Fossil

  const char *zEnd;

  if(nFilename>=0 && nFilename<8/*strlen _FOSSIL_*/) return 0;
  else if(nFilename<0) nFilename = (int)strlen(zFilename);
  if(nFilename<8) return 0;
  zEnd = zFilename + nFilename;
  switch(zEnd[-1]){
    case '_':
    case '_': {
      return fossil_strcmp("_FOSSIL_", &zEnd[-8])
        ? 0 : (8==nFilename ? 1 : ('/'==zEnd[-9] ? 2 : 0));
    }
    case 't':
    case 't': {
      return (nFilename<9
              || '.'!=zEnd[-9]
              || fossil_strcmp(".fslckout", &zEnd[-9]))
        ? 0 : (9==nFilename ? 1 : ('/'==zEnd[-10] ? 2 : 0));
    }
    default:
      return 0;
  }
}

/*
** COMMAND: test-is-ckout-db