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/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/*

Modified copy of setbuf.c to support the setbuffer function

defined as part of BSD.

Modifications by Gareth Pearce, 2001.

*/

/*

FUNCTION

<<setbuffer>>---specify full buffering for a file or stream with size

INDEX

        setbuffer

ANSI_SYNOPSIS

        #include <stdio.h>

        void setbuffer(FILE *<[fp]>, char *<[buf]>, int <[size]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        void setbuffer(<[fp]>, <[buf]>, <[size]>)

        FILE *<[fp]>;

        char *<[buf]>;

        int <[size]>;

DESCRIPTION

<<setbuffer>> specifies that output to the file or stream identified by

<[fp]> should be fully buffered.  All output for this file will go to a

buffer (of size <[size]>).  Output will be passed on to the host system

only when the buffer is full, or when an input operation intervenes.

You may, if you wish, supply your own buffer by passing a pointer to

it as the argument <[buf]>.  It must have size <[size]>.  You can

also use <<NULL>> as the value of <[buf]>, to signal that the

<<setbuffer>> function is to allocate the buffer.

WARNINGS

You may only use <<setbuffer>> before performing any file operation

other than opening the file.

If you supply a non-null <[buf]>, you must ensure that the associated

storage continues to be available until you close the stream

identified by <[fp]>.

RETURNS

<<setbuffer>> does not return a result.

PORTABILITY

This function comes from BSD not ANSI or POSIX.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <_ansi.h>

#include <stdio.h>

#include "local.h"

_VOID

_DEFUN(setbuffer, (fp, buf, size),

       FILE * fp _AND

       char *buf _AND

       int size)

{

  _CAST_VOID setvbuf (fp, buf, buf ? _IOFBF : _IONBF, (size_t) size);

}