static char*
print_san_move_from(const struct position *pos, move m,
char *str, enum player turn)
{
move moves[MOVE_ARRAY_LENGTH];
uint64_t ambig_pieces = UINT64_C(0);
enum piece p = pos_piece_at(pos, mfrom(m));
(void) gen_moves(pos, moves);
for (move *im = moves; *im != 0; ++im) {
if ((mfrom(*im) != mfrom(m)) && (mto(*im) == mto(m))
&& (pos_piece_at(pos, mfrom(*im)) == p))
ambig_pieces |= mfrom64(*im);
}
if ((p == pawn) && is_capture(m)) {
*(str++) = index_to_file_ch(mfrom(m));
}
else if (is_nonempty(ambig_pieces)) {
if (is_nonempty(ambig_pieces & file64(mfrom(m)))) {
if (is_nonempty(ambig_pieces & rank64(mfrom(m)))) {
*(str++) = index_to_file_ch(mfrom(m));
}
*(str++) = index_to_rank_ch(mfrom(m), turn);
}
else {
*(str++) = index_to_file_ch(mfrom(m));
}
}
return str;
}
static void
test_chars(void)
{
assert(char_to_file('a') == file_a);
assert(char_to_file('b') == file_b);
assert(char_to_file('h') == file_h);
assert(char_to_file('A') == file_a);
assert(char_to_file('B') == file_b);
assert(char_to_file('H') == file_h);
assert(char_to_rank('1', white) == rank_1);
assert(char_to_rank('2', white) == rank_2);
assert(char_to_rank('3', white) == rank_3);
assert(char_to_rank('4', white) == rank_4);
assert(char_to_rank('5', white) == rank_5);
assert(char_to_rank('8', white) == rank_8);
assert(char_to_rank('1', black) == rank_8);
assert(char_to_rank('2', black) == rank_7);
assert(char_to_rank('3', black) == rank_6);
assert(char_to_rank('4', black) == rank_5);
assert(char_to_rank('5', black) == rank_4);
assert(char_to_rank('8', black) == rank_1);
assert(index_to_file_ch(0) == 'h');
assert(index_to_file_ch(1) == 'g');
assert(index_to_file_ch(7) == 'a');
assert(index_to_file_ch(63) == 'a');
assert(index_to_rank_ch(0, white) == '8');
assert(index_to_rank_ch(1, white) == '8');
assert(index_to_rank_ch(8 + 7, white) == '7');
assert(index_to_rank_ch(63, white) == '1');
assert(index_to_rank_ch(0, black) == '1');
assert(index_to_rank_ch(1, black) == '1');
assert(index_to_rank_ch(8 + 7, black) == '2');
assert(index_to_rank_ch(63, black) == '8');
assert(piece_to_char(queen) == 'q');
assert(square_to_char(queen, white) == 'Q');
assert(square_to_char(queen, black) == 'q');
assert(is_file('f'));
assert(is_file('F'));
assert(!is_file('4'));
assert(!is_file('i'));
assert(!is_file(' '));
assert(is_rank('1'));
assert(is_rank('6'));
assert(!is_rank('9'));
assert(!is_rank('0'));
assert(!is_rank('a'));
assert(!is_rank(' '));
}
