local.h revision 23658 
1/*-
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)local.h	8.3 (Berkeley) 7/3/94
37 */
38
39/*
40 * Information local to this implementation of stdio,
41 * in particular, macros and private variables.
42 */
43
44extern int	__sflush __P((FILE *));
45extern FILE	*__sfp __P((void));
46extern int	__srefill __P((FILE *));
47extern int	__sread __P((void *, char *, int));
48extern int	__swrite __P((void *, char const *, int));
49extern fpos_t	__sseek __P((void *, fpos_t, int));
50extern int	__sclose __P((void *));
51extern void	__sinit __P((void));
52extern void	_cleanup __P((void));
53extern void	(*__cleanup) __P((void));
54extern void	__smakebuf __P((FILE *));
55extern int	__swhatbuf __P((FILE *, size_t *, int *));
56extern int	_fwalk __P((int (*)(FILE *)));
57extern int	__swsetup __P((FILE *));
58extern int	__sflags __P((const char *, int *));
59
60extern int	__sdidinit;
61
62/*
63 * Return true iff the given FILE cannot be written now.
64 */
65#define	cantwrite(fp) \
66	((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
67	 __swsetup(fp))
68
69/*
70 * Test whether the given stdio file has an active ungetc buffer;
71 * release such a buffer, without restoring ordinary unread data.
72 */
73#define	HASUB(fp) ((fp)->_ub._base != NULL)
74#define	FREEUB(fp) { \
75	if ((fp)->_ub._base != (fp)->_ubuf) \
76		free((char *)(fp)->_ub._base); \
77	(fp)->_ub._base = NULL; \
78}
79
80/*
81 * test for an fgetln() buffer.
82 */
83#define	HASLB(fp) ((fp)->_lb._base != NULL)
84#define	FREELB(fp) { \
85	free((char *)(fp)->_lb._base); \
86	(fp)->_lb._base = NULL; \
87}
88