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/*
* src/board.c, part of Pente (game program)
* Copyright (C) 1994 William Shubert.
* See "configure.h.in" for more copyright information.
*
* Defines the board data type and related data types.
* Types:
* bd_t - The board itself.
* bd_loc_t - The location; used as an index into the board. Useful values
* range from BD_LOC_MIN to BD_LOC_MAX. Valid values are from
* 0 to BD_GRIDSIZE.
* x,y - The x and y coordinates of a space on the board. Range from
* 0 through 18. If you want to access board locations through
* integers, here's how to do it.
*/
#include "pente.h"
/*
* Direction vectors for the 8 directions.
* That is, to move in direction 3, add bd_dvec[3] to loc.
* Opposite directions are space 4 directions apart.
* That is, bd_dvec[n] = -bd_dvec[n+4].
*
* lvec[] in xio/xdraw.c is based on this array. Be sure to change both or
* neither.
*/
const int bd_dvec[8] = {-22-1, -22, -22+1, -1,
22+1, 22, 22-1, 1};
int bd_loc_x(bd_loc_t loc) {
return((loc-BD_LOC_MIN)%22);
}
int bd_loc_y(bd_loc_t loc) {
return((loc-BD_LOC_MIN)/22);
}
bd_loc_t bd_xy_loc(int x, int y) {
return(x + y*22 + BD_LOC_MIN);
}
void bd_init(bd_t *board) {
uint player;
int x, y;
bd_loc_t loc;
for (player = 0; player < BD_MAXPLAYERS; ++player)
board->captures[player] = 0;
for (loc = 0; loc < BD_GRIDSIZE; ++loc)
board->grid[loc] = BD_EDGE;
for (x = 0; x < 19; ++x) {
for (y = 0; y < 19; ++y)
board->grid[bd_xy_loc(x, y)] = BD_EMPTYB;
}
board->gameover = FALSE;
}
bd_loc_t bd_str_loc(const char *str, const char **strout) {
int x, y;
if (isdigit(str[0])) {
y = str[0] - '0';
++str;
if (isdigit(str[0])) {
y = (y * 10) + str[0] - '0';
++str;
}
x = tolower(*(str++)) - 'a';
} else {
x = tolower(*(str++)) - 'a';
y = str[0] - '0';
++str;
if (isdigit(str[0])) {
y = (y * 10) + str[0] - '0';
++str;
}
}
--y;
if ((x == 'i' - 'a') || ((uint)x > 19) || ((uint) y > 18)) {
return(BD_LOC_MAX);
}
if (x > 'i' - 'a')
--x;
if (strout != NULL)
*strout = str;
return(bd_xy_loc(x, y));
}
char *bd_loc_str(bd_loc_t loc, char *str) {
char cout[] = "abcdefghjklmnopqrst";
sprintf(str, "%c%d", cout[bd_loc_x(loc)], bd_loc_y(loc) + 1);
while (*(++str));
return(str);
}
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