37    int piece;  in piece_init()  local
39    for (piece = 0; piece < 256; piece++) PieceTo12[piece] = -1;  in piece_init()
41    for (piece = 0; piece < 12; piece++) {  in piece_init()
42       PieceTo12[PieceFrom12[piece]] = piece;  in piece_init()
48 bool piece_is_ok(int piece) {  in piece_is_ok()  argument
50    if (piece < 0 || piece >= 256) return FALSE;  in piece_is_ok()
52    if (PieceTo12[piece] < 0) return FALSE;  in piece_is_ok()
68 int piece_pawn_opp(int piece) {  in piece_pawn_opp()  argument
70    ASSERT(piece==BlackPawn256||piece==WhitePawn256);  in piece_pawn_opp()
72    return piece ^ 15;  in piece_pawn_opp()
77 int piece_colour(int piece) {  in piece_colour()  argument
79    ASSERT(piece_is_ok(piece));  in piece_colour()
81    return piece & 3;  in piece_colour()
86 int piece_type(int piece) {  in piece_type()  argument
88    ASSERT(piece_is_ok(piece));  in piece_type()
90    return piece & ~3;  in piece_type()
95 bool piece_is_pawn(int piece) {  in piece_is_pawn()  argument
97    ASSERT(piece_is_ok(piece));  in piece_is_pawn()
99    return (piece & PawnFlags) != 0;  in piece_is_pawn()
104 bool piece_is_knight(int piece) {  in piece_is_knight()  argument
106    ASSERT(piece_is_ok(piece));  in piece_is_knight()
108    return (piece & KnightFlag) != 0;  in piece_is_knight()
113 bool piece_is_bishop(int piece) {  in piece_is_bishop()  argument
115    ASSERT(piece_is_ok(piece));  in piece_is_bishop()
117    return (piece & QueenFlags) == BishopFlag;  in piece_is_bishop()
122 bool piece_is_rook(int piece) {  in piece_is_rook()  argument
124    ASSERT(piece_is_ok(piece));  in piece_is_rook()
126    return (piece & QueenFlags) == RookFlag;  in piece_is_rook()
131 bool piece_is_queen(int piece) {  in piece_is_queen()  argument
133    ASSERT(piece_is_ok(piece));  in piece_is_queen()
135    return (piece & QueenFlags) == QueenFlags;  in piece_is_queen()
140 bool piece_is_king(int piece) {  in piece_is_king()  argument
142    ASSERT(piece_is_ok(piece));  in piece_is_king()
144    return (piece & KingFlag) != 0;  in piece_is_king()
149 bool piece_is_slider(int piece) {  in piece_is_slider()  argument
151    ASSERT(piece_is_ok(piece));  in piece_is_slider()
153    return (piece & QueenFlags) != 0;  in piece_is_slider()
158 int piece_to_12(int piece) {  in piece_to_12()  argument
160    ASSERT(piece_is_ok(piece));  in piece_to_12()
162    return PieceTo12[piece];  in piece_to_12()
167 int piece_from_12(int piece) {  in piece_from_12()  argument
169    ASSERT(piece>=0&&piece<12);  in piece_from_12()
171    return PieceFrom12[piece];  in piece_from_12()
176 int piece_to_char(int piece) {  in piece_to_char()  argument
178    ASSERT(piece_is_ok(piece));  in piece_to_char()
180    return PieceString[piece_to_12(piece)];  in piece_to_char()