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/*
* src/play.c, part of Pente (game program)
* Copyright (C) 1994 William Shubert.
* See "configure.h.in" for more copyright information.
*
* Functions used to play a game. No concern for I/O is provided.
*/
#include "pente.h"
void pl_init(pl_t *game) {
bd_init(&game->board);
game->move = 0;
game->maxmove = 0;
}
/* Returns TRUE if it is a valid move, FALSE otherwise. */
bool pl_movep(pl_t *game, bd_loc_t loc) {
uint turn = pl_turn(game), player = pl_player(game);
if ((turn == 0) && (player == 0))
return(loc == bd_xy_loc(9, 9));
if ((loc > BD_GRIDSIZE) || !BD_EMPTYP(game->board.grid[loc]))
return(FALSE);
if ((turn == 1) && (player == 0)) {
int x, y;
x = bd_loc_x(loc);
y = bd_loc_y(loc);
if ((x >= 9-2) && (x <= 9+2) && (y >= 9-2) && (y <= 9+2))
return(FALSE);
}
return(TRUE);
}
/*
* Returns TRUE if the move caused a win.
*/
bool pl_move(pl_t *game, bd_loc_t loc) {
bd_t *board = &(game->board);
uint player = pl_player(game);
uint captures = game->board.captures[player];
uint dir;
int dvec;
bool win = FALSE;
game->movelist[game->move++] = loc;
game->maxmove = game->move;
board->grid[loc] = BD_PLAYER(player);
for (dir = 0; dir < 8; ++dir) {
dvec = bd_dvec[dir];
if (BD_PLAYERP(board->grid[loc+dvec]) &&
(board->grid[loc+dvec] != BD_PLAYER(player)) &&
(board->grid[loc+dvec] == board->grid[loc+dvec+dvec]) &&
(board->grid[loc+dvec+dvec+dvec] == BD_PLAYER(player))) {
++captures;
board->grid[loc+dvec] = BD_EMPTYA;
board->grid[loc+dvec+dvec] = BD_EMPTYA;
}
}
board->captures[player] = captures;
if (captures >= 5)
win = TRUE;
for (dir = 0; dir < 4; ++dir) {
int run_length = 1;
bd_loc_t curloc;
dvec = bd_dvec[dir];
curloc = loc+dvec;
while (board->grid[curloc] == BD_PLAYER(player)) {
curloc += dvec;
++run_length;
}
curloc = loc-dvec;
while (board->grid[curloc] == BD_PLAYER(player)) {
curloc -= dvec;
++run_length;
}
if (run_length >= 5) {
win = TRUE;
board->grid[loc] = BD_WINNER(player);
curloc = loc+dvec;
while (board->grid[curloc] == BD_PLAYER(player)) {
board->grid[curloc] = BD_WINNER(player);
curloc += dvec;
}
curloc = loc-dvec;
while (board->grid[curloc] == BD_PLAYER(player)) {
board->grid[curloc] = BD_WINNER(player);
curloc -= dvec;
}
}
}
return(board->gameover = win);
}
void pl_undo(pl_t *game) {
uint turn, newturns, maxturns;
if (game->move == 0) {
fprintf(stderr, "pente: Internal error detected. move=0, undo.\n");
exit(1);
}
maxturns = game->maxmove;
newturns = game->move - 1;
pl_init(game);
for (turn = 0; turn < newturns; ++turn)
pl_move(game, game->movelist[turn]);
game->maxmove = maxturns;
}
bool pl_redo(pl_t *game) {
uint turn, newturns, maxturns;
bool game_over = FALSE;
if (game->move == game->maxmove) {
fprintf(stderr,
"pente: Internal error detected. move=maxmove=%d, redo.\n",
game->move);
exit(1);
}
maxturns = game->maxmove;
newturns = game->move + 1;
pl_init(game);
for (turn = 0; turn < newturns; ++turn)
game_over = pl_move(game, game->movelist[turn]);
game->maxmove = maxturns;
return(game_over);
}
uint pl_turn(pl_t *game) {
return(game->move >> 1);
}
uint pl_player(pl_t *game) {
return(game->move & 1);
}
bd_t *pl_board(pl_t *game) {
return(&(game->board));
}
uint pl_nmoves(pl_t *game) {
return(game->move);
}
uint pl_maxmoves(pl_t *game) {
return(game->maxmove);
}
bd_loc_t pl_getmove(pl_t *game, uint movenum) {
return(game->movelist[movenum]);
}
void pl_game_str(pl_t *game, char *str) {
int i;
for (i = 0; i < pl_nmoves(game); ++i) {
str = bd_loc_str(pl_getmove(game, i), str);
*(str++) = ',';
}
if (i)
*(str-1) = '\0';
else
*str = '\0';
}
void pl_str_game(const char *str, pl_t *game) {
while (*str != '\0') {
pl_move(game, bd_str_loc(str, &str));
if (*str == ',')
++str;
}
}
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