al_feof - Allegro 5 API

       Returns  true  if the end-of-file indicator has been set on the file, i.e. we have attempted to read past
       the end of the file.

       This does not return true if we simply are at the end of the file.  The following  code  correctly  reads
       two bytes, even when the file contains exactly two bytes:

              int b1 = al_fgetc(f);
              int b2 = al_fgetc(f);
              if (al_feof(f)) {
                 /* At least one byte was unsuccessfully read. */
                 report_error();
              }

       al_feof - Allegro 5 API

al_ferror(3alleg5), al_fclearerr(3alleg5)

Allegro reference manual                                                                        al_feof(3alleg5)

              #include <allegro5/allegro.h>

              bool al_feof(ALLEGRO_FILE *f)