NAME
fgetc, getc,
getchar, getw —
get next character or word from input
stream
SYNOPSIS
#include
<stdio.h>
int
fgetc(FILE
*stream);
int
getc(FILE
*stream);
int
getchar(void);
int
getw(FILE
*stream);
DESCRIPTION
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).
SEE ALSO
STANDARDS
The fgetc(),
getc(), and getchar()
functions conform to ANSI X3.159-1989
(“ANSI C89”).
HISTORY
The getc() and
getw() functions first appeared in
Version 1 AT&T UNIX;
getchar() in Version 2
AT&T UNIX; and fgetc() in
Version 7 AT&T UNIX.
AUTHORS
Dennis Ritchie originally implemented
getc() and getw() in PDP-11
assembler.
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.