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// square.c
// includes
#include "colour.h"
#include "square.h"
#include "util.h"
// "constants"
static const uint8 SquareFrom64[64] = {
A1, B1, C1, D1, E1, F1, G1, H1,
A2, B2, C2, D2, E2, F2, G2, H2,
A3, B3, C3, D3, E3, F3, G3, H3,
A4, B4, C4, D4, E4, F4, G4, H4,
A5, B5, C5, D5, E5, F5, G5, H5,
A6, B6, C6, D6, E6, F6, G6, H6,
A7, B7, C7, D7, E7, F7, G7, H7,
A8, B8, C8, D8, E8, F8, G8, H8,
};
// variables
static sint8 SquareTo64[SquareNb];
// functions
// square_init()
void square_init() {
int sq;
for (sq = 0; sq < SquareNb; sq++) SquareTo64[sq] = -1;
for (sq = 0; sq < 64; sq++) {
SquareTo64[SquareFrom64[sq]] = sq;
}
}
// square_is_ok()
bool square_is_ok(int square) {
if (square < 0 || square >= SquareNb) return FALSE;
if (SquareTo64[square] < 0) return FALSE;
return TRUE;
}
// square_make()
int square_make(int file, int rank) {
int sq_64;
ASSERT(file>=0&&file<8);
ASSERT(rank>=0&&rank<8);
sq_64 = (rank << 3) | file;
return square_from_64(sq_64);
}
// square_file()
int square_file(int square) {
int file;
ASSERT(square_is_ok(square));
file = (square - 4) & 7;
ASSERT(file==(square_to_64(square)&7));
return file;
}
// square_rank()
int square_rank(int square) {
int rank;
ASSERT(square_is_ok(square));
rank = (square >> 4) - 2;
ASSERT(rank==square_to_64(square)>>3);
return rank;
}
// square_side_rank()
int square_side_rank(int square, int colour) {
int rank;
ASSERT(square_is_ok(square));
ASSERT(colour_is_ok(colour));
rank = square_rank(square);
if (colour_is_black(colour)) rank = 7-rank;
return rank;
}
// square_from_64()
int square_from_64(int square) {
ASSERT(square>=0&&square<64);
return SquareFrom64[square];
}
// square_to_64()
int square_to_64(int square) {
ASSERT(square_is_ok(square));
return SquareTo64[square];
}
// square_is_promote()
bool square_is_promote(int square) {
int rank;
ASSERT(square_is_ok(square));
rank = square_rank(square);
return rank == Rank1 || rank == Rank8;
}
// square_ep_dual()
int square_ep_dual(int square) {
ASSERT(square_is_ok(square));
ASSERT(square_rank(square)>=2&&square_rank(square)<=5);
return square ^ 16;
}
// square_colour()
int square_colour(int square) {
ASSERT(square_is_ok(square));
return (square ^ (square >> 4)) & 1;
}
// file_from_char()
int file_from_char(int c) {
ASSERT(c>='a'&&c<='h');
return c - 'a';
}
// rank_from_char()
int rank_from_char(int c) {
ASSERT(c>='1'&&c<='8');
return c - '1';
}
// file_to_char()
int file_to_char(int file) {
ASSERT(file>=0&&file<8);
return 'a' + file;
}
// rank_to_char()
int rank_to_char(int rank) {
ASSERT(rank>=0&&rank<8);
return '1' + rank;
}
// char_is_file()
bool char_is_file(int c) {
return c >= 'a' && c <= 'h';
}
// char_is_rank()
bool char_is_rank(int c) {
return c >= '1' && c <= '8';
}
// square_to_string()
bool square_to_string(int square, char string[], int size) {
ASSERT(square_is_ok(square));
ASSERT(string!=NULL);
ASSERT(size>=3);
if (size < 3) return FALSE;
string[0] = 'a' + square_file(square);
string[1] = '1' + square_rank(square);
string[2] = '\0';
return TRUE;
}
// square_from_string()
int square_from_string(const char string[]) {
int file, rank;
ASSERT(string!=NULL);
if (string[0] < 'a' || string[0] > 'h') return SquareNone;
if (string[1] < '1' || string[1] > '8') return SquareNone;
if (string[2] != '\0') return SquareNone;
file = file_from_char(string[0]);
rank = rank_from_char(string[1]);
return square_make(file,rank);
}
// end of square.cpp
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