al_vfprintf(3) al_vfprintf(3)

al_vfprintf - Allegro 5 API

#include <allegro5/allegro.h>
int al_vfprintf(ALLEGRO_FILE *pfile, const char *format, va_list args)

Like al_fprintf but takes a va_list. Useful for creating your own variations of formatted printing. Returns the number of bytes written, or a negative number on error.

al_fprintf(3)

Allegro reference manual