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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" 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.
-.\"
-.\"     @(#)setbuf.3	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt SETBUF 3
-.Os BSD 4
-.Sh NAME
-.Nm setbuf ,
-.Nm setbuffer ,
-.Nm setlinebuf ,
-.Nm setvbuf
-.Nd stream buffering operations
-.Sh SYNOPSIS
-.Fd #include <stdio.h>
-.Ft void
-.Fn setbuf "FILE *stream" "char *buf"
-.Ft void
-.Fn setbuffer "FILE *stream" "char *buf" "int size"
-.Ft int
-.Fn setlinebuf "FILE *stream"
-.Ft int
-.Fn setvbuf "FILE *stream" "char *buf" "int mode" "size_t size"
-.Sh DESCRIPTION
-The three types of buffering available are unbuffered, block buffered,
-and line buffered.
-When an output stream is unbuffered, information appears on the
-destination file or terminal as soon as written;
-when it is block buffered many characters are saved up and written as a block;
-when it is line buffered characters are saved up until a newline is
-output or input is read from any stream attached to a terminal device
-(typically stdin).
-The function
-.Xr fflush 3
-may be used to force the block out early.
-(See 
-.Xr fclose 3 . )
-.Pp
-Normally all files are block buffered.
-When the first
-.Tn I/O
-operation occurs on a file,
-.Xr malloc 3
-is called,
-and an optimally-sized buffer is obtained.
-If a stream refers to a terminal
-(as
-.Em stdout
-normally does) it is line buffered.
-The standard error stream
-.Em stderr
-is always unbuffered.
-.Pp
-The
-.Fn setvbuf
-function
-may be used to alter the buffering behavior of a stream.
-The
-.Fa mode
-parameter must be one of the following three macros:
-.Bl -tag -width _IOFBF -offset indent
-.It Dv _IONBF
-unbuffered
-.It Dv _IOLBF
-line buffered
-.It Dv _IOFBF
-fully buffered
-.El
-.Pp
-The
-.Fa size
-parameter may be given as zero
-to obtain deferred optimal-size buffer allocation as usual.
-If it is not zero,
-then except for unbuffered files, the 
-.Fa buf
-argument should point to a buffer at least
-.Fa size
-bytes long;
-this buffer will be used instead of the current buffer.
-(If the
-.Fa size
-argument
-is not zero but
-.Fa buf
-is
-.Dv NULL ,
-a buffer of the given size will be allocated immediately,
-and released on close.
-This is an extension to ANSI C;
-portable code should use a size of 0 with any
-.Dv NULL
-buffer.)
-.Pp
-The
-.Fn setvbuf
-function may be used at any time,
-but may have peculiar side effects
-(such as discarding input or flushing output)
-if the stream is ``active''.
-Portable applications should call it only once on any given stream,
-and before any 
-.Tn I/O
-is performed.
-.Pp
-The other three calls are, in effect, simply aliases for calls to
-.Fn setvbuf .
-Except for the lack of a return value, the
-.Fn setbuf
-function is exactly equivalent to the call
-.Pp
-.Dl "setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);"
-.Pp
-The
-.Fn setbuffer
-function
-is the same, except that the size of the buffer is up to the caller,
-rather than being determined by the default
-.Dv BUFSIZ .
-The
-.Fn setlinebuf
-function
-is exactly equivalent to the call:
-.Pp
-.Dl "setvbuf(stream, (char *)NULL, _IOLBF, 0);"
-.Sh RETURN VALUES
-The
-.Fn setvbuf
-function returns 0 on success, or
-.Dv EOF
-if the request cannot be honored
-(note that the stream is still functional in this case).
-.Pp
-The
-.Fn setlinebuf
-function returns what the equivalent
-.Fn setvbuf
-would have returned.
-.Sh SEE ALSO
-.Xr fclose 3 ,
-.Xr fopen 3 ,
-.Xr fread 3 ,
-.Xr malloc 3 ,
-.Xr printf 3 ,
-.Xr puts 3
-.Sh STANDARDS
-The
-.Fn setbuf
-and
-.Fn setvbuf
-functions
-conform to
-.St -ansiC .
-.Sh BUGS
-The
-.Fn setbuffer
-and
-.Fn setlinebuf
-functions are not portable to versions of
-.Bx
-before
-.Bx 4.2 .
-On
-.Bx 4.2
-and
-.Bx 4.3
-systems,
-.Fn setbuf
-always uses a suboptimal buffer size and should be avoided.