textprintf_ex (3) - Linux Man Pages
textprintf_ex: Formatted output of a string. Allegro game programming library.
NAMEtextprintf_ex - Formatted output of a string. Allegro game programming library.
DESCRIPTIONFormatted 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:
int player_score; ... textprintf_ex(screen, font, 10, 10, makecol(255, 100, 200), -1, "Score: %d", player_score);