130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
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#include <ctype.h> /* isalpha, isdigit ... */
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#include <locale.h> /* setlocale */
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#include <stdio.h> /* printf, scanf */
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#include <string.h> /* memcpy */
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#include "common.h"
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#include "graphics.h"
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#include "pieces.h"
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void do_turn(int turn_no, tile_t board[BOARD_SIZE]);
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void init_board(tile_t board[BOARD_SIZE]);
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index_t input_to_index(char input[2]);
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int main()
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{
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int turn = 0;
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setlocale(LC_ALL, "C.UTF-8");
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tile_t board[8 * 8] = { 0 };
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init_board(board);
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while (true) {
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printf("\033[2J"); // clear screen
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print_board(board);
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do_turn(turn, board);
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++turn;
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}
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return 0;
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}
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/**
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* Resets/initializes the board
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*
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* Sets all the tiles of the board to match the starting position of chess.
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*
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* \param board Pointer to list of tiles representing board state
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*/
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void init_board(tile_t board[BOARD_SIZE])
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{
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// black pieces are prefixed by a minus (-)
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const tile_t start[]
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= { -R, -N, -B, -Q, -K, -B, -N, -R, -P, -P, -P, -P, -P, -P, -P, -P,
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E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E,
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E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E,
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P, P, P, P, P, P, P, P, R, N, B, Q, K, B, N, R };
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memcpy(board, start, sizeof(start));
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}
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// TODO: Implement algebaric notation
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/** Asks for move, validates move and does move if valid
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*
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* \param turn_no Turn number, is increased between every `do_turn` elsewhere
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* \param board Pointer to list of tiles representing board state
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* */
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void do_turn(int turn_no, tile_t board[BOARD_SIZE])
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{
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char input[3] = { 0 };
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int from = -1, to = -1, tmp;
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printf("\nPlayer %i, your turn to move", 1 + turn_no % 2);
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/* temporary and ugly solution - read from and to */
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while (from == -1 || to == -1) {
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from = -1;
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to = -1;
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printf("\nMove piece\nfrom: ");
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scanf(" %2s", input);
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tmp = input_to_index(input);
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if (tmp == -1)
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continue;
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from = tmp;
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printf("\nto: ");
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scanf(" %2s", input);
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tmp = input_to_index(input);
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if (tmp == -1)
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continue;
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to = tmp;
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if (! move_ok(board, from, to, turn_no % 2 ? BLACK : WHITE)) {
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from = -1;
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continue;
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}
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}
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board[to] = board[from];
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board[from] = E;
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}
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/**
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* Translates A1, 3B etc. to the 1D index of the board
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*
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* \param input string of length 2 representing tile, e.g. "A3"
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*
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* */
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index_t input_to_index(char input[2])
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{
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int x = -1, y = -1, c;
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for (int i = 0; i < 2; i++) {
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c = input[i];
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if (isalpha(c))
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c = toupper(input[0]);
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if ('A' <= c && c <= 'H')
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x = c - 'A';
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else if ('1' <= c && c <= '8')
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y = c - '1';
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}
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if (x != -1 && y != -1)
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return 8 * (7 - y) + x;
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else
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return -1;
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}
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