xref: /titanic_44/usr/src/ucblib/libucb/inc/stdiom.h (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
29*7c478bd9Sstevel@tonic-gate 
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate  * University Copyright- Copyright (c) 1982, 1986, 1988
32*7c478bd9Sstevel@tonic-gate  * The Regents of the University of California
33*7c478bd9Sstevel@tonic-gate  * All Rights Reserved
34*7c478bd9Sstevel@tonic-gate  *
35*7c478bd9Sstevel@tonic-gate  * University Acknowledgment- Portions of this document are derived from
36*7c478bd9Sstevel@tonic-gate  * software developed by the University of California, Berkeley, and its
37*7c478bd9Sstevel@tonic-gate  * contributors.
38*7c478bd9Sstevel@tonic-gate  */
39*7c478bd9Sstevel@tonic-gate 
40*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate /*
43*7c478bd9Sstevel@tonic-gate  * stdiom.h - shared guts of stdio therefore it doesn't need
44*7c478bd9Sstevel@tonic-gate  * a surrounding #ifndef
45*7c478bd9Sstevel@tonic-gate  */
46*7c478bd9Sstevel@tonic-gate 
47*7c478bd9Sstevel@tonic-gate #ifndef _STDIOM_H
48*7c478bd9Sstevel@tonic-gate #define	_STDIOM_H
49*7c478bd9Sstevel@tonic-gate 
50*7c478bd9Sstevel@tonic-gate typedef unsigned char	Uchar;
51*7c478bd9Sstevel@tonic-gate 
52*7c478bd9Sstevel@tonic-gate #define	MAXVAL (MAXINT - (MAXINT % BUFSIZ))
53*7c478bd9Sstevel@tonic-gate 
54*7c478bd9Sstevel@tonic-gate /*
55*7c478bd9Sstevel@tonic-gate  * The number of actual pushback characters is the value
56*7c478bd9Sstevel@tonic-gate  * of PUSHBACK plus the first byte of the buffer. The FILE buffer must,
57*7c478bd9Sstevel@tonic-gate  * for performance reasons, start on a word aligned boundry so the value
58*7c478bd9Sstevel@tonic-gate  * of PUSHBACK should be a multiple of word.
59*7c478bd9Sstevel@tonic-gate  * At least 4 bytes of PUSHBACK are needed. If sizeof(int) = 1 this breaks.
60*7c478bd9Sstevel@tonic-gate  */
61*7c478bd9Sstevel@tonic-gate 
62*7c478bd9Sstevel@tonic-gate #define	PUSHBACK ((int)(((3 + sizeof (int) - 1) / sizeof (int)) * sizeof (int)))
63*7c478bd9Sstevel@tonic-gate 
64*7c478bd9Sstevel@tonic-gate /* minimum buffer size must be at least 8 or shared library will break */
65*7c478bd9Sstevel@tonic-gate #define	_SMBFSZ (((PUSHBACK + 4) < 8) ? 8 : (PUSHBACK + 4))
66*7c478bd9Sstevel@tonic-gate 
67*7c478bd9Sstevel@tonic-gate extern Uchar *_bufendtab[];
68*7c478bd9Sstevel@tonic-gate 
69*7c478bd9Sstevel@tonic-gate #if BUFSIZ == 1024
70*7c478bd9Sstevel@tonic-gate #define	MULTIBFSZ(SZ)	((SZ) & ~0x3ff)
71*7c478bd9Sstevel@tonic-gate #elif BUFSIZ == 512
72*7c478bd9Sstevel@tonic-gate #define	MULTIBFSZ(SZ)    ((SZ) & ~0x1ff)
73*7c478bd9Sstevel@tonic-gate #else
74*7c478bd9Sstevel@tonic-gate #define	MULTIBFSZ(SZ)    ((SZ) - (SZ % BUFSIZ))
75*7c478bd9Sstevel@tonic-gate #endif
76*7c478bd9Sstevel@tonic-gate 
77*7c478bd9Sstevel@tonic-gate #define	_bufend(iop)	_realbufend(iop)
78*7c478bd9Sstevel@tonic-gate #define	setbufend(iop, end)	_setbufend(iop, end)
79*7c478bd9Sstevel@tonic-gate 
80*7c478bd9Sstevel@tonic-gate 	/*
81*7c478bd9Sstevel@tonic-gate 	 * Internal routines from _iob.c
82*7c478bd9Sstevel@tonic-gate 	 */
83*7c478bd9Sstevel@tonic-gate extern void	_cleanup(void);
84*7c478bd9Sstevel@tonic-gate extern void	_flushlbf(void);
85*7c478bd9Sstevel@tonic-gate extern FILE	*_findiop(void);
86*7c478bd9Sstevel@tonic-gate extern Uchar 	*_realbufend(FILE *iop);
87*7c478bd9Sstevel@tonic-gate extern void	_setbufend(FILE *iop, Uchar *end);
88*7c478bd9Sstevel@tonic-gate extern int	_wrtchk(FILE *iop);
89*7c478bd9Sstevel@tonic-gate 
90*7c478bd9Sstevel@tonic-gate 	/*
91*7c478bd9Sstevel@tonic-gate 	 * Internal routines from flush.c
92*7c478bd9Sstevel@tonic-gate 	 */
93*7c478bd9Sstevel@tonic-gate extern void	_bufsync(FILE *iop, Uchar *bufend);
94*7c478bd9Sstevel@tonic-gate extern int	_xflsbuf(FILE *iop);
95*7c478bd9Sstevel@tonic-gate 
96*7c478bd9Sstevel@tonic-gate 	/*
97*7c478bd9Sstevel@tonic-gate 	 * Internal routines from _findbuf.c
98*7c478bd9Sstevel@tonic-gate 	 */
99*7c478bd9Sstevel@tonic-gate extern Uchar 	*_findbuf(FILE *iop);
100*7c478bd9Sstevel@tonic-gate 
101*7c478bd9Sstevel@tonic-gate /*
102*7c478bd9Sstevel@tonic-gate  * The following macros improve performance of the stdio by reducing the
103*7c478bd9Sstevel@tonic-gate  * number of calls to _bufsync and _wrtchk.  _needsync checks whether
104*7c478bd9Sstevel@tonic-gate  * or not _bufsync needs to be called.  _WRTCHK has the same effect as
105*7c478bd9Sstevel@tonic-gate  * _wrtchk, but often these functions have no effect, and in those cases
106*7c478bd9Sstevel@tonic-gate  * the macros avoid the expense of calling the functions.
107*7c478bd9Sstevel@tonic-gate  */
108*7c478bd9Sstevel@tonic-gate 
109*7c478bd9Sstevel@tonic-gate #define	_needsync(p, bufend)	((bufend - (p)->_ptr) < \
110*7c478bd9Sstevel@tonic-gate 				((p)->_cnt < 0 ? 0 : (p)->_cnt))
111*7c478bd9Sstevel@tonic-gate 
112*7c478bd9Sstevel@tonic-gate #define	_WRTCHK(iop)	((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) || \
113*7c478bd9Sstevel@tonic-gate 				(iop->_base == 0) || \
114*7c478bd9Sstevel@tonic-gate 				(iop->_ptr == iop->_base && iop->_cnt == 0 && \
115*7c478bd9Sstevel@tonic-gate 				!(iop->_flag & (_IONBF | _IOLBF)))) \
116*7c478bd9Sstevel@tonic-gate 			? _wrtchk(iop) : 0)
117*7c478bd9Sstevel@tonic-gate #endif /* _STDIOM_H */
118