77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)allow.c 1.1 94/10/31 SMI"; /* from UCB 4.1 82/05/11 */
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#endif
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#include "back.h"
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movallow () {
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register int i, m, iold;
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int r;
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if (d0)
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swap;
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m = (D0 == D1? 4: 2);
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = iold = 0;
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while (i < m) {
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if (*offptr == 15)
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break;
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h[i] = 0;
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if (board[bar]) {
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if (i == 1 || m == 4)
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g[i] = bar+cturn*D1;
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else
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g[i] = bar+cturn*D0;
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if (r = makmove(i)) {
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if (d0 || m == 4)
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break;
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swap;
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movback (i);
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if (i > iold)
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iold = i;
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = 0;
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} else
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i++;
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continue;
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}
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if ((p[i] += cturn) == home) {
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if (i > iold)
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iold = i;
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if (m == 2 && i) {
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movback(i);
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p[i--] = bar;
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if (p[i] != bar)
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continue;
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else
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break;
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}
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if (d0 || m == 4)
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break;
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swap;
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movback (i);
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = 0;
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continue;
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}
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if (i == 1 || m == 4)
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g[i] = p[i]+cturn*D1;
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else
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g[i] = p[i]+cturn*D0;
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if (g[i]*cturn > home) {
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if (*offptr >= 0)
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g[i] = home;
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else
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continue;
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}
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if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0)
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i++;
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}
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movback (i);
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return (iold > i? iold: i);
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}
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