terminal-chess: src/game.c@52d742aee695

     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 <ncurses.h>

    33 #include <string.h>

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

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

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

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

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

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

    43             char piecec = ' ';

    44             switch (piece) {

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

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

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

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

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

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

    51             }

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

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

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

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

    58             mvaddch(cy, cx, ' ');

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

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

    61         }

    62     }

    64     attrset(A_NORMAL);

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

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

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

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

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

    70     }

    71 }

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

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

    75     // TODO: care for en passant capture

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

    77 }

    79 static _Bool validate_move(Board board, uint8_t mycolor, Move *move) {

    80     _Bool result = TRUE;

    82     /* does piece exist */

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

    85     /* is move rule conform */

    86     // TODO: make it so

    88     /* is piece blocked */

    89     // TODO: make it so

    91     /* is piece pinned */

    92     // TODO: make it so

    94     return result;

    95 }

    97 static _Bool eval_move(Board board, uint8_t mycolor, char *movestr, Move *move) {

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

   100     size_t len = strlen(movestr);

   102     /* remove check */

   103     if (movestr[len-1] == '+') {

   104         len--; movestr[len] = '\0';

   105         move->check = TRUE;

   106     }

   108     if (len == 2) {

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

   110         if (isfile(movestr[0]) && isrow(movestr[1])) {

   111             move->piece = PAWN;

   112             move->fromfile = move->tofile = fileidx(movestr[0]);

   113             move->torow = rowidx(movestr[1]);

   114             move->fromrow = rowidx(movestr[1]) + (mycolor == WHITE ? -1 : 1);

   115             if (move->fromrow > 6) {

   116                 move->piece = 0;

   117             } else {

   118                 /* advanced first move */

   119                 if (move->fromrow == (mycolor == WHITE ? 2 : 5) &&

   120                     board[move->fromrow][move->fromfile] != (mycolor|PAWN)) {

   122                     move->fromrow += (mycolor == WHITE ? -1 : 1);

   123                     if (move->fromrow > 6) {

   124                         move->piece = 0;

   125                     }

   126                 }

   127             }

   128         }

   129     } else if (len == 3) {

   130         if (strcmp(movestr, "0-0") == 0) {

   131             /* king side castling */

   132             move->piece = KING;

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

   134             move->fromfile = fileidx('g');

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

   136         } else {

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

   138         }

   140     } else if (len == 4) {

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

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

   145     } else if (len == 5) {

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

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

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

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

   153     } else if (len == 6) {

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

   155     }

   157     if (move->piece) {

   158         move->piece |= mycolor;

   159         return TRUE;

   160     } else {

   161         return FALSE;

   162     }

   163 }

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

   166     const size_t buflen = 8;

   167     char movestr[buflen];

   168     _Bool remisrejected = FALSE;

   170     while (1) {

   171         move(boardy+3, 0);

   172         if (remisrejected) {

   173             printw(

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

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

   176                 "Type your move: ");

   177         } else {

   178             printw(

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

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

   181                 "Type your move: ");

   182         }

   183         clrtoeol();

   184         refresh();

   185         getnstr(movestr, buflen);

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

   188             printw("You surrendered!");

   189             refresh();

   190             net_send_code(opponent, NETCODE_SURRENDER);

   191             return 1;

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

   193             if (!remisrejected) {

   194                 net_send_code(opponent, NETCODE_REMIS);

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

   196                 refresh();

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

   198                     printw("\rRemis accepted!");

   199                     clrtoeol();

   200                     refresh();

   201                     return 1;

   202                 } else {

   203                     remisrejected = TRUE;

   204                 }

   205             }

   206         } else {

   207             Move move;

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

   209                 net_send_code(opponent, NETCODE_MOVE);

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

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

   212                     apply_move(board, &move);

   213                     return 0;

   214                 } else {

   215                     printw("Invalid move.");

   216                     clrtoeol();

   217                 }

   218             } else {

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

   220             }

   221         }

   222     }

   223 }

   225 static int recvmove(Board board, uint8_t mycolor, int opponent) {

   227     while (1) {

   228         move(boardy+3, 0);

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

   230         clrtoeol();

   231         refresh();

   233         // TODO: nonblocking

   234         uint32_t code = net_recieve_code(opponent);

   236         Move move;

   237         switch (code) {

   238             case NETCODE_SURRENDER:

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

   240                 clrtoeol();

   241                 return 1;

   242             case NETCODE_REMIS:

   243                 if (prompt_yesno(

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

   245                     printw("\rRemis accepted!");

   246                     clrtoeol();

   247                     net_send_code(opponent, NETCODE_ACCEPT);

   248                     return 1;

   249                 } else {

   250                     net_send_code(opponent, NETCODE_DECLINE);

   251                 }

   252                 break;

   253             case NETCODE_MOVE:

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

   255                 if (validate_move(board, mycolor, &move)) {

   256                     apply_move(board, &move);

   257                     net_send_code(opponent, NETCODE_ACCEPT);

   258                     return 0;

   259                 } else {

   260                     net_send_code(opponent, NETCODE_DECLINE);

   261                 }

   262         }

   263     }

   264 }

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

   267     _Bool myturn = is_server(settings) ==

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

   269     uint8_t mycolor = myturn ? WHITE:BLACK;

   271     _Bool running;

   273     Board board = {

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

   275         {WPAWN, WPAWN,   WPAWN,   WPAWN,  WPAWN, WPAWN,   WPAWN,   WPAWN},

   276         {0,     0,       0,       0,      0,     0,       0,       0},

   277         {0,     0,       0,       0,      0,     0,       0,       0},

   278         {0,     0,       0,       0,      0,     0,       0,       0},

   279         {0,     0,       0,       0,      0,     0,       0,       0},

   280         {BPAWN, BPAWN,   BPAWN,   BPAWN,  BPAWN, BPAWN,   BPAWN,   BPAWN},

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

   282     };

   284     do {

   285         clear();

   286         draw_board(board, mycolor);

   287         if (myturn) {

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

   289         } else {

   290             running = !recvmove(board, mycolor, opponent);

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

   292         }

   293         myturn ^= 1;

   294     }  while (running);

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

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

   298     getch();

   299 }

Mercurial > hg > terminal-chess / file revision

src/game.c@52d742aee695

src/game.c