/*
* This function works like printf, except that it only understands
* very few of the standard formats, to be precise %c, %d, %f, %s.
* But it also accepts %m, which takes two integers and writes a vertex,
* and %C, which takes a color value and writes a color string.
*/
void
gtp_mprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
for (; *fmt ; ++fmt) {
if (*fmt == '%') {
switch (*++fmt) {
case 'c':
{
/* rules of promotion => passed as int, not char */
int c = va_arg(ap, int);
putc(c, stdout);
break;
}
case 'd':
{
int d = va_arg(ap, int);
fprintf(stdout, "%d", d);
break;
}
case 'f':
{
double f = va_arg(ap, double); /* passed as double, not float */
fprintf(stdout, "%f", f);
break;
}
case 's':
{
char *s = va_arg(ap, char*);
fputs(s, stdout);
break;
}
case 'm':
{
int m = va_arg(ap, int);
int n = va_arg(ap, int);
gtp_print_vertex(m, n);
break;
}
case 'C':
{
int color = va_arg(ap, int);
if (color == WHITE)
fputs("white", stdout);
else if (color == BLACK)
fputs("black", stdout);
else
fputs("empty", stdout);
break;
}
default:
fprintf(stdout, "\n\nUnknown format character '%c'\n", *fmt);
break;
}
}
else
putc(*fmt, stdout);
}
/* Function: Generate and play the supposedly best move for either color.
* Arguments: color to move
* Fails: invalid color
* Returns: a move coordinate or "PASS" (or "resign" if resignation_allowed)
*
* Status: GTP version 2 standard command.
*/
static int gtp_genmove(char *s) {
DataGo move;
Player color;
if (!gtp_decode_color(s, &color))
return gtp_failure("invalid color");
move = game->gen_move(color);
if (IS_RESIGN(move))
return gtp_success("resign");
assert(game->play_move(move));
gtp_start_response(GTP_SUCCESS);
if (IS_PASS(move))
gtp_print_vertex(-1, -1);
else
gtp_print_vertex(move.i, move.j);
return gtp_finish_response();
}