libc.info: getc

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`getc'--read a character (macro)

*Synopsis*
     #include <stdio.h>
     int getc(FILE *FP);
   *Description*
`getc' is a macro, defined in `stdio.h'.  You can use `getc' to get the
next single character from the file or stream identified by FP.  As a
side effect, `getc' advances the file's current position indicator.
   For a subroutine version of this macro, see `fgetc'.
*Returns*
The next character (read as an `unsigned char', and cast to `int'),
unless there is no more data, or the host system reports a read error;
in either of these situations, `getc' returns `EOF'.
   You can distinguish the two situations that cause an `EOF' result by
using the `ferror' and `feof' functions.
*Portability*
ANSI C requires `getc'; it suggests, but does not require, that `getc'
be implemented as a macro.  The standard explicitly permits macro
implementations of `getc' to use the argument more than once;
therefore, in a portable program, you should not use an expression with
side effects as the `getc' argument.
   Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.