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  * $DragonFly: src/games/worms/worms.c,v 1.5 2007/04/18 18:32:12 swildner Exp $
  33  */
  34
  35 /*
  36  *
  37  *       @@@        @@@    @@@@@@@@@@     @@@@@@@@@@@    @@@@@@@@@@@@
  38  *       @@@        @@@   @@@@@@@@@@@@    @@@@@@@@@@@@   @@@@@@@@@@@@@
  39  *       @@@        @@@  @@@@      @@@@   @@@@           @@@@ @@@  @@@@
  40  *       @@@   @@   @@@  @@@        @@@   @@@            @@@  @@@   @@@
  41  *       @@@  @@@@  @@@  @@@        @@@   @@@            @@@  @@@   @@@
  42  *       @@@@ @@@@ @@@@  @@@        @@@   @@@            @@@  @@@   @@@
  43  *        @@@@@@@@@@@@   @@@@      @@@@   @@@            @@@  @@@   @@@
  44  *         @@@@  @@@@     @@@@@@@@@@@@    @@@            @@@  @@@   @@@
  45  *          @@    @@       @@@@@@@@@@     @@@            @@@  @@@   @@@
  46  *
  47  *                               Eric P. Scott
  48  *                        Caltech High Energy Physics
  49  *                               October, 1980
  50  *
  51  */
  52 #include <sys/types.h>
  53 #include <curses.h>
  54 #include <err.h>
  55 #include <signal.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <unistd.h>
  59
  60 static const struct options {
  61         int nopts;
  62         int opts[3];
  63 }
  64         normal[8] = {
  65         { 3, { 7, 0, 1 } },
  66         { 3, { 0, 1, 2 } },
  67         { 3, { 1, 2, 3 } },
  68         { 3, { 2, 3, 4 } },
  69         { 3, { 3, 4, 5 } },
  70         { 3, { 4, 5, 6 } },
  71         { 3, { 5, 6, 7 } },
  72         { 3, { 6, 7, 0 } }
  73 },      upper[8] = {
  74         { 1, { 1, 0, 0 } },
  75         { 2, { 1, 2, 0 } },
  76         { 0, { 0, 0, 0 } },
  77         { 0, { 0, 0, 0 } },
  78         { 0, { 0, 0, 0 } },
  79         { 2, { 4, 5, 0 } },
  80         { 1, { 5, 0, 0 } },
  81         { 2, { 1, 5, 0 } }
  82 },
  83         left[8] = {
  84         { 0, { 0, 0, 0 } },
  85         { 0, { 0, 0, 0 } },
  86         { 0, { 0, 0, 0 } },
  87         { 2, { 2, 3, 0 } },
  88         { 1, { 3, 0, 0 } },
  89         { 2, { 3, 7, 0 } },
  90         { 1, { 7, 0, 0 } },
  91         { 2, { 7, 0, 0 } }
  92 },
  93         right[8] = {
  94         { 1, { 7, 0, 0 } },
  95         { 2, { 3, 7, 0 } },
  96         { 1, { 3, 0, 0 } },
  97         { 2, { 3, 4, 0 } },
  98         { 0, { 0, 0, 0 } },
  99         { 0, { 0, 0, 0 } },
 100         { 0, { 0, 0, 0 } },
 101         { 2, { 6, 7, 0 } }
 102 },
 103         lower[8] = {
 104         { 0, { 0, 0, 0 } },
 105         { 2, { 0, 1, 0 } },
 106         { 1, { 1, 0, 0 } },
 107         { 2, { 1, 5, 0 } },
 108         { 1, { 5, 0, 0 } },
 109         { 2, { 5, 6, 0 } },
 110         { 0, { 0, 0, 0 } },
 111         { 0, { 0, 0, 0 } }
 112 },
 113         upleft[8] = {
 114         { 0, { 0, 0, 0 } },
 115         { 0, { 0, 0, 0 } },
 116         { 0, { 0, 0, 0 } },
 117         { 0, { 0, 0, 0 } },
 118         { 0, { 0, 0, 0 } },
 119         { 1, { 3, 0, 0 } },
 120         { 2, { 1, 3, 0 } },
 121         { 1, { 1, 0, 0 } }
 122 },
 123         upright[8] = {
 124         { 2, { 3, 5, 0 } },
 125         { 1, { 3, 0, 0 } },
 126         { 0, { 0, 0, 0 } },
 127         { 0, { 0, 0, 0 } },
 128         { 0, { 0, 0, 0 } },
 129         { 0, { 0, 0, 0 } },
 130         { 0, { 0, 0, 0 } },
 131         { 1, { 5, 0, 0 } }
 132 },
 133         lowleft[8] = {
 134         { 3, { 7, 0, 1 } },
 135         { 0, { 0, 0, 0 } },
 136         { 0, { 0, 0, 0 } },
 137         { 1, { 1, 0, 0 } },
 138         { 2, { 1, 7, 0 } },
 139         { 1, { 7, 0, 0 } },
 140         { 0, { 0, 0, 0 } },
 141         { 0, { 0, 0, 0 } }
 142 },
 143         lowright[8] = {
 144         { 0, { 0, 0, 0 } },
 145         { 1, { 7, 0, 0 } },
 146         { 2, { 5, 7, 0 } },
 147         { 1, { 5, 0, 0 } },
 148         { 0, { 0, 0, 0 } },
 149         { 0, { 0, 0, 0 } },
 150         { 0, { 0, 0, 0 } },
 151         { 0, { 0, 0, 0 } }
 152 };
 153
 154
 155 static const char       flavor[] = {
 156         'O', '*', '#', '$', '%', '0', '@', '~'
 157 };
 158 static const short      xinc[] = {
 159         1,  1,  1,  0, -1, -1, -1,  0
 160 }, yinc[] = {
 161         -1,  0,  1,  1,  1,  0, -1, -1
 162 };
 163 static struct   worm {
 164         int orientation, head;
 165         short *xpos, *ypos;
 166 } *worm;
 167
 168 volatile sig_atomic_t sig_caught = 0;
 169
 170 void nomem(void);
 171 void onsig(int);
 172
 173 int
 174 main(int argc, char **argv)
 175 {
 176         int x, y, h, n;
 177         struct worm *w;
 178         const struct options *op;
 179         short *ip;
 180         int CO, LI, last, bottom, ch, length, number, trail;
 181         short **ref;
 182         const char *field;
 183         char *mp;
 184         unsigned int delay = 0;
 185
 186         mp = NULL;
 187         length = 16;
 188         number = 3;
 189         trail = ' ';
 190         field = NULL;
 191         while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
 192                 switch(ch) {
 193                 case 'd':
 194                         if ((delay = (unsigned int)strtoul(optarg, NULL, 10)) < 1 || delay > 1000)
 195                                 errx(1, "invalid delay (1-1000)");
 196                         delay *= 1000;  /* ms -> us */
 197                         break;
 198                 case 'f':
 199                         field = "WORM";
 200                         break;
 201                 case 'l':
 202                         if ((length = atoi(optarg)) < 2 || length > 1024) {
 203                                 errx(1, "invalid length (%d - %d).",
 204                                      2, 1024);
 205                         }
 206                         break;
 207                 case 'n':
 208                         if ((number = atoi(optarg)) < 1) {
 209                                 errx(1, "invalid number of worms.");
 210                         }
 211                         break;
 212                 case 't':
 213                         trail = '.';
 214                         break;
 215                 case '?':
 216                 default:
 217                         (void)fprintf(stderr,
 218                             "usage: worms [-ft] [-d delay] [-l length] [-n number]\n");
 219                         exit(1);
 220                 }
 221
 222         if (!(worm = malloc((size_t)number *
 223             sizeof(struct worm))) || !(mp = malloc((size_t)1024)))
 224                 nomem();
 225         initscr();
 226         CO = COLS;
 227         LI = LINES;
 228         last = CO - 1;
 229         bottom = LI - 1;
 230         if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
 231                 nomem();
 232         if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
 233                 nomem();
 234         for (n = 0; n < LI; ++n) {
 235                 ref[n] = ip;
 236                 ip += CO;
 237         }
 238         for (ip = ref[0], n = LI * CO; --n >= 0;)
 239                 *ip++ = 0;
 240         for (n = number, w = &worm[0]; --n >= 0; w++) {
 241                 w->orientation = w->head = 0;
 242                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 243                         nomem();
 244                 w->xpos = ip;
 245                 for (x = length; --x >= 0;)
 246                         *ip++ = -1;
 247                 if (!(ip = malloc((size_t)(length * sizeof(short)))))
 248                         nomem();
 249                 w->ypos = ip;
 250                 for (y = length; --y >= 0;)
 251                         *ip++ = -1;
 252         }
 253
 254         (void)signal(SIGHUP, onsig);
 255         (void)signal(SIGINT, onsig);
 256         (void)signal(SIGQUIT, onsig);
 257         (void)signal(SIGSTOP, onsig);
 258         (void)signal(SIGTSTP, onsig);
 259         (void)signal(SIGTERM, onsig);
 260
 261         if (field) {
 262                 const char *p = field;
 263
 264                 for (y = LI; --y >= 0;) {
 265                         for (x = CO; --x >= 0;) {
 266                                 addch(*p++);
 267                                 if (!*p)
 268                                         p = field;
 269                         }
 270                         refresh();
 271                 }
 272         }
 273         for (;;) {
 274                 refresh();
 275                 if (sig_caught) {
 276                         endwin();
 277                         exit(0);
 278                 }
 279                 for (n = 0, w = &worm[0]; n < number; n++, w++) {
 280                         if ((x = w->xpos[h = w->head]) < 0) {
 281                                 mvaddch(y = w->ypos[h] = bottom,
 282                                         x = w->xpos[h] = 0,
 283                                         flavor[n % sizeof(flavor)]);
 284                                 ref[y][x]++;
 285                         }
 286                         else
 287                                 y = w->ypos[h];
 288                         if (++h == length)
 289                                 h = 0;
 290                         if (w->xpos[w->head = h] >= 0) {
 291                                 int x1, y1;
 292
 293                                 x1 = w->xpos[h];
 294                                 y1 = w->ypos[h];
 295                                 if (--ref[y1][x1] == 0) {
 296                                         mvaddch(y1, x1, trail);
 297                                 }
 298                         }
 299                         op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
 300                         switch (op->nopts) {
 301                         case 0:
 302                                 refresh();
 303                                 abort();
 304                                 return(1);
 305                         case 1:
 306                                 w->orientation = op->opts[0];
 307                                 break;
 308                         default:
 309                                 w->orientation =
 310                                     op->opts[(int)random() % op->nopts];
 311                         }
 312                         mvaddch(y += yinc[w->orientation],
 313                                 x += xinc[w->orientation],
 314                                 flavor[n % sizeof(flavor)]);
 315                         ref[w->ypos[h] = y][w->xpos[h] = x]++;
 316                 }
 317                 if (usleep(delay))
 318                         onsig(SIGTERM);
 319         }
 320 }
 321
 322 void
 323 onsig(int signo __unused)
 324 {
 325         sig_caught = 1;
 326 }
 327
 328 void
 329 nomem(void)
 330 {
 331         errx(1, "not enough memory.");
 332 }