aboutsummaryrefslogtreecommitdiff
path: root/games/bs/bs.c
blob: c6d9c4ebdf457390e1a535ead5f5fd1bd6d10b19 (plain) (blame)
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
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
/*
 * bs.c - original author: Bruce Holloway
 *		salvo option by: Chuck A DeGaul
 * with improved user interface, autoconfiguration and code cleanup
 *		by Eric S. Raymond <esr@snark.thyrsus.com>
 * v1.2 with color support and minor portability fixes, November 1990
 * v2.0 featuring strict ANSI/POSIX conformance, November 1993.
 */

#include <ncurses.h>
#include <signal.h>
#include <ctype.h>
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <string.h>

#ifndef A_UNDERLINE	/* BSD curses */
#define	beep()	write(1,"\007",1);
#define	cbreak	crmode
#define	saveterm savetty
#define	resetterm resetty
#define	nocbreak nocrmode
#define strchr	index
#endif /* !A_UNDERLINE */

static bool checkplace();

/*
 * Constants for tuning the random-fire algorithm. It prefers moves that
 * diagonal-stripe the board with a stripe separation of srchstep. If
 * no such preferred moves are found, srchstep is decremented.
 */
#define BEGINSTEP	3	/* initial value of srchstep */

/* miscellaneous constants */
#define SHIPTYPES	5
#define	OTHER		(1-turn)
#define PLAYER		0
#define COMPUTER	1
#define MARK_HIT	'H'
#define MARK_MISS	'o'
#define CTRLC		'\003'	/* used as terminate command */
#define FF		'\014'	/* used as redraw command */

/* coordinate handling */
#define BWIDTH		10
#define BDEPTH		10

/* display symbols */
#define SHOWHIT		'*'
#define SHOWSPLASH	' '
#define IS_SHIP(c)	isupper(c)

/* how to position us on player board */
#define PYBASE	3
#define PXBASE	3
#define PY(y)	(PYBASE + (y))
#define PX(x)	(PXBASE + (x)*3)
#define pgoto(y, x)	(void)move(PY(y), PX(x))

/* how to position us on cpu board */
#define CYBASE	3
#define CXBASE	48
#define CY(y)	(CYBASE + (y))
#define CX(x)	(CXBASE + (x)*3)
#define cgoto(y, x)	(void)move(CY(y), CX(x))

#define ONBOARD(x, y)	(x >= 0 && x < BWIDTH && y >= 0 && y < BDEPTH)

/* other board locations */
#define COLWIDTH	80
#define PROMPTLINE	21			/* prompt line */
#define SYBASE		CYBASE + BDEPTH + 3	/* move key diagram */
#define SXBASE		63
#define MYBASE		SYBASE - 1		/* diagram caption */
#define MXBASE		64
#define HYBASE		SYBASE - 1		/* help area */
#define HXBASE		0

/* this will need to be changed if BWIDTH changes */
static char numbers[] = "   0  1  2  3  4  5  6  7  8  9";

static char carrier[] = "Aircraft Carrier";
static char battle[] = "Battleship";
static char sub[] = "Submarine";
static char destroy[] = "Destroyer";
static char ptboat[] = "PT Boat";

static char name[40];
static char dftname[] = "stranger";

/* direction constants */
#define E	0
#define SE	1
#define S	2
#define SW	3
#define W	4
#define NW	5
#define N	6
#define NE	7
static int xincr[8] = {1,  1,  0, -1, -1, -1,  0,  1};
static int yincr[8] = {0,  1,  1,  1,  0, -1, -1, -1};

/* current ship position and direction */
static int curx = (BWIDTH / 2);
static int cury = (BDEPTH / 2);

typedef struct
{
    char *name;		/* name of the ship type */
    unsigned hits;	/* how many times has this ship been hit? */
    char symbol;	/* symbol for game purposes */
    char length;	/* length of ship */
    char x, y;		/* coordinates of ship start point */
    char dir;		/* direction of `bow' */
    bool placed;	/* has it been placed on the board? */
}
ship_t;

ship_t plyship[SHIPTYPES] =
{
    { carrier,	0, 'A', 5},
    { battle,	0, 'B', 4},
    { destroy,	0, 'D', 3},
    { sub,	0, 'S', 3},
    { ptboat,	0, 'P', 2},
};

ship_t cpuship[SHIPTYPES] =
{
    { carrier,	0, 'A', 5},
    { battle,	0, 'B', 4},
    { destroy,	0, 'D', 3},
    { sub,	0, 'S', 3},
    { ptboat,	0, 'P', 2},
};

/* "Hits" board, and main board. */
static char hits[2][BWIDTH][BDEPTH], board[2][BWIDTH][BDEPTH];

static int turn;			/* 0=player, 1=computer */
static int plywon=0, cpuwon=0;		/* How many games has each won? */

static int salvo, blitz, closepack;

#define	PR	(void)addstr

static void uninitgame(sig)
/* end the game, either normally or due to signal */
int	sig;
{
    clear();
    (void)refresh();
    (void)resetterm();
    (void)echo();
    (void)endwin();
    exit(0);
}

static void announceopts()
/* announce which game options are enabled */
{
    if (salvo || blitz || closepack)
    {
	(void) printw("Playing optional game (");
	if (salvo)
	    (void) printw("salvo, ");
	else
	    (void) printw("nosalvo, ");
	if (blitz)
	    (void) printw("blitz ");
	else
	    (void) printw("noblitz, ");
	if (closepack)
	    (void) printw("closepack)");
	else
	    (void) printw("noclosepack)");
    }
    else
	(void) printw(
	"Playing standard game (noblitz, nosalvo, noclosepack)");
}

static void intro()
{
    extern char *getlogin();
    char *tmpname;

    srandomdev();

    (void) signal(SIGINT,uninitgame);
    (void) signal(SIGINT,uninitgame);
    (void) signal(SIGIOT,uninitgame);		/* for assert(3) */
    if(signal(SIGQUIT,SIG_IGN) != SIG_IGN)
	(void)signal(SIGQUIT,uninitgame);

    if(tmpname = getlogin())
    {
	(void)strcpy(name,tmpname);
	name[0] = toupper(name[0]);
    }
    else
	(void)strcpy(name,dftname);

    (void)initscr();
#ifdef KEY_MIN
    keypad(stdscr, TRUE);
#endif /* KEY_MIN */
    (void)saveterm();
    (void)nonl();
    (void)cbreak();
    (void)noecho();

#ifdef PENGUIN
    (void)clear();
    (void)mvaddstr(4,29,"Welcome to Battleship!");
    (void)move(8,0);
    PR("                                                  \\\n");
    PR("                           \\                     \\ \\\n");
    PR("                          \\ \\                   \\ \\ \\_____________\n");
    PR("                         \\ \\ \\_____________      \\ \\/            |\n");
    PR("                          \\ \\/             \\      \\/             |\n");
    PR("                           \\/               \\_____/              |__\n");
    PR("           ________________/                                       |\n");
    PR("           \\  S.S. Penguin                                         |\n");
    PR("            \\                                                     /\n");
    PR("             \\___________________________________________________/\n");

    (void) mvaddstr(22,27,"Hit any key to continue..."); (void)refresh();
    (void) getch();
#endif /* PENGUIN */

#ifdef A_COLOR
    start_color();

    init_pair(COLOR_BLACK, COLOR_BLACK, COLOR_BLACK);
    init_pair(COLOR_GREEN, COLOR_GREEN, COLOR_BLACK);
    init_pair(COLOR_RED, COLOR_RED, COLOR_BLACK);
    init_pair(COLOR_CYAN, COLOR_CYAN, COLOR_BLACK);
    init_pair(COLOR_WHITE, COLOR_WHITE, COLOR_BLACK);
    init_pair(COLOR_MAGENTA, COLOR_MAGENTA, COLOR_BLACK);
    init_pair(COLOR_BLUE, COLOR_BLUE, COLOR_BLACK);
    init_pair(COLOR_YELLOW, COLOR_YELLOW, COLOR_BLACK);
#endif /* A_COLOR */

}

/* VARARGS1 */
static void prompt(n, f, s)
/* print a message at the prompt line */
int n;
char *f, *s;
{
    (void) move(PROMPTLINE + n, 0);
    (void) clrtoeol();
    (void) printw(f, s);
    (void) refresh();
}

static void error(s)
char *s;
{
    (void) move(PROMPTLINE + 2, 0);
    (void) clrtoeol();
    if (s)
    {
	(void) addstr(s);
	(void) beep();
    }
}

static void placeship(b, ss, vis)
int b;
ship_t *ss;
int vis;
{
    int l;

    for(l = 0; l < ss->length; ++l)
    {
	int newx = ss->x + l * xincr[ss->dir];
	int newy = ss->y + l * yincr[ss->dir];

	board[b][newx][newy] = ss->symbol;
	if (vis)
	{
	    pgoto(newy, newx);
	    (void) addch((chtype)ss->symbol);
	}
    }
    ss->hits = 0;
}

static int rnd(n)
int n;
{
    return(random() % n);
}

static void randomplace(b, ss)
/* generate a valid random ship placement into px,py */
int b;
ship_t *ss;
{
    register int bwidth = BWIDTH - ss->length;
    register int bdepth = BDEPTH - ss->length;

    do {
	ss->y = rnd(bdepth);
	ss->x = rnd(bwidth);
	ss->dir = rnd(2) ? E : S;
    } while
	(!checkplace(b, ss, FALSE));
}

static void initgame()
{
    int i, j, unplaced;
    ship_t *ss;

    (void) clear();
    (void) mvaddstr(0,35,"BATTLESHIPS");
    (void) move(PROMPTLINE + 2, 0);
    announceopts();

    bzero(board, sizeof(char) * BWIDTH * BDEPTH * 2);
    bzero(hits, sizeof(char) * BWIDTH * BDEPTH * 2);
    for (i = 0; i < SHIPTYPES; i++)
    {
	ss = cpuship + i;
	ss->x = ss->y = ss->dir = ss->hits = ss->placed = 0;
	ss = plyship + i;
	ss->x = ss->y = ss->dir = ss->hits = ss->placed = 0;
    }

    /* draw empty boards */
    (void) mvaddstr(PYBASE - 2, PXBASE + 5, "Main Board");
    (void) mvaddstr(PYBASE - 1, PXBASE - 3,numbers);
    for(i=0; i < BDEPTH; ++i)
    {
	(void) mvaddch(PYBASE + i, PXBASE - 3, i + 'A');
#ifdef A_COLOR
	if (has_colors())
	    attron(COLOR_PAIR(COLOR_BLUE));
#endif /* A_COLOR */
	(void) addch(' ');
	for (j = 0; j < BWIDTH; j++)
	    (void) addstr(" . ");
#ifdef A_COLOR
	attrset(0);
#endif /* A_COLOR */
	(void) addch(' ');
	(void) addch(i + 'A');
    }
    (void) mvaddstr(PYBASE + BDEPTH, PXBASE - 3,numbers);
    (void) mvaddstr(CYBASE - 2, CXBASE + 7,"Hit/Miss Board");
    (void) mvaddstr(CYBASE - 1, CXBASE - 3, numbers);
    for(i=0; i < BDEPTH; ++i)
    {
	(void) mvaddch(CYBASE + i, CXBASE - 3, i + 'A');
#ifdef A_COLOR
	if (has_colors())
	    attron(COLOR_PAIR(COLOR_BLUE));
#endif /* A_COLOR */
	(void) addch(' ');
	for (j = 0; j < BWIDTH; j++)
	    (void) addstr(" . ");
#ifdef A_COLOR
	attrset(0);
#endif /* A_COLOR */
	(void) addch(' ');
	(void) addch(i + 'A');
    }

    (void) mvaddstr(CYBASE + BDEPTH,CXBASE - 3,numbers);

    (void) mvprintw(HYBASE,  HXBASE,
		    "To position your ships: move the cursor to a spot, then");
    (void) mvprintw(HYBASE+1,HXBASE,
		    "type the first letter of a ship type to select it, then");
    (void) mvprintw(HYBASE+2,HXBASE,
		    "type a direction ([hjkl] or [4862]), indicating how the");
    (void) mvprintw(HYBASE+3,HXBASE,
		    "ship should be pointed. You may also type a ship letter");
    (void) mvprintw(HYBASE+4,HXBASE,
		    "followed by `r' to position it randomly, or type `R' to");
    (void) mvprintw(HYBASE+5,HXBASE,
		    "place all remaining ships randomly.");

    (void) mvaddstr(MYBASE,   MXBASE, "Aiming keys:");
    (void) mvaddstr(SYBASE,   SXBASE, "y k u    7 8 9");
    (void) mvaddstr(SYBASE+1, SXBASE, " \\|/      \\|/ ");
    (void) mvaddstr(SYBASE+2, SXBASE, "h-+-l    4-+-6");
    (void) mvaddstr(SYBASE+3, SXBASE, " /|\\      /|\\ ");
    (void) mvaddstr(SYBASE+4, SXBASE, "b j n    1 2 3");

    /* have the computer place ships */
    for(ss = cpuship; ss < cpuship + SHIPTYPES; ss++)
    {
	randomplace(COMPUTER, ss);
	placeship(COMPUTER, ss, FALSE);
    }

    ss = (ship_t *)NULL;
    do {
	extern char *strchr();
	static char getcoord();
	char c, docked[SHIPTYPES + 2], *cp = docked;

	/* figure which ships still wait to be placed */
	*cp++ = 'R';
	for (i = 0; i < SHIPTYPES; i++)
	    if (!plyship[i].placed)
		*cp++ = plyship[i].symbol;
	*cp = '\0';

	/* get a command letter */
	prompt(1, "Type one of [%s] to pick a ship.", docked+1);
	do {
	    c = getcoord(PLAYER);
	} while
	    (!strchr(docked, c));

	if (c == 'R')
	    (void) ungetch('R');
	else
	{
	    /* map that into the corresponding symbol */
	    for (ss = plyship; ss < plyship + SHIPTYPES; ss++)
		if (ss->symbol == c)
		    break;

	    prompt(1, "Type one of [hjklrR] to place your %s.", ss->name);
	    pgoto(cury, curx);
	}

	do {
	    c = getch();
	} while
	    (!strchr("hjklrR", c) || c == FF);

	if (c == FF)
	{
	    (void)clearok(stdscr, TRUE);
	    (void)refresh();
	}
	else if (c == 'r')
	{
	    prompt(1, "Random-placing your %s", ss->name);
	    randomplace(PLAYER, ss);
	    placeship(PLAYER, ss, TRUE);
	    error((char *)NULL);
	    ss->placed = TRUE;
	}
	else if (c == 'R')
	{
	    prompt(1, "Placing the rest of your fleet at random...");
	    for (ss = plyship; ss < plyship + SHIPTYPES; ss++)
		if (!ss->placed)
		{
		    randomplace(PLAYER, ss);
		    placeship(PLAYER, ss, TRUE);
		    ss->placed = TRUE;
		}
	    error((char *)NULL);
	}
	else if (strchr("hjkl8462", c))
	{
	    ss->x = curx;
	    ss->y = cury;

	    switch(c)
	    {
	    case 'k': case '8': ss->dir = N; break;
	    case 'j': case '2': ss->dir = S; break;
	    case 'h': case '4': ss->dir = W; break;
	    case 'l': case '6': ss->dir = E; break;
	    }

	    if (checkplace(PLAYER, ss, TRUE))
	    {
		placeship(PLAYER, ss, TRUE);
		error((char *)NULL);
		ss->placed = TRUE;
	    }
	}

	for (unplaced = i = 0; i < SHIPTYPES; i++)
	    unplaced += !plyship[i].placed;
    } while
	(unplaced);

    turn = rnd(2);

    (void) mvprintw(HYBASE,  HXBASE,
		    "To fire, move the cursor to your chosen aiming point   ");
    (void) mvprintw(HYBASE+1,  HXBASE,
		    "and strike any key other than a motion key.            ");
    (void) mvprintw(HYBASE+2,  HXBASE,
		    "                                                       ");
    (void) mvprintw(HYBASE+3,  HXBASE,
		    "                                                       ");
    (void) mvprintw(HYBASE+4,  HXBASE,
		    "                                                       ");
    (void) mvprintw(HYBASE+5,  HXBASE,
		    "                                                       ");

    (void) prompt(0, "Press any key to start...");
    (void) getch();
}

static int getcoord(atcpu)
int atcpu;
{
    int ny, nx, c;

    if (atcpu)
	cgoto(cury,curx);
    else
	pgoto(cury, curx);
    (void)refresh();
    for (;;)
    {
	if (atcpu)
	{
	    (void) mvprintw(CYBASE + BDEPTH+1, CXBASE+11, "(%d, %c)", curx, 'A'+cury);
	    cgoto(cury, curx);
	}
	else
	{
	    (void) mvprintw(PYBASE + BDEPTH+1, PXBASE+11, "(%d, %c)", curx, 'A'+cury);
	    pgoto(cury, curx);
	}

	switch(c = getch())
	{
	case 'k': case '8':
#ifdef KEY_MIN
	case KEY_UP:
#endif /* KEY_MIN */
	    ny = cury+BDEPTH-1; nx = curx;
	    break;
	case 'j': case '2':
#ifdef KEY_MIN
	case KEY_DOWN:
#endif /* KEY_MIN */
	    ny = cury+1;        nx = curx;
	    break;
	case 'h': case '4':
#ifdef KEY_MIN
	case KEY_LEFT:
#endif /* KEY_MIN */
	    ny = cury;          nx = curx+BWIDTH-1;
	    break;
	case 'l': case '6':
#ifdef KEY_MIN
	case KEY_RIGHT:
#endif /* KEY_MIN */
	    ny = cury;          nx = curx+1;
	    break;
	case 'y': case '7':
#ifdef KEY_MIN
	case KEY_A1:
#endif /* KEY_MIN */
	    ny = cury+BDEPTH-1; nx = curx+BWIDTH-1;
	    break;
	case 'b': case '1':
#ifdef KEY_MIN
	case KEY_C1:
#endif /* KEY_MIN */
	    ny = cury+1;        nx = curx+BWIDTH-1;
	    break;
	case 'u': case '9':
#ifdef KEY_MIN
	case KEY_A3:
#endif /* KEY_MIN */
	    ny = cury+BDEPTH-1; nx = curx+1;
	    break;
	case 'n': case '3':
#ifdef KEY_MIN
	case KEY_C3:
#endif /* KEY_MIN */
	    ny = cury+1;        nx = curx+1;
	    break;
	case FF:
	    nx = curx; ny = cury;
	    (void)clearok(stdscr, TRUE);
	    (void)refresh();
	    break;
	default:
	    if (atcpu)
		(void) mvaddstr(CYBASE + BDEPTH + 1, CXBASE + 11, "      ");
	    else
		(void) mvaddstr(PYBASE + BDEPTH + 1, PXBASE + 11, "      ");
	    return(c);
	}

	curx = nx % BWIDTH;
	cury = ny % BDEPTH;
    }
}

static int collidecheck(b, y, x)
/* is this location on the selected zboard adjacent to a ship? */
int b;
int y, x;
{
    int	collide;

    /* anything on the square */
    if (collide = IS_SHIP(board[b][x][y]))
	return(collide);

    /* anything on the neighbors */
    if (!closepack)
    {
	int i;

	for (i = 0; i < 8; i++)
	{
	    int xend, yend;

	    yend = y + yincr[i];
	    xend = x + xincr[i];
	    if (ONBOARD(xend, yend))
		collide += IS_SHIP(board[b][xend][yend]);
	}
    }
    return(collide);
}

static bool checkplace(b, ss, vis)
int b;
ship_t *ss;
int vis;
{
    int l, xend, yend;

    /* first, check for board edges */
    xend = ss->x + ss->length * xincr[ss->dir];
    yend = ss->y + ss->length * yincr[ss->dir];
    if (!ONBOARD(xend, yend))
    {
	if (vis)
	    switch(rnd(3))
	    {
	    case 0:
		error("Ship is hanging from the edge of the world");
		break;
	    case 1:
		error("Try fitting it on the board");
		break;
	    case 2:
		error("Figure I won't find it if you put it there?");
		break;
	    }
	return(0);
    }

    for(l = 0; l < ss->length; ++l)
    {
	if(collidecheck(b, ss->y+l*yincr[ss->dir], ss->x+l*xincr[ss->dir]))
	{
	    if (vis)
		switch(rnd(3))
		{
		    case 0:
			error("There's already a ship there");
			break;
		    case 1:
			error("Collision alert!  Aaaaaagh!");
			break;
		    case 2:
			error("Er, Admiral, what about the other ship?");
			break;
		    }
	    return(FALSE);
	    }
	}
    return(TRUE);
}

static int awinna()
{
    int i, j;
    ship_t *ss;

    for(i=0; i<2; ++i)
    {
	ss = (i) ? cpuship : plyship;
	for(j=0; j < SHIPTYPES; ++j, ++ss)
	    if(ss->length > ss->hits)
		break;
	if (j == SHIPTYPES)
	    return(OTHER);
    }
    return(-1);
}

static ship_t *hitship(x, y)
/* register a hit on the targeted ship */
int x, y;
{
    ship_t *sb, *ss;
    char sym;
    int oldx, oldy;

    getyx(stdscr, oldy, oldx);
    sb = (turn) ? plyship : cpuship;
    if(!(sym = board[OTHER][x][y]))
	return((ship_t *)NULL);
    for(ss = sb; ss < sb + SHIPTYPES; ++ss)
	if(ss->symbol == sym)
	{
	    if (++ss->hits < ss->length)	/* still afloat? */
		return((ship_t *)NULL);
	    else				/* sunk! */
	    {
		int i, j;

		if (!closepack)
		    for (j = -1; j <= 1; j++)
		    {
			int bx = ss->x + j * xincr[(ss->dir + 2) % 8];
			int by = ss->y + j * yincr[(ss->dir + 2) % 8];

			for (i = -1; i <= ss->length; ++i)
			{
			    int x, y;

			    x = bx + i * xincr[ss->dir];
			    y = by + i * yincr[ss->dir];
			    if (ONBOARD(x, y))
			    {
				hits[turn][x][y] = MARK_MISS;
				if (turn % 2 == PLAYER)
				{
				    cgoto(y, x);
#ifdef A_COLOR
				    if (has_colors())
					attron(COLOR_PAIR(COLOR_GREEN));
#endif /* A_COLOR */
				    (void)addch(MARK_MISS);
#ifdef A_COLOR
				    attrset(0);
#endif /* A_COLOR */
				}
			    }
			}
		    }

		for (i = 0; i < ss->length; ++i)
		{
		    int x = ss->x + i * xincr[ss->dir];
		    int y = ss->y + i * yincr[ss->dir];

		    hits[turn][x][y] = ss->symbol;
		    if (turn % 2 == PLAYER)
		    {
			cgoto(y, x);
			(void) addch(ss->symbol);
		    }
		}

		(void) move(oldy, oldx);
		return(ss);
	    }
	}
    (void) move(oldy, oldx);
    return((ship_t *)NULL);
}

static int plyturn()
{
    ship_t *ss;
    bool hit;
    char *m;

    prompt(1, "Where do you want to shoot? ");
    for (;;)
    {
	(void) getcoord(COMPUTER);
	if (hits[PLAYER][curx][cury])
	{
	    prompt(1, "You shelled this spot already! Try again.");
	    beep();
	}
	else
	    break;
    }
    hit = IS_SHIP(board[COMPUTER][curx][cury]);
    hits[PLAYER][curx][cury] = hit ? MARK_HIT : MARK_MISS;
    cgoto(cury, curx);
#ifdef A_COLOR
    if (has_colors())
	if (hit)
	    attron(COLOR_PAIR(COLOR_RED));
	else
	    attron(COLOR_PAIR(COLOR_GREEN));
#endif /* A_COLOR */
    (void) addch((chtype)hits[PLAYER][curx][cury]);
#ifdef A_COLOR
    attrset(0);
#endif /* A_COLOR */

    prompt(1, "You %s.", hit ? "scored a hit" : "missed");
    if(hit && (ss = hitship(curx, cury)))
    {
	switch(rnd(5))
	{
	case 0:
	    m = " You sank my %s!";
	    break;
	case 1:
	    m = " I have this sinking feeling about my %s....";
	    break;
	case 2:
	    m = " My %s has gone to Davy Jones's locker!";
	    break;
	case 3:
	    m = " Glub, glub -- my %s is headed for the bottom!";
	    break;
	case 4:
	    m = " You'll pick up survivors from my my %s, I hope...!";
	    break;
	}
	(void)printw(m, ss->name);
	(void)beep();
	return(awinna() == -1);
    }
    return(hit);
}

static int sgetc(s)
char *s;
{
    char *s1;
    int ch;

    (void)refresh();
    for(;;)
    {
	ch = getch();
	if (islower(ch))
	    ch = toupper(ch);
	if (ch == CTRLC)
	    uninitgame();
	for (s1=s; *s1 && ch != *s1; ++s1)
	    continue;
	if (*s1)
	{
	    (void) addch((chtype)ch);
	    (void)refresh();
	    return(ch);
	    }
	}
}


static void randomfire(px, py)
/* random-fire routine -- implements simple diagonal-striping strategy */
int	*px, *py;
{
    static int turncount = 0;
    static int srchstep = BEGINSTEP;
    static int huntoffs;		/* Offset on search strategy */
    int ypossible[BWIDTH * BDEPTH], xpossible[BWIDTH * BDEPTH], nposs;
    int ypreferred[BWIDTH * BDEPTH], xpreferred[BWIDTH * BDEPTH], npref;
    int x, y, i;

    if (turncount++ == 0)
	huntoffs = rnd(srchstep);

    /* first, list all possible moves */
    nposs = npref = 0;
    for (x = 0; x < BWIDTH; x++)
	for (y = 0; y < BDEPTH; y++)
	    if (!hits[COMPUTER][x][y])
	    {
		xpossible[nposs] = x;
		ypossible[nposs] = y;
		nposs++;
		if (((x+huntoffs) % srchstep) != (y % srchstep))
		{
		    xpreferred[npref] = x;
		    ypreferred[npref] = y;
		    npref++;
		}
	    }

    if (npref)
    {
	i = rnd(npref);

	*px = xpreferred[i];
	*py = ypreferred[i];
    }
    else if (nposs)
    {
	i = rnd(nposs);

	*px = xpossible[i];
	*py = ypossible[i];

	if (srchstep > 1)
	    --srchstep;
    }
    else
    {
	error("No moves possible?? Help!");
	exit(1);
	/*NOTREACHED*/
    }
}

#define S_MISS	0
#define S_HIT	1
#define S_SUNK	-1

static bool cpufire(x, y)
/* fire away at given location */
int	x, y;
{
    bool hit, sunk;
    ship_t *ss;

    hits[COMPUTER][x][y] = (hit = (board[PLAYER][x][y])) ? MARK_HIT : MARK_MISS;
    (void) mvprintw(PROMPTLINE, 0,
	"I shoot at %c%d. I %s!", y + 'A', x, hit ? "hit" : "miss");
    if (sunk = (hit && (ss = hitship(x, y))))
	(void) printw(" I've sunk your %s", ss->name);
    (void)clrtoeol();

    pgoto(y, x);
#ifdef A_COLOR
    if (has_colors())
	if (hit)
	    attron(COLOR_PAIR(COLOR_RED));
	else
	    attron(COLOR_PAIR(COLOR_GREEN));
#endif /* A_COLOR */
    (void)addch((chtype)(hit ? SHOWHIT : SHOWSPLASH));
#ifdef A_COLOR
    attrset(0);
#endif /* A_COLOR */

    return(hit ? (sunk ? S_SUNK : S_HIT) : S_MISS);
}

/*
 * This code implements a fairly irregular FSM, so please forgive the rampant
 * unstructuredness below. The five labels are states which need to be held
 * between computer turns.
 */
static bool cputurn()
{
#define POSSIBLE(x, y)	(ONBOARD(x, y) && !hits[COMPUTER][x][y])
#define RANDOM_FIRE	0
#define RANDOM_HIT	1
#define HUNT_DIRECT	2
#define FIRST_PASS	3
#define REVERSE_JUMP	4
#define SECOND_PASS	5
    static int next = RANDOM_FIRE;
    static bool used[4];
    static ship_t ts;
    int navail, x, y, d, n, hit = S_MISS;

    switch(next)
    {
    case RANDOM_FIRE:	/* last shot was random and missed */
    refire:
	randomfire(&x, &y);
	if (!(hit = cpufire(x, y)))
	    next = RANDOM_FIRE;
	else
	{
	    ts.x = x; ts.y = y;
	    ts.hits = 1;
	    next = (hit == S_SUNK) ? RANDOM_FIRE : RANDOM_HIT;
	}
	break;

    case RANDOM_HIT:	/* last shot was random and hit */
	used[E/2] = used[S/2] = used[W/2] = used[N/2] = FALSE;
	/* FALLTHROUGH */

    case HUNT_DIRECT:	/* last shot hit, we're looking for ship's long axis */
	for (d = navail = 0; d < 4; d++)
	{
	    x = ts.x + xincr[d*2]; y = ts.y + yincr[d*2];
	    if (!used[d] && POSSIBLE(x, y))
		navail++;
	    else
		used[d] = TRUE;
	}
	if (navail == 0)	/* no valid places for shots adjacent... */
	    goto refire;	/* ...so we must random-fire */
	else
	{
	    for (d = 0, n = rnd(navail) + 1; n; n--)
		while (used[d])
		    d++;

	    assert(d <= 4);

	    used[d] = FALSE;
	    x = ts.x + xincr[d*2];
	    y = ts.y + yincr[d*2];

	    assert(POSSIBLE(x, y));

	    if (!(hit = cpufire(x, y)))
		next = HUNT_DIRECT;
	    else
	    {
		ts.x = x; ts.y = y; ts.dir = d*2; ts.hits++;
		next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS;
	    }
	}
	break;

    case FIRST_PASS:	/* we have a start and a direction now */
	x = ts.x + xincr[ts.dir];
	y = ts.y + yincr[ts.dir];
	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
	{
	    ts.x = x; ts.y = y; ts.hits++;
	    next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS;
	}
	else
	    next = REVERSE_JUMP;
	break;

    case REVERSE_JUMP:	/* nail down the ship's other end */
	d = ts.dir + 4;
	x = ts.x + ts.hits * xincr[d];
	y = ts.y + ts.hits * yincr[d];
	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
	{
	    ts.x = x; ts.y = y; ts.dir = d; ts.hits++;
	    next = (hit == S_SUNK) ? RANDOM_FIRE : SECOND_PASS;
	}
	else
	    next = RANDOM_FIRE;
	break;

    case SECOND_PASS:	/* kill squares not caught on first pass */
	x = ts.x + xincr[ts.dir];
	y = ts.y + yincr[ts.dir];
	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
	{
	    ts.x = x; ts.y = y; ts.hits++;
	    next = (hit == S_SUNK) ? RANDOM_FIRE: SECOND_PASS;
	    break;
	}
	else
	    next = RANDOM_FIRE;
	break;
    }

    /* check for continuation and/or winner */
    if (salvo)
    {
	(void)refresh();
	(void)sleep(1);
    }
    if (awinna() != -1)
	return(FALSE);

#ifdef DEBUG
    (void) mvprintw(PROMPTLINE + 2, 0,
		    "New state %d, x=%d, y=%d, d=%d",
		    next, x, y, d);
#endif /* DEBUG */
    return(hit);
}

playagain()
{
    int j;
    ship_t *ss;

    for (ss = cpuship; ss < cpuship + SHIPTYPES; ss++)
	for(j = 0; j < ss->length; j++)
	{
	    cgoto(ss->y + j * yincr[ss->dir], ss->x + j * xincr[ss->dir]);
	    (void)addch((chtype)ss->symbol);
	}

    if(awinna())
	++cpuwon;
    else
	++plywon;
    j = 18 + strlen(name);
    if(plywon >= 10)
	++j;
    if(cpuwon >= 10)
	++j;
    (void) mvprintw(1,(COLWIDTH-j)/2,
		    "%s: %d     Computer: %d",name,plywon,cpuwon);

    prompt(2, (awinna()) ? "Want to be humiliated again, %s [yn]? "
	   : "Going to give me a chance for revenge, %s [yn]? ",name);
    return(sgetc("YN") == 'Y');
}

static void do_options(c,op)
int c;
char *op[];
{
    register int i;

    if (c > 1)
    {
	for (i=1; i<c; i++)
	{
	    switch(op[i][0])
	    {
	    default:
	    case '?':
		(void) fprintf(stderr, "Usage: battle [-s | -b] [-c]\n");
		(void) fprintf(stderr, "\tWhere the options are:\n");
		(void) fprintf(stderr, "\t-s : play a salvo game\n");
		(void) fprintf(stderr, "\t-b : play a blitz game\n");
		(void) fprintf(stderr, "\t-c : ships may be adjacent\n");
		exit(1);
		break;
	    case '-':
		switch(op[i][1])
		{
		case 'b':
		    blitz = 1;
		    if (salvo == 1)
		    {
			(void) fprintf(stderr,
				"Bad Arg: -b and -s are mutually exclusive\n");
			exit(1);
		    }
		    break;
		case 's':
		    salvo = 1;
		    if (blitz == 1)
		    {
			(void) fprintf(stderr,
				"Bad Arg: -s and -b are mutually exclusive\n");
			exit(1);
		    }
		    break;
		case 'c':
		    closepack = 1;
		    break;
		default:
		    (void) fprintf(stderr,
			    "Bad arg: type \"%s ?\" for usage message\n", op[0]);
		    exit(1);
		}
	    }
	}
    }
}

static int scount(who)
int who;
{
    register int i, shots;
    register ship_t *sp;

    if (who)
	sp = cpuship;	/* count cpu shots */
    else
	sp = plyship;	/* count player shots */

    for (i=0, shots = 0; i < SHIPTYPES; i++, sp++)
    {
	if (sp->hits >= sp->length)
	    continue;		/* dead ship */
	else
	    shots++;
    }
    return(shots);
}

main(argc, argv)
int argc;
char *argv[];
{
    /* revoke */
    setgid(getgid());

    do_options(argc, argv);

    intro();
    do {
	initgame();
	while(awinna() == -1)
	{
	    if (!blitz)
	    {
		if (!salvo)
		{
	    	    if(turn)
			(void) cputurn();
		    else
			(void) plyturn();
		}
		else
		{
		    register int i;

		    i = scount(turn);
		    while (i--)
		    {
			if (turn)
			{
			    if (cputurn() && awinna() != -1)
				i = 0;
			}
			else
			{
			    if (plyturn() && awinna() != -1)
				i = 0;
			}
		    }
		}
	    }
	    else
	    	while(turn ? cputurn() : plyturn())
		    continue;
	    turn = OTHER;
	}
    } while
	(playagain());
    uninitgame();
    /*NOTREACHED*/
}

/* bs.c ends here */