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
42int
43setvbuf(FILE *iop, char *abuf, int type, size_t size)
44{
45
46	Uchar	*buf = (Uchar *)abuf;
47	Uchar *temp;
48	int	sflag = iop->_flag & _IOMYBUF;
49	rmutex_t *lk;
50	int fd = GET_FD(iop);
51
52	FLOCKFILE(lk, iop);
53	iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
54	switch (type) {
55	/* note that the flags are the same as the possible values for type */
56	case _IONBF:
57		iop->_flag |= _IONBF;	 /* file is unbuffered */
58#ifndef _STDIO_ALLOCATE
59		if (fd < 2) {
60			/* use special buffer for std{in,out} */
61			buf = (fd == 0) ? _sibuf : _sobuf;
62			size = BUFSIZ;
63		} else /* needed for ifdef */
64#endif
65		if (fd < _NFILE) {
66			buf = _smbuf[fd];
67			size = _SMBFSZ - PUSHBACK;
68		} else
69			if ((buf = malloc(_SMBFSZ * sizeof (Uchar))) != NULL) {
70				iop->_flag |= _IOMYBUF;
71				size = _SMBFSZ - PUSHBACK;
72			} else {
73				FUNLOCKFILE(lk);
74				return (EOF);
75			}
76		break;
77	case _IOLBF:
78	case _IOFBF:
79		iop->_flag |= type;	/* buffer file */
80		/*
81		 * need at least an 8 character buffer for
82		 * out_of_sync concerns.
83		 */
84		if (size <= _SMBFSZ) {
85			size = BUFSIZ;
86			buf = NULL;
87		}
88		if (buf == NULL) {
89			if ((buf = malloc(sizeof (Uchar) *
90			    (size + _SMBFSZ))) != NULL)
91				iop->_flag |= _IOMYBUF;
92			else {
93				FUNLOCKFILE(lk);
94				return (EOF);
95			}
96		}
97		else
98			size -= _SMBFSZ;
99		break;
100	default:
101		FUNLOCKFILE(lk);
102		return (EOF);
103	}
104	if (iop->_base != NULL && sflag)
105		free((char *)iop->_base - PUSHBACK);
106	temp = buf + PUSHBACK;
107	iop->_base = temp;
108	_setbufend(iop, temp + size);
109	iop->_ptr = temp;
110	iop->_cnt = 0;
111	FUNLOCKFILE(lk);
112	return (0);
113}
114