/* $OpenBSD: allow.c,v 1.4 2003/06/03 03:01:38 millert Exp $ */ /* * Copyright (c) 1980, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)allow.c 8.1 (Berkeley) 5/31/93"; #else static char rcsid[] = "$OpenBSD: allow.c,v 1.4 2003/06/03 03:01:38 millert Exp $"; #endif #endif /* not lint */ #include "back.h" int movallow() { int i, m, iold, r; if (d0) swap; m = (D0 == D1 ? 4 : 2); for (i = 0; i < 4; i++) p[i] = bar; i = iold = 0; while (i < m) { if (*offptr == 15) break; h[i] = 0; if (board[bar]) { if (i == 1 || m == 4) g[i] = bar + cturn * D1; else g[i] = bar + cturn * D0; if ((r = makmove(i))) { if (d0 || m == 4) break; swap; movback(i); if (i > iold) iold = i; for (i = 0; i < 4; i++) p[i] = bar; i = 0; } else i++; continue; } if ((p[i] += cturn) == home) { if (i > iold) iold = i; if (m == 2 && i) { movback(i); p[i--] = bar; if (p[i] != bar) continue; else break; } if (d0 || m == 4) break; swap; movback(i); for (i = 0; i < 4; i++) p[i] = bar; i = 0; continue; } if (i == 1 || m == 4) g[i] = p[i] + cturn * D1; else g[i] = p[i] + cturn * D0; if (g[i] * cturn > home) { if (*offptr >= 0) g[i] = home; else continue; } if (board[p[i]] * cturn > 0 && (r = makmove(i)) == 0) i++; } movback(i); return (iold > i ? iold : i); }