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static int current_obstinacy;
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static int current_obstinacy;
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// prototypes of local functions
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// prototypes of local functions
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static void PlayerEngine_Recv (player_t *player);
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static void PlayerEngine_Recv (player_t *player);
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static void PlayerEngine_Send (player_t *player);
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static void PlayerEngine_Send (player_t *player);
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static void Move_BuildString (boardmove_t *move, wchar_t *output_string, int max_length);
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static wchar_t *Move_BuildString (boardmove_t *move);
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bool PlayerEngine_Init (player_t *player)
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bool PlayerEngine_Init (player_t *player)
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{
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{
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   // this function starts a chess engine as a child process. This process's stdin and
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   // this function starts a chess engine as a child process. This process's stdin and
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      // is it NOT a hint, are blunders allowed, should we do one now AND can we do one now ?
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      // is it NOT a hint, are blunders allowed, should we do one now AND can we do one now ?
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      if (!is_hint && (options.engine.blunder_chances > 0) && (rand () % 100 < options.engine.blunder_chances)
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      if (!is_hint && (options.engine.blunder_chances > 0) && (rand () % 100 < options.engine.blunder_chances)
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          && Move_FindRandomMove (&the_board.moves[the_board.move_count - 1], player->color, &move))
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          && Move_FindRandomMove (&the_board.moves[the_board.move_count - 1], player->color, &move))
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      {
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      {
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         Move_DescribeInSAN (&move); // build the forced move string
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         Player_SendBuffer_Add (player, 1000, L"%s %s\n", options.engine.command_force, move.pgntext); // send it to the engine
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         Player_SendBuffer_Add (player, 1000, L"%s %s\n", options.engine.command_force, Move_BuildString (&move)); // send the blunderous move to the engine
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         Player_SendBuffer_Add (player, 1000, L"disp\n");
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         Player_SendBuffer_Add (player, 1000, L"disp\n");
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         Debug_Log (L"===Discarding engine move, forcing a blunderous move (%s) instead===\n", move.pgntext); // blunder
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         Debug_Log (L"===Discarding engine move, forcing a blunderous move (%s) instead===\n", Move_BuildString (&move)); // blunder
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      }
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      }
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      // mark the engine's selected and hovered squares
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      // mark the engine's selected and hovered squares
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      Board_SetSelectedAndHovered (&the_board, move.source[0], move.source[1], move.target[0], move.target[1]);
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      Board_SetSelectedAndHovered (&the_board, move.source[0], move.source[1], move.target[0], move.target[1]);
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            Player_SendBuffer_Add (player, 1000, L"disp\n");
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            Player_SendBuffer_Add (player, 1000, L"disp\n");
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            // instruct it about its allowed search depth BEFORE each move (this ensures engine will be "ready" to handle the command)
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            // instruct it about its allowed search depth BEFORE each move (this ensures engine will be "ready" to handle the command)
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            // then build the move string, and send the move string to the engine
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            // then build the move string, and send the move string to the engine
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            Player_SendBuffer_Add (player, 1000, L"%s %d\n", options.engine.command_sd, options.engine.depth);
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            Player_SendBuffer_Add (player, 1000, L"%s %d\n", options.engine.command_sd, options.engine.depth);
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            Move_BuildString (&the_board.moves[the_board.move_count - 1], line_buffer, WCHAR_SIZEOF (line_buffer));
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            Player_SendBuffer_Add (player, 1000, L"%s\n", line_buffer);
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            Player_SendBuffer_Add (player, 1000, L"%s\n", Move_BuildString (&the_board.moves[the_board.move_count - 1]));
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         }
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         }
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         // else game has not started yet, but it's our turn
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         // else game has not started yet, but it's our turn
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         else
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         else
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            Player_SendBuffer_Add (player, 1000, L"%s\n", options.engine.command_go); // so let's start the game
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            Player_SendBuffer_Add (player, 1000, L"%s\n", options.engine.command_go); // so let's start the game
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   return; // finished
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   return; // finished
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}
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}
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static void Move_BuildString (boardmove_t *move, wchar_t *output_string, int max_length)
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static wchar_t *Move_BuildString (boardmove_t *move)
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{
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{
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   // helper function to build a move string to send to the engine from a particular board move
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   // helper function to build a move string to send to the engine from a particular board move. NOT THREAD SAFE.
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   static wchar_t output_string[8];
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   // construct the four first characters
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   // construct the four first characters
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   swprintf_s (output_string, max_length, L"%c%c%c%c",
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   swprintf_s (output_string, WCHAR_SIZEOF (output_string), L"%c%c%c%c",
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               L'a' + move->source[1], L'1' + move->source[0],
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               L'a' + move->source[1], L'1' + move->source[0],
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               L'a' + move->target[1], L'1' + move->target[0]);
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               L'a' + move->target[1], L'1' + move->target[0]);
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   // append any eventual promotion
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   // append any eventual promotion
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   if (move->promotion_type == PART_ROOK)
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   if (move->promotion_type == PART_ROOK)
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      wcscat_s  (output_string, max_length, L"r");
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      wcscat_s  (output_string, WCHAR_SIZEOF (output_string), L"r");
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   else if (move->promotion_type == PART_KNIGHT)
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   else if (move->promotion_type == PART_KNIGHT)
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      wcscat_s  (output_string, max_length, L"n");
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      wcscat_s  (output_string, WCHAR_SIZEOF (output_string), L"n");
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   else if (move->promotion_type == PART_BISHOP)
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   else if (move->promotion_type == PART_BISHOP)
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      wcscat_s  (output_string, max_length, L"b");
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      wcscat_s  (output_string, WCHAR_SIZEOF (output_string), L"b");
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   else if (move->promotion_type == PART_QUEEN)
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   else if (move->promotion_type == PART_QUEEN)
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      wcscat_s  (output_string, max_length, L"q");
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      wcscat_s  (output_string, WCHAR_SIZEOF (output_string), L"q");
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   return; // finished
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   return (output_string); // finished, return the move string
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}
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}