terminal-chess: src/game.c@0c1371488d87 (annotated)

src/game.c@0c1371488d87 (annotated)

src/game.c

Fri, 04 Apr 2014 17:36:42 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 04 Apr 2014 17:36:42 +0200
changeset 28: 0c1371488d87
parent 27: efeb98bc69c9
child 30: a285ee393860
permissions: -rw-r--r--

NEED TESTING: implemented check and checkmate - TODO: avoid checkmate by moving another piece in between

 /*
  * 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 "network.h"
 #include "input.h"
 #include <ncurses.h>
 #include <string.h>
 static const uint8_t boardx = 10, boardy = 10;
 static void draw_board(GameState *gamestate) {
     for (uint8_t y = 0 ; y < 8 ; y++) {
         for (uint8_t x = 0 ; x < 8 ; x++) {
             uint8_t col = gamestate->board[y][x] & COLOR_MASK;
             uint8_t piece = gamestate->board[y][x] & PIECE_MASK;
             char piecec;
             if (piece) {
                 piecec = piece == PAWN ? 'P' : getpiecechr(piece);
             } else {
                 piecec = ' ';
             }
             attrset((col == WHITE ? A_BOLD : A_DIM) |
                 COLOR_PAIR((y&1)==(x&1) ? COL_WB : COL_BW));
             int cy = gamestate->mycolor == WHITE ? boardy-y : boardy-7+y;
             int cx = gamestate->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 = gamestate->mycolor == WHITE ? boardx+i*3+1 : boardx+22-i*3;
         int y = gamestate->mycolor == WHITE ? boardy-i : boardy-7+i;
         mvaddch(boardy+1, x, 'a'+i);
         mvaddch(y, boardx-2, '1'+i);
     }
     /* move log */
     // TODO: introduce window to avoid bugs with a long move log
     uint8_t logy = 0;
     const uint8_t logx = boardx + 30;
     int logi = 1;
     MoveList *logelem = gamestate->movelist;
     while (logelem) {
         logi++;
         if (logi % 2 == 0) {
             if ((logi - 2) % 4 == 0) {
                 logy++;
                 move(logy, logx);
             }
             printw("%d. ", logi / 2);
         }
         if (logelem) {
             Move move = logelem->move;
             if ((move.piece&PIECE_MASK) == KING &&
                 abs(move.tofile-move.fromfile) == 2) {
                 addstr(move.tofile==fileidx('c')?"O-O-O":"O-O");
             } else {
                 char logstr[] = {
                     getpiecechr(move.piece),
                     filechr(move.fromfile), rowchr(move.fromrow),
                     move.capture ? 'x':'\0',
                     filechr(move.tofile), rowchr(move.torow),
                     move.check ? '+' : (move.promotion ? '=' : '\0'),
                     move.promotion ? getpiecechr(move.promotion) : '\0'
                 };
                 for (int stri = 0 ; stri < sizeof(logstr) ; stri++) {
                     if (logstr[stri]) {
                         addch(logstr[stri]);
                     }
                 }
             }
             if (!logelem->next) {
                 if (gamestate->checkmate) {
                     addstr("\b#");
                 } else if (gamestate->stalemate) {
                     addstr(" stalemate");
                 }
             }
             addch(' ');
             logelem = logelem->next;
         }
     }
 }
 static void eval_move_failed_msg(int code) {
     switch (code) {
     case AMBIGUOUS_MOVE:
         printw("Ambiguous move - please specify the piece to move.");
         break;
     case INVALID_POSITION:
         printw("Cannot find the piece that shall be moved.");
         break;
     case NEED_PROMOTION:
         printw("You need to promote the pawn (append \"=Q\" e.g.)!");
         break;
     default:
         printw("Can't interpret move - please use algebraic notation.");
     }
 }
 static int domove_singlemachine(GameState *gamestate) {
     const size_t buflen = 8;
     char movestr[buflen];
     int inputy = getmaxy(stdscr) - 6;
     while (1) {
         move(inputy, 0);
         printw(
             "Use chess notation to enter your move.\n"
             "Or type 'surr' to surrender or 'remis' to end with remis.\n\n"
             "Type your move: ");
         clrtoeol();
         refresh();
         getnstr(movestr, buflen);
         if (strncmp(movestr, "surr", buflen) == 0) {
             printw("%s surrendered!",
                 gamestate->mycolor==WHITE?"White":"Black");
             clrtoeol();
             refresh();
             return 1;
         } else if (strncmp(movestr, "remis", buflen) == 0) {
             printw("Game ends remis.");
             clrtoeol();
             refresh();
             return 1;
         } else {
             Move move;
             int eval_result = eval_move(gamestate, movestr, &move);
             switch (eval_result) {
             case VALID_MOVE_SYNTAX:
                 if (validate_move(gamestate, &move)) {
                     apply_move(gamestate, &move);
                     if (gamestate->checkmate) {
                         printw("Checkmate!");
                         clrtoeol();
                         return 1;
                     } else if (gamestate->stalemate) {
                         printw("Stalemate!");
                         clrtoeol();
                         return 1;
                     } else {
                         return 0;
                     }
                 } else {
                     printw("Invalid move.");
                 }
                 break;
             default:
                 eval_move_failed_msg(eval_result);
             }
             clrtoeol();
         }
     }
 }
 static int sendmove(GameState *gamestate, int opponent) {
     const size_t buflen = 8;
     char movestr[buflen];
     _Bool remisrejected = FALSE;
     uint8_t code;
     int inputy = getmaxy(stdscr) - 6;
     while (1) {
         move(inputy, 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!");
             clrtoeol();
             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;
             int eval_result = eval_move(gamestate, movestr, &move);
             switch (eval_result) {
             case VALID_MOVE_SYNTAX:
                 net_send_data(opponent, NETCODE_MOVE, &move, sizeof(Move));
                 code = net_recieve_code(opponent);
                 move.check = code == NETCODE_CHECK;
                 gamestate->checkmate = code == NETCODE_CHECKMATE;
                 gamestate->stalemate = code == NETCODE_STALEMATE;
                 if (code == NETCODE_DECLINE) {
                     printw("Invalid move.");
                 } else {
                     apply_move(gamestate, &move);
                     if (gamestate->checkmate) {
                         printw("Checkmate!");
                         clrtoeol();
                         return 1;
                     } else if (gamestate->stalemate) {
                         printw("Stalemate!");
                         clrtoeol();
                         return 1;
                     } else {
                         return 0;
                     }
                 }
                 break;
             default:
                 eval_move_failed_msg(eval_result);
             }
             clrtoeol();
         }
     }
 }
 static int recvmove(GameState *gamestate, int opponent) {
     int inputy = getmaxy(stdscr) - 6;
     while (1) {
         move(inputy, 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(gamestate, &move)) {
                     apply_move(gamestate, &move);
                     if (move.check) {
                         net_send_code(opponent, NETCODE_CHECK);
                     } else if (gamestate->checkmate) {
                         net_send_code(opponent, NETCODE_CHECKMATE);
                         printw("\rCheckmate!");
                         clrtoeol();
                         return 1;
                     } else if (gamestate->stalemate) {
                         net_send_code(opponent, NETCODE_STALEMATE);
                         printw("\rStalemate!");
                         clrtoeol();
                         return 1;
                     } else {
                         net_send_code(opponent, NETCODE_ACCEPT);
                     }
                     return 0;
                 } else {
                     net_send_code(opponent, NETCODE_DECLINE);
                 }
         }
     }
 }
 static void init_board(GameState *gamestate) {
     Board initboard = {
         {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}
     };
     memcpy(gamestate->board, initboard, sizeof(Board));
 }
 void game_start_singlemachine(Settings *settings) {
     GameState gamestate;
     memset(&gamestate, 0, sizeof(GameState));
     init_board(&gamestate);
     gamestate.mycolor = WHITE;
     // TODO: time limit
     _Bool running;
     do {
         clear();
         draw_board(&gamestate);
         running = !domove_singlemachine(&gamestate);
         gamestate.mycolor = opponent_color(gamestate.mycolor);
     }  while (running);
     move(0,0);
     draw_board(&gamestate);
     gamestate_cleanup(&gamestate);
     mvaddstr(getmaxy(stdscr)-1, 0,
         "Game has ended. Press any key to leave...");
     refresh();
     getch();
 }
 void game_start(Settings *settings, int opponent) {
     _Bool myturn = is_server(settings) ==
         (settings->gameinfo.servercolor == WHITE);
     // TODO: time limit
     GameState gamestate;
     memset(&gamestate, 0, sizeof(GameState));
     init_board(&gamestate);
     gamestate.mycolor = myturn ? WHITE:BLACK;
     _Bool running;
     do {
         clear();
         draw_board(&gamestate);
         if (myturn) {
             running = !sendmove(&gamestate, opponent);
         } else {
             running = !recvmove(&gamestate, opponent);
             flushinp(); // flush any input the user hacked in while waiting
         }
         myturn ^= TRUE;
     }  while (running);
     move(0,0);
     draw_board(&gamestate);
     gamestate_cleanup(&gamestate);
     mvaddstr(getmaxy(stdscr)-1, 0,
         "Game has ended. Press any key to leave...");
     refresh();
     getch();
 }

Mercurial > hg > terminal-chess / annotate

src/game.c@0c1371488d87 (annotated)

src/game.c