worms/worms.c

   1 /*      $NetBSD: worms.c,v 1.6 1995/04/22 08:00:58 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 1.6 1995/04/22 08:00:58 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
  69 #include <signal.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <unistd.h>
  73
  74 static struct options {
  75         int nopts;
  76         int opts[3];
  77 }
  78         normal[8] = {
  79         { 3, { 7, 0, 1 } },
  80         { 3, { 0, 1, 2 } },
  81         { 3, { 1, 2, 3 } },
  82         { 3, { 2, 3, 4 } },
  83         { 3, { 3, 4, 5 } },
  84         { 3, { 4, 5, 6 } },
  85         { 3, { 5, 6, 7 } },
  86         { 3, { 6, 7, 0 } }
  87 },      upper[8] = {
  88         { 1, { 1, 0, 0 } },
  89         { 2, { 1, 2, 0 } },
  90         { 0, { 0, 0, 0 } },
  91         { 0, { 0, 0, 0 } },
  92         { 0, { 0, 0, 0 } },
  93         { 2, { 4, 5, 0 } },
  94         { 1, { 5, 0, 0 } },
  95         { 2, { 1, 5, 0 } }
  96 },
  97         left[8] = {
  98         { 0, { 0, 0, 0 } },
  99         { 0, { 0, 0, 0 } },
 100         { 0, { 0, 0, 0 } },
 101         { 2, { 2, 3, 0 } },
 102         { 1, { 3, 0, 0 } },
 103         { 2, { 3, 7, 0 } },
 104         { 1, { 7, 0, 0 } },
 105         { 2, { 7, 0, 0 } }
 106 },
 107         right[8] = {
 108         { 1, { 7, 0, 0 } },
 109         { 2, { 3, 7, 0 } },
 110         { 1, { 3, 0, 0 } },
 111         { 2, { 3, 4, 0 } },
 112         { 0, { 0, 0, 0 } },
 113         { 0, { 0, 0, 0 } },
 114         { 0, { 0, 0, 0 } },
 115         { 2, { 6, 7, 0 } }
 116 },
 117         lower[8] = {
 118         { 0, { 0, 0, 0 } },
 119         { 2, { 0, 1, 0 } },
 120         { 1, { 1, 0, 0 } },
 121         { 2, { 1, 5, 0 } },
 122         { 1, { 5, 0, 0 } },
 123         { 2, { 5, 6, 0 } },
 124         { 0, { 0, 0, 0 } },
 125         { 0, { 0, 0, 0 } }
 126 },
 127         upleft[8] = {
 128         { 0, { 0, 0, 0 } },
 129         { 0, { 0, 0, 0 } },
 130         { 0, { 0, 0, 0 } },
 131         { 0, { 0, 0, 0 } },
 132         { 0, { 0, 0, 0 } },
 133         { 1, { 3, 0, 0 } },
 134         { 2, { 1, 3, 0 } },
 135         { 1, { 1, 0, 0 } }
 136 },
 137         upright[8] = {
 138         { 2, { 3, 5, 0 } },
 139         { 1, { 3, 0, 0 } },
 140         { 0, { 0, 0, 0 } },
 141         { 0, { 0, 0, 0 } },
 142         { 0, { 0, 0, 0 } },
 143         { 0, { 0, 0, 0 } },
 144         { 0, { 0, 0, 0 } },
 145         { 1, { 5, 0, 0 } }
 146 },
 147         lowleft[8] = {
 148         { 3, { 7, 0, 1 } },
 149         { 0, { 0, 0, 0 } },
 150         { 0, { 0, 0, 0 } },
 151         { 1, { 1, 0, 0 } },
 152         { 2, { 1, 7, 0 } },
 153         { 1, { 7, 0, 0 } },
 154         { 0, { 0, 0, 0 } },
 155         { 0, { 0, 0, 0 } }
 156 },
 157         lowright[8] = {
 158         { 0, { 0, 0, 0 } },
 159         { 1, { 7, 0, 0 } },
 160         { 2, { 5, 7, 0 } },
 161         { 1, { 5, 0, 0 } },
 162         { 0, { 0, 0, 0 } },
 163         { 0, { 0, 0, 0 } },
 164         { 0, { 0, 0, 0 } },
 165         { 0, { 0, 0, 0 } }
 166 };
 167
 168 #define cursor(c, r)    tputs(tgoto(CM, c, r), 1, putchar)
 169
 170 char *tcp;
 171 static char     flavor[] = {
 172         'O', '*', '#', '$', '%', '0', '@', '~'
 173 };
 174 static 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 void     fputchar __P((int));
 185 void     onsig __P((int));
 186 char    *tgetstr __P((char *, char **));
 187 char    *tgoto __P((char *, int, int));
 188 int      tputs __P((char *, int, void (*)(int)));
 189
 190 int
 191 main(argc, argv)
 192         int argc;
 193         char *argv[];
 194 {
 195         extern int optind;
 196         extern char *optarg, *UP;
 197         register int x, y, h, n;
 198         register struct worm *w;
 199         register struct options *op;
 200         register short *ip;
 201         register char *term;
 202         int CO, IN, LI, last, bottom, ch, length, number, trail, Wrap;
 203         short **ref;
 204         char *AL, *BC, *CM, *EI, *HO, *IC, *IM, *IP, *SR;
 205         char *field, tcb[100], *mp;
 206         long random();
 207
 208         length = 16;
 209         number = 3;
 210         trail = ' ';
 211         field = NULL;
 212         while ((ch = getopt(argc, argv, "fl:n:t")) != EOF)
 213                 switch(ch) {
 214                 case 'f':
 215                         field = "WORM";
 216                         break;
 217                 case 'l':
 218                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 219                                 (void)fprintf(stderr,
 220                                     "worms: invalid length (%d - %d).\n",
 221                                      2, 1024);
 222                                 exit(1);
 223                         }
 224                         break;
 225                 case 'n':
 226                         if ((number = atoi(optarg)) < 1) {
 227                                 (void)fprintf(stderr,
 228                                     "worms: invalid number of worms.\n");
 229                                 exit(1);
 230                         }
 231                         break;
 232                 case 't':
 233                         trail = '.';
 234                         break;
 235                 case '?':
 236                 default:
 237                         (void)fprintf(stderr,
 238                             "usage: worms [-ft] [-l length] [-n number]\n");
 239                         exit(1);
 240                 }
 241
 242         if (!(term = getenv("TERM"))) {
 243                 (void)fprintf(stderr, "worms: no TERM environment variable.\n");
 244                 exit(1);
 245         }
 246         if (!(worm = malloc((size_t)number *
 247             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 248                 nomem();
 249         if (tgetent(mp, term) <= 0) {
 250                 (void)fprintf(stderr, "worms: %s: unknown terminal type.\n",
 251                     term);
 252                 exit(1);
 253         }
 254         tcp = tcb;
 255         if (!(CM = tgetstr("cm", &tcp))) {
 256                 (void)fprintf(stderr,
 257                     "worms: terminal incapable of cursor motion.\n");
 258                 exit(1);
 259         }
 260         AL = tgetstr("al", &tcp);
 261         BC = tgetflag("bs") ? "\b" : tgetstr("bc", &tcp);
 262         EI = tgetstr("ei", &tcp);
 263         HO = tgetstr("ho", &tcp);
 264         IC = tgetstr("ic", &tcp);
 265         IM = tgetstr("im", &tcp);
 266         IN = tgetflag("in");
 267         IP = tgetstr("ip", &tcp);
 268         SR = tgetstr("sr", &tcp);
 269         UP = tgetstr("up", &tcp);
 270 #ifdef TIOCGWINSZ
 271         if (ioctl(fileno(stdout), TIOCGWINSZ, &ws) != -1 &&
 272             ws.ws_col && ws.ws_row) {
 273                 CO = ws.ws_col;
 274                 LI = ws.ws_row;
 275         } else
 276 #endif
 277         {
 278                 if ((CO = tgetnum("co")) <= 0)
 279                         CO = 80;
 280                 if ((LI = tgetnum("li")) <= 0)
 281                         LI = 24;
 282         }
 283         last = CO - 1;
 284         bottom = LI - 1;
 285         tcgetattr(fileno(stdout), &ti);
 286         Wrap = tgetflag("am");
 287         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 288                 nomem();
 289         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 290                 nomem();
 291         for (n = 0; n < LI; ++n) {
 292                 ref[n] = ip;
 293                 ip += CO;
 294         }
 295         for (ip = ref[0], n = LI * CO; --n >= 0;)
 296                 *ip++ = 0;
 297         if (Wrap)
 298                 ref[bottom][last] = 1;
 299         for (n = number, w = &worm[0]; --n >= 0; w++) {
 300                 w->orientation = w->head = 0;
 301                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 302                         nomem();
 303                 w->xpos = ip;
 304                 for (x = length; --x >= 0;)
 305                         *ip++ = -1;
 306                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 307                         nomem();
 308                 w->ypos = ip;
 309                 for (y = length; --y >= 0;)
 310                         *ip++ = -1;
 311         }
 312
 313         (void)signal(SIGHUP, onsig);
 314         (void)signal(SIGINT, onsig);
 315         (void)signal(SIGQUIT, onsig);
 316         (void)signal(SIGSTOP, onsig);
 317         (void)signal(SIGTSTP, onsig);
 318         (void)signal(SIGTERM, onsig);
 319
 320         tputs(tgetstr("ti", &tcp), 1, putchar);
 321         tputs(tgetstr("cl", &tcp), 1, putchar);
 322         if (field) {
 323                 register char *p = field;
 324
 325                 for (y = bottom; --y >= 0;) {
 326                         for (x = CO; --x >= 0;) {
 327                                 putchar(*p++);
 328                                 if (!*p)
 329                                         p = field;
 330                         }
 331                         if (!Wrap)
 332                                 putchar('\n');
 333                         (void)fflush(stdout);
 334                 }
 335                 if (Wrap) {
 336                         if (IM && !IN) {
 337                                 for (x = last; --x > 0;) {
 338                                         putchar(*p++);
 339                                         if (!*p)
 340                                                 p = field;
 341                                 }
 342                                 y = *p++;
 343                                 if (!*p)
 344                                         p = field;
 345                                 putchar(*p);
 346                                 if (BC)
 347                                         tputs(BC, 1, putchar);
 348                                 else
 349                                         cursor(last - 1, bottom);
 350                                 tputs(IM, 1, putchar);
 351                                 if (IC)
 352                                         tputs(IC, 1, putchar);
 353                                 putchar(y);
 354                                 if (IP)
 355                                         tputs(IP, 1, putchar);
 356                                 tputs(EI, 1, putchar);
 357                         }
 358                         else if (SR || AL) {
 359                                 if (HO)
 360                                         tputs(HO, 1, putchar);
 361                                 else
 362                                         cursor(0, 0);
 363                                 if (SR)
 364                                         tputs(SR, 1, putchar);
 365                                 else
 366                                         tputs(AL, LI, putchar);
 367                                 for (x = CO; --x >= 0;) {
 368                                         putchar(*p++);
 369                                         if (!*p)
 370                                                 p = field;
 371                                 }
 372                         }
 373                         else for (x = last; --x >= 0;) {
 374                                 putchar(*p++);
 375                                 if (!*p)
 376                                         p = field;
 377                         }
 378                 }
 379                 else for (x = CO; --x >= 0;) {
 380                         putchar(*p++);
 381                         if (!*p)
 382                                 p = field;
 383                 }
 384         }
 385         for (;;) {
 386                 (void)fflush(stdout);
 387                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 388                         if ((x = w->xpos[h = w->head]) < 0) {
 389                                 cursor(x = w->xpos[h] = 0,
 390                                      y = w->ypos[h] = bottom);
 391                                 putchar(flavor[n % sizeof(flavor)]);
 392                                 ref[y][x]++;
 393                         }
 394                         else
 395                                 y = w->ypos[h];
 396                         if (++h == length)
 397                                 h = 0;
 398                         if (w->xpos[w->head = h] >= 0) {
 399                                 register int x1, y1;
 400
 401                                 x1 = w->xpos[h];
 402                                 y1 = w->ypos[h];
 403                                 if (--ref[y1][x1] == 0) {
 404                                         cursor(x1, y1);
 405                                         if (trail)
 406                                                 putchar(trail);
 407                                 }
 408                         }
 409                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 410                         switch (op->nopts) {
 411                         case 0:
 412                                 (void)fflush(stdout);
 413                                 abort();
 414                                 return;
 415                         case 1:
 416                                 w->orientation = op->opts[0];
 417                                 break;
 418                         default:
 419                                 w->orientation =
 420                                     op->opts[(int)random() % op->nopts];
 421                         }
 422                         cursor(x += xinc[w->orientation],
 423                             y += yinc[w->orientation]);
 424                         if (!Wrap || x != last || y != bottom)
 425                                 putchar(flavor[n % sizeof(flavor)]);
 426                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 427                 }
 428         }
 429 }
 430
 431 void
 432 onsig(signo)
 433         int signo;
 434 {
 435         tputs(tgetstr("cl", &tcp), 1, putchar);
 436         tputs(tgetstr("te", &tcp), 1, putchar);
 437         exit(0);
 438 }
 439
 440 void
 441 fputchar(c)
 442         int c;
 443 {
 444         (void)putchar(c);
 445 }
 446
 447 nomem()
 448 {
 449         (void)fprintf(stderr, "worms: not enough memory.\n");
 450         exit(1);
 451 }