Formatted output of a string.
Formatted text output, using a printf() style format string. Due to an
internal limitation, this function can't be used for extremely long texts.
If you happen to reach this limit, you can work around it by using
uszprintf() and textout_ex(), which don't have any. Example:
textprintf_ex(screen, font, 10, 10, makecol(255, 100, 200),
-1, "Score: %d", player_score);