move.h

   1 #ifndef ZZGO_MOVE_H
   2 #define ZZGO_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 /* dyn allocated */
  29 static coord_t *coord_init(int x, int y, int size);
  30 static coord_t *coord_copy(coord_t c);
  31 static coord_t *coord_pass(void);
  32 static coord_t *coord_resign(void);
  33 static void coord_done(coord_t *c);
  34
  35 struct board;
  36 char *coord2bstr(char *buf, coord_t c, struct board *board);
  37 /* Return coordinate string in a dynamically allocated buffer. Thread-safe. */
  38 char *coord2str(coord_t c, struct board *b);
  39 /* Return coordinate string in a static buffer; multiple buffers are shuffled
  40  * to enable use for multiple printf() parameters, but it is NOT safe for
  41  * anything but debugging - in particular, it is NOT thread-safe! */
  42 char *coord2sstr(coord_t c, struct board *b);
  43 coord_t *str2coord(char *str, int board_size);
  44
  45
  46 struct move {
  47         coord_t coord;
  48         enum stone color;
  49 };
  50
  51
  52
  53 static inline coord_t *
  54 coord_init(int x, int y, int size)
  55 {
  56         coord_t *c = calloc2(1, sizeof(coord_t));
  57         *c = x + y * size;
  58         return c;
  59 }
  60
  61 static inline coord_t *
  62 coord_copy(coord_t c)
  63 {
  64         coord_t *c2 = calloc2(1, sizeof(coord_t));
  65         memcpy(c2, &c, sizeof(c));
  66         return c2;
  67 }
  68
  69 static inline coord_t *
  70 coord_pass()
  71 {
  72         return coord_copy(pass);
  73 }
  74
  75 static inline coord_t *
  76 coord_resign()
  77 {
  78         return coord_copy(resign);
  79 }
  80
  81 /* No sanity checking */
  82 static inline coord_t
  83 str2scoord(char *str, int size)
  84 {
  85         if (!strcasecmp(str, "pass")) {
  86                 return pass;
  87         } else if (!strcasecmp(str, "resign")) {
  88                 return resign;
  89         } else {
  90                 char xc = tolower(str[0]);
  91                 return xc - 'a' - (xc > 'i') + 1 + atoi(str + 1) * size;
  92         }
  93 }
  94
  95 static inline void
  96 coord_done(coord_t *c)
  97 {
  98         free(c);
  99 }
 100
 101 #endif