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WIP refactor

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Ole Morud
2023-03-22 20:35:43 +01:00
parent 39f9d848b5
commit f18c9215e5
11 changed files with 464 additions and 430 deletions
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2
.gitignore vendored
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@@ -1,2 +1,2 @@
chess chess
doc/ docs/

5
Makefile
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@@ -2,10 +2,13 @@
CC = clang CC = clang
CFLAGS = -Ofast -fsanitize=address -static-libsan -ggdb3 -Wall -Wextra -Werror CFLAGS = -Ofast -fsanitize=address -static-libsan -ggdb3 -Wall -Wextra -Werror
.PHONY: all run gdb clean .PHONY: all run gdb clean docs
all: bin/chess all: bin/chess
docs:
doxygen doxygen-config
clean: clean:
rm bin/* rm bin/*

435
chess.c
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@@ -1,73 +1,16 @@
#include <ctype.h> /* isalpha, isdigit ... */ #include <ctype.h> /* isalpha, isdigit ... */
#include <locale.h> /* setlocale */ #include <locale.h> /* setlocale */
#include <stdbool.h> /* true, false */
#include <stdint.h> /* int32_t */
#include <stdio.h> /* printf, scanf */ #include <stdio.h> /* printf, scanf */
#include <string.h> /* memcpy */ #include <string.h> /* memcpy */
/** Type representing piece/tile on a chessboard */ #include "common.h"
typedef int32_t tile_t; #include "graphics.h"
#include "pieces.h"
/** Type representing index of a chessboard tile */
typedef ssize_t index_t;
#define ROW ((index_t)8)
#define COL ((index_t)1)
#define BOARD_SIZE ((index_t)(8 * 8))
#define E ((tile_t)0) ///< empty tile
#define K ((tile_t)1) ///< king
#define Q ((tile_t)2) ///< queen
#define R ((tile_t)3) ///< rook
#define B ((tile_t)4) ///< bishop
#define N ((tile_t)5) ///< knight
#define P ((tile_t)6) ///< pawn
/** Set background to dark blue */
#define BG_DARKBLUE() setcolor(0, 100, 100, 150)
/** Set background to light blue */
#define BG_LIGHTBLUE() setcolor(0, 150, 150, 200)
/** Set foreground to black */
#define FG_BLACK() setcolor(1, 0, 0, 0)
/** Set foreground to white */
#define FG_WHITE() setcolor(1, 0xff, 0xff, 0xff)
#define WHITE 1
#define BLACK -1
/** 0x2659 == ♙ */
#define UNICODE_CHESS_SYMBOL 0x2659
bool bishop_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool cardinal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool diagonal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool king_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool knight_move_ok(index_t from, index_t to);
bool move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player);
bool pawn_move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player);
bool queen_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool rook_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
bool tile_empty(tile_t t);
index_t abs_pos(index_t p);
index_t column(index_t i);
index_t row(index_t i);
index_t get_piece(char input[2]);
tile_t abs_tile(tile_t t);
void do_turn(int turn_no, tile_t board[BOARD_SIZE]); void do_turn(int turn_no, tile_t board[BOARD_SIZE]);
void init_board(tile_t board[BOARD_SIZE]); void init_board(tile_t board[BOARD_SIZE]);
void print_board(const tile_t board[BOARD_SIZE]); index_t input_to_index(char input[2]);
void setcolor(int mode, int r, int g, int b);
int main() int main()
{ {
@@ -89,75 +32,6 @@ int main()
return 0; return 0;
} }
/**
* Sets the foreground or background color for subsequent writes.
*
* Uses Select Graphic Renditions (SGR) to set the color of the terminal output.
* See https://en.wikipedia.org/wiki/ANSI_escape_code#24-bit for more details.
*
* \param mode 0 - change background, 1 - change foreground, 2 - reset colors
* \param r amount of red (0 to 255)
* \param b amount of blue (0 to 255)
* \param g amount of green (0 to 255)
*/
void setcolor(const int mode, const int r, const int g, const int b)
{
if (mode == 2)
printf("\033[0m");
else
printf("\033[%i;2;%i;%i;%im", mode ? 38 : 48, r, g, b);
};
/**
* Prints the board
*
* Uses unicode symbols and ANSI escape features to print a chessboard on the
* display.
*
* \param board A pointer to a list of tiles representing the board state
*
* */
void print_board(const tile_t board[BOARD_SIZE])
{
/* https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode
The unicode symbols for the pieces are calculated from adding
0x2653 (#define'd as UNICODE_CHESS_SYMBOL) with the piece value. */
for (size_t i = 0; i < 8; i++) {
printf("\n %zu ", 8 - i); // number coordinates
for (size_t j = 0; j < 8; j++) {
tile_t t = board[i * 8 + j];
if ((i + j) % 2)
BG_DARKBLUE();
else
BG_LIGHTBLUE();
if (tile_empty(t)) {
printf(" ");
continue;
}
if (t > 0)
FG_WHITE();
else
FG_BLACK();
printf("%lc ", UNICODE_CHESS_SYMBOL + abs_tile(t));
}
setcolor(2, 0, 0, 0); // reset text attributes
}
/* horizontal letter coordinates */
printf("\n ");
for (int i = 0; i < 8; i++)
printf(" %c", 'a' + i);
}
/** /**
* Resets/initializes the board * Resets/initializes the board
* *
@@ -199,7 +73,7 @@ void do_turn(int turn_no, tile_t board[BOARD_SIZE])
printf("\nMove piece\nfrom: "); printf("\nMove piece\nfrom: ");
scanf(" %2s", input); scanf(" %2s", input);
tmp = get_piece(input); tmp = input_to_index(input);
if (tmp == -1) if (tmp == -1)
continue; continue;
@@ -208,7 +82,7 @@ void do_turn(int turn_no, tile_t board[BOARD_SIZE])
printf("\nto: "); printf("\nto: ");
scanf(" %2s", input); scanf(" %2s", input);
tmp = get_piece(input); tmp = input_to_index(input);
if (tmp == -1) if (tmp == -1)
continue; continue;
@@ -231,7 +105,7 @@ void do_turn(int turn_no, tile_t board[BOARD_SIZE])
* \param input string of length 2 representing tile, e.g. "A3" * \param input string of length 2 representing tile, e.g. "A3"
* *
* */ * */
index_t get_piece(char input[2]) index_t input_to_index(char input[2])
{ {
int x = -1, y = -1, c; int x = -1, y = -1, c;
@@ -253,298 +127,3 @@ index_t get_piece(char input[2])
return -1; return -1;
} }
/**
* Returns the absolute value of an index_t value
*
* \param p positive or negative index_t
*/
index_t abs_pos(index_t p)
{
if (p < 0)
return -1 * p;
return p;
}
/**
* Returns the absolute value of a tile_t value
*
* \param t positive or negative tile_t
* */
tile_t abs_tile(tile_t t)
{
if (t < 0)
return -1 * t;
return t;
}
/**
* Returns true if tile is empty, false otherwise
*
* \param t tile to check if empty
* */
bool tile_empty(tile_t t)
{
return t == E;
}
/**
* Returns row number of 1D board index
*
* \param i index to get row number of
* */
index_t row(index_t i)
{
return i / ROW;
}
/**
* Returns column number of board index
*
* \param i index to get column number of
* */
index_t column(index_t i)
{
return i % ROW;
}
/**
* Returns true if a and b are tiles of opposite player, false otherwise
*
* \param a Tile to compare
* \param b Tile to compare it with
* */
bool opposite_color(tile_t a, tile_t b)
{
return a * b < 0;
}
/**
* Returns true if a and b are pieces of the same color
*
* \param a Tile to compare
* \param b Tile to compare it with
* */
bool same_color(tile_t a, tile_t b)
{
return a * b > 0;
}
/**
* Returns true if a move is valid, false otherwise
*
* \param board Pointer to list of tiles representing board state
* \param from Tile to move piece from
* \param to Tile to move piece to
* \param player The current player to move
* */
bool move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
const int player)
{
/* player must own piece it moves */
if (board[from] * player < 0) {
printf("\nYou do not own this piece");
return false;
}
if (tile_empty(board[from])) {
printf("Can't move from empty tile");
return false;
}
/* player can't take own pieces or move piece onto itself*/
if (same_color(board[from], board[to])) {
printf("\nYou can't take your own pieces");
return false;
}
/* check piece specific moves */
switch (abs_tile(board[from])) {
case P:
return pawn_move_ok(board, from, to, player);
case B:
return bishop_move_ok(board, from, to);
case R:
return rook_move_ok(board, from, to);
case N:
return knight_move_ok(from, to);
case K:
return king_move_ok(board, from, to);
case Q:
return queen_move_ok(board, from, to);
}
return false;
}
/**
* Returns true if move is a valid pawn move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece starts at
* \param to Index of board piece wants to move to
* \param player Player to move
*/
bool pawn_move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player)
{
const index_t diff = (to - from) * -player;
switch (diff) {
default:
return false;
case ROW: /* single move */
return tile_empty(board[to]);
case ROW - 1:
case ROW + 1: /* diagonal attack */
return opposite_color(board[to], board[from]);
case 2 * ROW: /* double move */
return tile_empty(board[to]) && tile_empty(board[from - ROW * player])
&& (row(from) == 1 || row(from) == 6);
}
}
/**
* Returns true if `to` is on a diagonal line of `from`, false otherwise
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool diagonal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t col_diff = column(to) - column(from);
const index_t row_diff = row(to) - row(from);
const index_t x_step = col_diff / abs_pos(col_diff);
const index_t y_step = ROW * row_diff / abs_pos(row_diff);
const index_t step = x_step + y_step;
if (abs_pos(col_diff) != abs_pos(row_diff)) {
printf("\nNot a diagonal move");
return false;
}
for (index_t p = from + step; p != to; p += step) {
if (! tile_empty(board[p])) {
printf("\nCan't jump over pieces");
return false;
}
}
return true;
}
/**
* Returns true if index `to` is on a cardinal line of `from`, false otherwise
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool cardinal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t col_diff = column(to) - column(from);
const index_t row_diff = row(to) - row(from);
if (row_diff > 0 && col_diff > 0)
printf("Must move in a straight line");
index_t step;
if (row_diff)
step = ROW * row_diff / abs_pos(row_diff);
else
step = col_diff / abs_pos(col_diff);
for (index_t p = from + step; p != to; p += step) {
if (! tile_empty(board[p])) {
printf("\ncan't jump over pieces");
return false;
}
}
return true;
}
/**
* Returns true if move is a valid bishop move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool bishop_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return diagonal_move_ok(board, from, to);
}
/**
* Returns true if move is a valid rook move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool rook_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return cardinal_move_ok(board, from, to);
}
/**
* Returns true if move is a valid knight move
*
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool knight_move_ok(index_t from, index_t to)
{
const index_t abs_col_diff = abs_pos(column(to) - column(from));
const index_t abs_row_diff = abs_pos(row(to) - row(from));
return (abs_col_diff == 1 && abs_row_diff == 2)
|| (abs_col_diff == 2 && abs_row_diff == 1);
}
/**
* Returns true if move is a valid king move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool king_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t abs_col_diff = abs_pos(column(to) - column(from));
const index_t abs_row_diff = abs_pos(row(to) - row(from));
(void)board;
return abs_col_diff <= 1 && abs_row_diff <= 1;
}
/**
* Returns true if move is a valid queen move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool queen_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return diagonal_move_ok(board, from, to)
|| cardinal_move_ok(board, from, to);
}

0
common.c Normal file
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26
common.h Normal file
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@@ -0,0 +1,26 @@
#include <stdint.h> /* int32_t */
#include <stddef.h> /* ptrdiff_t */
#include <stdbool.h> /* true, false, bool */
/** Type representing piece/tile on a chessboard */
typedef int32_t tile_t;
/** Type representing index of a chessboard tile */
typedef ptrdiff_t index_t;
#define BOARD_SIZE ((index_t)(8 * 8))
#define WHITE 1
#define BLACK -1
#define E ((tile_t)0) ///< empty tile
#define K ((tile_t)1) ///< king
#define Q ((tile_t)2) ///< queen
#define R ((tile_t)3) ///< rook
#define B ((tile_t)4) ///< bishop
#define N ((tile_t)5) ///< knight
#define P ((tile_t)6) ///< pawn
#define ROW ((index_t)8)
#define COL ((index_t)1)

92
graphics.c Normal file
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@@ -0,0 +1,92 @@
#include "graphics.h"
#include "common.h"
#include "util.h"
#include <stdio.h>
/** Set background to dark blue */
#define BG_DARKBLUE() setcolor(0, 100, 100, 150)
/** Set background to light blue */
#define BG_LIGHTBLUE() setcolor(0, 150, 150, 200)
/** Set foreground to black */
#define FG_BLACK() setcolor(1, 0, 0, 0)
/** Set foreground to white */
#define FG_WHITE() setcolor(1, 0xff, 0xff, 0xff)
/** 0x2659 == ♙ */
#define UNICODE_CHESS_SYMBOL 0x2659
static inline void setcolor(const int mode, const int r, const int g, const int b);
/**
* Sets the foreground or background color for subsequent writes.
*
* Uses Select Graphic Renditions (SGR) to set the color of the terminal output.
* See https://en.wikipedia.org/wiki/ANSI_escape_code#24-bit for more details.
*
* \param mode 0 - change background, 1 - change foreground, 2 - reset colors
* \param r amount of red (0 to 255)
* \param b amount of blue (0 to 255)
* \param g amount of green (0 to 255)
*/
static inline void setcolor(const int mode, const int r, const int g, const int b)
{
if (mode == 2)
printf("\033[0m");
else
printf("\033[%i;2;%i;%i;%im", mode ? 38 : 48, r, g, b);
};
/**
* Prints the board
*
* Uses unicode symbols and ANSI escape features to print a chessboard on the
* display.
*
* \param board A pointer to a list of tiles representing the board state
*
* */
void print_board(const tile_t board[BOARD_SIZE])
{
/* https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode
The unicode symbols for the pieces are calculated from adding
0x2653 (#define'd as UNICODE_CHESS_SYMBOL) with the piece value. */
for (size_t i = 0; i < 8; i++) {
printf("\n %zu ", 8 - i); // number coordinates
for (size_t j = 0; j < 8; j++) {
tile_t t = board[i * 8 + j];
if ((i + j) % 2)
BG_DARKBLUE();
else
BG_LIGHTBLUE();
if (tile_empty(t)) {
printf(" ");
continue;
}
if (t > 0)
FG_WHITE();
else
FG_BLACK();
printf("%lc ", UNICODE_CHESS_SYMBOL + abs_tile(t));
}
setcolor(2, 0, 0, 0); // reset text attributes
}
/* horizontal letter coordinates */
printf("\n ");
for (int i = 0; i < 8; i++)
printf(" %c", 'a' + i);
}

8
graphics.h Normal file
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@@ -0,0 +1,8 @@
#ifndef GRAPHICS_H
#define GRAPHICS_H
#include "common.h"
void print_board(const tile_t board[BOARD_SIZE]);
#endif

221
pieces.c Normal file
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@@ -0,0 +1,221 @@
#include "common.h"
#include "util.h"
static bool bishop_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
static bool cardinal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
static bool diagonal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
static bool king_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
static bool knight_move_ok(index_t from, index_t to);
static bool pawn_move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player);
static bool queen_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
static bool rook_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to);
/**
* Returns true if move is a valid pawn move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece starts at
* \param to Index of board piece wants to move to
* \param player Player to move
*/
bool pawn_move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player)
{
const index_t diff = (to - from) * -player;
switch (diff) {
default:
return false;
case ROW: /* single move */
return tile_empty(board[to]);
case ROW - 1:
case ROW + 1: /* diagonal attack */
return opposite_color(board[to], board[from]);
case 2 * ROW: /* double move */
return tile_empty(board[to]) && tile_empty(board[from - ROW * player])
&& (row(from) == 1 || row(from) == 6);
}
}
/**
* Returns true if `to` is on a diagonal line of `from`, false otherwise
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool diagonal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t col_diff = column(to) - column(from);
const index_t row_diff = row(to) - row(from);
const index_t x_step = col_diff / abs_pos(col_diff);
const index_t y_step = ROW * row_diff / abs_pos(row_diff);
const index_t step = x_step + y_step;
if (abs_pos(col_diff) != abs_pos(row_diff))
return false;
for (index_t p = from + step; p != to; p += step) {
if (! tile_empty(board[p]))
return false;
}
return true;
}
/**
* Returns true if index `to` is on a cardinal line of `from`, false otherwise
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool cardinal_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t col_diff = column(to) - column(from);
const index_t row_diff = row(to) - row(from);
/* cardinal moves means one direction has to be zero */
if (row_diff > 0 && col_diff > 0)
return false;
index_t step = row_diff ?
ROW * row_diff / abs_pos(row_diff)
: col_diff / abs_pos(col_diff);
for (index_t p = from + step; p != to; p += step) {
if (! tile_empty(board[p]))
return false;
}
return true;
}
/**
* Returns true if move is a valid bishop move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool bishop_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return diagonal_move_ok(board, from, to);
}
/**
* Returns true if move is a valid rook move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool rook_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return cardinal_move_ok(board, from, to);
}
/**
* Returns true if move is a valid knight move
*
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool knight_move_ok(index_t from, index_t to)
{
const index_t c = abs_pos(column(to) - column(from));
const index_t r = abs_pos(row(to - from));
return (c == 1 && r == 2)
|| (c == 2 && r == 1);
}
/**
* Returns true if move is a valid king move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool king_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
const index_t abs_col_diff = abs_pos(column(to) - column(from));
const index_t abs_row_diff = abs_pos(row(to) - row(from));
(void)board;
return abs_col_diff <= 1 && abs_row_diff <= 1;
}
/**
* Returns true if move is a valid queen move
*
* \param board Array of tiles representing chess board state
* \param from Index of board piece is at
* \param to Index of board piece tries to move to
*/
bool queen_move_ok(const tile_t board[BOARD_SIZE], index_t from, index_t to)
{
return diagonal_move_ok(board, from, to)
|| cardinal_move_ok(board, from, to);
}
/**
* Returns true if a move is valid, false otherwise
*
* \param board Pointer to list of tiles representing board state
* \param from Tile to move piece from
* \param to Tile to move piece to
* \param player The current player to move
* */
bool move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
int player)
{
/* player must own piece it moves */
if (board[from] * player < 0)
return false;
if (tile_empty(board[from]))
return false;
/* player can't take own pieces or move piece onto itself*/
if (same_color(board[from], board[to]))
return false;
/* check piece specific moves */
switch (abs_tile(board[from])) {
case P:
return pawn_move_ok(board, from, to, player);
case B:
return bishop_move_ok(board, from, to);
case R:
return rook_move_ok(board, from, to);
case N:
return knight_move_ok(from, to);
case K:
return king_move_ok(board, from, to);
case Q:
return queen_move_ok(board, from, to);
}
return false;
}

13
pieces.h Normal file
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@@ -0,0 +1,13 @@
#ifndef PIECES_H
#define PIECES_H
#include "common.h"
bool move_ok(const tile_t board[BOARD_SIZE],
index_t from,
index_t to,
const int player);
#endif

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#include "util.h"
/**
* Returns the absolute value of an index_t value
*
* \param p positive or negative index_t
*/
index_t abs_pos(index_t p)
{
if (p < 0)
return -1 * p;
return p;
}
/**
* Returns the absolute value of a tile_t value
*
* \param t positive or negative tile_t
* */
tile_t abs_tile(tile_t t)
{
if (t < 0)
return -1 * t;
return t;
}
/**
* Returns true if tile is empty, false otherwise
*
* \param t tile to check if empty
* */
bool tile_empty(tile_t t)
{
return t == E;
}
/**
* Returns row number of 1D board index
*
* \param i index to get row number of
* */
index_t row(index_t i)
{
return i / ROW;
}
/**
* Returns column number of board index
*
* \param i index to get column number of
* */
index_t column(index_t i)
{
return i % ROW;
}
/**
* Returns true if a and b are tiles of opposite color, false otherwise
*
* \param a Tile to compare
* \param b Tile to compare it with
* */
bool opposite_color(tile_t a, tile_t b)
{
return a * b < 0;
}
/**
* Returns true if a and b are pieces of the same color, false otherwise
*
* \param a Tile to compare
* \param b Tile to compare it with
* */
bool same_color(tile_t a, tile_t b)
{
return a * b > 0;
}

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#include "common.h"
bool tile_empty(tile_t t);
index_t abs_pos(index_t p);
index_t column(index_t i);
index_t row(index_t i);
tile_t abs_tile(tile_t t);
bool same_color(tile_t a, tile_t b);
bool opposite_color(tile_t a, tile_t b);