worms.c revision 1.24 1 /* $NetBSD: worms.c,v 1.24 2023/04/15 13:00:30 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 1.24 2023/04/15 13:00:30 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 <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 unsigned int delay = 20000;
197
198 length = 16;
199 number = 3;
200 trail = ' ';
201 field = NULL;
202 while ((ch = getopt(argc, argv, "d:fl:n:t")) != -1)
203 switch(ch) {
204 case 'd':
205 if ((delay = (unsigned int)strtoul(optarg, NULL, 10)) < 1 || delay > 1000)
206 errx(1, "invalid delay (1-1000)");
207 delay *= 1000; /* ms -> us */
208 break;
209 case 'f':
210 field = "WORM";
211 break;
212 case 'l':
213 if ((length = atoi(optarg)) < 2 || length > 1024) {
214 errx(1, "invalid length (%d - %d).",
215 2, 1024);
216 }
217 break;
218 case 'n':
219 if ((number = atoi(optarg)) < 1) {
220 errx(1, "invalid number of worms.");
221 }
222 break;
223 case 't':
224 trail = '.';
225 break;
226 case '?':
227 default:
228 (void)fprintf(stderr,
229 "usage: worms [-ft] [-d delay] [-l length] [-n number]\n");
230 exit(1);
231 }
232
233 if (!(worm = calloc((size_t)number, sizeof(struct worm))))
234 nomem();
235 if (!initscr())
236 errx(0, "couldn't initialize screen");
237 curs_set(0);
238 CO = COLS;
239 LI = LINES;
240 last = CO - 1;
241 bottom = LI - 1;
242 if (!(ip = malloc((size_t)(LI * CO * sizeof(short)))))
243 nomem();
244 if (!(ref = malloc((size_t)(LI * sizeof(short *)))))
245 nomem();
246 for (n = 0; n < LI; ++n) {
247 ref[n] = ip;
248 ip += CO;
249 }
250 for (ip = ref[0], n = LI * CO; --n >= 0;)
251 *ip++ = 0;
252 for (n = number, w = &worm[0]; --n >= 0; w++) {
253 w->orientation = w->head = 0;
254 if (!(ip = malloc((size_t)(length * sizeof(short)))))
255 nomem();
256 w->xpos = ip;
257 for (x = length; --x >= 0;)
258 *ip++ = -1;
259 if (!(ip = malloc((size_t)(length * sizeof(short)))))
260 nomem();
261 w->ypos = ip;
262 for (y = length; --y >= 0;)
263 *ip++ = -1;
264 }
265
266 (void)signal(SIGHUP, onsig);
267 (void)signal(SIGINT, onsig);
268 (void)signal(SIGQUIT, onsig);
269 (void)signal(SIGTSTP, onsig);
270 (void)signal(SIGTERM, onsig);
271
272 if (field) {
273 const char *p = field;
274
275 for (y = LI; --y >= 0;) {
276 for (x = CO; --x >= 0;) {
277 addch(*p++);
278 if (!*p)
279 p = field;
280 }
281 refresh();
282 }
283 }
284 for (;;) {
285 refresh();
286 if (sig_caught) {
287 endwin();
288 exit(0);
289 }
290 if (delay) {
291 if (delay % 1000000 != 0)
292 usleep(delay % 1000000);
293 if (delay >= 1000000)
294 sleep(delay / 1000000);
295 }
296 for (n = 0, w = &worm[0]; n < number; n++, w++) {
297 if ((x = w->xpos[h = w->head]) < 0) {
298 mvaddch(y = w->ypos[h] = bottom,
299 x = w->xpos[h] = 0,
300 flavor[n % sizeof(flavor)]);
301 ref[y][x]++;
302 }
303 else
304 y = w->ypos[h];
305 if (++h == length)
306 h = 0;
307 if (w->xpos[w->head = h] >= 0) {
308 int x1, y1;
309
310 x1 = w->xpos[h];
311 y1 = w->ypos[h];
312 if (--ref[y1][x1] == 0) {
313 mvaddch(y1, x1, trail);
314 }
315 }
316 op = &(!x ? (!y ? upleft : (y == bottom ? lowleft : left)) : (x == last ? (!y ? upright : (y == bottom ? lowright : right)) : (!y ? upper : (y == bottom ? lower : normal))))[w->orientation];
317 switch (op->nopts) {
318 case 0:
319 refresh();
320 abort();
321 return(1);
322 case 1:
323 w->orientation = op->opts[0];
324 break;
325 default:
326 w->orientation =
327 op->opts[(int)random() % op->nopts];
328 }
329 mvaddch(y += yinc[w->orientation],
330 x += xinc[w->orientation],
331 flavor[n % sizeof(flavor)]);
332 ref[w->ypos[h] = y][w->xpos[h] = x]++;
333 }
334 }
335 }
336
337 static void
338 onsig(int signo __unused)
339 {
340 sig_caught = 1;
341 }
342
343 static void
344 nomem(void)
345 {
346 errx(1, "not enough memory.");
347 }
348