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/* $Id: gomo1.c,v 1.4 2002/07/21 09:26:02 in2 Exp $ */
#include "bbs.h"
#define QCAST int (*)(const void *, const void *)
/* pattern and advance map */
static int
intrevcmp(const void *a, const void *b)
{
return (*(int *)b - *(int *)a);
}
/* x,y: 0..BRDSIZ-1 ; color: CBLACK,CWHITE ; dx,dy: -1,0,+1 */
static int
gomo_getindex(int x, int y, int color, int dx, int dy)
{
int i, k, n;
for (n = -1, i = 0, k = 1; i < 5; i++, k <<= 1) {
x += dx;
y += dy;
if ((x < 0) || (x >= BRDSIZ) || (y < 0) || (y >= BRDSIZ)) {
n += k;
break;
} else if (ku[x][y] != BBLANK) {
n += k;
if (ku[x][y] != color)
break;
}
}
if (i >= 5)
n += k;
return n;
}
int
chkwin(int style, int limit)
{
if (style == 0x0c)
return 1 /* style */ ;
else if (limit == 0) {
if (style == 0x0b)
return 1 /* style */ ;
return 0;
}
if ((style < 0x0c) && (style > 0x07))
return -1 /* -style */ ;
return 0;
}
/* x,y: 0..BRDSIZ-1 ; color: CBLACK,CWHITE ; limit:1,0 ; dx,dy: 0,1 */
static int
dirchk(int x, int y, int color, int limit, int dx, int dy)
{
int le, ri, loc, style = 0;
le = gomo_getindex(x, y, color, -dx, -dy);
ri = gomo_getindex(x, y, color, dx, dy);
loc = (le > ri) ? (((le * (le + 1)) >> 1) + ri) :
(((ri * (ri + 1)) >> 1) + le);
style = pat[loc];
if (limit == 0)
return (style & 0x0f);
style >>= 4;
if ((style == 3) || (style == 2)) {
int i, n = 0, tmp, nx, ny;
n = adv[loc >> 1];
((loc & 1) == 0) ? (n >>= 4) : (n &= 0x0f);
ku[x][y] = color;
for (i = 0; i < 2; i++) {
if ((tmp = (i == 0) ? (-(n >> 2)) : (n & 3)) != 0) {
nx = x + (le > ri ? 1 : -1) * tmp * dx;
ny = y + (le > ri ? 1 : -1) * tmp * dy;
if ((dirchk(nx, ny, color, 0, dx, dy) == 0x06) &&
(chkwin(getstyle(nx, ny, color, limit), limit) >= 0))
break;
}
}
if (i >= 2)
style = 0;
ku[x][y] = BBLANK;
}
return style;
}
/* 例外=F 錯誤=E 有子=D 連五=C 連六=B 雙四=A 四四=9 三三=8 */
/* 四三=7 活四=6 斷四=5 死四=4 活三=3 斷三=2 保留=1 無效=0 */
/* x,y: 0..BRDSIZ-1 ; color: CBLACK,CWHITE ; limit: 1,0 */
int
getstyle(int x, int y, int color, int limit)
{
int i, j, dir[4], style;
if ((x < 0) || (x >= BRDSIZ) || (y < 0) || (y >= BRDSIZ))
return 0x0f;
if (ku[x][y] != BBLANK)
return 0x0d;
for (i = 0; i < 4; i++)
dir[i] = dirchk(x, y, color, limit, i ? (i >> 1) : -1, i ? (i & 1) : 1);
qsort(dir, 4, sizeof(int), (QCAST)intrevcmp);
if ((style = dir[0]) >= 2) {
for (i = 1, j = 6 + (limit ? 1 : 0); i < 4; i++) {
if ((style > j) || (dir[i] < 2))
break;
if (dir[i] > 3)
style = 9;
else if ((style < 7) && (style > 3))
style = 7;
else
style = 8;
}
}
return style;
}
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