_flsbuf.c revision 1846:376b8b33ed65 
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 2006 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
33#pragma weak _flsbuf = __flsbuf
34#include "synonyms.h"
35#include "file64.h"
36#include <mtlib.h>
37#include <stdio.h>
38#include <thread.h>
39#include <synch.h>
40#include <unistd.h>
41#include <sys/types.h>
42#include "stdiom.h"
43
44int
45_flsbuf(int ch, FILE *iop)	/* flush (write) buffer, save ch, */
46				/* return EOF on failure */
47{
48	Uchar uch;
49
50	do	/* only loop if need to use _wrtchk() on non-_IOFBF */
51	{
52		switch (iop->_flag & (_IOFBF | _IOLBF | _IONBF |
53				_IOWRT | _IOEOF))
54		{
55		case _IOFBF | _IOWRT:	/* okay to do full-buffered case */
56			if (iop->_base != 0 && iop->_ptr > iop->_base)
57				goto flush_putc;	/* skip _wrtchk() */
58			break;
59		case _IOLBF | _IOWRT:	/* okay to do line-buffered case */
60			if (iop->_ptr >= _bufend(iop))
61				/*
62				 * which will recursively call
63				 * __flsbuf via putc because of no room
64				 * in the buffer for the character
65				 */
66				goto flush_putc;
67			if ((*iop->_ptr++ = (unsigned char)ch) == '\n')
68				(void) _xflsbuf(iop);
69			iop->_cnt = 0;
70			goto out;
71		case _IONBF | _IOWRT:	/* okay to do no-buffered case */
72			iop->_cnt = 0;
73			uch = (unsigned char)ch;
74			if (write(GET_FD(iop), (char *)&uch, 1) != 1)
75				iop->_flag |= _IOERR;
76			goto out;
77		}
78		if (_wrtchk(iop) != 0)	/* check, correct permissions */
79			return (EOF);
80	} while (iop->_flag & (_IOLBF | _IONBF));
81flush_putc:;
82	(void) _xflsbuf(iop);
83	(void) PUTC(ch, iop); /*  recursive call */
84out:;
85		/* necessary for putc() */
86	return ((iop->_flag & _IOERR) ? EOF : (unsigned char)ch);
87}
88