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comparison: src/chess/rook.c

src/chess/rook.c

changeset 23
824c9522ce66
parent 21
2e5846019b4f
child 47
d726e4b46c33
equal deleted inserted replaced
22:41bbfd4d17a3 23:824c9522ce66
32 32
33 _Bool rook_chkrules(Move *move) { 33 _Bool rook_chkrules(Move *move) {
34 return move->torow == move->fromrow || move->tofile == move->fromfile; 34 return move->torow == move->fromrow || move->tofile == move->fromfile;
35 } 35 }
36 36
37 _Bool rook_isblocked(Board board, Move *move) { 37 _Bool rook_isblocked(GameState *gamestate, Move *move) {
38 38
39 if (move->torow == move->fromrow) { 39 if (move->torow == move->fromrow) {
40 int d = move->tofile > move->fromfile ? 1 : -1; 40 int d = move->tofile > move->fromfile ? 1 : -1;
41 uint8_t f = move->fromfile; 41 uint8_t f = move->fromfile;
42 while (f != move->tofile-d) { 42 while (f != move->tofile-d) {
43 f += d; 43 f += d;
44 if (board[move->fromrow][f]) { 44 if (gamestate->board[move->fromrow][f]) {
45 return 1; 45 return 1;
46 } 46 }
47 } 47 }
48 } else { 48 } else {
49 int d = move->torow > move->fromrow ? 1 : -1; 49 int d = move->torow > move->fromrow ? 1 : -1;
50 uint8_t r = move->fromrow; 50 uint8_t r = move->fromrow;
51 while (r != move->torow - d) { 51 while (r != move->torow - d) {
52 r += d; 52 r += d;
53 if (board[r][move->fromfile]) { 53 if (gamestate->board[r][move->fromfile]) {
54 return 1; 54 return 1;
55 } 55 }
56 } 56 }
57 } 57 }
58 58
59 return 0; 59 return 0;
60 } 60 }
61 61
62 static int rook_getloc_fixedrow(Board board, Move *move) { 62 static int rook_getloc_fixedrow(GameState *gamestate, Move *move) {
63 uint8_t file = POS_UNSPECIFIED; 63 uint8_t file = POS_UNSPECIFIED;
64 for (uint8_t f = 0 ; f < 8 ; f++) { 64 for (uint8_t f = 0 ; f < 8 ; f++) {
65 if (board[move->fromrow][f] == move->piece) { 65 if (gamestate->board[move->fromrow][f] == move->piece) {
66 if (file == POS_UNSPECIFIED) { 66 if (file == POS_UNSPECIFIED) {
67 file = f; 67 file = f;
68 } else { 68 } else {
69 return AMBIGUOUS_MOVE; 69 return AMBIGUOUS_MOVE;
70 } 70 }
76 move->fromfile = file; 76 move->fromfile = file;
77 return VALID_MOVE_SYNTAX; 77 return VALID_MOVE_SYNTAX;
78 } 78 }
79 } 79 }
80 80
81 static int rook_getloc_fixedfile(Board board, Move *move) { 81 static int rook_getloc_fixedfile(GameState *gamestate, Move *move) {
82 uint8_t row = POS_UNSPECIFIED; 82 uint8_t row = POS_UNSPECIFIED;
83 for (uint8_t r = 0 ; r < 8 ; r++) { 83 for (uint8_t r = 0 ; r < 8 ; r++) {
84 if (board[r][move->fromfile] == move->piece) { 84 if (gamestate->board[r][move->fromfile] == move->piece) {
85 if (row == POS_UNSPECIFIED) { 85 if (row == POS_UNSPECIFIED) {
86 row = r; 86 row = r;
87 } else { 87 } else {
88 return AMBIGUOUS_MOVE; 88 return AMBIGUOUS_MOVE;
89 } 89 }
95 move->fromrow = row; 95 move->fromrow = row;
96 return VALID_MOVE_SYNTAX; 96 return VALID_MOVE_SYNTAX;
97 } 97 }
98 } 98 }
99 99
100 int rook_getlocation(Board board, Move *move) { 100 int rook_getlocation(GameState *gamestate, Move *move) {
101 101
102 if (move->fromfile != POS_UNSPECIFIED) { 102 if (move->fromfile != POS_UNSPECIFIED) {
103 if (move->fromfile == move->tofile) { 103 if (move->fromfile == move->tofile) {
104 return rook_getloc_fixedfile(board, move); 104 return rook_getloc_fixedfile(gamestate, move);
105 } else { 105 } else {
106 if (board[move->torow][move->fromfile] == move->piece) { 106 if (gamestate->board[move->torow][move->fromfile] == move->piece) {
107 move->fromrow = move->torow; 107 move->fromrow = move->torow;
108 return VALID_MOVE_SYNTAX; 108 return VALID_MOVE_SYNTAX;
109 } else { 109 } else {
110 return INVALID_POSITION; 110 return INVALID_POSITION;
111 } 111 }
112 } 112 }
113 } 113 }
114 114
115 if (move->fromrow != POS_UNSPECIFIED) { 115 if (move->fromrow != POS_UNSPECIFIED) {
116 if (move->fromrow == move->torow) { 116 if (move->fromrow == move->torow) {
117 return rook_getloc_fixedrow(board, move); 117 return rook_getloc_fixedrow(gamestate, move);
118 } else { 118 } else {
119 if (board[move->fromrow][move->tofile] == move->piece) { 119 if (gamestate->board[move->fromrow][move->tofile] == move->piece) {
120 move->fromfile = move->tofile; 120 move->fromfile = move->tofile;
121 return VALID_MOVE_SYNTAX; 121 return VALID_MOVE_SYNTAX;
122 } else { 122 } else {
123 return INVALID_POSITION; 123 return INVALID_POSITION;
124 } 124 }
126 } 126 }
127 127
128 Move chkrowmove = *move, chkfilemove = *move; 128 Move chkrowmove = *move, chkfilemove = *move;
129 129
130 chkrowmove.fromrow = move->torow; 130 chkrowmove.fromrow = move->torow;
131 int chkrow = rook_getloc_fixedrow(board, &chkrowmove); 131 int chkrow = rook_getloc_fixedrow(gamestate, &chkrowmove);
132 132
133 chkfilemove.fromfile = move->tofile; 133 chkfilemove.fromfile = move->tofile;
134 int chkfile = rook_getloc_fixedfile(board, &chkfilemove); 134 int chkfile = rook_getloc_fixedfile(gamestate, &chkfilemove);
135 135
136 if ((chkrow == VALID_MOVE_SYNTAX && chkfile == VALID_MOVE_SYNTAX) || 136 if ((chkrow == VALID_MOVE_SYNTAX && chkfile == VALID_MOVE_SYNTAX) ||
137 chkrow == AMBIGUOUS_MOVE || chkfile == AMBIGUOUS_MOVE) { 137 chkrow == AMBIGUOUS_MOVE || chkfile == AMBIGUOUS_MOVE) {
138 return AMBIGUOUS_MOVE; 138 return AMBIGUOUS_MOVE;
139 } 139 }

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