worms/worms.c

   1 /*      $NetBSD: worms.c,v 1.10 1998/09/13 15:27:31 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 1.10 1998/09/13 15:27:31 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 #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 int      main __P((int, char **));
 188 void     nomem __P((void)) __attribute__((__noreturn__));
 189 void     onsig __P((int)) __attribute__((__noreturn__));
 190 int      tgetent __P((char *, char *));
 191 int      tgetflag __P((char *));
 192 int      tgetnum __P((char *));
 193 char    *tgetstr __P((char *, char **));
 194 char    *tgoto __P((char *, int, int));
 195 int      tputs __P((char *, int, void (*)(int)));
 196
 197 int
 198 main(argc, argv)
 199         int argc;
 200         char *argv[];
 201 {
 202         extern char *UP;
 203         int x, y, h, n;
 204         struct worm *w;
 205         struct options *op;
 206         short *ip;
 207         char *term;
 208         int CO, IN, LI, last, bottom, ch, length, number, trail, Wrap;
 209         short **ref;
 210         char *AL, *BC, *CM, *EI, *HO, *IC, *IM, *IP, *SR;
 211         char *field, tcb[100], *mp;
 212         struct termios ti;
 213 #ifdef TIOCGWINSZ
 214         struct winsize ws;
 215 #endif
 216
 217         mp = NULL;
 218         length = 16;
 219         number = 3;
 220         trail = ' ';
 221         field = NULL;
 222         while ((ch = getopt(argc, argv, "fl:n:t")) != -1)
 223                 switch(ch) {
 224                 case 'f':
 225                         field = "WORM";
 226                         break;
 227                 case 'l':
 228                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 229                                 (void)fprintf(stderr,
 230                                     "worms: invalid length (%d - %d).\n",
 231                                      2, 1024);
 232                                 exit(1);
 233                         }
 234                         break;
 235                 case 'n':
 236                         if ((number = atoi(optarg)) < 1) {
 237                                 (void)fprintf(stderr,
 238                                     "worms: invalid number of worms.\n");
 239                                 exit(1);
 240                         }
 241                         break;
 242                 case 't':
 243                         trail = '.';
 244                         break;
 245                 case '?':
 246                 default:
 247                         (void)fprintf(stderr,
 248                             "usage: worms [-ft] [-l length] [-n number]\n");
 249                         exit(1);
 250                 }
 251
 252         if (!(term = getenv("TERM"))) {
 253                 (void)fprintf(stderr, "worms: no TERM environment variable.\n");
 254                 exit(1);
 255         }
 256         if (!(worm = malloc((size_t)number *
 257             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 258                 nomem();
 259         if (tgetent(mp, term) <= 0) {
 260                 (void)fprintf(stderr, "worms: %s: unknown terminal type.\n",
 261                     term);
 262                 exit(1);
 263         }
 264         tcp = tcb;
 265         if (!(CM = tgetstr("cm", &tcp))) {
 266                 (void)fprintf(stderr,
 267                     "worms: terminal incapable of cursor motion.\n");
 268                 exit(1);
 269         }
 270         AL = tgetstr("al", &tcp);
 271         BC = tgetflag("bs") ? "\b" : tgetstr("bc", &tcp);
 272         EI = tgetstr("ei", &tcp);
 273         HO = tgetstr("ho", &tcp);
 274         IC = tgetstr("ic", &tcp);
 275         IM = tgetstr("im", &tcp);
 276         IN = tgetflag("in");
 277         IP = tgetstr("ip", &tcp);
 278         SR = tgetstr("sr", &tcp);
 279         UP = tgetstr("up", &tcp);
 280 #ifdef TIOCGWINSZ
 281         if (ioctl(fileno(stdout), TIOCGWINSZ, &ws) != -1 &&
 282             ws.ws_col && ws.ws_row) {
 283                 CO = ws.ws_col;
 284                 LI = ws.ws_row;
 285         } else
 286 #endif
 287         {
 288                 if ((CO = tgetnum("co")) <= 0)
 289                         CO = 80;
 290                 if ((LI = tgetnum("li")) <= 0)
 291                         LI = 24;
 292         }
 293         last = CO - 1;
 294         bottom = LI - 1;
 295         tcgetattr(fileno(stdout), &ti);
 296         Wrap = tgetflag("am");
 297         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 298                 nomem();
 299         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 300                 nomem();
 301         for (n = 0; n < LI; ++n) {
 302                 ref[n] = ip;
 303                 ip += CO;
 304         }
 305         for (ip = ref[0], n = LI * CO; --n >= 0;)
 306                 *ip++ = 0;
 307         if (Wrap)
 308                 ref[bottom][last] = 1;
 309         for (n = number, w = &worm[0]; --n >= 0; w++) {
 310                 w->orientation = w->head = 0;
 311                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 312                         nomem();
 313                 w->xpos = ip;
 314                 for (x = length; --x >= 0;)
 315                         *ip++ = -1;
 316                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 317                         nomem();
 318                 w->ypos = ip;
 319                 for (y = length; --y >= 0;)
 320                         *ip++ = -1;
 321         }
 322
 323         (void)signal(SIGHUP, onsig);
 324         (void)signal(SIGINT, onsig);
 325         (void)signal(SIGQUIT, onsig);
 326         (void)signal(SIGSTOP, onsig);
 327         (void)signal(SIGTSTP, onsig);
 328         (void)signal(SIGTERM, onsig);
 329
 330         tputs(tgetstr("ti", &tcp), 1, fputchar);
 331         tputs(tgetstr("cl", &tcp), 1, fputchar);
 332         if (field) {
 333                 char *p = field;
 334
 335                 for (y = bottom; --y >= 0;) {
 336                         for (x = CO; --x >= 0;) {
 337                                 fputchar(*p++);
 338                                 if (!*p)
 339                                         p = field;
 340                         }
 341                         if (!Wrap)
 342                                 fputchar('\n');
 343                         (void)fflush(stdout);
 344                 }
 345                 if (Wrap) {
 346                         if (IM && !IN) {
 347                                 for (x = last; --x > 0;) {
 348                                         fputchar(*p++);
 349                                         if (!*p)
 350                                                 p = field;
 351                                 }
 352                                 y = *p++;
 353                                 if (!*p)
 354                                         p = field;
 355                                 fputchar(*p);
 356                                 if (BC)
 357                                         tputs(BC, 1, fputchar);
 358                                 else
 359                                         cursor(last - 1, bottom);
 360                                 tputs(IM, 1, fputchar);
 361                                 if (IC)
 362                                         tputs(IC, 1, fputchar);
 363                                 fputchar(y);
 364                                 if (IP)
 365                                         tputs(IP, 1, fputchar);
 366                                 tputs(EI, 1, fputchar);
 367                         }
 368                         else if (SR || AL) {
 369                                 if (HO)
 370                                         tputs(HO, 1, fputchar);
 371                                 else
 372                                         cursor(0, 0);
 373                                 if (SR)
 374                                         tputs(SR, 1, fputchar);
 375                                 else
 376                                         tputs(AL, LI, fputchar);
 377                                 for (x = CO; --x >= 0;) {
 378                                         fputchar(*p++);
 379                                         if (!*p)
 380                                                 p = field;
 381                                 }
 382                         }
 383                         else for (x = last; --x >= 0;) {
 384                                 fputchar(*p++);
 385                                 if (!*p)
 386                                         p = field;
 387                         }
 388                 }
 389                 else for (x = CO; --x >= 0;) {
 390                         fputchar(*p++);
 391                         if (!*p)
 392                                 p = field;
 393                 }
 394         }
 395         for (;;) {
 396                 (void)fflush(stdout);
 397                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 398                         if ((x = w->xpos[h = w->head]) < 0) {
 399                                 cursor(x = w->xpos[h] = 0,
 400                                      y = w->ypos[h] = bottom);
 401                                 fputchar(flavor[n % sizeof(flavor)]);
 402                                 ref[y][x]++;
 403                         }
 404                         else
 405                                 y = w->ypos[h];
 406                         if (++h == length)
 407                                 h = 0;
 408                         if (w->xpos[w->head = h] >= 0) {
 409                                 int x1, y1;
 410
 411                                 x1 = w->xpos[h];
 412                                 y1 = w->ypos[h];
 413                                 if (--ref[y1][x1] == 0) {
 414                                         cursor(x1, y1);
 415                                         if (trail)
 416                                                 fputchar(trail);
 417                                 }
 418                         }
 419                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 420                         switch (op->nopts) {
 421                         case 0:
 422                                 (void)fflush(stdout);
 423                                 abort();
 424                                 return(1);
 425                         case 1:
 426                                 w->orientation = op->opts[0];
 427                                 break;
 428                         default:
 429                                 w->orientation =
 430                                     op->opts[(int)random() % op->nopts];
 431                         }
 432                         cursor(x += xinc[w->orientation],
 433                             y += yinc[w->orientation]);
 434                         if (!Wrap || x != last || y != bottom)
 435                                 fputchar(flavor[n % sizeof(flavor)]);
 436                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 437                 }
 438         }
 439 }
 440
 441 void
 442 onsig(signo)
 443         int signo;
 444 {
 445         tputs(tgetstr("cl", &tcp), 1, fputchar);
 446         tputs(tgetstr("te", &tcp), 1, fputchar);
 447         exit(0);
 448 }
 449
 450 void
 451 fputchar(c)
 452         int c;
 453 {
 454         (void)putchar(c);
 455 }
 456
 457 void
 458 nomem()
 459 {
 460         (void)fprintf(stderr, "worms: not enough memory.\n");
 461         exit(1);
 462 }