/* generate pawn captures and promotions */
void genattacksp(int f, int r, int c)
{
int forward = dir(c);
square loc = SQ(f,r);
r += forward;
if (f<7)
{
chesspiece p = getpiece(f+1, r);
if (p&&chesspiececolor(p)!=c)
pushmove(MV(loc, SQ(f+1, r)));
}
if (f>0)
{
chesspiece p = getpiece(f-1,r);
if (p&&chesspiececolor(p)!=c)
pushmove(MV(loc, SQ(f-1, r)));
}
if (c==WHITE)
{
if ((r==6)&&emptyp(f,r))
pushmove(MV(loc, SQ(f,r)));
}
else
{
if ((r==1)&&emptyp(f,r))
pushmove(MV(loc, SQ(f,r)));
}
/* get en passante */
if (doublepushp())
{
square start;
square end;
move m;
m = lastmove();
start = FR(m);
end = TO(m);
r -= forward; /* restore to original r */
if (R(end) == r)
{
if (((f+1) == F(start))||
((f-1) == F(start)))
pushmove(MV(loc, SQ(F(start),forward+r)));
}
}
}
void getmovesp(int f, int r, int c)
{
int forward = dir(c);
square loc = SQ(f,r);
r += forward;
// captures
if ((f<7) && (oppenentp (f+1, r, c)))
{
push_pawn_move(loc, SQ(1+f, r));
}
if ((f>0) && (oppenentp (f-1, r, c)))
{
push_pawn_move(loc, SQ(f-1, r));
}
if (emptyp(f,r))
{
int startrank = ((c == WHITE) ? 2 : 5);
push_pawn_move(loc, SQ(f,r));
/* can go two on first move */
if ((r == startrank)&&(emptyp(f,r+forward)))
pushmove(MV(loc, SQ(f,r+forward)));
}
// if last move was double push we can possibly do an en passante
if (doublepushp())
{
square start;
square end;
move m;
m = lastmove();
start = FR(m);
end = TO(m);
r -= forward; /* restore to original r */
if (R(end) == r)
{
if (((f+1) == F(start))||
((f-1) == F(start)))
pushmove(MV(loc, SQ(F(start),forward+r)));
}
}
}
char *formatflags()
{
static char fmt[20];
fmt[0] = flag_test(wqcastlep(), 'Q');
fmt[1] = flag_test(wkcastlep(), 'K');
fmt[2] = flag_test(bqcastlep(), 'q');
fmt[3] = flag_test(bkcastlep(), 'k');
fmt[4] = flag_test(castledp(), 'C');
fmt[5] = flag_test(enpassantedp(), 'E');
fmt[6] = flag_test(doublepushp(), 'P');
fmt[7] = flag_test(wkcastledp(), 'K');
fmt[8] = flag_test(wqcastledp(), 'Q');
fmt[9] = flag_test(bkcastledp(), 'k');
fmt[10] = flag_test(bqcastledp(), 'q');
fmt[11] = tomove() == WHITE ? 'W' : 'B';
fmt[12] = 0;
return fmt;
}
