al_vfprintf(3)             Library Functions Manual             al_vfprintf(3)

NAME
       al_vfprintf - Allegro 5 API

SYNOPSIS
              #include <allegro5/allegro.h>

              int al_vfprintf(ALLEGRO_FILE *pfile, const char *format, va_list args)

DESCRIPTION
       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.

SEE ALSO
       al_fprintf(3)

Allegro reference manual                                        al_vfprintf(3)