FGetC -- read a single character from a file (V6.0)
int c = FGetC(APTR handle);
This function must read a single character from the specified file handle and return it. In case the end-of-file marker has been reached or an error has occurred, -1 must be returned.
This function must be implemented in a thread-safe manner.
file handle returned by
character read or -1 on error or EOF