1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include "lint.h"
33#include "file64.h"
34#include "mtlib.h"
35#include <sys/types.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <thread.h>
39#include <synch.h>
40#include "stdiom.h"
41
42
43void
44setbuf(FILE *iop, char *abuf)
45{
46	Uchar *buf = (Uchar *)abuf;
47	int fno = GET_FD(iop);  /* file number */
48	int size = BUFSIZ - _SMBFSZ;
49	Uchar *temp;
50	rmutex_t *lk;
51
52	FLOCKFILE(lk, iop);
53	if ((iop->_base != 0) && (iop->_flag & _IOMYBUF))
54		free((char *)iop->_base - PUSHBACK);
55	iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
56	if (buf == 0) {
57		iop->_flag |= _IONBF;
58#ifndef _STDIO_ALLOCATE
59		if (fno < 2) {
60			/* use special buffer for std{in,out} */
61			buf = (fno == 0) ? _sibuf : _sobuf;
62		} else	/* needed for ifndef */
63#endif
64		if (fno < _NFILE) {
65			buf = _smbuf[fno];
66			size = _SMBFSZ - PUSHBACK;
67		} else
68		if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != 0) {
69			iop->_flag |= _IOMYBUF;
70			size = _SMBFSZ - PUSHBACK;
71		}
72	} else {	/* regular buffered I/O, standard buffer size */
73		if (isatty(fno))
74			iop->_flag |= _IOLBF;
75	}
76	if (buf == 0) {
77		FUNLOCKFILE(lk);
78		return;		/* malloc() failed */
79	}
80	temp = buf + PUSHBACK;
81	iop->_base = temp;
82	_setbufend(iop, temp + size);
83	iop->_ptr = temp;
84	iop->_cnt = 0;
85	FUNLOCKFILE(lk);
86}
87