move.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 #include "board.h"
   7 #include "move.h"
   8
   9
  10 /* The S_OFFBOARD margin is not addressable by coordinates. */
  11
  12 static char asdf[] = "abcdefghjklmnopqrstuvwxyz";
  13
  14 static char *
  15 coord2bstr(char *buf, coord_t c, struct board *board)
  16 {
  17         if (is_pass(c)) {
  18                 return "pass";
  19         } else if (is_resign(c)) {
  20                 return "resign";
  21         } else {
  22                 /* Some GTP servers are broken and won't grok lowercase coords */
  23                 snprintf(buf, 4, "%c%d", toupper(asdf[coord_x(c, board) - 1]), coord_y(c, board));
  24                 return buf;
  25         }
  26 }
  27
  28 /* Return coordinate in dynamically allocated buffer. */
  29 char *
  30 coord2str(coord_t c, struct board *board)
  31 {
  32         char buf[256];
  33         return strdup(coord2bstr(buf, c, board));
  34 }
  35
  36 /* Return coordinate in statically allocated buffer, with some backlog for
  37  * multiple independent invocations. Useful for debugging. */
  38 char *
  39 coord2sstr(coord_t c, struct board *board)
  40 {
  41         static char *b;
  42         static char bl[10][4];
  43         static int bi;
  44         b = bl[bi]; bi = (bi + 1) % 10;
  45         return coord2bstr(b, c, board);
  46 }
  47
  48 /* No sanity checking */
  49 coord_t *
  50 str2coord(char *str, int size)
  51 {
  52         if (!strcasecmp(str, "pass")) {
  53                 return coord_pass();
  54         } else if (!strcasecmp(str, "resign")) {
  55                 return coord_resign();
  56         } else {
  57                 char xc = tolower(str[0]);
  58                 return coord_init(xc - 'a' - (xc > 'i') + 1, atoi(str + 1), size);
  59         }
  60 }