The C standard library certainly has warts (errno, anyone?) but surely you can't begin to use fgetc() without knowing about EOF… even if you forget that int8_t

The C standard library certainly has warts (errno, anyone?) but surely you can't begin to use fgetc() without knowing about EOF… even if you forget that int8_t is not required to exist (people writing int8_t usually mean int_least8_t).