terminal-chess: comparison src/game.c

-:41468077b5bb
+:52d742aee695
 #include <ncurses.h>
 #include <string.h>
 static const uint8_t boardx = 10, boardy = 10;
-static void draw_board(Board board) {
+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;
 }
 attrset((col == WHITE ? A_BOLD : A_DIM) |
 COLOR_PAIR((y&1)==(x&1) ? COL_WB : COL_BW));
-mvaddch(boardy-y, boardx+x*3, ' ');
+int cy = mycolor == WHITE ? boardy-y : boardy-7+y;
-mvaddch(boardy-y, boardx+x*3+1, piecec);
+int cx = mycolor == WHITE ? boardx+x*3 : boardx+21-x*3;
-mvaddch(boardy-y, boardx+x*3+2, ' ');
+mvaddch(cy, cx, ' ');
+mvaddch(cy, cx+1, piecec);
+mvaddch(cy, cx+2, ' ');
 }
 }
 attrset(A_NORMAL);
 for (uint8_t i = 0 ; i < 8 ; i++) {
-mvaddch(boardy+1, boardx+i*3+1, 'a'+i);
+int x = mycolor == WHITE ? boardx+i*3+1 : boardx+22-i*3;
-mvaddch(boardy-i, boardx-2, '1'+i);
+int y = mycolor == WHITE ? boardy-i : boardy-7+i;
-}
+mvaddch(boardy+1, x, 'a'+i);
-}
+mvaddch(y, boardx-2, '1'+i);
+}
-static int sendmove(int opponent) {
+}
+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;
+}
+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;
+/* is move rule conform */
+// 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 *movestr, Move *move) {
+memset(move, 0, sizeof(Move));
+size_t len = strlen(movestr);
+/* remove check */
+if (movestr[len-1] == '+') {
+len--; movestr[len] = '\0';
+move->check = TRUE;
+}
+if (len == 2) {
+/* pawn move (e.g. "e4") */
+if (isfile(movestr[0]) && isrow(movestr[1])) {
+move->piece = PAWN;
+move->fromfile = move->tofile = fileidx(movestr[0]);
+move->torow = rowidx(movestr[1]);
+move->fromrow = rowidx(movestr[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(movestr, "0-0") == 0) {
+/* king side castling */
+move->piece = KING;
+move->fromfile = fileidx('e');
+move->fromfile = 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) {
+/* queen side castling "O-O-O" */
+/* 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 move[buflen];
+char movestr[buflen];
 _Bool remisrejected = FALSE;
 while (1) {
 move(boardy+3, 0);
 if (remisrejected) {
 "Or type 'surr' to surrender or 'remis' to offer remis.\n\n"
 "Type your move: ");
 }
 clrtoeol();
 refresh();
-getnstr(move, buflen);
+getnstr(movestr, buflen);
-if (strncmp(move, "surr", buflen) == 0) {
+if (strncmp(movestr, "surr", buflen) == 0) {
 printw("You surrendered!");
+refresh();
 net_send_code(opponent, NETCODE_SURRENDER);
 return 1;
-} else if (strncmp(move, "remis", buflen) == 0) {
+} 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 {
-// TODO: validate move syntactically
+Move move;
-// TODO: send move and await acceptance
+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);
-static int recvmove(int opponent) {
+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;
 } else {
 net_send_code(opponent, NETCODE_DECLINE);
 }
 break;
 case NETCODE_MOVE:
-// TODO: receive move
+net_recieve_data(opponent, &move, sizeof(Move));
-// TODO: validate move and accept/reject
+if (validate_move(board, mycolor, &move)) {
-return 0;
+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},
 {BROOK, BKNIGHT, BBISHOP, BQUEEN, BKING, BBISHOP, BKNIGHT, BROOK}
 };
 do {
 clear();
-draw_board(board);
+draw_board(board, mycolor);
 if (myturn) {
-running = !sendmove(opponent);
+running = !sendmove(board, mycolor, opponent);
 } else {
-running = !recvmove(opponent);
+running = !recvmove(board, mycolor, opponent);
 flushinp(); // flush any input the user hacked in while waiting
 }
 myturn ^= 1;
 }  while (running);

Mercurial > hg > terminal-chess / file comparison

comparison: src/game.c

src/game.c