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/* $Id: chc_rule.c,v 1.4 2002/07/21 09:26:02 in2 Exp $ */
#include "bbs.h"
#define CENTER(a, b) (((a) + (b)) >> 1)
void
chc_init_board(board_t board)
{
memset(board, 0, sizeof(board_t));
board[0][4] = CHE(1, chc_my ^ 1); /* 將 */
board[0][3] = board[0][5] = CHE(2, chc_my ^ 1); /* 士 */
board[0][2] = board[0][6] = CHE(3, chc_my ^ 1); /* 象 */
board[0][0] = board[0][8] = CHE(4, chc_my ^ 1); /* 車 */
board[0][1] = board[0][7] = CHE(5, chc_my ^ 1); /* 馬 */
board[2][1] = board[2][7] = CHE(6, chc_my ^ 1); /* 包 */
board[3][0] = board[3][2] = board[3][4] =
board[3][6] = board[3][8] = CHE(7, chc_my ^ 1); /* 卒 */
board[9][4] = CHE(1, chc_my); /* 帥 */
board[9][3] = board[9][5] = CHE(2, chc_my); /* 仕 */
board[9][2] = board[9][6] = CHE(3, chc_my); /* 相 */
board[9][0] = board[9][8] = CHE(4, chc_my); /* 車 */
board[9][1] = board[9][7] = CHE(5, chc_my); /* 傌 */
board[7][1] = board[7][7] = CHE(6, chc_my); /* 炮 */
board[6][0] = board[6][2] = board[6][4] =
board[6][6] = board[6][8] = CHE(7, chc_my); /* 兵 */
}
void
chc_movechess(board_t board)
{
board[chc_to.r][chc_to.c] = board[chc_from.r][chc_from.c];
board[chc_from.r][chc_from.c] = 0;
}
static int
dist(rc_t from, rc_t to, int rowcol)
{
int d;
d = rowcol ? from.c - to.c : from.r - to.r;
return d > 0 ? d : -d;
}
static int
between(board_t board, rc_t from, rc_t to, int rowcol)
{
int i, rtv = 0;
if (rowcol) {
if (from.c > to.c)
i = from.c, from.c = to.c, to.c = i;
for (i = from.c + 1; i < to.c; i++)
if (board[to.r][i])
rtv++;
} else {
if (from.r > to.r)
i = from.r, from.r = to.r, to.r = i;
for (i = from.r + 1; i < to.r; i++)
if (board[i][to.c])
rtv++;
}
return rtv;
}
int
chc_canmove(board_t board, rc_t from, rc_t to)
{
int i;
int rd, cd, turn;
rd = dist(from, to, 0);
cd = dist(from, to, 1);
turn = CHE_O(board[from.r][from.c]);
/* general check */
if (board[to.r][to.c] && CHE_O(board[to.r][to.c]) == turn)
return 0;
/* individual check */
switch (CHE_P(board[from.r][from.c])) {
case 1: /* 將 帥 */
if (!(rd == 1 && cd == 0) &&
!(rd == 0 && cd == 1))
return 0;
if ((turn == (chc_my ^ 1) && to.r > 2) ||
(turn == chc_my && to.r < 7) ||
to.c < 3 || to.c > 5)
return 0;
break;
case 2: /* 士 仕 */
if (!(rd == 1 && cd == 1))
return 0;
if ((turn == (chc_my ^ 1) && to.r > 2) ||
(turn == chc_my && to.r < 7) ||
to.c < 3 || to.c > 5)
return 0;
break;
case 3: /* 象 相 */
if (!(rd == 2 && cd == 2))
return 0;
if ((turn == (chc_my ^ 1) && to.r > 4) ||
(turn == chc_my && to.r < 5))
return 0;
/* 拐象腿 */
if (board[CENTER(from.r, to.r)][CENTER(from.c, to.c)])
return 0;
break;
case 4: /* 車 */
if (!(rd > 0 && cd == 0) &&
!(rd == 0 && cd > 0))
return 0;
if (between(board, from, to, rd == 0))
return 0;
break;
case 5: /* 馬 傌 */
if (!(rd == 2 && cd == 1) &&
!(rd == 1 && cd == 2))
return 0;
/* 拐馬腳 */
if (rd == 2) {
if (board[CENTER(from.r, to.r)][from.c])
return 0;
} else {
if (board[from.r][CENTER(from.c, to.c)])
return 0;
}
break;
case 6: /* 包 炮 */
if (!(rd > 0 && cd == 0) &&
!(rd == 0 && cd > 0))
return 0;
i = between(board, from, to, rd == 0);
if ((i > 1) ||
(i == 1 && !board[to.r][to.c]) ||
(i == 0 && board[to.r][to.c]))
return 0;
break;
case 7: /* 卒 兵 */
if (!(rd == 1 && cd == 0) &&
!(rd == 0 && cd == 1))
return 0;
if (((turn == (chc_my ^ 1) && to.r < 5) ||
(turn == chc_my && to.r > 4)) &&
cd != 0)
return 0;
if ((turn == (chc_my ^ 1) && to.r < from.r) ||
(turn == chc_my && to.r > from.r))
return 0;
break;
}
return 1;
}
static void
findking(board_t board, int turn, rc_t * buf)
{
int i, r, c;
r = (turn == (chc_my ^ 1)) ? 0 : 7;
for (i = 0; i < 3; r++, i++)
for (c = 3; c < 6; c++)
if (CHE_P(board[r][c]) == 1 &&
CHE_O(board[r][c]) == turn) {
buf->r = r, buf->c = c;
return;
}
}
int
chc_iskfk(board_t board)
{
rc_t from, to;
findking(board, 0, &to);
findking(board, 1, &from);
if (from.c == to.c && between(board, from, to, 0) == 0)
return 1;
return 0;
}
int
chc_ischeck(board_t board, int turn)
{
rc_t from, to;
findking(board, turn, &to);
for (from.r = 0; from.r < BRD_ROW; from.r++)
for (from.c = 0; from.c < BRD_COL; from.c++)
if (board[from.r][from.c] &&
CHE_O(board[from.r][from.c]) != turn)
if (chc_canmove(board, from, to))
return 1;
return 0;
}
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