summaryrefslogtreecommitdiffstats
path: root/mbbsd/ch_go.c
blob: 308061b84707d616e7b9e9de745d3870d8d1a5e4 (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
/* $Id$ */

#include "bbs.h"
#include <sys/socket.h> 

#define BBLANK  (-1)    /* 空白 */
#define BWHITE  (0)     /* 白子, 後手 */
#define BBLACK  (1)     /* 黑子, 先手 */
#define LWHITE  (2)     /* 白空 */
#define LBLACK  (3)     /* 黑空 */

/* only used for communicating */
#define SETHAND (5)    /* 讓子 */
#define CLEAN   (6)    /* 清除死子 */
#define UNCLEAN (7)    /* 清除錯子,重新來過*/
#define CLEANDONE (8)  /* 開始計地 */

#define MAX_TIME (300)

#define BOARD_LINE_ON_SCREEN(X) ((X) + 2)

#define BRDSIZ  (19)    /* 棋盤單邊大小 */

static const char* turn_color[] = { ANSI_COLOR(37;43), ANSI_COLOR(30;43) };

static const rc_t SetHandPoints[] =
{
    /* 1 */ { 0,  0},
    /* 2 */ { 3,  3}, {15, 15},
    /* 3 */ { 3,  3}, { 3, 15}, {15, 15},
    /* 4 */ { 3,  3}, { 3, 15}, {15,  3}, {15, 15},
    /* 5 */ { 3,  3}, { 3, 15}, { 9,  9}, {15,  3}, {15, 15},
    /* 6 */ { 3,  3}, { 3, 15}, { 9,  3}, { 9, 15}, {15,  3}, {15, 15},
    /* 7 */ { 3,  3}, { 3, 15}, { 9,  3}, { 9,  9}, { 9, 15}, {15,  3},
        {15, 15},
    /* 8 */ { 3,  3}, { 3,  9}, { 3, 15}, { 9,  3}, { 9, 15}, {15,  3},
        {15,  9}, {15, 15},
    /* 9 */ { 3,  3}, { 3,  9}, { 3, 15}, { 9,  3}, { 9,  9}, { 9, 15},
        {15,  3}, {15,  9}, {15, 15},
};

typedef char board_t[BRDSIZ][BRDSIZ];
typedef char (*board_p)[BRDSIZ];

typedef struct {
    ChessStepType type;  /* necessary one */
    int           color;
    rc_t          loc;
} go_step_t;
#define RC_T_EQ(X,Y) ((X).r == (Y).r && (X).c == (Y).c)

typedef struct {
    board_t backup_board;
    char    game_end;
    char    clean_end;    /* bit 1 => I, bit 2 => he */
    char    need_redraw;
    float   feed_back;    /* 貼還 */
    int     eaten[2];
    int     backup_eaten[2];
    rc_t    forbidden[2]; /* 打劫之禁手 */
} go_tag_t;
#define GET_TAG(INFO) ((go_tag_t*)(INFO)->tag)

static char * const locE = "ABCDEFGHJKLMNOPQRST";

static void go_init_user(const userinfo_t* uinfo, ChessUser* user);
static void go_init_user_userec(const userec_t* urec, ChessUser* user);
static void go_init_board(board_t board);
static void go_drawline(const ChessInfo* info, int line);
static void go_movecur(int r, int c);
static int  go_prepare_play(ChessInfo* info);
static int  go_process_key(ChessInfo* info, int key, ChessGameResult* result);
static int  go_select(ChessInfo* info, rc_t location,
    ChessGameResult* result);
static void go_prepare_step(ChessInfo* info, const go_step_t* step);
static ChessGameResult go_apply_step(board_t board, const go_step_t* step);
static void go_drawstep(ChessInfo* info, const go_step_t* step);
static ChessGameResult go_post_game(ChessInfo* info);
static void go_gameend(ChessInfo* info, ChessGameResult result);
static void go_genlog(ChessInfo* info, FILE* fp, ChessGameResult result);

static const ChessActions go_actions = {
    &go_init_user,
    &go_init_user_userec,
    (void (*)(void*)) &go_init_board,
    &go_drawline,
    &go_movecur,
    &go_prepare_play,
    &go_process_key,
    &go_select,
    (void (*)(ChessInfo*, const void*)) &go_prepare_step,
    (ChessGameResult (*)(void*, const void*)) &go_apply_step,
    (void (*)(ChessInfo*, const void*)) &go_drawstep,
    &go_post_game,
    &go_gameend,
    &go_genlog
};

static const ChessConstants go_constants = {
    sizeof(go_step_t),
    MAX_TIME,
    BRDSIZ,
    BRDSIZ,
    1,
    "圍棋",
    "photo_go",
#ifdef BN_GOCHESS_LOG
    BN_GOCHESS_LOG,
#else
    NULL,
#endif
    { ANSI_COLOR(37;43), ANSI_COLOR(30;43) },
    { "白棋", "黑棋" },
};

static void
go_sethand(board_t board, int n)
{
    if (n >= 2 && n <= 9) {
    const int lower = n * (n - 1) / 2;
    const int upper = lower + n;
    int i;
    for (i = lower; i < upper; ++i)
        board[SetHandPoints[i].r][SetHandPoints[i].c] = BBLACK;
    }
}

/* 計算某子的氣數, recursion part of go_countlib() */
static int
go_count(board_t board, board_t mark, int x, int y, int color)
{
    static const int diff[][2] = {
    {1, 0}, {-1, 0}, {0, 1}, {0, -1}
    };
    int i;
    int total = 0;

    mark[x][y] = 0;

    for (i = 0; i < 4; ++i) {
    int xx = x + diff[i][0];
    int yy = y + diff[i][1];

    if (xx >= 0 && xx < BRDSIZ && yy >= 0 && yy < BRDSIZ) {
        if (board[xx][yy] == BBLANK && mark[xx][yy]) {
        ++total;
        mark[xx][yy] = 0;
        } else if (board[xx][yy] == color && mark[xx][yy])
        total += go_count(board, mark, xx, yy, color);
    }
    }

    return total;
}

/* 計算某子的氣數 */
static int
go_countlib(board_t board, int x, int y, char color)
{
    int i, j;
    board_t mark;

    for (i = 0; i < BRDSIZ; i++)
    for (j = 0; j < BRDSIZ; j++)
        mark[i][j] = 1;

    return go_count(board, mark, x, y, color);
}

/* 計算盤面上每個子的氣數 */
static void 
go_eval(board_t board, int lib[][BRDSIZ], char color)
{
    int i, j;

    for (i = 0; i < 19; i++)
    for (j = 0; j < 19; j++)
        if (board[i][j] == color)
        lib[i][j] = go_countlib(board, i, j, color);
}

/* 檢查一步是否合法 */
static int 
go_check(ChessInfo* info, const go_step_t* step)
{
    board_p board = (board_p) info->board;
    int lib = go_countlib(board, step->loc.r, step->loc.c, step->color);

    if (lib == 0) {
    int i, j;
    int board_lib[BRDSIZ][BRDSIZ];
    go_tag_t* tag = (go_tag_t*) info->tag;

    board[step->loc.r][step->loc.c] = step->color;
    go_eval(board, board_lib, !step->color);
    board[step->loc.r][step->loc.c] = BBLANK;   /* restore to open */

    lib = 0;
    for (i = 0; i < BRDSIZ; i++)
        for (j = 0; j < BRDSIZ; j++)
        if (board[i][j] == !step->color && !board_lib[i][j])
            ++lib;

    if (lib == 0 ||
        (lib == 1 && RC_T_EQ(step->loc, tag->forbidden[step->color])))
        return 0;
    else
        return 1;
    } else
    return 1;
}

/* Clean up the dead chess of color `color,' summarize number of
 * eaten chesses and set the forbidden point.
 *
 * `info' might be NULL which means no forbidden point check is
 * needed and don't have to count the number of eaten chesses.
 *
 * Return: 1 if any chess of color `color' was eaten; 0 otherwise. */
static int
go_examboard(board_t board, int color, ChessInfo* info)
{
    int i, j, n;
    int lib[BRDSIZ][BRDSIZ];

    rc_t  dummy_rc;
    rc_t *forbidden;
    int   dummy_eaten;
    int  *eaten;

    if (info) {
    go_tag_t* tag = (go_tag_t*) info->tag;
    forbidden = &tag->forbidden[color];
    eaten     = &tag->eaten[!color];
    } else {
    forbidden = &dummy_rc;
    eaten     = &dummy_eaten;
    }

    go_eval(board, lib, color);

    forbidden->r = -1;
    forbidden->c = -1;

    n = 0;
    for (i = 0; i < BRDSIZ; i++)
    for (j = 0; j < BRDSIZ; j++)
        if (board[i][j] == color && lib[i][j] == 0) {
        board[i][j] = BBLANK;
        forbidden->r = i;
        forbidden->c = j;
        ++*eaten;
        ++n;
        }

    if ( n != 1 ) {
    /* No or more than one chess were eaten,
     * no forbidden points, then. */
    forbidden->r = -1;
    forbidden->c = -1;
    }

    return (n > 0);
}

static int
go_clean(board_t board, int mark[][BRDSIZ], int x, int y, int color)
{
    static const int diff[][2] = {
    {1, 0}, {-1, 0}, {0, 1}, {0, -1}
    };
    int i;
    int total = 1;

    mark[x][y] = 0;
    board[x][y] = BBLANK;

    for (i = 0; i < 4; ++i) {
    int xx = x + diff[i][0];
    int yy = y + diff[i][1];

    if (xx >= 0 && xx < BRDSIZ && yy >= 0 && yy < BRDSIZ) {
        if ((board[xx][yy] == color) && mark[xx][yy])
        total += go_clean(board, mark, xx, yy, color);
    }
    }

    return total;
}

static int
go_cleandead(board_t board, int x, int y)
{
    int mark[BRDSIZ][BRDSIZ];
    int i, j;

    if (board[x][y] == BBLANK)
    return 0;

    for (i = 0; i < BRDSIZ; i++)
    for (j = 0; j < BRDSIZ; j++)
        mark[i][j] = 1;

    return go_clean(board, mark, x, y, board[x][y]);
}

static int
go_findcolor(board_p board, int x, int y)
{
    int k, result = 0, color[4];

    if (board[x][y] != BBLANK)
    return BBLANK;

    if (x > 0)
    {
    k = x;
    do --k;
    while ((board[k][y] == BBLANK) && (k > 0));
    color[0] = board[k][y];
    }
    else 
    color[0] = board[x][y];

    if (x < 18)
    {
    k = x;
    do ++k;
    while ((board[k][y] == BBLANK) && (k < 18));
    color[1] = board[k][y];
    }
    else
    color[1] = board[x][y];

    if (y > 0)
    {
    k = y;
    do --k;
    while ((board[x][k] == BBLANK) && (k > 0));
    color[2] = board[x][k];
    }
    else color[2] = board[x][y];

    if (y < 18)
    {
    k = y;
    do ++k;
    while ((board[x][k] == BBLANK) && (k < 18));
    color[3] = board[x][k];
    }
    else
    color[3] = board[x][y];

    for (k = 0; k < 4; k++)
    {
    if (color[k] == BBLANK)
        continue;
    else
    {
        result = color[k];
        break;
    }
    }
    if (k == 4)
    return BBLANK;

    for (k = 0; k < 4; k++)
    {
    if ((color[k] != BBLANK) && (color[k] != result))
        return BBLANK;
    }

    return result;
}

static int
go_result(ChessInfo* info)
{
    int       i, j;
    int       count[2];
    board_p   board = (board_p) info->board;
    go_tag_t *tag   = (go_tag_t*) info->tag;
    board_t   result_board;

    memcpy(result_board, board, sizeof(result_board));
    count[0] = count[1] = 0;

    for (i = 0; i < 19; i++)
    for (j = 0; j < 19; j++)
        if (board[i][j] == BBLANK)
        {
        int result = go_findcolor(board, i, j);
        if (result != BBLANK) {
            count[result]++;

            /* BWHITE => LWHITE, BBLACK => LBLACK */
            result_board[i][j] = result + 2;
        }
        }
        else
        count[(int) board[i][j]]++;

    memcpy(board, result_board, sizeof(result_board));

    /* 死子回填 */
    count[0] -= tag->eaten[1];
    count[1] -= tag->eaten[0];

    tag->eaten[0] = count[0];
    tag->eaten[1] = count[1];

    if (tag->feed_back < 0.01 && tag->eaten[0] == tag->eaten[1])
    return BBLANK; /* tie */
    else
    return tag->eaten[0] + tag->feed_back > tag->eaten[1] ?
        BWHITE : BBLACK;
}

static char*
go_getstep(const go_step_t* step, char buf[])
{
    static const char* const ColName = "ABCDEFGHJKLMNOPQRST";
    static const char* const RawName = "19181716151413121110987654321";
    static const int ansi_length     = sizeof(ANSI_COLOR(30;43)) - 1;

    strcpy(buf, turn_color[step->color]);
    buf[ansi_length    ] = ColName[step->loc.c * 2];
    buf[ansi_length + 1] = ColName[step->loc.c * 2 + 1];
    buf[ansi_length + 2] = RawName[step->loc.r * 2];
    buf[ansi_length + 3] = RawName[step->loc.r * 2 + 1];
    strcpy(buf + ansi_length + 4, ANSI_RESET "     ");

    return buf;
}

static void
go_init_tag(go_tag_t* tag)
{
    tag->game_end        = 0;
    tag->need_redraw     = 0;
    tag->feed_back       = 5.5;
    tag->eaten[0]        = 0;
    tag->eaten[1]        = 0;
    tag->forbidden[0].r  = -1;
    tag->forbidden[0].c  = -1;
    tag->forbidden[1].r  = -1;
    tag->forbidden[1].c  = -1;
}

static void
go_init_user(const userinfo_t* uinfo, ChessUser* user)
{
    strlcpy(user->userid, uinfo->userid, sizeof(user->userid));
    user->win  = uinfo->go_win;
    user->lose = uinfo->go_lose;
    user->tie  = uinfo->go_tie;
}

static void
go_init_user_userec(const userec_t* urec, ChessUser* user)
{
    strlcpy(user->userid, urec->userid, sizeof(user->userid));
    user->win  = urec->go_win;
    user->lose = urec->go_lose;
    user->tie  = urec->go_tie;
}

static void
go_init_board(board_t board)
{
    memset(board, BBLANK, sizeof(board_t));
}

static void
go_drawline(const ChessInfo* info, int line)
{
    static const char* const BoardPic[] = {
    "╔", "╤", "╤", "╗",
    "╟", "┼", "┼", "╢",
    "╟", "┼", "+", "╢",
    "╚", "╧", "╧", "╝",
    };
    static const int BoardPicIndex[] =
    { 0, 1, 1, 2, 1,
      1, 1, 1, 1, 2,
      1, 1, 1, 1, 1,
      2, 1, 1, 3 };

    board_p board = (board_p) info->board;
    go_tag_t* tag = (go_tag_t*) info->tag;

    if (line == 0) {
    prints(ANSI_COLOR(1;46) "   圍棋對戰   " ANSI_COLOR(45)
        "%30s VS %-20s%10s" ANSI_RESET,
           info->user1.userid, info->user2.userid,
           info->mode == CHESS_MODE_WATCH ? "[觀棋模式]" : "");
    } else if (line == 1) {
    outs("   A B C D E F G H J K L M N O P Q R S T");
    } else if (line >= 2 && line <= 20) {
    const int board_line = line - 2;
    const char* const* const pics =
        &BoardPic[BoardPicIndex[board_line] * 4];
    int i;

    prints("%2d" ANSI_COLOR(30;43), 21 - line);

    for (i = 0; i < BRDSIZ; ++i)
        if (board[board_line][i] == BBLANK)
        outs(pics[BoardPicIndex[i]]);
        else
        outs(bw_chess[(int) board[board_line][i]]);

    outs(ANSI_RESET);
    } else if (line >= 21 && line < b_lines)
    prints("%40s", "");
    else if (line == b_lines) {
    if (info->mode == CHESS_MODE_VERSUS ||
        info->mode == CHESS_MODE_PERSONAL) {
        if (tag->game_end)
        outs(ANSI_COLOR(31;47) "(w)" ANSI_COLOR(30) "計地" ANSI_RESET);
        else if (info->history.used == 0 && (info->myturn == BWHITE
            || info->mode == CHESS_MODE_PERSONAL))
        outs(ANSI_COLOR(31;47) "(x)" ANSI_COLOR(30) "授子" ANSI_RESET);
    }
    }

    if (line == 1 || line == 2) {
    int color = line - 1; /* BWHITE or BBLACK */

    if (tag->game_end && tag->clean_end == 3)
        prints("   " ANSI_COLOR(30;43) "%s" ANSI_RESET
            " 方子空:%3.1f", bw_chess[color],
            tag->eaten[color] +
            (color == BWHITE ? tag->feed_back : 0.0));
    else
        prints("   " ANSI_COLOR(30;43) "%s" ANSI_RESET
            " 方提子數:%3d", bw_chess[color], tag->eaten[color]);
    } else
    ChessDrawExtraInfo(info, line, 3);
}

static void
go_movecur(int r, int c)
{
    move(r + 2, c * 2 + 3);
}

static int
go_prepare_play(ChessInfo* info)
{
    if (((go_tag_t*) info->tag)->game_end) {
    strlcpy(info->warnmsg, "請清除死子,以便計算勝負",
        sizeof(info->warnmsg));
    if (info->last_movestr[0] != ' ')
        strcpy(info->last_movestr, "        ");
    }

    if (info->history.used == 1)
    ChessDrawLine(info, b_lines); /* clear the 'x' instruction */

    return 0;
}

static int
go_process_key(ChessInfo* info, int key, ChessGameResult* result)
{
    go_tag_t* tag = (go_tag_t*) info->tag;
    if (tag->game_end) {
    if (key == 'w') {
        if (!(tag->clean_end & 1)) {
        go_step_t step = { .type = CHESS_STEP_SPECIAL, .color = CLEANDONE };
        ChessStepSend(info, &step);
        tag->clean_end |= 1;
        }

        if (tag->clean_end & 2 || info->mode == CHESS_MODE_PERSONAL) {
        /* both sides agree */
        int winner = go_result(info);

        tag->clean_end = 3;

        if (winner == BBLANK)
            *result = CHESS_RESULT_TIE;
        else
            *result = (winner == info->myturn ?
                CHESS_RESULT_WIN : CHESS_RESULT_LOST);

        ChessRedraw(info);
        return 1;
        }
    } else if (key == 'u') {
        char buf[4];
        getdata(b_lines, 0, "是否真的要重新點死子? (y/N)",
            buf, sizeof(buf), DOECHO);
        ChessDrawLine(info, b_lines);

        if (buf[0] == 'y' || buf[0] == 'Y') {
        go_step_t step = { .type = CHESS_STEP_SPECIAL, .color = UNCLEAN };
        ChessStepSend(info, &step);

        memcpy(info->board, tag->backup_board, sizeof(tag->backup_board));
        tag->eaten[0] = tag->backup_eaten[0];
        tag->eaten[1] = tag->backup_eaten[1];
        }
    }
    } else if (key == 'x' && info->history.used == 0 &&
        ((info->mode == CHESS_MODE_VERSUS && info->myturn == BWHITE) ||
          info->mode == CHESS_MODE_PERSONAL)) {
    char buf[4];
    int  n;

    getdata(22, 43, "要授多少子呢(2 - 9)? ", buf, sizeof(buf), DOECHO);
    n = atoi(buf);

    if (n >= 2 && n <= 9) {
        go_step_t step = { CHESS_STEP_NORMAL, SETHAND, {n, 0} };
        
        ChessStepSend(info, &step);
        ChessHistoryAppend(info, &step);

        go_sethand(info->board, n);
        ((go_tag_t*)info->tag)->feed_back = 0.0;

        snprintf(info->last_movestr, sizeof(info->last_movestr),
            ANSI_COLOR(1) "授 %d 子" ANSI_RESET, n);
        ChessRedraw(info);
        return 1;
    } else
        ChessDrawLine(info, 22);
    }
    return 0;
}

static int
go_select(ChessInfo* info, rc_t location, ChessGameResult* result GCC_UNUSED)
{
    board_p   board = (board_p) info->board;

    if (GET_TAG(info)->game_end) {
    go_step_t step = { CHESS_STEP_SPECIAL, CLEAN, location };
    if (board[location.r][location.c] == BBLANK)
        return 0;

    GET_TAG(info)->eaten[!board[location.r][location.c]] +=
        go_cleandead(board, location.r, location.c);

    ChessStepSend(info, &step);
    ChessRedraw(info);
    return 0; /* don't have to return from ChessPlayFuncMy() */
    } else {
    go_step_t step = { CHESS_STEP_NORMAL, info->turn, location };

    if (board[location.r][location.c] != BBLANK)
        return 0;

    if (go_check(info, &step)) {
        board[location.r][location.c] = info->turn;
        ChessStepSend(info, &step);
        ChessHistoryAppend(info, &step);

        go_getstep(&step, info->last_movestr);
        if (go_examboard(board, !info->myturn, info))
        ChessRedraw(info);
        else
        ChessDrawLine(info, BOARD_LINE_ON_SCREEN(location.r));
        return 1;
    } else
        return 0;
    }
}

static void
go_prepare_step(ChessInfo* info, const go_step_t* step)
{
    go_tag_t* tag = GET_TAG(info);
    if (tag->game_end) {
    /* some actions need tag so are done here */
    if (step->color == CLEAN) {
        board_p board = (board_p) info->board;
        tag->eaten[!board[step->loc.r][step->loc.c]] +=
        go_cleandead(board, step->loc.r, step->loc.c);
    } else if (step->color == UNCLEAN) {
        memcpy(info->board, tag->backup_board, sizeof(tag->backup_board));
        tag->eaten[0] = tag->backup_eaten[0];
        tag->eaten[1] = tag->backup_eaten[1];
    } else if (step->color == CLEANDONE) {
        if (tag->clean_end & 1) {
        /* both sides agree */
        int winner = go_result(info);

        tag->clean_end = 3;

        if (winner == BBLANK)
            ((go_step_t*)step)->loc.r = (int) CHESS_RESULT_TIE;
        else
            ((go_step_t*)step)->loc.r = (int)
            (winner == info->myturn ?
             CHESS_RESULT_WIN : CHESS_RESULT_LOST);

        ChessRedraw(info);
        } else {
        ((go_step_t*)step)->color = BBLANK; /* tricks apply */
        tag->clean_end |= 2;
        }
    }
    } else if (step->type == CHESS_STEP_NORMAL) {
    if (step->color != SETHAND) {
        go_getstep(step, info->last_movestr);

        memcpy(tag->backup_board, info->board, sizeof(board_t));
        tag->backup_board[step->loc.r][step->loc.c] = step->color;

        /* if any chess was eaten, wholely redraw is needed */
        tag->need_redraw =
        go_examboard(tag->backup_board, !step->color, info);
    } else {
        snprintf(info->last_movestr, sizeof(info->last_movestr),
            ANSI_COLOR(1) "授 %d 子" ANSI_RESET, step->loc.r);
        tag->need_redraw = 1;
        ((go_tag_t*)info->tag)->feed_back = 0.0;
    }
    } else if (step->type == CHESS_STEP_PASS)
    strcpy(info->last_movestr, "虛手");
}

static ChessGameResult
go_apply_step(board_t board, const go_step_t* step)
{
    if (step->type != CHESS_STEP_NORMAL)
    return CHESS_RESULT_CONTINUE;

    switch (step->color) {
    case BWHITE:
    case BBLACK:
        board[step->loc.r][step->loc.c] = step->color;
        go_examboard(board, !step->color, NULL);
        break;

    case SETHAND:
        go_sethand(board, step->loc.r);
        break;

    case CLEAN:
        go_cleandead(board, step->loc.r, step->loc.c);
        break;

    case CLEANDONE:
        /* should be agreed by both sides, [see go_prepare_step()] */
        return (ChessGameResult) step->loc.r;
    }
    return CHESS_RESULT_CONTINUE;
}

static void
go_drawstep(ChessInfo* info, const go_step_t* step)
{
    go_tag_t* tag = GET_TAG(info);
    if (tag->game_end || tag->need_redraw)
    ChessRedraw(info);
    else
    ChessDrawLine(info, BOARD_LINE_ON_SCREEN(step->loc.r));
}

static ChessGameResult
go_post_game(ChessInfo* info)
{
    extern ChessGameResult ChessPlayFuncMy(ChessInfo* info);

    go_tag_t       *tag        = (go_tag_t*) info->tag;
    ChessTimeLimit *orig_limit = info->timelimit;
    ChessGameResult result;

    info->timelimit = NULL;
    info->turn      = info->myturn;
    strcpy(info->warnmsg, "請點除死子");
    ChessDrawLine(info, CHESS_DRAWING_WARN_ROW);

    memcpy(tag->backup_board, info->board, sizeof(tag->backup_board));
    tag->game_end  = 1;
    tag->clean_end = 0;
    tag->backup_eaten[0] = tag->eaten[0];
    tag->backup_eaten[1] = tag->eaten[1];

    ChessDrawLine(info, b_lines); /* 'w' instruction */

    while ((result = ChessPlayFuncMy(info)) == CHESS_RESULT_CONTINUE);

    ChessRedraw(info);

    info->timelimit = orig_limit;

    return result;
}

static void
go_gameend(ChessInfo* info, ChessGameResult result)
{
    if (info->mode == CHESS_MODE_VERSUS) {

    // lost was already initialized
    if (result != CHESS_RESULT_LOST)
        pwcuChessResult(SIG_GO, result);

    } else if (info->mode == CHESS_MODE_REPLAY) {
    free(info->board);
    free(info->tag);
    }
}

static void
go_genlog(ChessInfo* info, FILE* fp, ChessGameResult result GCC_UNUSED)
{
    static const char ColName[] = "ABCDEFGHJKLMNOPQRST";
    const int nStep = info->history.used;
    char buf[ANSILINELEN] = "";
    int   i, sethand = 0;
    VREFCUR cur;

    if (nStep > 0) {
    const go_step_t* const step =
        (const go_step_t*) ChessHistoryRetrieve(info, 0);
    if (step->color == SETHAND)
        sethand = step->loc.r;
    }

    cur = vcur_save();
    for (i = 1; i <= 22; i++)
    {
    move(i, 0);
    inansistr(buf, sizeof(buf)-1);
    fprintf(fp, "%s\n", buf);
    }
    vcur_restore(cur);

    fprintf(fp, "\n");
    fprintf(fp, "按 z 可進入打譜模式\n");
    fprintf(fp, "\n");

    if (sethand) {
    fprintf(fp, "[   1] 授 %d 子\n                ", sethand);
    i = 1;
    } else
    i = 0;

    for (; i < nStep; ++i) {
    const go_step_t* const step =
        (const go_step_t*) ChessHistoryRetrieve(info, i);
    if (step->type == CHESS_STEP_NORMAL)
        fprintf(fp, "[%3d]%s => %c%-4d", i + 1, bw_chess[step->color],
            ColName[step->loc.c], 19 - step->loc.r);
    else if (step->type == CHESS_STEP_PASS)
        fprintf(fp, "[%3d]%s => 虛手 ", i + 1, bw_chess[(i + 1) % 2]);
    else
        break;
    if (i % 5 == 4)
        fputc('\n', fp);
    }

    fprintf(fp,
        "\n\n《以下為 sgf 格式棋譜》\n<golog>\n(;GM[1]"
        "GN[%s-%s(W) Ptt]\n"
        "SZ[19]HA[%d]PB[%s]PW[%s]\n"
        "PC[FPG BBS/Ptt BBS: ptt.cc]\n",
        info->user1.userid, info->user2.userid,
        sethand,
        info->user1.userid, info->user2.userid);

    if (sethand) {
    const int lower = sethand * (sethand - 1) / 2;
    const int upper = lower + sethand;
    int j;
    fputs("AB", fp);
    for (j = lower; j < upper; ++j)
        fprintf(fp, "[%c%c]",
            SetHandPoints[j].c + 'a',
            SetHandPoints[j].r + 'a');
    fputc('\n', fp);
    }

    for (i = (sethand ? 1 : 0); i < nStep; ++i) {
    const go_step_t* const step =
        (const go_step_t*) ChessHistoryRetrieve(info, i);
    if (step->type == CHESS_STEP_NORMAL)
        fprintf(fp, ";%c[%c%c]",
            step->color == BWHITE ? 'W' : 'B',
            step->loc.c + 'a',
            step->loc.r + 'a');
    else if (step->type == CHESS_STEP_PASS)
        fprintf(fp, ";%c[]  ", i % 2 ? 'W' : 'B');
    else
        break;
    if (i % 10 == 9)
        fputc('\n', fp);
    }
    fprintf(fp, ";)\n<golog>\n\n");
}

void
gochess(int s, ChessGameMode mode)
{
    ChessInfo* info = NewChessInfo(&go_actions, &go_constants, s, mode);
    board_t    board;
    go_tag_t   tag;

    go_init_board(board);
    go_init_tag(&tag);

    info->board = board;
    info->tag   = &tag;

    info->cursor.r = 9;
    info->cursor.c = 9;

    // copied from gomo.c
    if (info->mode == CHESS_MODE_VERSUS) {
    /* Assume that info->user1 is me. */
    info->user1.lose++;
    pwcuChessResult(SIG_GO, CHESS_RESULT_LOST);
    }

    if (mode == CHESS_MODE_WATCH)
    setutmpmode(CHESSWATCHING);
    else
    setutmpmode(UMODE_GO);
    currutmp->sig = SIG_GO;

    ChessPlay(info);

    DeleteChessInfo(info);
}

int
gochess_main(void)
{
    return ChessStartGame('g', SIG_GO, "圍棋");
}

int
gochess_personal(void)
{
    gochess(0, CHESS_MODE_PERSONAL);
    return 0;
}

int
gochess_watch(void)
{
    return ChessWatchGame(&gochess, UMODE_GO, "圍棋");
}

static int
mygetc(FILE* fp, char* buf, int* idx, int len)
{
    for (;;) {
    while (buf[*idx] && isspace(buf[*idx])) ++*idx;

    if (buf[*idx]) {
        ++*idx;
        return buf[*idx - 1];
    }

    if (fgets(buf, len, fp) == NULL)
        return EOF;

    if (strcmp(buf, "<golog>\n") == 0)
        return EOF;

    *idx = 0;
    }
}

ChessInfo*
gochess_replay(FILE* fp)
{
    ChessInfo *info;
    int        ch;
    char       userid[2][IDLEN + 1] = { "", "" };
    char       sethand_str[4] = "";
    char      *recording = NULL;
    char      *record_end = NULL;
    go_step_t  step;

    /* for mygetc */
    char buf[512] = "";
    int  idx = 0;

#define GETC() mygetc(fp, buf, &idx, sizeof(buf))

    /* sgf file started with "(;" */
    if (GETC() != '(' || GETC() != ';')
    return NULL;

    /* header info */
    while ((ch = GETC()) != EOF && ch != ';') {
    if (ch == '[') {
        if (recording) {
        while ((ch = GETC()) != EOF && ch != ']')
            if (recording < record_end)
            *recording++ = ch;
        *recording = 0;
        recording = NULL;
        } else
        while ((ch = GETC()) != EOF && ch != ']')
            continue;

        if (ch == EOF)
        break;
    } else if (ch == ';') /* next stage */
        break;
    else {
        int ch2 = GETC();

        if (ch2 == EOF) {
        ch = EOF;
        break;
        }

        if (ch == 'P') {
        if (ch2 == 'B') {
            recording  = userid[BBLACK];
            record_end = userid[BBLACK] + IDLEN;
        } else if (ch2 == 'W') {
            recording  = userid[BWHITE];
            record_end = userid[BWHITE] + IDLEN;
        }
        } else if (ch == 'H') {
        if (ch2 == 'A') {
            recording  = sethand_str;
            record_end = sethand_str + sizeof(sethand_str) - 1;
        }
        }
    }
    }

    if (ch == EOF)
    return NULL;

    info = NewChessInfo(&go_actions, &go_constants,
        0, CHESS_MODE_REPLAY);

    /* filling header information to info */
    if (userid[BBLANK][0]) {
    userec_t rec;
    if (getuser(userid[BBLANK], &rec))
        go_init_user_userec(&rec, &info->user1);
    }

    if (userid[BWHITE][0]) {
    userec_t rec;
    if (getuser(userid[BWHITE], &rec))
        go_init_user_userec(&rec, &info->user2);
    }

    if (sethand_str[0]) {
    int sethand = atoi(sethand_str);
    if (sethand >= 2 && sethand <= 9) {
        step.type  = CHESS_STEP_NORMAL;
        step.color = SETHAND;
        step.loc.r = sethand;
        ChessHistoryAppend(info, &step);
    }
    }

    /* steps, ends with ")" */
    while ((ch = GETC()) != EOF && ch != ')') {
    if (ch == ';')
        ChessHistoryAppend(info, &step);
    else if (ch == 'B')
        step.color = BBLACK;
    else if (ch == 'W')
        step.color = BWHITE;
    else if (ch == '[') {
        ch = GETC();
        if (ch == EOF)
        break;
        else if (ch == ']') {
        step.type = CHESS_STEP_PASS;
        continue;
        } else
        step.loc.c = ch - 'a';

        ch = GETC();
        if (ch == EOF)
        break;
        else if (ch == ']') {
        step.type = CHESS_STEP_PASS;
        continue;
        } else
        step.loc.r = ch - 'a';

        while ((ch = GETC()) != EOF && ch != ']');

        if (step.loc.r < 0 || step.loc.r >= BRDSIZ ||
            step.loc.c < 0 || step.loc.c >= BRDSIZ)
        step.type = CHESS_STEP_PASS;
        else
        step.type = CHESS_STEP_NORMAL;
    }
    }

    info->board = malloc(sizeof(board_t));
    info->tag   = malloc(sizeof(go_tag_t));

    go_init_board(info->board);
    go_init_tag(info->tag);

    return info;

#undef GETC
}