GETC(3) | Library Functions Manual | GETC(3) |
fgetc
, getc
,
getchar
, getw
—
get next character or word from input stream
#include
<stdio.h>
int
fgetc
(FILE
*stream);
int
getc
(FILE
*stream);
int
getchar
(void);
int
getw
(FILE
*stream);
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.
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 ANSI X3.159-1989
(“ANSI C89”).
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.
Dennis Ritchie originally implemented
getc
() and getw
() in PDP-11
assembler.
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.
December 1, 2017 | OpenBSD-current |