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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)worms.c  8.1 (Berkeley) 5/31/93
  31  * $FreeBSD: src/games/worms/worms.c,v 1.8.2.1 2000/12/04 10:36:17 alex Exp $
  32  */
  33
  34 /*
  35  *
  36  *       @@@        @@@    @@@@@@@@@@     @@@@@@@@@@@    @@@@@@@@@@@@
  37  *       @@@        @@@   @@@@@@@@@@@@    @@@@@@@@@@@@   @@@@@@@@@@@@@
  38  *       @@@        @@@  @@@@      @@@@   @@@@           @@@@ @@@  @@@@
  39  *       @@@   @@   @@@  @@@        @@@   @@@            @@@  @@@   @@@
  40  *       @@@  @@@@  @@@  @@@        @@@   @@@            @@@  @@@   @@@
  41  *       @@@@ @@@@ @@@@  @@@        @@@   @@@            @@@  @@@   @@@
  42  *        @@@@@@@@@@@@   @@@@      @@@@   @@@            @@@  @@@   @@@
  43  *         @@@@  @@@@     @@@@@@@@@@@@    @@@            @@@  @@@   @@@
  44  *          @@    @@       @@@@@@@@@@     @@@            @@@  @@@   @@@
  45  *
  46  *                               Eric P. Scott
  47  *                        Caltech High Energy Physics
  48  *                               October, 1980
  49  *
  50  */
  51 #include <sys/types.h>
  52 #include <curses.h>
  53 #include <err.h>
  54 #include <signal.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <unistd.h>
  58
  59 static const struct options {
  60         int nopts;
  61         int opts[3];
  62 }
  63         normal[8] = {
  64         { 3, { 7, 0, 1 } },
  65         { 3, { 0, 1, 2 } },
  66         { 3, { 1, 2, 3 } },
  67         { 3, { 2, 3, 4 } },
  68         { 3, { 3, 4, 5 } },
  69         { 3, { 4, 5, 6 } },
  70         { 3, { 5, 6, 7 } },
  71         { 3, { 6, 7, 0 } }
  72 },      upper[8] = {
  73         { 1, { 1, 0, 0 } },
  74         { 2, { 1, 2, 0 } },
  75         { 0, { 0, 0, 0 } },
  76         { 0, { 0, 0, 0 } },
  77         { 0, { 0, 0, 0 } },
  78         { 2, { 4, 5, 0 } },
  79         { 1, { 5, 0, 0 } },
  80         { 2, { 1, 5, 0 } }
  81 },
  82         left[8] = {
  83         { 0, { 0, 0, 0 } },
  84         { 0, { 0, 0, 0 } },
  85         { 0, { 0, 0, 0 } },
  86         { 2, { 2, 3, 0 } },
  87         { 1, { 3, 0, 0 } },
  88         { 2, { 3, 7, 0 } },
  89         { 1, { 7, 0, 0 } },
  90         { 2, { 7, 0, 0 } }
  91 },
  92         right[8] = {
  93         { 1, { 7, 0, 0 } },
  94         { 2, { 3, 7, 0 } },
  95         { 1, { 3, 0, 0 } },
  96         { 2, { 3, 4, 0 } },
  97         { 0, { 0, 0, 0 } },
  98         { 0, { 0, 0, 0 } },
  99         { 0, { 0, 0, 0 } },
 100         { 2, { 6, 7, 0 } }
 101 },
 102         lower[8] = {
 103         { 0, { 0, 0, 0 } },
 104         { 2, { 0, 1, 0 } },
 105         { 1, { 1, 0, 0 } },
 106         { 2, { 1, 5, 0 } },
 107         { 1, { 5, 0, 0 } },
 108         { 2, { 5, 6, 0 } },
 109         { 0, { 0, 0, 0 } },
 110         { 0, { 0, 0, 0 } }
 111 },
 112         upleft[8] = {
 113         { 0, { 0, 0, 0 } },
 114         { 0, { 0, 0, 0 } },
 115         { 0, { 0, 0, 0 } },
 116         { 0, { 0, 0, 0 } },
 117         { 0, { 0, 0, 0 } },
 118         { 1, { 3, 0, 0 } },
 119         { 2, { 1, 3, 0 } },
 120         { 1, { 1, 0, 0 } }
 121 },
 122         upright[8] = {
 123         { 2, { 3, 5, 0 } },
 124         { 1, { 3, 0, 0 } },
 125         { 0, { 0, 0, 0 } },
 126         { 0, { 0, 0, 0 } },
 127         { 0, { 0, 0, 0 } },
 128         { 0, { 0, 0, 0 } },
 129         { 0, { 0, 0, 0 } },
 130         { 1, { 5, 0, 0 } }
 131 },
 132         lowleft[8] = {
 133         { 3, { 7, 0, 1 } },
 134         { 0, { 0, 0, 0 } },
 135         { 0, { 0, 0, 0 } },
 136         { 1, { 1, 0, 0 } },
 137         { 2, { 1, 7, 0 } },
 138         { 1, { 7, 0, 0 } },
 139         { 0, { 0, 0, 0 } },
 140         { 0, { 0, 0, 0 } }
 141 },
 142         lowright[8] = {
 143         { 0, { 0, 0, 0 } },
 144         { 1, { 7, 0, 0 } },
 145         { 2, { 5, 7, 0 } },
 146         { 1, { 5, 0, 0 } },
 147         { 0, { 0, 0, 0 } },
 148         { 0, { 0, 0, 0 } },
 149         { 0, { 0, 0, 0 } },
 150         { 0, { 0, 0, 0 } }
 151 };
 152
 153
 154 static const char       flavor[] = {
 155         'O', '*', '#', '$', '%', '0', '@', '~'
 156 };
 157 static const short      xinc[] = {
 158         1,  1,  1,  0, -1, -1, -1,  0
 159 }, yinc[] = {
 160         -1,  0,  1,  1,  1,  0, -1, -1
 161 };
 162 static struct   worm {
 163         int orientation, head;
 164         short *xpos, *ypos;
 165 } *worm;
 166
 167 static volatile sig_atomic_t sig_caught = 0;
 168
 169 static void nomem(void) __dead2;
 170 static void onsig(int);
 171
 172 int
 173 main(int argc, char **argv)
 174 {
 175         int x, y, h, n;
 176         struct worm *w;
 177         const struct options *op;
 178         short *ip;
 179         int CO, LI, last, bottom, ch, length, number, trail;
 180         short **ref;
 181         const char *field;
 182         char *mp;
 183         unsigned int delay = 0;
 184
 185         mp = NULL;
 186         length = 16;
 187         number = 3;
 188         trail = ' ';
 189         field = NULL;
 190         while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
 191                 switch(ch) {
 192                 case 'd':
 193                         if ((delay = (unsigned int)strtoul(optarg, NULL, 10)) < 1 || delay > 1000)
 194                                 errx(1, "invalid delay (1-1000)");
 195                         delay *= 1000;  /* ms -> us */
 196                         break;
 197                 case 'f':
 198                         field = "WORM";
 199                         break;
 200                 case 'l':
 201                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 202                                 errx(1, "invalid length (%d - %d).",
 203                                      2, 1024);
 204                         }
 205                         break;
 206                 case 'n':
 207                         if ((number = atoi(optarg)) < 1) {
 208                                 errx(1, "invalid number of worms.");
 209                         }
 210                         break;
 211                 case 't':
 212                         trail = '.';
 213                         break;
 214                 case '?':
 215                 default:
 216                         fprintf(stderr,
 217                             "usage: worms [-ft] [-d delay] [-l length] [-n number]\n");
 218                         exit(1);
 219                 }
 220
 221         if (!(worm = malloc((size_t)number *
 222             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 223                 nomem();
 224         initscr();
 225         CO = COLS;
 226         LI = LINES;
 227         last = CO - 1;
 228         bottom = LI - 1;
 229         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 230                 nomem();
 231         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 232                 nomem();
 233         for (n = 0; n < LI; ++n) {
 234                 ref[n] = ip;
 235                 ip += CO;
 236         }
 237         for (ip = ref[0], n = LI * CO; --n >= 0;)
 238                 *ip++ = 0;
 239         for (n = number, w = &worm[0]; --n >= 0; w++) {
 240                 w->orientation = w->head = 0;
 241                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 242                         nomem();
 243                 w->xpos = ip;
 244                 for (x = length; --x >= 0;)
 245                         *ip++ = -1;
 246                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 247                         nomem();
 248                 w->ypos = ip;
 249                 for (y = length; --y >= 0;)
 250                         *ip++ = -1;
 251         }
 252
 253         signal(SIGHUP, onsig);
 254         signal(SIGINT, onsig);
 255         signal(SIGQUIT, onsig);
 256         signal(SIGSTOP, onsig);
 257         signal(SIGTSTP, onsig);
 258         signal(SIGTERM, onsig);
 259
 260         if (field) {
 261                 const char *p = field;
 262
 263                 for (y = LI; --y >= 0;) {
 264                         for (x = CO; --x >= 0;) {
 265                                 addch(*p++);
 266                                 if (!*p)
 267                                         p = field;
 268                         }
 269                         refresh();
 270                 }
 271         }
 272         for (;;) {
 273                 refresh();
 274                 if (sig_caught) {
 275                         endwin();
 276                         exit(0);
 277                 }
 278                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 279                         if ((x = w->xpos[h = w->head]) < 0) {
 280                                 mvaddch(y = w->ypos[h] = bottom,
 281                                         x = w->xpos[h] = 0,
 282                                         flavor[n % sizeof(flavor)]);
 283                                 ref[y][x]++;
 284                         }
 285                         else
 286                                 y = w->ypos[h];
 287                         if (++h == length)
 288                                 h = 0;
 289                         if (w->xpos[w->head = h] >= 0) {
 290                                 int x1, y1;
 291
 292                                 x1 = w->xpos[h];
 293                                 y1 = w->ypos[h];
 294                                 if (--ref[y1][x1] == 0) {
 295                                         mvaddch(y1, x1, trail);
 296                                 }
 297                         }
 298                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 299                         switch (op->nopts) {
 300                         case 0:
 301                                 refresh();
 302                                 abort();
 303                                 return(1);
 304                         case 1:
 305                                 w->orientation = op->opts[0];
 306                                 break;
 307                         default:
 308                                 w->orientation =
 309                                     op->opts[(int)random() % op->nopts];
 310                         }
 311                         mvaddch(y += yinc[w->orientation],
 312                                 x += xinc[w->orientation],
 313                                 flavor[n % sizeof(flavor)]);
 314                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 315                 }
 316                 if (usleep(delay))
 317                         onsig(SIGTERM);
 318         }
 319 }
 320
 321 static void
 322 onsig(int signo __unused)
 323 {
 324         sig_caught = 1;
 325 }
 326
 327 static void
 328 nomem(void)
 329 {
 330         errx(1, "not enough memory.");
 331 }