al_vfprintf - Man Page

#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)

al_fprintf(3).