mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-11-17 12:08:43 +00:00
91 lines
3.3 KiB
Groff
91 lines
3.3 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" Chris Torek and the American National Standards Committee X3,
|
|
.\" on Information Processing Systems.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)ungetc.3 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.TH UNGETC 3 "15 September 1997" GNO "Library Routines"
|
|
.SH NAME
|
|
.BR ungetc
|
|
\- un-get character from input stream
|
|
.SH SYNOPSIS
|
|
#include <stdio.h>
|
|
.sp 1
|
|
int \fBungetc\fR (int \fIc\fR, FILE *\fIstream\fR);
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR ungetc
|
|
function pushes the character
|
|
.I c
|
|
(converted to an unsigned char)
|
|
back onto the input stream pointed to by
|
|
.IR stream .
|
|
The pushed-backed characters will be returned by subsequent reads on the
|
|
stream (in reverse order).
|
|
A successful intervening call, using the same stream, to one of the file
|
|
positioning functions
|
|
.BR fseek (3),
|
|
.BR fsetpos (3),
|
|
or
|
|
.BR rewind (3)
|
|
will discard the pushed back characters.
|
|
.LP
|
|
One character of push-back is guaranteed,
|
|
but as long as there is
|
|
sufficient memory, an effectively infinite amount of pushback is allowed.
|
|
.LP
|
|
If a character is successfully pushed-back,
|
|
the end-of-file indicator for the stream is cleared.
|
|
.SH RETURN VALUES
|
|
The
|
|
.BR ungetc
|
|
function
|
|
returns
|
|
the character pushed-back after the conversion, or
|
|
.BR EOF
|
|
if the operation fails.
|
|
If the value of the argument
|
|
.I c
|
|
character equals
|
|
.BR EOF ,
|
|
the operation will fail and the stream will remain unchanged.
|
|
.SH SEE ALSO
|
|
.BR getc (3),
|
|
.BR fseek (3),
|
|
.BR setvbuf (3)
|
|
.SH STANDARDS
|
|
The
|
|
.BR ungetc
|
|
function conforms to ANSI/C.
|