1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
|
/* $OpenBSD: update.c,v 1.17 2015/12/15 18:39:50 tb Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ed James.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
*
* Copy permission is hereby granted provided that this notice is
* retained on all partial or complete copies.
*
* For more info on this and all of my stuff, mail edjames@berkeley.edu.
*/
#include "include.h"
void
setseed(const char *seed)
{
seeded = 1;
srandom_deterministic(atol(seed));
}
uint32_t
atcrandom()
{
if (seeded)
return random();
else
return arc4random();
}
uint32_t
atcrandom_uniform(uint32_t upper_bound)
{
if (seeded)
return random() % upper_bound;
else
return arc4random_uniform(upper_bound);
}
void
update(int dummy)
{
int i, dir_diff, unclean;
PLANE *pp, *p1, *p2;
clck++;
erase_all();
/* put some planes in the air */
do {
unclean = 0;
for (pp = ground.head; pp != NULL; pp = pp->next) {
if (pp->new_altitude > 0) {
delete(&ground, pp);
append(&air, pp);
unclean = 1;
break;
}
}
} while (unclean);
/* do altitude change and basic movement */
for (pp = air.head; pp != NULL; pp = pp->next) {
/* type 0 only move every other turn */
if (pp->plane_type == 0 && clck & 1)
continue;
pp->fuel--;
if (pp->fuel < 0)
loser(pp, "ran out of fuel.");
pp->altitude += SGN(pp->new_altitude - pp->altitude);
if (!pp->delayd) {
dir_diff = pp->new_dir - pp->dir;
/*
* Allow for circle commands
*/
if (pp->new_dir >= 0 && pp->new_dir < MAXDIR) {
if (dir_diff > MAXDIR/2)
dir_diff -= MAXDIR;
else if (dir_diff < -(MAXDIR/2))
dir_diff += MAXDIR;
}
if (dir_diff > 2)
dir_diff = 2;
else if (dir_diff < -2)
dir_diff = -2;
pp->dir += dir_diff;
if (pp->dir >= MAXDIR)
pp->dir -= MAXDIR;
else if (pp->dir < 0)
pp->dir += MAXDIR;
}
pp->xpos += displacement[pp->dir].dx;
pp->ypos += displacement[pp->dir].dy;
if (pp->delayd && pp->xpos == sp->beacon[pp->delayd_no].x &&
pp->ypos == sp->beacon[pp->delayd_no].y) {
pp->delayd = 0;
if (pp->status == S_UNMARKED)
pp->status = S_MARKED;
}
switch (pp->dest_type) {
case T_AIRPORT:
if (pp->xpos == sp->airport[pp->dest_no].x &&
pp->ypos == sp->airport[pp->dest_no].y &&
pp->altitude == 0) {
if (pp->dir != sp->airport[pp->dest_no].dir)
loser(pp, "landed in the wrong direction.");
else {
pp->status = S_GONE;
continue;
}
}
break;
case T_EXIT:
if (pp->xpos == sp->exit[pp->dest_no].x &&
pp->ypos == sp->exit[pp->dest_no].y) {
if (pp->altitude != 9)
loser(pp, "exited at the wrong altitude.");
else {
pp->status = S_GONE;
continue;
}
}
break;
default:
loser(pp, "has a bizarre destination, get help!");
}
if (pp->altitude > 9)
/* "this is impossible" */
loser(pp, "exceeded flight ceiling.");
if (pp->altitude <= 0) {
for (i = 0; i < sp->num_airports; i++)
if (pp->xpos == sp->airport[i].x &&
pp->ypos == sp->airport[i].y) {
if (pp->dest_type == T_AIRPORT)
loser(pp,
"landed at the wrong airport.");
else
loser(pp,
"landed instead of exited.");
}
loser(pp, "crashed on the ground.");
}
if (pp->xpos < 1 || pp->xpos >= sp->width - 1 ||
pp->ypos < 1 || pp->ypos >= sp->height - 1) {
for (i = 0; i < sp->num_exits; i++)
if (pp->xpos == sp->exit[i].x &&
pp->ypos == sp->exit[i].y) {
if (pp->dest_type == T_EXIT)
loser(pp,
"exited via the wrong exit.");
else
loser(pp,
"exited instead of landed.");
}
loser(pp, "illegally left the flight arena.");
}
}
/*
* Traverse the list once, deleting the planes that are gone.
*/
for (pp = air.head; pp != NULL; pp = p2) {
p2 = pp->next;
if (pp->status == S_GONE) {
safe_planes++;
delete(&air, pp);
}
}
draw_all();
for (p1 = air.head; p1 != NULL; p1 = p1->next)
for (p2 = p1->next; p2 != NULL; p2 = p2->next)
if (too_close(p1, p2, 1)) {
static char buf[80];
(void)snprintf(buf, sizeof buf,
"collided with plane '%c'.",
name(p2));
loser(p1, buf);
}
/*
* Check every other update. Actually, only add on even updates.
* Otherwise, prop jobs show up *on* entrance. Remember that
* we don't update props on odd updates.
*/
if (atcrandom_uniform(sp->newplane_time) == 0)
addplane();
}
const char *
command(PLANE *pp)
{
static char buf[50], *bp, *comm_start;
buf[0] = '\0';
bp = buf;
(void)snprintf(bp, buf + sizeof buf - bp,
"%c%d%c%c%d: ", name(pp), pp->altitude,
(pp->fuel < LOWFUEL) ? '*' : ' ',
(pp->dest_type == T_AIRPORT) ? 'A' : 'E', pp->dest_no);
comm_start = bp = strchr(buf, '\0');
if (pp->altitude == 0)
(void)snprintf(bp, buf + sizeof buf - bp,
"Holding @ A%d", pp->orig_no);
else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
strlcpy(bp, "Circle", buf + sizeof buf - bp);
else if (pp->new_dir != pp->dir)
(void)snprintf(bp, buf + sizeof buf - bp,
"%d", dir_deg(pp->new_dir));
bp = strchr(buf, '\0');
if (pp->delayd)
(void)snprintf(bp, buf + sizeof buf - bp,
" @ B%d", pp->delayd_no);
bp = strchr(buf, '\0');
if (*comm_start == '\0' &&
(pp->status == S_UNMARKED || pp->status == S_IGNORED))
strlcpy(bp, "---------", buf + sizeof buf - bp);
return (buf);
}
char
name(const PLANE *p)
{
if (p->plane_type == 0)
return ('A' + p->plane_no);
else
return ('a' + p->plane_no);
}
int
number(char l)
{
if (l >= 'a' && l <= 'z')
return (l - 'a');
else if (l >= 'A' && l <= 'Z')
return (l - 'A');
else
return (-1);
}
int
next_plane(void)
{
static int last_plane = -1;
PLANE *pp;
int found, start_plane = last_plane;
do {
found = 0;
last_plane++;
if (last_plane >= 26)
last_plane = 0;
for (pp = air.head; pp != NULL; pp = pp->next)
if (pp->plane_no == last_plane) {
found++;
break;
}
if (!found)
for (pp = ground.head; pp != NULL; pp = pp->next)
if (pp->plane_no == last_plane) {
found++;
break;
}
} while (found && last_plane != start_plane);
if (last_plane == start_plane)
return (-1);
return (last_plane);
}
int
addplane(void)
{
PLANE p, *pp, *p1;
int i, num_starts, close, rnd, rnd2, pnum;
memset(&p, 0, sizeof (p));
p.status = S_MARKED;
p.plane_type = atcrandom_uniform(2);
num_starts = sp->num_exits + sp->num_airports;
rnd = atcrandom_uniform(num_starts);
if (rnd < sp->num_exits) {
p.dest_type = T_EXIT;
p.dest_no = rnd;
} else {
p.dest_type = T_AIRPORT;
p.dest_no = rnd - sp->num_exits;
}
/* loop until we get a plane not near another */
for (i = 0; i < num_starts; i++) {
/* loop till we get a different start point */
while ((rnd2 = atcrandom_uniform(num_starts)) == rnd)
;
if (rnd2 < sp->num_exits) {
p.orig_type = T_EXIT;
p.orig_no = rnd2;
p.xpos = sp->exit[rnd2].x;
p.ypos = sp->exit[rnd2].y;
p.new_dir = p.dir = sp->exit[rnd2].dir;
p.altitude = p.new_altitude = 7;
close = 0;
for (p1 = air.head; p1 != NULL; p1 = p1->next)
if (too_close(p1, &p, 4)) {
close++;
break;
}
if (close)
continue;
} else {
p.orig_type = T_AIRPORT;
p.orig_no = rnd2 - sp->num_exits;
p.xpos = sp->airport[p.orig_no].x;
p.ypos = sp->airport[p.orig_no].y;
p.new_dir = p.dir = sp->airport[p.orig_no].dir;
p.altitude = p.new_altitude = 0;
}
p.fuel = sp->width + sp->height;
break;
}
if (i >= num_starts)
return (-1);
pnum = next_plane();
if (pnum < 0)
return (-1);
p.plane_no = pnum;
pp = newplane();
memcpy(pp, &p, sizeof (p));
if (pp->orig_type == T_AIRPORT)
append(&ground, pp);
else
append(&air, pp);
return (pp->dest_type);
}
PLANE *
findplane(int n)
{
PLANE *pp;
for (pp = air.head; pp != NULL; pp = pp->next)
if (pp->plane_no == n)
return (pp);
for (pp = ground.head; pp != NULL; pp = pp->next)
if (pp->plane_no == n)
return (pp);
return (NULL);
}
int
too_close(const PLANE *p1, const PLANE *p2, int dist)
{
if (ABS(p1->altitude - p2->altitude) <= dist &&
ABS(p1->xpos - p2->xpos) <= dist && ABS(p1->ypos - p2->ypos) <= dist)
return (1);
else
return (0);
}
int
dir_deg(int d)
{
switch (d) {
case 0: return (0);
case 1: return (45);
case 2: return (90);
case 3: return (135);
case 4: return (180);
case 5: return (225);
case 6: return (270);
case 7: return (315);
default:
return (-1);
}
}
|