worms.c revision 1.26 1 /* $NetBSD: worms.c,v 1.26 2023/04/15 15:21:56 kre 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 1.26 2023/04/15 15:21:56 kre 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 <ctype.h>
66 #include <curses.h>
67 #include <err.h>
68 #include <limits.h>
69 #include <signal.h>
70 #include <stdio.h>
71 #include <stdlib.h>
72 #include <strings.h>
73 #include <unistd.h>
74
75 static const struct options {
76 int nopts;
77 int opts[3];
78 }
79 normal[8] = {
80 { 3, { 7, 0, 1 } },
81 { 3, { 0, 1, 2 } },
82 { 3, { 1, 2, 3 } },
83 { 3, { 2, 3, 4 } },
84 { 3, { 3, 4, 5 } },
85 { 3, { 4, 5, 6 } },
86 { 3, { 5, 6, 7 } },
87 { 3, { 6, 7, 0 } }
88 }, upper[8] = {
89 { 1, { 1, 0, 0 } },
90 { 2, { 1, 2, 0 } },
91 { 0, { 0, 0, 0 } },
92 { 0, { 0, 0, 0 } },
93 { 0, { 0, 0, 0 } },
94 { 2, { 4, 5, 0 } },
95 { 1, { 5, 0, 0 } },
96 { 2, { 1, 5, 0 } }
97 },
98 left[8] = {
99 { 0, { 0, 0, 0 } },
100 { 0, { 0, 0, 0 } },
101 { 0, { 0, 0, 0 } },
102 { 2, { 2, 3, 0 } },
103 { 1, { 3, 0, 0 } },
104 { 2, { 3, 7, 0 } },
105 { 1, { 7, 0, 0 } },
106 { 2, { 7, 0, 0 } }
107 },
108 right[8] = {
109 { 1, { 7, 0, 0 } },
110 { 2, { 3, 7, 0 } },
111 { 1, { 3, 0, 0 } },
112 { 2, { 3, 4, 0 } },
113 { 0, { 0, 0, 0 } },
114 { 0, { 0, 0, 0 } },
115 { 0, { 0, 0, 0 } },
116 { 2, { 6, 7, 0 } }
117 },
118 lower[8] = {
119 { 0, { 0, 0, 0 } },
120 { 2, { 0, 1, 0 } },
121 { 1, { 1, 0, 0 } },
122 { 2, { 1, 5, 0 } },
123 { 1, { 5, 0, 0 } },
124 { 2, { 5, 6, 0 } },
125 { 0, { 0, 0, 0 } },
126 { 0, { 0, 0, 0 } }
127 },
128 upleft[8] = {
129 { 0, { 0, 0, 0 } },
130 { 0, { 0, 0, 0 } },
131 { 0, { 0, 0, 0 } },
132 { 0, { 0, 0, 0 } },
133 { 0, { 0, 0, 0 } },
134 { 1, { 3, 0, 0 } },
135 { 2, { 1, 3, 0 } },
136 { 1, { 1, 0, 0 } }
137 },
138 upright[8] = {
139 { 2, { 3, 5, 0 } },
140 { 1, { 3, 0, 0 } },
141 { 0, { 0, 0, 0 } },
142 { 0, { 0, 0, 0 } },
143 { 0, { 0, 0, 0 } },
144 { 0, { 0, 0, 0 } },
145 { 0, { 0, 0, 0 } },
146 { 1, { 5, 0, 0 } }
147 },
148 lowleft[8] = {
149 { 3, { 7, 0, 1 } },
150 { 0, { 0, 0, 0 } },
151 { 0, { 0, 0, 0 } },
152 { 1, { 1, 0, 0 } },
153 { 2, { 1, 7, 0 } },
154 { 1, { 7, 0, 0 } },
155 { 0, { 0, 0, 0 } },
156 { 0, { 0, 0, 0 } }
157 },
158 lowright[8] = {
159 { 0, { 0, 0, 0 } },
160 { 1, { 7, 0, 0 } },
161 { 2, { 5, 7, 0 } },
162 { 1, { 5, 0, 0 } },
163 { 0, { 0, 0, 0 } },
164 { 0, { 0, 0, 0 } },
165 { 0, { 0, 0, 0 } },
166 { 0, { 0, 0, 0 } }
167 };
168
169
170 static const char flavor[] = {
171 'O', '*', '#', '$', '%', '0', '@', '~'
172 };
173 static const short xinc[] = {
174 1, 1, 1, 0, -1, -1, -1, 0
175 }, yinc[] = {
176 -1, 0, 1, 1, 1, 0, -1, -1
177 };
178 static struct worm {
179 int orientation, head;
180 short *xpos, *ypos;
181 } *worm;
182
183 static volatile sig_atomic_t sig_caught = 0;
184
185 int main(int, char **);
186 static void nomem(void) __dead;
187 static void onsig(int);
188
189 int
190 main(int argc, char *argv[])
191 {
192 int x, y, h, n;
193 struct worm *w;
194 const struct options *op;
195 short *ip;
196 int CO, LI, last, bottom, ch, length, number, trail;
197 short **ref;
198 const char *field;
199 char *ep;
200 unsigned int delay = 20000;
201 unsigned long ul;
202
203 length = 16;
204 number = 3;
205 trail = ' ';
206 field = NULL;
207 while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
208 switch(ch) {
209 case 'd':
210 ul = strtoul(optarg, &ep, 10);
211 if (ep != optarg) {
212 while (isspace(*(unsigned char *)ep))
213 ep++;
214 }
215 if (ep == optarg ||
216 (*ep != '\0' &&
217 ( ep[1] == '\0' ? (*ep != 'm' && *ep != 'u') :
218 ( strcasecmp(ep, "ms") != 0 &&
219 strcasecmp(ep, "us") != 0 )) )) {
220 errx(1, "-d: invalid delay (%s)", optarg);
221 }
222 /*
223 * if ul >= INT_MAX/1000 we don't need the *1000,
224 * as even without that it will exceed the limit
225 * just below and be treated as an error.
226 * (This does assume >=32 bit int, but so does POSIX)
227 */
228 if (*ep != 'u' && ul < INT_MAX / 1000)
229 ul *= 1000; /* ms -> us */
230 if (ul > 1000*1000) {
231 errx(1,
232 "-d: delay (%s) out of rannge [0 - 1000]",
233 optarg);
234 }
235 delay = (unsigned int)ul;
236 break;
237 case 'f':
238 field = "WORM";
239 break;
240 case 'l':
241 ul = strtoul(optarg, &ep, 10);
242 if (ep == optarg || *ep != '\0' ||
243 ul < 2 || ul > 1024) {
244 errx(1, "-l: invalid length (%s) [%d - %d].",
245 optarg, 2, 1024);
246 }
247 length = (int)ul;
248 break;
249 case 'n':
250 ul = strtoul(optarg, &ep, 10);
251 if (ep == optarg || *ep != '\0' ||
252 ul < 1 || ul > INT_MAX / 10 ) {
253 errx(1, "-n: invalid number of worms (%s).",
254 optarg);
255 }
256 /* upper bound is further limited later */
257 number = (int)ul;
258 break;
259 case 't':
260 trail = '.';
261 break;
262 case '?':
263 default:
264 (void)fprintf(stderr,
265 "usage: worms [-ft] [-d delay] [-l length]"
266 " [-n number]\n");
267 exit(1);
268 }
269
270 if (!initscr())
271 errx(1, "couldn't initialize screen");
272 curs_set(0);
273 CO = COLS;
274 LI = LINES;
275
276 if (CO > 4*length || LI < 4*length) {
277 ul = (unsigned long)LI / 2;
278 ul *= (unsigned long)CO / length;
279 } else {
280 ul = (unsigned long)CO / 2;
281 ul *= (unsigned long)LI / length;
282 }
283
284 if ((unsigned long)(unsigned)number > ul) {
285 endwin();
286 errx(1, "-n: too many worms (%d) max: %lu", number, ul);
287 }
288 if (!(worm = calloc((size_t)number, sizeof(struct worm))))
289 nomem();
290
291 last = CO - 1;
292 bottom = LI - 1;
293 if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
294 nomem();
295 if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
296 nomem();
297 for (n = 0; n < LI; ++n) {
298 ref[n] = ip;
299 ip += CO;
300 }
301 for (ip = ref[0], n = LI * CO; --n >= 0;)
302 *ip++ = 0;
303 for (n = number, w = &worm[0]; --n >= 0; w++) {
304 w->orientation = w->head = 0;
305 if (!(ip = malloc((size_t)(length * sizeof(short)))))
306 nomem();
307 w->xpos = ip;
308 for (x = length; --x >= 0;)
309 *ip++ = -1;
310 if (!(ip = malloc((size_t)(length * sizeof(short)))))
311 nomem();
312 w->ypos = ip;
313 for (y = length; --y >= 0;)
314 *ip++ = -1;
315 }
316
317 (void)signal(SIGHUP, onsig);
318 (void)signal(SIGINT, onsig);
319 (void)signal(SIGQUIT, onsig);
320 (void)signal(SIGTSTP, onsig);
321 (void)signal(SIGTERM, onsig);
322
323 if (field) {
324 const char *p = field;
325
326 for (y = LI; --y >= 0;) {
327 for (x = CO; --x >= 0;) {
328 addch(*p++);
329 if (!*p)
330 p = field;
331 }
332 refresh();
333 }
334 }
335 for (;;) {
336 refresh();
337 if (sig_caught) {
338 endwin();
339 exit(0);
340 }
341 if (delay) {
342 if (delay % 1000000 != 0)
343 usleep(delay % 1000000);
344 if (delay >= 1000000)
345 sleep(delay / 1000000);
346 }
347 for (n = 0, w = &worm[0]; n < number; n++, w++) {
348 if ((x = w->xpos[h = w->head]) < 0) {
349 mvaddch(y = w->ypos[h] = bottom,
350 x = w->xpos[h] = 0,
351 flavor[n % sizeof(flavor)]);
352 ref[y][x]++;
353 }
354 else
355 y = w->ypos[h];
356 if (++h == length)
357 h = 0;
358 if (w->xpos[w->head = h] >= 0) {
359 int x1, y1;
360
361 x1 = w->xpos[h];
362 y1 = w->ypos[h];
363 if (--ref[y1][x1] == 0) {
364 mvaddch(y1, x1, trail);
365 }
366 }
367
368 op = &(!x
369 ? (!y
370 ? upleft
371 : (y == bottom ? lowleft : left))
372 : (x == last
373 ? (!y ? upright
374 : (y == bottom ? lowright : right))
375 : (!y ? upper
376 : (y == bottom ? lower : normal)))
377 )[w->orientation];
378
379 switch (op->nopts) {
380 case 0:
381 refresh();
382 abort();
383 return(1);
384 case 1:
385 w->orientation = op->opts[0];
386 break;
387 default:
388 w->orientation =
389 op->opts[(int)random() % op->nopts];
390 }
391 mvaddch(y += yinc[w->orientation],
392 x += xinc[w->orientation],
393 flavor[n % sizeof(flavor)]);
394 ref[w->ypos[h] = y][w->xpos[h] = x]++;
395 }
396 }
397 }
398
399 static void
400 onsig(int signo __unused)
401 {
402 sig_caught = 1;
403 }
404
405 /* This is never called before curses is initialised */
406 static void
407 nomem(void)
408 {
409 endwin();
410 errx(1, "not enough memory.");
411 }
412