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 weak __flsbuf = _flsbuf
31
32#include "lint.h"
33#include "file64.h"
34#include <mtlib.h>
35#include <stdio.h>
36#include <thread.h>
37#include <synch.h>
38#include <unistd.h>
39#include <sys/types.h>
40#include "stdiom.h"
41
42/*
43 * flush (write) buffer, save ch,
44 * return EOF on failure
45 */
46int
47_flsbuf(int ch, FILE *iop)
48{
49	Uchar uch;
50
51	do {	/* only loop if need to use _wrtchk() on non-_IOFBF */
52		switch (iop->_flag & (_IOFBF | _IOLBF | _IONBF |
53		    _IOWRT | _IOEOF)) {
54		case _IOFBF | _IOWRT:	/* okay to do full-buffered case */
55			if (iop->_base != 0 && iop->_ptr > iop->_base)
56				goto flush_putc;	/* skip _wrtchk() */
57			break;
58		case _IOLBF | _IOWRT:	/* okay to do line-buffered case */
59			if (iop->_ptr >= _bufend(iop))
60				/*
61				 * which will recursively call
62				 * __flsbuf via putc because of no room
63				 * in the buffer for the character
64				 */
65				goto flush_putc;
66			if ((*iop->_ptr++ = (unsigned char)ch) == '\n')
67				(void) _xflsbuf(iop);
68			iop->_cnt = 0;
69			goto out;
70		case _IONBF | _IOWRT:	/* okay to do no-buffered case */
71			iop->_cnt = 0;
72			uch = (unsigned char)ch;
73			if (_xwrite(iop, (char *)&uch, 1) != 1) {
74				if (!cancel_active())
75					iop->_flag |= _IOERR;
76				return (EOF);
77			}
78			goto out;
79		}
80		if (_wrtchk(iop) != 0)	/* check, correct permissions */
81			return (EOF);
82	} while (iop->_flag & (_IOLBF | _IONBF));
83flush_putc:
84	(void) _xflsbuf(iop);
85	(void) PUTC(ch, iop); /*  recursive call */
86out:
87	/* necessary for putc() */
88	return ((iop->_flag & _IOERR) ? EOF : (unsigned char)ch);
89}
90