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/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
22/*	  All Rights Reserved  	*/
23
24/*
25 * University Copyright- Copyright (c) 1982, 1986, 1988
26 * The Regents of the University of California
27 * All Rights Reserved
28 *
29 * University Acknowledgment- Portions of this document are derived from
30 * software developed by the University of California, Berkeley, and its
31 * contributors.
32 */
33
34/*
35 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
36 * Use is subject to license terms.
37 */
38
39/*LINTLIBRARY*/
40
41#include <sys/types.h>
42#include "file64.h"
43#include <stdio.h>
44#include "stdiom.h"
45#include <stdlib.h>
46
47extern Uchar _smbuf[][_NFILE];
48
49void
50setbuffer(FILE *iop, char *abuf, int asize)
51{
52	Uchar *buf = (Uchar *)abuf;
53	int fno = fileno(iop);  /* file number */
54	int size = asize - _SMBFSZ;
55	Uchar *temp;
56
57	if (iop->_base != 0 && iop->_flag & _IOMYBUF)
58		free((char *)iop->_base - PUSHBACK);
59	iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
60	if (buf == 0) {
61		iop->_flag |= _IONBF;
62		if (fno < 2) {
63			/* use special buffer for std{in,out} */
64			buf = (fno == 0) ? _sibuf : _sobuf;
65			size = BUFSIZ - _SMBFSZ;
66		} else if (fno < _NFILE) {
67			buf = _smbuf[fno];
68			size = _SMBFSZ - PUSHBACK;
69		} else if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) !=
70		    0) {
71			iop->_flag |= _IOMYBUF;
72			size = _SMBFSZ - PUSHBACK;
73		}
74	} else /* regular buffered I/O, specified buffer size */ {
75		if (size <= 0)
76			return;
77	}
78	if (buf == 0)
79		return; /* malloc() failed */
80	temp = buf + PUSHBACK;
81	iop->_base = temp;
82	_setbufend(iop, temp + size);
83	iop->_ptr = temp;
84	iop->_cnt = 0;
85}
86
87/*
88 * set line buffering
89 */
90
91int
92setlinebuf(FILE *iop)
93{
94	char *buf;
95
96	(void) fflush(iop);
97	setbuffer(iop, (char *)NULL, 0);
98	buf = (char *)malloc(128);
99	if (buf != NULL) {
100		setbuffer(iop, buf, 128);
101		iop->_flag |= _IOLBF|_IOMYBUF;
102	}
103	return (0);	/* returns no useful value, keep the same prototype */
104}
105