Re: [Bug-gnubg] File format sgf

[Øystein Johansen]

address@hidden wrote:

> Hi folks,
>
> just back from a snowy holiday in denmark. There I had time to check a
> few computer go (the japanese game) programs. Go is using the same
> ending *.sgf for saving games. Maybe we should think about differnet
> endings?
Nice to see you back again!

The Smart Game Format (SGF), is designed to store game records of board 
games (turn based) for two players. It is therefore the same file format 
and a good parser algorithm should be able to handle the different games 
in the file format.
Check the definitions here: http://www.red-bean.com/sgf/

One problem that will arise is that you can't assign the file extension 
.sgf to a backgammon program, since it might as well be a Go file. This 
can be solved by writing a sgf launcher program, and then assign the sgf 
extension to this launcher program. Hey! I've just made one in twenty 
minutes. It's not tested much and some lines must be added by the end 
user. I basically reads the sgf file and checks if it's a Backgammon of 
Go file, then it searches for the SGF_BACKGAMMON_PROGRAM environment 
variable (or SGF_GO_PROGRAM), and launches the program with the file as 
an agument.

-Øystein



#include <stdio.h>
#include <stdlib.h>

int
main (int argc, char *argv[])
{

  int nGameType;
  char *szExe, szCommand[256];
  FILE *pf;

  if (argc != 2)
    return 0;                   /* Fail silently */

  if (!(pf = fopen (argv[1], "r")))
    {
      fprintf (stderr, "Can't open file %s\n", argv[1]);
      return -1;
    }

  if ((fscanf (pf, "(;FF[4]GM[%d]", &nGameType)) != 1)
    {
      fprintf (stderr, "Can't find SGF identifier in file %s\n", argv[1]);
      fclose (pf);
      return -1;
    }

  switch (nGameType)
    {
    case 1:
      /* GO */
      szExe = getenv ("SGF_GO_PROGRAM");
      if (!szExe)
        {
          fprintf (stderr, "SGF Program for Go, not specified\n");
          return -1;
        }

      /* Now do whatever it takes to open the file with the Go program */
      
      return 0;
      break;
    case 6:
      /* Backgammon */
      szExe = getenv ("SGF_BACKGAMMON_PROGRAM");
      if (!szExe)
        {
          fprintf (stderr, "SGF Program for Backgammon not specified\n");
          return -1;
        }
      
      /* Now do whatever it takes to open the file with the Go program */

//        chdir (dirname (szExe));
//        sprintf (szCommand, "%s %s", filename (szExe), argv[1]);
//        system(szCommand);
    default:
      return 0;
    }
}