move.h

   1 #ifndef PACHI_MOVE_H
   2 #define PACHI_MOVE_H
   3
   4 #include <ctype.h>
   5 #include <stdint.h>
   6 #include <string.h>
   7
   8 #include "util.h"
   9 #include "stone.h"
  10
  11 typedef int coord_t;
  12
  13 #define coord_xy(board, x, y) ((x) + (y) * board_size(board))
  14 #define coord_x(c, b) ((b)->coord[c][0])
  15 #define coord_y(c, b) ((b)->coord[c][1])
  16 /* TODO: Smarter way to do this? */
  17 #define coord_dx(c1, c2, b) (coord_x(c1, b) - coord_x(c2, b))
  18 #define coord_dy(c1, c2, b) (coord_y(c1, b) - coord_y(c2, b))
  19
  20 static coord_t pass = -1;
  21 static coord_t resign = -2;
  22 #define is_pass(c) (c == pass)
  23 #define is_resign(c) (c == resign)
  24
  25 #define coord_is_adjecent(c1, c2, b) (abs(c1 - c2) == 1 || abs(c1 - c2) == board_size(b))
  26 #define coord_is_8adjecent(c1, c2, b) (abs(c1 - c2) == 1 || abs(abs(c1 - c2) - board_size(b)) < 2)
  27
  28 /* Quadrants:
  29  * 0 1
  30  * 2 3 (vertically reversed from board_print output, of course!)
  31  * Middle coordinates are included in lower-valued quadrants. */
  32 #define coord_quadrant(c, b) ((coord_x(c, b) > board_size(b) / 2) + 2 * (coord_y(c, b) > board_size(b) / 2))
  33
  34 /* dyn allocated */
  35 static coord_t *coord_init(int x, int y, int size);
  36 static coord_t *coord_copy(coord_t c);
  37 static coord_t *coord_pass(void);
  38 static coord_t *coord_resign(void);
  39 static void coord_done(coord_t *c);
  40
  41 struct board;
  42 char *coord2bstr(char *buf, coord_t c, struct board *board);
  43 /* Return coordinate string in a dynamically allocated buffer. Thread-safe. */
  44 char *coord2str(coord_t c, struct board *b);
  45 /* Return coordinate string in a static buffer; multiple buffers are shuffled
  46  * to enable use for multiple printf() parameters, but it is NOT safe for
  47  * anything but debugging - in particular, it is NOT thread-safe! */
  48 char *coord2sstr(coord_t c, struct board *b);
  49 coord_t *str2coord(char *str, int board_size);
  50
  51
  52 struct move {
  53         coord_t coord;
  54         enum stone color;
  55 };
  56
  57
  58
  59 static inline coord_t *
  60 coord_init(int x, int y, int size)
  61 {
  62         coord_t *c = calloc2(1, sizeof(coord_t));
  63         *c = x + y * size;
  64         return c;
  65 }
  66
  67 static inline coord_t *
  68 coord_copy(coord_t c)
  69 {
  70         coord_t *c2 = calloc2(1, sizeof(coord_t));
  71         memcpy(c2, &c, sizeof(c));
  72         return c2;
  73 }
  74
  75 static inline coord_t *
  76 coord_pass()
  77 {
  78         return coord_copy(pass);
  79 }
  80
  81 static inline coord_t *
  82 coord_resign()
  83 {
  84         return coord_copy(resign);
  85 }
  86
  87 /* No sanity checking */
  88 static inline coord_t
  89 str2scoord(char *str, int size)
  90 {
  91         if (!strcasecmp(str, "pass")) {
  92                 return pass;
  93         } else if (!strcasecmp(str, "resign")) {
  94                 return resign;
  95         } else {
  96                 char xc = tolower(str[0]);
  97                 return xc - 'a' - (xc > 'i') + 1 + atoi(str + 1) * size;
  98         }
  99 }
 100
 101 static inline void
 102 coord_done(coord_t *c)
 103 {
 104         free(c);
 105 }
 106
 107 #endif