terminal-chess: src/game.c@4e4f156bba58 (annotated)

src/game.c@4e4f156bba58 (annotated)

src/game.c

Sat, 22 Mar 2014 16:25:49 +0100

author: Mike Becker <universe@uap-core.de>
date: Sat, 22 Mar 2014 16:25:49 +0100
changeset 9: 4e4f156bba58
parent 8: 52d742aee695
child 10: 1347e4dabac0
permissions: -rw-r--r--

implemented castling (without validation)

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2014 Mike Becker. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
  */
 #include "game.h"
 #include "input.h"
 #include <ncurses.h>
 #include <string.h>
 static const uint8_t boardx = 10, boardy = 10;
 static void draw_board(Board board, uint8_t mycolor) {
     for (uint8_t y = 0 ; y < 8 ; y++) {
         for (uint8_t x = 0 ; x < 8 ; x++) {
             uint8_t col = board[y][x] & COLOR_MASK;
             uint8_t piece = board[y][x] & PIECE_MASK;
             char piecec = ' ';
             switch (piece) {
                 case PAWN: piecec = 'P'; break;
                 case ROOK: piecec = 'R'; break;
                 case KNIGHT: piecec = 'N'; break;
                 case BISHOP: piecec = 'B'; break;
                 case QUEEN: piecec = 'Q'; break;
                 case KING: piecec = 'K'; break;
             }
             attrset((col == WHITE ? A_BOLD : A_DIM) |
                 COLOR_PAIR((y&1)==(x&1) ? COL_WB : COL_BW));
             int cy = mycolor == WHITE ? boardy-y : boardy-7+y;
             int cx = mycolor == WHITE ? boardx+x*3 : boardx+21-x*3;
             mvaddch(cy, cx, ' ');
             mvaddch(cy, cx+1, piecec);
             mvaddch(cy, cx+2, ' ');
         }
     }
     attrset(A_NORMAL);
     for (uint8_t i = 0 ; i < 8 ; i++) {
         int x = mycolor == WHITE ? boardx+i*3+1 : boardx+22-i*3;
         int y = mycolor == WHITE ? boardy-i : boardy-7+i;
         mvaddch(boardy+1, x, 'a'+i);
         mvaddch(y, boardx-2, '1'+i);
     }
 }
 static void apply_move(Board board, Move *move) {
     board[move->fromrow][move->fromfile] = 0;
     // TODO: care for en passant capture
     board[move->torow][move->tofile] = move->piece;
     /* castling */
     if ((move->piece & PIECE_MASK) == KING &&
         move->fromfile == fileidx('e')) {
         uint8_t color = move->piece & COLOR_MASK;
         if (move->tofile == fileidx('g')) {
             board[move->torow][fileidx('h')] = 0;
             board[move->torow][fileidx('f')] = color|ROOK;
         } else if (move->tofile == fileidx('c')) {
             board[move->torow][fileidx('a')] = 0;
             board[move->torow][fileidx('d')] = color|ROOK;
         }
     }
 }
 static _Bool validate_move(Board board, uint8_t mycolor, Move *move) {
     _Bool result = TRUE;
     /* does piece exist */
     result &= board[move->fromrow][move->fromfile] == move->piece;
     /* does move comply to rules */
     // TODO: make it so
     /* is piece blocked */
     // TODO: make it so
     /* is piece pinned */
     // TODO: make it so
     return result;
 }
 static _Bool eval_move(Board board, uint8_t mycolor, char *mstr, Move *move) {
     memset(move, 0, sizeof(Move));
     size_t len = strlen(mstr);
     /* remove check */
     if (mstr[len-1] == '+') {
         len--; mstr[len] = '\0';
         move->check = TRUE;
     }
     if (len == 2) {
         /* pawn move (e.g. "e4") */
         if (isfile(mstr[0]) && isrow(mstr[1])) {
             move->piece = PAWN;
             move->fromfile = move->tofile = fileidx(mstr[0]);
             move->torow = rowidx(mstr[1]);
             move->fromrow = rowidx(mstr[1]) + (mycolor == WHITE ? -1 : 1);
             if (move->fromrow > 6) {
                 move->piece = 0;
             } else {
                 /* advanced first move */
                 if (move->fromrow == (mycolor == WHITE ? 2 : 5) &&
                     board[move->fromrow][move->fromfile] != (mycolor|PAWN)) {
                     move->fromrow += (mycolor == WHITE ? -1 : 1);
                     if (move->fromrow > 6) {
                         move->piece = 0;
                     }
                 }
             }
         }
     } else if (len == 3) {
         if (strcmp(mstr, "O-O") == 0) {
             /* king side castling */
             move->piece = KING;
             move->fromfile = fileidx('e');
             move->tofile = fileidx('g');
             move->fromrow = move->torow = mycolor == WHITE ? 0 : 7;
         } else {
             /* unambiguous move (e.g. "Nf3") */
         }
     } else if (len == 4) {
         /* ambiguous move (e.g. "Ndf3") */
         /* unambiguous capture (e.g. "Nxf3", "dxe5") */
     } else if (len == 5) {
         if (strcmp(mstr, "O-O-O") == 0) {
             /* queen side castling "O-O-O" */
             move->piece = KING;
             move->fromfile = fileidx('e');
             move->tofile = fileidx('c');
             move->fromrow = move->torow = mycolor == WHITE ? 0 : 7;
         } else {
             /* ambiguous capture (e.g. "Ndxf3") */
             /* long notation move (e.g. "Nc5a4") */
             /* long notation capture (e.g. "e5xf6") */
         }
     } else if (len == 6) {
         /* long notation capture (e.g. "Nc5xf3") */
     }
     if (move->piece) {
         move->piece |= mycolor;
         return TRUE;
     } else {
         return FALSE;
     }
 }
 static int sendmove(Board board, uint8_t mycolor, int opponent) {
     const size_t buflen = 8;
     char movestr[buflen];
     _Bool remisrejected = FALSE;
     while (1) {
         move(boardy+3, 0);
         if (remisrejected) {
             printw(
                 "Use chess notation to enter your move.\n"
                 "Remis offer rejected - type 'surr' to surrender.      \n\n"
                 "Type your move: ");
         } else {
             printw(
                 "Use chess notation to enter your move.\n"
                 "Or type 'surr' to surrender or 'remis' to offer remis.\n\n"
                 "Type your move: ");
         }
         clrtoeol();
         refresh();
         getnstr(movestr, buflen);
         if (strncmp(movestr, "surr", buflen) == 0) {
             printw("You surrendered!");
             refresh();
             net_send_code(opponent, NETCODE_SURRENDER);
             return 1;
         } else if (strncmp(movestr, "remis", buflen) == 0) {
             if (!remisrejected) {
                 net_send_code(opponent, NETCODE_REMIS);
                 printw("Remis offer sent - waiting for acceptance...");
                 refresh();
                 if (net_recieve_code(opponent) == NETCODE_ACCEPT) {
                     printw("\rRemis accepted!");
                     clrtoeol();
                     refresh();
                     return 1;
                 } else {
                     remisrejected = TRUE;
                 }
             }
         } else {
             Move move;
             if (eval_move(board, mycolor, movestr, &move)) {
                 net_send_code(opponent, NETCODE_MOVE);
                 net_send_data(opponent, &move, sizeof(Move));
                 if (net_recieve_code(opponent) == NETCODE_ACCEPT) {
                     apply_move(board, &move);
                     return 0;
                 } else {
                     printw("Invalid move.");
                     clrtoeol();
                 }
             } else {
                 printw("Can't interpret move - please use algebraic notation.");
             }
         }
     }
 }
 static int recvmove(Board board, uint8_t mycolor, int opponent) {
     while (1) {
         move(boardy+3, 0);
         printw("Awaiting opponent move...");
         clrtoeol();
         refresh();
         // TODO: nonblocking
         uint32_t code = net_recieve_code(opponent);
         Move move;
         switch (code) {
             case NETCODE_SURRENDER:
                 printw("\rYour opponent surrendered!");
                 clrtoeol();
                 return 1;
             case NETCODE_REMIS:
                 if (prompt_yesno(
                     "\rYour opponent offers remis - do you accept")) {
                     printw("\rRemis accepted!");
                     clrtoeol();
                     net_send_code(opponent, NETCODE_ACCEPT);
                     return 1;
                 } else {
                     net_send_code(opponent, NETCODE_DECLINE);
                 }
                 break;
             case NETCODE_MOVE:
                 net_recieve_data(opponent, &move, sizeof(Move));
                 if (validate_move(board, mycolor, &move)) {
                     apply_move(board, &move);
                     net_send_code(opponent, NETCODE_ACCEPT);
                     return 0;
                 } else {
                     net_send_code(opponent, NETCODE_DECLINE);
                 }
         }
     }
 }
 void game_start(Settings *settings, int opponent) {
     _Bool myturn = is_server(settings) ==
         (settings->gameinfo.servercolor == WHITE);
     uint8_t mycolor = myturn ? WHITE:BLACK;
     _Bool running;
     Board board = {
         {WROOK, WKNIGHT, WBISHOP, WQUEEN, WKING, WBISHOP, WKNIGHT, WROOK},
         {WPAWN, WPAWN,   WPAWN,   WPAWN,  WPAWN, WPAWN,   WPAWN,   WPAWN},
         {0,     0,       0,       0,      0,     0,       0,       0},
         {0,     0,       0,       0,      0,     0,       0,       0},
         {0,     0,       0,       0,      0,     0,       0,       0},
         {0,     0,       0,       0,      0,     0,       0,       0},
         {BPAWN, BPAWN,   BPAWN,   BPAWN,  BPAWN, BPAWN,   BPAWN,   BPAWN},
         {BROOK, BKNIGHT, BBISHOP, BQUEEN, BKING, BBISHOP, BKNIGHT, BROOK}
     };
     do {
         clear();
         draw_board(board, mycolor);
         if (myturn) {
             running = !sendmove(board, mycolor, opponent);
         } else {
             running = !recvmove(board, mycolor, opponent);
             flushinp(); // flush any input the user hacked in while waiting
         }
         myturn ^= 1;
     }  while (running);
     mvaddstr(getmaxy(tchess_window)-1, 0,
         "Game has ended. Press any key to leave...");
     getch();
 }

Mercurial > hg > terminal-chess / annotate

src/game.c@4e4f156bba58 (annotated)

src/game.c