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-.\" 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
-.\"
-.Dd June 4, 1993
-.Dt UNGETC 3
-.Os
-.Sh NAME
-.Nm ungetc
-.Nd un-get character from input stream
-.Sh SYNOPSIS
-.Fd #include <stdio.h>
-.Ft int
-.Fn ungetc "int c" "FILE *stream"
-.Sh DESCRIPTION
-The
-.Fn ungetc
-function pushes the character
-.Fa c
-(converted to an unsigned char)
-back onto the input stream pointed to by
-.Fa 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
-.Po
-.Xr fseek 3 ,
-.Xr fsetpos 3 ,
-or
-.Xr rewind 3
-.Pc
-will discard the pushed back characters.
-.Pp
-One character of push-back is guaranteed,
-but as long as there is
-sufficient memory, an effectively infinite amount of pushback is allowed.
-.Pp
-If a character is successfully pushed-back,
-the end-of-file indicator for the stream is cleared.
-.Sh RETURN VALUES
-The
-.Fn ungetc
-function
-returns
-the character pushed-back after the conversion, or
-.Dv EOF
-if the operation fails.
-If the value of the argument
-.Fa c
-character equals
-.Dv EOF ,
-the operation will fail and the stream will remain unchanged.
-.Sh SEE ALSO
-.Xr fseek 3 ,
-.Xr getc 3 ,
-.Xr setvbuf 3
-.Sh STANDARDS
-The
-.Fn ungetc
-function conforms to
-.St -ansiC .