The
fgetc();
function obtains the next input character (if present) from the stream
pointed at by
stream,
or the next character pushed back on the stream via
ungetc(3).
The
getc();
function acts essentially identically to
fgetc();,
but is a macro that expands in-line.
The
getchar();
function is equivalent to
getc();
with the argument
stdin.
The
getw();
function obtains the next
int
(if present)
from the stream pointed at by
stream.
RETURN VALUES
If successful, these routines return the next requested object from the
stream.
If the stream is at end-of-file or a read error occurs, the routines return
EOF.
The routines
feof(3)
and
ferror(3)
must be used to distinguish between end-of-file and error.
If an error occurs, the global variable
errno
is set to indicate the error.
The end-of-file condition is remembered, even on a terminal, and all
subsequent attempts to read will return
EOF
until the condition is cleared with
clearerr(3).
The
fgetc();,
getc();,
and
getchar();
functions conform to
BUGS
Since
EOF
is a valid integer value,
feof(3)
and
ferror(3)
must be used to check for failure after calling
getw();.
Since the size and byte order of an
int
may vary from one machine to another,
getw();
is not recommended for portable applications.