gomoku: split initialization of the board into smaller functions
The comments about the "top border" and "bottom border" had been wrong all the time. Mention the corners in the comments, to remove the magic from the various '+ 1' in the code. No functional change.
This commit is contained in:
rillig
parent
9fc7748df3
commit
14facc424c
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@ -1,4 +1,4 @@
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/* $NetBSD: bdinit.c,v 1.24 2022/05/28 08:32:55 rillig Exp $ */
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/* $NetBSD: bdinit.c,v 1.25 2022/05/28 17:51:27 rillig Exp $ */
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/*
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* Copyright (c) 1994
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@ -34,119 +34,129 @@
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#include <sys/cdefs.h>
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/* from: @(#)bdinit.c 8.2 (Berkeley) 5/3/95 */
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__RCSID("$NetBSD: bdinit.c,v 1.24 2022/05/28 08:32:55 rillig Exp $");
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__RCSID("$NetBSD: bdinit.c,v 1.25 2022/05/28 17:51:27 rillig Exp $");
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#include <string.h>
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#include "gomoku.h"
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static void init_overlap(void);
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void
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bdinit(struct spotstr *bp)
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static void
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init_spot_flags_and_fval(struct spotstr *sp, int i, int j)
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{
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sp->s_flags = 0;
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if (j < 5) {
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/* directions 1, 2, 3 are blocked */
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sp->s_flags |= (BFLAG << 1) | (BFLAG << 2) |
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(BFLAG << 3);
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sp->s_fval[BLACK][1].s = 0x600;
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sp->s_fval[BLACK][2].s = 0x600;
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sp->s_fval[BLACK][3].s = 0x600;
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sp->s_fval[WHITE][1].s = 0x600;
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sp->s_fval[WHITE][2].s = 0x600;
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sp->s_fval[WHITE][3].s = 0x600;
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} else if (j == 5) {
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/* five spaces, blocked on one side */
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sp->s_fval[BLACK][1].s = 0x500;
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sp->s_fval[BLACK][2].s = 0x500;
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sp->s_fval[BLACK][3].s = 0x500;
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sp->s_fval[WHITE][1].s = 0x500;
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sp->s_fval[WHITE][2].s = 0x500;
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sp->s_fval[WHITE][3].s = 0x500;
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} else {
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/* six spaces, not blocked */
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sp->s_fval[BLACK][1].s = 0x401;
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sp->s_fval[BLACK][2].s = 0x401;
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sp->s_fval[BLACK][3].s = 0x401;
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sp->s_fval[WHITE][1].s = 0x401;
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sp->s_fval[WHITE][2].s = 0x401;
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sp->s_fval[WHITE][3].s = 0x401;
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}
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if (i > (BSZ - 4)) {
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/* directions 0, 1 are blocked */
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sp->s_flags |= BFLAG | (BFLAG << 1);
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sp->s_fval[BLACK][0].s = 0x600;
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sp->s_fval[BLACK][1].s = 0x600;
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sp->s_fval[WHITE][0].s = 0x600;
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sp->s_fval[WHITE][1].s = 0x600;
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} else if (i == (BSZ - 4)) {
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sp->s_fval[BLACK][0].s = 0x500;
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sp->s_fval[WHITE][0].s = 0x500;
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/* if direction 1 is not blocked */
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if ((sp->s_flags & (BFLAG << 1)) == 0) {
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sp->s_fval[BLACK][1].s = 0x500;
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sp->s_fval[WHITE][1].s = 0x500;
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}
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} else {
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sp->s_fval[BLACK][0].s = 0x401;
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sp->s_fval[WHITE][0].s = 0x401;
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if (i < 5) {
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/* direction 3 is blocked */
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sp->s_flags |= (BFLAG << 3);
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sp->s_fval[BLACK][3].s = 0x600;
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sp->s_fval[WHITE][3].s = 0x600;
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} else if (i == 5 &&
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(sp->s_flags & (BFLAG << 3)) == 0) {
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sp->s_fval[BLACK][3].s = 0x500;
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sp->s_fval[WHITE][3].s = 0x500;
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}
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}
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}
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/* Allocate one of the pre-allocated frames for each non-blocked frame. */
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static void
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init_spot_frame(struct spotstr *sp, struct combostr **cbpp)
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{
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for (int r = 4; --r >= 0; ) {
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if ((sp->s_flags & (BFLAG << r)) != 0)
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continue;
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struct combostr *cbp = (*cbpp)++;
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cbp->c_combo.s = sp->s_fval[BLACK][r].s;
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cbp->c_vertex = (u_short)(sp - board);
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cbp->c_nframes = 1;
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cbp->c_dir = r;
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sp->s_frame[r] = cbp;
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}
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}
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void
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init_board(void)
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{
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struct spotstr *sp;
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struct combostr *cbp;
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game.nmoves = 0;
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game.winning_spot = 0;
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/* mark the borders as such */
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sp = bp;
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struct spotstr *sp = board;
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for (int i = 0; i < 1 + BSZ + 1; i++, sp++) {
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sp->s_occ = BORDER; /* top border */
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sp->s_occ = BORDER; /* bottom border and corners */
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sp->s_flags = BFLAGALL;
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}
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/* fill entire board with EMPTY spots */
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/* fill the playing area of the board with EMPTY spots */
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struct combostr *cbp = frames;
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memset(frames, 0, sizeof(frames));
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cbp = frames;
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for (int j = 0; ++j < BSZ + 1; sp++) { /* for each row */
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for (int i = 0; ++i < BSZ + 1; sp++) { /* for each column */
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for (int row = 1; row <= BSZ; row++, sp++) {
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for (int col = 1; col <= BSZ; col++, sp++) {
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sp->s_occ = EMPTY;
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sp->s_flags = 0;
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sp->s_wval = 0;
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if (j < 5) {
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/* directions 1, 2, 3 are blocked */
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sp->s_flags |= (BFLAG << 1) | (BFLAG << 2) |
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(BFLAG << 3);
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sp->s_fval[BLACK][1].s = 0x600;
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sp->s_fval[BLACK][2].s = 0x600;
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sp->s_fval[BLACK][3].s = 0x600;
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sp->s_fval[WHITE][1].s = 0x600;
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sp->s_fval[WHITE][2].s = 0x600;
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sp->s_fval[WHITE][3].s = 0x600;
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} else if (j == 5) {
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/* five spaces, blocked on one side */
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sp->s_fval[BLACK][1].s = 0x500;
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sp->s_fval[BLACK][2].s = 0x500;
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sp->s_fval[BLACK][3].s = 0x500;
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sp->s_fval[WHITE][1].s = 0x500;
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sp->s_fval[WHITE][2].s = 0x500;
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sp->s_fval[WHITE][3].s = 0x500;
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} else {
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/* six spaces, not blocked */
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sp->s_fval[BLACK][1].s = 0x401;
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sp->s_fval[BLACK][2].s = 0x401;
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sp->s_fval[BLACK][3].s = 0x401;
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sp->s_fval[WHITE][1].s = 0x401;
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sp->s_fval[WHITE][2].s = 0x401;
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sp->s_fval[WHITE][3].s = 0x401;
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}
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if (i > (BSZ - 4)) {
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/* directions 0, 1 are blocked */
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sp->s_flags |= BFLAG | (BFLAG << 1);
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sp->s_fval[BLACK][0].s = 0x600;
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sp->s_fval[BLACK][1].s = 0x600;
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sp->s_fval[WHITE][0].s = 0x600;
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sp->s_fval[WHITE][1].s = 0x600;
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} else if (i == (BSZ - 4)) {
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sp->s_fval[BLACK][0].s = 0x500;
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sp->s_fval[WHITE][0].s = 0x500;
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/* if direction 1 is not blocked */
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if ((sp->s_flags & (BFLAG << 1)) == 0) {
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sp->s_fval[BLACK][1].s = 0x500;
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sp->s_fval[WHITE][1].s = 0x500;
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}
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} else {
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sp->s_fval[BLACK][0].s = 0x401;
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sp->s_fval[WHITE][0].s = 0x401;
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if (i < 5) {
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/* direction 3 is blocked */
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sp->s_flags |= (BFLAG << 3);
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sp->s_fval[BLACK][3].s = 0x600;
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sp->s_fval[WHITE][3].s = 0x600;
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} else if (i == 5 &&
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(sp->s_flags & (BFLAG << 3)) == 0) {
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sp->s_fval[BLACK][3].s = 0x500;
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sp->s_fval[WHITE][3].s = 0x500;
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}
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}
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/*
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* Allocate a frame structure for non-blocked frames.
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*/
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for (int r = 4; --r >= 0; ) {
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if ((sp->s_flags & (BFLAG << r)) != 0)
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continue;
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cbp->c_combo.s = sp->s_fval[BLACK][r].s;
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cbp->c_vertex = (u_short)(sp - board);
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cbp->c_nframes = 1;
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cbp->c_dir = r;
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sp->s_frame[r] = cbp;
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cbp++;
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}
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init_spot_flags_and_fval(sp, col, row);
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init_spot_frame(sp, &cbp);
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}
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sp->s_occ = BORDER; /* left & right border */
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sp->s_occ = BORDER; /* combined left and right border */
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sp->s_flags = BFLAGALL;
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}
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/* mark the borders as such */
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for (int i = 0; i < BSZ + 1; i++, sp++) {
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sp->s_occ = BORDER; /* bottom border */
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sp->s_occ = BORDER; /* top border and top-right corner */
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sp->s_flags = BFLAGALL;
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}
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sortframes[BLACK] = NULL;
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sortframes[WHITE] = NULL;
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init_overlap();
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: gomoku.h,v 1.44 2022/05/28 08:32:55 rillig Exp $ */
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/* $NetBSD: gomoku.h,v 1.45 2022/05/28 17:51:27 rillig Exp $ */
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/*
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* Copyright (c) 1994
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@ -237,7 +237,7 @@ extern int debug;
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extern bool interactive;
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extern const char *plyr[];
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void bdinit(struct spotstr *);
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void init_board(void);
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int get_coord(void);
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int get_key(const char *);
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bool get_line(char *, int, void (*)(const char *));
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@ -1,4 +1,4 @@
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/* $NetBSD: main.c,v 1.61 2022/05/28 08:19:18 rillig Exp $ */
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/* $NetBSD: main.c,v 1.62 2022/05/28 17:51:27 rillig Exp $ */
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/*
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* Copyright (c) 1994
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@ -36,7 +36,7 @@
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__COPYRIGHT("@(#) Copyright (c) 1994\
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The Regents of the University of California. All rights reserved.");
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/* @(#)main.c 8.4 (Berkeley) 5/4/95 */
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__RCSID("$NetBSD: main.c,v 1.61 2022/05/28 08:19:18 rillig Exp $");
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__RCSID("$NetBSD: main.c,v 1.62 2022/05/28 17:51:27 rillig Exp $");
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#include <sys/stat.h>
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#include <curses.h>
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@ -349,7 +349,7 @@ main(int argc, char **argv)
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if (interactive)
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cursinit(); /* initialize curses */
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again:
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bdinit(board); /* initialize board contents */
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init_board(); /* initialize board contents */
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if (interactive) {
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bdisp_init(); /* initialize display of board */
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