/* $NetBSD: gomoku.h,v 1.56 2022/06/19 10:23:48 rillig Exp $ */ /* * Copyright (c) 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ralph Campbell. * * 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. * * @(#)gomoku.h 8.2 (Berkeley) 5/3/95 */ #include <sys/types.h> #include <sys/endian.h> #include <stdbool.h> #include <stdio.h> /* * The gomoku 'board' mainly consists of the playing area of BSZ x BSZ spots. * The playing area uses 1-based coordinates. Around the playing area is a * rectangle of border spots, to avoid having to check the coordinates when * calculating spot coordinates. The left and right border overlap, to save a * few bytes. */ #define BSZ 19 #define BAREA ((1 + BSZ + 1) * (BSZ + 1) + 1) /* * A 'frame' is a group of five or six contiguous spots on the board. An * open-ended frame is one with spaces on both ends; otherwise, it is closed. */ #define FAREA (2 * BSZ * (BSZ - 4) + 2 * (BSZ - 4) * (BSZ - 4)) /* The content of a spot on the board; used in s_occ. */ #define BLACK 0 #define WHITE 1 #define EMPTY 2 #define BORDER 3 /* Either BLACK or WHITE. */ typedef unsigned char player_color; /* A spot on the board, or one of the special values below. */ typedef unsigned short spot_index; #define PT(x, y) ((x) + (BSZ + 1) * (y)) /* return values for makemove, readinput */ #define MOVEOK 0 #define RESIGN 1 #define ILLEGAL 2 #define WIN 3 #define TIE 4 #define SAVE 5 #define END_OF_INPUT 6 /* * A 'combo' is a group of intersecting or overlapping frames and consists of * two numbers: * 'F' is the number of moves still needed to make the combo non-blockable. * 'W' is the minimum number of moves needed to win once it can't be blocked. * * A 'force' is a combo that is one move away from being non-blockable. * * Each time a frame is added to the combo, the number of moves to complete * the force is the number of moves needed to 'fill' the frame plus one at * the intersection point. The number of moves to win is the number of moves * to complete the best frame minus the last move to complete the force. * Note that it doesn't make sense to combine a <1,x> with anything since * it is already a force. Also, the frames have to be independent so a * single move doesn't affect more than one frame making up the combo. * * Rules for comparing which of two combos (<F1,W1> <F2,W2>) is better: * Both the same color: * <F',W'> = (F1 < F2 || F1 == F2 && W1 <= W2) ? <F1,W1> : <F2,W2> * We want to complete the force first, then the combo with the * fewest moves to win. * Different colors, <F1,W1> is the combo for the player with the next move: * <F',W'> = F2 <= 1 && (F1 > 1 || F2 + W2 < F1 + W1) ? <F2,W2> : <F1,W1> * We want to block only if we have to (i.e., if they are one move away * from completing a force, and we don't have a force that we can * complete which takes fewer or the same number of moves to win). */ /* * Single frame combo values: * <F,W> board values * 5,0 . . . . . O * 4,1 . . . . . . * 4,0 . . . . X O * 3,1 . . . . X . * 3,0 . . . X X O * 2,1 . . . X X . * 2,0 . . X X X O * 1,1 . . X X X . * 1,0 . X X X X O * 0,1 . X X X X . * 0,0 X X X X X O * * The rule for combining two combos (<F1,W1> <F2,W2>) with V valid * intersection points is: * F' = F1 + F2 - 2 - V * W' = MIN(F1 + W1 - 1, F2 + W2 - 1) */ union comboval { struct { #if BYTE_ORDER == BIG_ENDIAN u_char a; u_char b; #endif #if BYTE_ORDER == LITTLE_ENDIAN u_char b; u_char a; #endif } c; u_short s; }; #define cv_force c.a /* # moves to complete force */ #define cv_win c.b /* # moves to win */ /* * This structure is used to record information about single frames (F) and * combinations of two more frames (C). * For combinations of two or more frames, there is an additional * array of pointers to the frames of the combination which is sorted * by the index into the frames[] array. This is used to prevent duplication * since frame A combined with B is the same as B with A. * struct combostr *c_sort[size c_nframes]; * The leaves of the tree (frames) are numbered 0 (bottom, leftmost) * to c_nframes - 1 (top, right). This is stored in c_frameindex and * c_dir if C_LOOP is set. */ struct combostr { struct combostr *c_next; /* list of combos at the same level */ struct combostr *c_prev; /* list of combos at the same level */ struct combostr *c_link[2]; /* F: NULL, * C: previous level */ union comboval c_linkv[2]; /* C: combo value for link[0, 1] */ union comboval c_combo; /* F: initial combo value (read-only), * C: combo value for this level */ spot_index c_vertex; /* F: frame head, * C: intersection */ u_char c_nframes; /* F: 1, * C: number of frames in the combo */ u_char c_dir; /* F: frame direction, * C: loop frame */ u_char c_flags; /* C: combo flags */ u_char c_frameindex; /* C: intersection frame index */ u_char c_framecnt[2]; /* number of frames left to attach */ u_char c_emask[2]; /* C: bit mask of completion spots for * link[0] and link[1] */ u_char c_voff[2]; /* C: vertex offset within frame */ }; /* flag values for c_flags */ #define C_OPEN_0 0x01 /* link[0] is an open-ended frame */ #define C_OPEN_1 0x02 /* link[1] is an open-ended frame */ #define C_LOOP 0x04 /* link[1] intersects previous frame */ /* * This structure is used for recording the completion points of * multi frame combos. */ struct elist { struct elist *e_next; /* list of completion points */ struct combostr *e_combo; /* the whole combo */ u_char e_off; /* offset in frame of this empty spot */ u_char e_frameindex; /* intersection frame index */ u_char e_framecnt; /* number of frames left to attach */ u_char e_emask; /* real value of the frame's emask */ union comboval e_fval; /* frame combo value */ }; /* The index of a frame in the global 'frames'. */ typedef unsigned short frame_index; /* 0 = right, 1 = down right, 2 = down, 3 = down left. */ typedef unsigned char direction; #define DIR__R 0 /* right */ #define DIR_DR 1 /* down right */ #define DIR_D_ 2 /* down */ #define DIR_DL 3 /* down left */ /* * One spot structure for each location on the board. * A frame consists of the combination for the current spot plus the next * five spots in the direction. */ struct spotstr { short s_occ; /* color of occupant */ short s_wval; /* weighted value */ int s_flags; /* flags for graph walks */ frame_index s_frame[4]; /* level 1 combo for [dir] */ union comboval s_fval[2][4]; /* combo value for [color][dir] */ union comboval s_combo[2]; /* minimum combo value for [color] */ u_char s_level[2]; /* number of frames in the min combo */ u_char s_nforce[2]; /* number of <1,x> combos */ struct elist *s_empty; /* level n combo completion spots */ struct elist *s_nempty; /* level n+1 combo completion spots */ }; /* flag values for s_flags */ #define CFLAG 0x000001 /* frame is part of a combo */ #define CFLAGALL 0x00000F /* all frame directions marked */ #define IFLAG 0x000010 /* legal intersection point */ #define IFLAGALL 0x0000F0 /* any intersection points? */ #define FFLAG 0x000100 /* frame is part of a <1,x> combo */ #define FFLAGALL 0x000F00 /* all force frames */ #define MFLAG 0x001000 /* frame has already been seen */ #define MFLAGALL 0x00F000 /* all frames seen */ #define BFLAG 0x010000 /* frame intersects border or dead */ #define BFLAGALL 0x0F0000 /* all frames dead */ static inline bool is_blocked(const struct spotstr *sp, direction r) { return (sp->s_flags & (BFLAG << r)) != 0; } static inline void set_blocked(struct spotstr *sp, direction r) { sp->s_flags |= BFLAG << r; } struct game { unsigned int nmoves; /* number of played moves */ spot_index moves[BSZ * BSZ]; /* log of all played moves */ spot_index win_spot; /* the winning move, or 0 */ direction win_dir; int user_x; int user_y; }; extern const char letters[]; extern const char pdir[]; extern const int dd[4]; extern struct spotstr board[BAREA]; /* info for board */ extern struct combostr frames[FAREA]; /* storage for single frames */ extern struct combostr *sortframes[2]; /* sorted, non-empty frames */ extern u_char overlap[FAREA * FAREA]; extern spot_index intersect[FAREA * FAREA]; /* frame [a][b] intersection */ extern struct game game; extern int debug; extern bool interactive; extern const char *plyr[]; void init_board(void); spot_index get_coord(void); int get_key(const char *); bool get_line(char *, int, void (*)(const char *)); void ask(const char *); void dislog(const char *); void bdump(FILE *); void bdisp(void); void bdisp_init(void); void cursfini(void); void cursinit(void); void bdwho(void); void panic(const char *, ...) __printflike(1, 2) __dead; void debuglog(const char *, ...) __printflike(1, 2); void whatsup(int); const char *stoc(spot_index); spot_index ctos(const char *); int makemove(player_color, spot_index); void clearcombo(struct combostr *, int); void markcombo(struct combostr *); spot_index pickmove(player_color); #if defined(DEBUG) void printcombo(struct combostr *, char *, size_t); #endif
