terminal-chess: src/game.c@08d7a6e3ec31

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2014 Mike Becker. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    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  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  *

    28  */

    30 #include "game.h"

    31 #include "input.h"

    32 #include "rules/rules.h"

    33 #include <ncurses.h>

    34 #include <string.h>

    36 static const uint8_t boardx = 10, boardy = 10;

    38 static void draw_board(Board board, uint8_t mycolor) {

    40     for (uint8_t y = 0 ; y < 8 ; y++) {

    41         for (uint8_t x = 0 ; x < 8 ; x++) {

    42             uint8_t col = board[y][x] & COLOR_MASK;

    43             uint8_t piece = board[y][x] & PIECE_MASK;

    44             char piecec = ' ';

    45             switch (piece) {

    46                 case PAWN: piecec = 'P'; break;

    47                 case ROOK: piecec = 'R'; break;

    48                 case KNIGHT: piecec = 'N'; break;

    49                 case BISHOP: piecec = 'B'; break;

    50                 case QUEEN: piecec = 'Q'; break;

    51                 case KING: piecec = 'K'; break;

    52             }

    54             attrset((col == WHITE ? A_BOLD : A_DIM) |

    55                 COLOR_PAIR((y&1)==(x&1) ? COL_WB : COL_BW));

    57             int cy = mycolor == WHITE ? boardy-y : boardy-7+y;

    58             int cx = mycolor == WHITE ? boardx+x*3 : boardx+21-x*3;

    59             mvaddch(cy, cx, ' ');

    60             mvaddch(cy, cx+1, piecec);

    61             mvaddch(cy, cx+2, ' ');

    62         }

    63     }

    65     attrset(A_NORMAL);

    66     for (uint8_t i = 0 ; i < 8 ; i++) {

    67         int x = mycolor == WHITE ? boardx+i*3+1 : boardx+22-i*3;

    68         int y = mycolor == WHITE ? boardy-i : boardy-7+i;

    69         mvaddch(boardy+1, x, 'a'+i);

    70         mvaddch(y, boardx-2, '1'+i);

    71     }

    72 }

    74 static void apply_move(Board board, Move *move) {

    75     board[move->fromrow][move->fromfile] = 0;

    76     // TODO: care for en passant capture

    77     board[move->torow][move->tofile] = move->piece;

    79     /* castling */

    80     if ((move->piece & PIECE_MASK) == KING &&

    81         move->fromfile == fileidx('e')) {

    82         uint8_t color = move->piece & COLOR_MASK;

    84         if (move->tofile == fileidx('g')) {

    85             board[move->torow][fileidx('h')] = 0;

    86             board[move->torow][fileidx('f')] = color|ROOK;

    87         } else if (move->tofile == fileidx('c')) {

    88             board[move->torow][fileidx('a')] = 0;

    89             board[move->torow][fileidx('d')] = color|ROOK;

    90         }

    91     }

    92 }

    94 static _Bool validate_move(Board board, Move *move) {

    95     _Bool result;

    97     /* does piece exist */

    98     result = board[move->fromrow][move->fromfile] == move->piece;

   100     switch (move->piece & PIECE_MASK) {

   101     case PAWN:

   102         result = result && pawn_chkrules(board, move);

   103         result = result && !pawn_isblocked(board, move);

   104         break;

   105     case ROOK:

   106         result = result && rook_chkrules(board, move);

   107         result = result && !rook_isblocked(board, move);

   108         break;

   109     case KNIGHT:

   110         result = result && knight_chkrules(board, move);

   111         result = result && !knight_isblocked(board, move);

   112         break;

   113     case BISHOP:

   114         result = result && bishop_chkrules(board, move);

   115         result = result && !bishop_isblocked(board, move);

   116         break;

   117     case QUEEN:

   118         result = result && queen_chkrules(board, move);

   119         result = result && !queen_isblocked(board, move);

   120         break;

   121     case KING:

   122         result = result && king_chkrules(board, move);

   123         result = result && !king_isblocked(board, move);

   124         break;

   125     default:

   126         result = FALSE;

   127     }

   129     /* is piece pinned */

   130     // TODO: make it so

   132     /* correct check and checkmate flags */

   133     // TODO: make it so

   135     return result;

   136 }

   138 static _Bool eval_move(Board board, uint8_t mycolor, char *mstr, Move *move) {

   139     memset(move, 0, sizeof(Move));

   141     size_t len = strlen(mstr);

   143     /* evaluate check/checkmate flags */

   144     if (mstr[len-1] == '+') {

   145         len--; mstr[len] = '\0';

   146         move->check = TRUE;

   147     } else if (mstr[len-1] == '#') {

   148         len--; mstr[len] = '\0';

   149         move->checkmate = TRUE;

   150     }

   152     if (len == 2) {

   153         /* pawn move (e.g. "e4") */

   154         if (isfile(mstr[0]) && isrow(mstr[1])) {

   155             move->piece = PAWN|mycolor;

   156             move->tofile = fileidx(mstr[0]);

   157             move->torow = rowidx(mstr[1]);

   158             if (!pawn_getlocation(board, move)) {

   159                 move->piece = 0;

   160             }

   161         }

   162     } else if (len == 3) {

   163         if (strcmp(mstr, "O-O") == 0) {

   164             /* king side castling */

   165             move->piece = KING|mycolor;

   166             move->fromfile = fileidx('e');

   167             move->tofile = fileidx('g');

   168             move->fromrow = move->torow = mycolor == WHITE ? 0 : 7;

   169         } else {

   170             /* unambiguous move (e.g. "Nf3") */

   171         }

   173     } else if (len == 4) {

   174         /* ambiguous move (e.g. "Ndf3") */

   176         /* unambiguous capture (e.g. "Nxf3", "dxe5") */

   178     } else if (len == 5) {

   179         if (strcmp(mstr, "O-O-O") == 0) {

   180             /* queen side castling "O-O-O" */

   181             move->piece = KING|mycolor;

   182             move->fromfile = fileidx('e');

   183             move->tofile = fileidx('c');

   184             move->fromrow = move->torow = mycolor == WHITE ? 0 : 7;

   185         } else {

   186             /* ambiguous capture (e.g. "Ndxf3") */

   188             /* long notation move (e.g. "Nc5a4") */

   190             /* long notation capture (e.g. "e5xf6") */

   191         }

   192     } else if (len == 6) {

   193         /* long notation capture (e.g. "Nc5xf3") */

   194     }

   196     return move->piece != 0;

   197 }

   199 static int sendmove(Board board, uint8_t mycolor, int opponent) {

   200     const size_t buflen = 8;

   201     char movestr[buflen];

   202     _Bool remisrejected = FALSE;

   203     uint8_t code;

   205     while (1) {

   206         move(boardy+3, 0);

   207         if (remisrejected) {

   208             printw(

   209                 "Use chess notation to enter your move.\n"

   210                 "Remis offer rejected - type 'surr' to surrender.      \n\n"

   211                 "Type your move: ");

   212         } else {

   213             printw(

   214                 "Use chess notation to enter your move.\n"

   215                 "Or type 'surr' to surrender or 'remis' to offer remis.\n\n"

   216                 "Type your move: ");

   217         }

   218         clrtoeol();

   219         refresh();

   220         getnstr(movestr, buflen);

   222         if (strncmp(movestr, "surr", buflen) == 0) {

   223             printw("You surrendered!");

   224             refresh();

   225             net_send_code(opponent, NETCODE_SURRENDER);

   226             return 1;

   227         } else if (strncmp(movestr, "remis", buflen) == 0) {

   228             if (!remisrejected) {

   229                 net_send_code(opponent, NETCODE_REMIS);

   230                 printw("Remis offer sent - waiting for acceptance...");

   231                 refresh();

   232                 if (net_recieve_code(opponent) == NETCODE_ACCEPT) {

   233                     printw("\rRemis accepted!");

   234                     clrtoeol();

   235                     refresh();

   236                     return 1;

   237                 } else {

   238                     remisrejected = TRUE;

   239                 }

   240             }

   241         } else {

   242             Move move;

   243             if (eval_move(board, mycolor, movestr, &move)) {

   244                 net_send_code(opponent, NETCODE_MOVE);

   245                 net_send_data(opponent, &move, sizeof(Move));

   246                 code = net_recieve_code(opponent);

   247                 move.check = code == NETCODE_CHECK;

   248                 move.checkmate = code == NETCODE_CHECKMATE;

   249                 // TODO: record move

   250                 if (code == NETCODE_DECLINE) {

   251                     printw("Invalid move.");

   252                     clrtoeol();

   253                 } else {

   254                     apply_move(board, &move);

   255                     if (move.checkmate) {

   256                         printw("Checkmate!");

   257                         return 1;

   258                     }

   259                 }

   260             } else {

   261                 printw("Can't interpret move - please use algebraic notation.");

   262             }

   263         }

   264     }

   265 }

   267 static int recvmove(Board board, int opponent) {

   269     while (1) {

   270         move(boardy+3, 0);

   271         printw("Awaiting opponent move...");

   272         clrtoeol();

   273         refresh();

   275         // TODO: nonblocking

   276         uint32_t code = net_recieve_code(opponent);

   278         Move move;

   279         switch (code) {

   280             case NETCODE_SURRENDER:

   281                 printw("\rYour opponent surrendered!");

   282                 clrtoeol();

   283                 return 1;

   284             case NETCODE_REMIS:

   285                 if (prompt_yesno(

   286                     "\rYour opponent offers remis - do you accept")) {

   287                     printw("\rRemis accepted!");

   288                     clrtoeol();

   289                     net_send_code(opponent, NETCODE_ACCEPT);

   290                     return 1;

   291                 } else {

   292                     net_send_code(opponent, NETCODE_DECLINE);

   293                 }

   294                 break;

   295             case NETCODE_MOVE:

   296                 net_recieve_data(opponent, &move, sizeof(Move));

   297                 if (validate_move(board, &move)) {

   298                     apply_move(board, &move);

   299                     // TODO: record move

   300                     if (move.check) {

   301                         net_send_code(opponent, NETCODE_CHECK);

   302                     } else if (move.checkmate) {

   303                         net_send_code(opponent, NETCODE_CHECKMATE);

   304                     } else {

   305                         net_send_code(opponent, NETCODE_ACCEPT);

   306                     }

   307                     return 0;

   308                 } else {

   309                     net_send_code(opponent, NETCODE_DECLINE);

   310                 }

   311         }

   312     }

   313 }

   315 void game_start(Settings *settings, int opponent) {

   316     _Bool myturn = is_server(settings) ==

   317         (settings->gameinfo.servercolor == WHITE);

   318     uint8_t mycolor = myturn ? WHITE:BLACK;

   320     _Bool running;

   322     Board board = {

   323         {WROOK, WKNIGHT, WBISHOP, WQUEEN, WKING, WBISHOP, WKNIGHT, WROOK},

   324         {WPAWN, WPAWN,   WPAWN,   WPAWN,  WPAWN, WPAWN,   WPAWN,   WPAWN},

   325         {0,     0,       0,       0,      0,     0,       0,       0},

   326         {0,     0,       0,       0,      0,     0,       0,       0},

   327         {0,     0,       0,       0,      0,     0,       0,       0},

   328         {0,     0,       0,       0,      0,     0,       0,       0},

   329         {BPAWN, BPAWN,   BPAWN,   BPAWN,  BPAWN, BPAWN,   BPAWN,   BPAWN},

   330         {BROOK, BKNIGHT, BBISHOP, BQUEEN, BKING, BBISHOP, BKNIGHT, BROOK}

   331     };

   333     do {

   334         clear();

   335         draw_board(board, mycolor);

   336         if (myturn) {

   337             running = !sendmove(board, mycolor, opponent);

   338         } else {

   339             running = !recvmove(board, opponent);

   340             flushinp(); // flush any input the user hacked in while waiting

   341         }

   342         myturn ^= TRUE;

   343     }  while (running);

   345     mvaddstr(getmaxy(tchess_window)-1, 0,

   346         "Game has ended. Press any key to leave...");

   347     getch();

   348 }

Mercurial > hg > terminal-chess / file revision

src/game.c@08d7a6e3ec31

src/game.c