1 /* $NetBSD: worms.c,v 1.22 2012/06/19 05:46:09 dholland 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)worms.c 8.1 (Berkeley) 5/31/93"; 41 #else 42 __RCSID("$NetBSD: worms.c,v 1.22 2012/06/19 05:46:09 dholland Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * 48 * @@@ @@@ @@@@@@@@@@ @@@@@@@@@@@ @@@@@@@@@@@@ 49 * @@@ @@@ @@@@@@@@@@@@ @@@@@@@@@@@@ @@@@@@@@@@@@@ 50 * @@@ @@@ @@@@ @@@@ @@@@ @@@@ @@@ @@@@ 51 * @@@ @@ @@@ @@@ @@@ @@@ @@@ @@@ @@@ 52 * @@@ @@@@ @@@ @@@ @@@ @@@ @@@ @@@ @@@ 53 * @@@@ @@@@ @@@@ @@@ @@@ @@@ @@@ @@@ @@@ 54 * @@@@@@@@@@@@ @@@@ @@@@ @@@ @@@ @@@ @@@ 55 * @@@@ @@@@ @@@@@@@@@@@@ @@@ @@@ @@@ @@@ 56 * @@ @@ @@@@@@@@@@ @@@ @@@ @@@ @@@ 57 * 58 * Eric P. Scott 59 * Caltech High Energy Physics 60 * October, 1980 61 * 62 */ 63 #include <sys/types.h> 64 65 #include <curses.h> 66 #include <err.h> 67 #include <signal.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <unistd.h> 71 72 static const struct options { 73 int nopts; 74 int opts[3]; 75 } 76 normal[8] = { 77 { 3, { 7, 0, 1 } }, 78 { 3, { 0, 1, 2 } }, 79 { 3, { 1, 2, 3 } }, 80 { 3, { 2, 3, 4 } }, 81 { 3, { 3, 4, 5 } }, 82 { 3, { 4, 5, 6 } }, 83 { 3, { 5, 6, 7 } }, 84 { 3, { 6, 7, 0 } } 85 }, upper[8] = { 86 { 1, { 1, 0, 0 } }, 87 { 2, { 1, 2, 0 } }, 88 { 0, { 0, 0, 0 } }, 89 { 0, { 0, 0, 0 } }, 90 { 0, { 0, 0, 0 } }, 91 { 2, { 4, 5, 0 } }, 92 { 1, { 5, 0, 0 } }, 93 { 2, { 1, 5, 0 } } 94 }, 95 left[8] = { 96 { 0, { 0, 0, 0 } }, 97 { 0, { 0, 0, 0 } }, 98 { 0, { 0, 0, 0 } }, 99 { 2, { 2, 3, 0 } }, 100 { 1, { 3, 0, 0 } }, 101 { 2, { 3, 7, 0 } }, 102 { 1, { 7, 0, 0 } }, 103 { 2, { 7, 0, 0 } } 104 }, 105 right[8] = { 106 { 1, { 7, 0, 0 } }, 107 { 2, { 3, 7, 0 } }, 108 { 1, { 3, 0, 0 } }, 109 { 2, { 3, 4, 0 } }, 110 { 0, { 0, 0, 0 } }, 111 { 0, { 0, 0, 0 } }, 112 { 0, { 0, 0, 0 } }, 113 { 2, { 6, 7, 0 } } 114 }, 115 lower[8] = { 116 { 0, { 0, 0, 0 } }, 117 { 2, { 0, 1, 0 } }, 118 { 1, { 1, 0, 0 } }, 119 { 2, { 1, 5, 0 } }, 120 { 1, { 5, 0, 0 } }, 121 { 2, { 5, 6, 0 } }, 122 { 0, { 0, 0, 0 } }, 123 { 0, { 0, 0, 0 } } 124 }, 125 upleft[8] = { 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, { 3, 0, 0 } }, 132 { 2, { 1, 3, 0 } }, 133 { 1, { 1, 0, 0 } } 134 }, 135 upright[8] = { 136 { 2, { 3, 5, 0 } }, 137 { 1, { 3, 0, 0 } }, 138 { 0, { 0, 0, 0 } }, 139 { 0, { 0, 0, 0 } }, 140 { 0, { 0, 0, 0 } }, 141 { 0, { 0, 0, 0 } }, 142 { 0, { 0, 0, 0 } }, 143 { 1, { 5, 0, 0 } } 144 }, 145 lowleft[8] = { 146 { 3, { 7, 0, 1 } }, 147 { 0, { 0, 0, 0 } }, 148 { 0, { 0, 0, 0 } }, 149 { 1, { 1, 0, 0 } }, 150 { 2, { 1, 7, 0 } }, 151 { 1, { 7, 0, 0 } }, 152 { 0, { 0, 0, 0 } }, 153 { 0, { 0, 0, 0 } } 154 }, 155 lowright[8] = { 156 { 0, { 0, 0, 0 } }, 157 { 1, { 7, 0, 0 } }, 158 { 2, { 5, 7, 0 } }, 159 { 1, { 5, 0, 0 } }, 160 { 0, { 0, 0, 0 } }, 161 { 0, { 0, 0, 0 } }, 162 { 0, { 0, 0, 0 } }, 163 { 0, { 0, 0, 0 } } 164 }; 165 166 167 static const char flavor[] = { 168 'O', '*', '#', '$', '%', '0', '@', '~' 169 }; 170 static const short xinc[] = { 171 1, 1, 1, 0, -1, -1, -1, 0 172 }, yinc[] = { 173 -1, 0, 1, 1, 1, 0, -1, -1 174 }; 175 static struct worm { 176 int orientation, head; 177 short *xpos, *ypos; 178 } *worm; 179 180 static volatile sig_atomic_t sig_caught = 0; 181 182 int main(int, char **); 183 static void nomem(void) __dead; 184 static void onsig(int); 185 186 int 187 main(int argc, char *argv[]) 188 { 189 int x, y, h, n; 190 struct worm *w; 191 const struct options *op; 192 short *ip; 193 int CO, LI, last, bottom, ch, length, number, trail; 194 short **ref; 195 const char *field; 196 char *mp; 197 unsigned int delay = 0; 198 199 mp = NULL; 200 length = 16; 201 number = 3; 202 trail = ' '; 203 field = NULL; 204 while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1) 205 switch(ch) { 206 case 'd': 207 if ((delay = (unsigned int)strtoul(optarg, NULL, 10)) < 1 || delay > 1000) 208 errx(1, "invalid delay (1-1000)"); 209 delay *= 1000; /* ms -> us */ 210 break; 211 case 'f': 212 field = "WORM"; 213 break; 214 case 'l': 215 if ((length = atoi(optarg)) < 2 || length > 1024) { 216 errx(1, "invalid length (%d - %d).", 217 2, 1024); 218 } 219 break; 220 case 'n': 221 if ((number = atoi(optarg)) < 1) { 222 errx(1, "invalid number of worms."); 223 } 224 break; 225 case 't': 226 trail = '.'; 227 break; 228 case '?': 229 default: 230 (void)fprintf(stderr, 231 "usage: worms [-ft] [-d delay] [-l length] [-n number]\n"); 232 exit(1); 233 } 234 235 if (!(worm = malloc((size_t)number * 236 sizeof(struct worm))) || !(mp = malloc((size_t)1024))) 237 nomem(); 238 if (!initscr()) 239 errx(0, "couldn't initialize screen"); 240 curs_set(0); 241 CO = COLS; 242 LI = LINES; 243 last = CO - 1; 244 bottom = LI - 1; 245 if (!(ip = malloc((size_t)(LI * CO * sizeof(short))))) 246 nomem(); 247 if (!(ref = malloc((size_t)(LI * sizeof(short *))))) 248 nomem(); 249 for (n = 0; n < LI; ++n) { 250 ref[n] = ip; 251 ip += CO; 252 } 253 for (ip = ref[0], n = LI * CO; --n >= 0;) 254 *ip++ = 0; 255 for (n = number, w = &worm[0]; --n >= 0; w++) { 256 w->orientation = w->head = 0; 257 if (!(ip = malloc((size_t)(length * sizeof(short))))) 258 nomem(); 259 w->xpos = ip; 260 for (x = length; --x >= 0;) 261 *ip++ = -1; 262 if (!(ip = malloc((size_t)(length * sizeof(short))))) 263 nomem(); 264 w->ypos = ip; 265 for (y = length; --y >= 0;) 266 *ip++ = -1; 267 } 268 269 (void)signal(SIGHUP, onsig); 270 (void)signal(SIGINT, onsig); 271 (void)signal(SIGQUIT, onsig); 272 (void)signal(SIGTSTP, onsig); 273 (void)signal(SIGTERM, onsig); 274 275 if (field) { 276 const char *p = field; 277 278 for (y = LI; --y >= 0;) { 279 for (x = CO; --x >= 0;) { 280 addch(*p++); 281 if (!*p) 282 p = field; 283 } 284 refresh(); 285 } 286 } 287 for (;;) { 288 refresh(); 289 if (sig_caught) { 290 endwin(); 291 exit(0); 292 } 293 if (delay) { 294 if (delay % 1000000 != 0) 295 usleep(delay % 1000000); 296 if (delay >= 1000000) 297 sleep(delay / 1000000); 298 } 299 for (n = 0, w = &worm[0]; n < number; n++, w++) { 300 if ((x = w->xpos[h = w->head]) < 0) { 301 mvaddch(y = w->ypos[h] = bottom, 302 x = w->xpos[h] = 0, 303 flavor[n % sizeof(flavor)]); 304 ref[y][x]++; 305 } 306 else 307 y = w->ypos[h]; 308 if (++h == length) 309 h = 0; 310 if (w->xpos[w->head = h] >= 0) { 311 int x1, y1; 312 313 x1 = w->xpos[h]; 314 y1 = w->ypos[h]; 315 if (--ref[y1][x1] == 0) { 316 mvaddch(y1, x1, trail); 317 } 318 } 319 op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation]; 320 switch (op->nopts) { 321 case 0: 322 refresh(); 323 abort(); 324 return(1); 325 case 1: 326 w->orientation = op->opts[0]; 327 break; 328 default: 329 w->orientation = 330 op->opts[(int)random() % op->nopts]; 331 } 332 mvaddch(y += yinc[w->orientation], 333 x += xinc[w->orientation], 334 flavor[n % sizeof(flavor)]); 335 ref[w->ypos[h] = y][w->xpos[h] = x]++; 336 } 337 } 338 } 339 340 static void 341 onsig(int signo __unused) 342 { 343 sig_caught = 1; 344 } 345 346 static void 347 nomem(void) 348 { 349 errx(1, "not enough memory."); 350 } 351