2023-11-12 19:34:40 +09:00
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2023-11-12 19:57:13 +09:00
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#include <curses.h>
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2023-11-12 19:34:40 +09:00
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2023-11-12 19:57:13 +09:00
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struct ut_state
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{
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char tiles[9][9];
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char boards[3][3];
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int playBoard;
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char player;
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};
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char ut_turn(char player)
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{
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switch(player)
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{
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case 'X': return 'O';
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case 'O': return 'X';
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default: return '\0';
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}
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}
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#define T(r, c) (tiles[offset + stride * r + c])
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char ut_winner(char *tiles, int offset, int stride) {
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2023-11-12 19:57:13 +09:00
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// whoreizontal wins
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for (int y = 0; y < 3; y++)
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{
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char tile = T(y, 0);
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if (tile == '\0') {continue;}
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if (tile == T(y, 1) && tile == T(y, 2)) {return tile;}
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}
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// vertical wins
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for (int x = 0; x < 3; x++)
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{
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char tile = T(0, x);
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if (tile == '\0') {continue;}
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if (tile == T(1, x) && tile == T(2, x)) {return tile;}
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}
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// diagonalz
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char tile = T(1, 1);
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if (tile == '\0') {return '\0';}
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if (tile == T(0, 0) && tile == T(2, 2)) {return tile;}
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if (tile == T(2, 0) && tile == T(0, 2)) {return tile;}
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2023-11-12 20:39:43 +09:00
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// check for draw
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for (int y = 0; y < 3; y++) {
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for (int x = 0; x < 3; x++) {
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if (T(x, y) == '\0') {
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// tile is empty - not a draw
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return '\0';
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}
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}
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}
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// draw
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return -1;
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}
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int ut_move(struct ut_state *new_state, const struct ut_state *old_state, int row, int col)
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{
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// bad move - out of bounds
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if(row < 0 || row >= 9 || col < 0 || col >= 9) {return 1;}
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// state->playBoard == -1 means all boards playable; otherwise only one board is playable
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if (old_state->playBoard != -1 && old_state->playBoard != 3 * (row / 3) + (col / 3)) {return 1;}
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// bad move - tile is occupied
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if(old_state->tiles[row][col] != '\0') {return 1;} // replace with ' ' maybe
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// copy old_state->{tiles,boards} to new_state->{tiles,boards}
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memmove(new_state->tiles, old_state->tiles, sizeof(old_state->tiles));
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memmove(new_state->boards, old_state->boards, sizeof(old_state->boards));
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// do move
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new_state->tiles[row][col] = old_state->player;
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new_state->boards[row / 3][col / 3] = ut_winner((char *)new_state->tiles, 27 * (row % 3) + 3 * (col % 3), 9);
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// next play board - if next play board is not playable, play any board
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new_state->playBoard = new_state->boards[row % 3][col % 3] == '\0' ? 3 * (row % 3) + (col % 3) : -1;
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new_state->player = ut_turn(old_state->player);
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return 0;
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}
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2023-11-12 20:00:19 +09:00
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void ut_show(const struct ut_state *state) {
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#define tiles state->tiles
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printf("Turn: %c\nPlay board: %d\n", (int)state->player, state->playBoard);
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int play_board_row = -1;
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int play_board_col = -1;
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if (state->playBoard != -1) {
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play_board_row = state->playBoard / 3;
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play_board_col = state->playBoard % 3;
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}
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printf(" 012 345 678\n");
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for(int y = 0; y < 9; y++)
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{
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if (y == 3 || y == 6) {
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printf(" ---+---+---\n");
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}
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printf("%d ", y);
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for(int x = 0; x < 9; x++)
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{
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if (x == 3 || x == 6) {
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putchar('|');
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}
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putchar(tiles[y][x] ? tiles[y][x] : ' ');
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}
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if (y / 3 == play_board_row) {
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printf("<");
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}
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putchar('\n');
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}
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if (play_board_col != -1) {
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printf(" ");
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for (int i = 0; i < play_board_col; i++) {
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printf(" ");
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}
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printf("^^^");
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putchar('\n');
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}
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putchar('\n');
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#undef tiles
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}
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bool getpos(const struct ut_state *state, int *x, int *y) {
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while (true) {
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printf("Place token %c at position x,y: ", state->player);
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char line[5] = {0};
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if (fgets(line, 5, stdin) == NULL)
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return false;
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// line was too short
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if (line[3] == '\0')
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continue;
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// line was too long
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if (line[3] != '\n') {
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// consume rest of line
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while (true) {
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int garbage = getchar();
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if (garbage == EOF)
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return false;
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if (garbage == '\n')
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break;
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}
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continue;
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}
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int sscanf_result = sscanf(line, "%d,%d", x, y);
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if (sscanf_result == EOF)
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return false;
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if (sscanf_result != 2)
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continue;
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break;
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}
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return true;
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}
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int main(int *argc, char **argv) {
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struct ut_state state = {
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.boards = {0},
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.tiles = {0},
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.playBoard = -1,
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.player = 'X'
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};
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while (true) {
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int x, y;
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ut_show(&state);
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bool ok = getpos(&state, &y, &x);
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if (!ok) {continue;}
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int err = ut_move(&state, &state, x, y);
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if (err) {continue;}
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char w = ut_winner((char *)state.boards, 0, 3);
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if(w)
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{
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printf("\n%c Wins!\n", (int)w);
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return 0;
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}
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}
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return 0;
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}
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