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
37/*
38 * Information local to this implementation of stdio,
39 * in particular, macros and private variables.
40 */
41
42int      __sflush (FILE *);
43FILE    *__sfp (void);
44int	     __srefill (FILE *);
45int	     __sread (void *, char *, int);
46int      __swrite (void *, char const *, int);
47fpos_t   __sseek (void *, fpos_t, int);
48int      __sclose (void *);
49void     __sinit (void);
50void     _cleanup (void);
51void     (*_IO_cleanup) (void);
52void     __smakebuf (FILE *);
53int      __swhatbuf (FILE *, size_t *, int *);
54int      _fwalk (int (*)(FILE *));
55int      __swsetup (FILE *);
56int      __sflags (const char *, int *);
57
58extern int __sdidinit;
59
60/*
61 * Return true if the given FILE cannot be written now.
62 */
63#define	cantwrite(fp) \
64	((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
65	 __swsetup(fp))
66
67/*
68 * Test whether the given stdio file has an active ungetc buffer;
69 * release such a buffer, without restoring ordinary unread data.
70 */
71#define	HASUB(fp) ((fp)->_ub._base != NULL)
72#define	FREEUB(fp) { \
73	if ((fp)->_ub._base != (fp)->_ubuf) \
74		free((char *)(fp)->_ub._base); \
75	(fp)->_ub._base = NULL; \
76}
77
78/*
79 * test for an fgetln() buffer.
80 */
81#define	HASLB(fp) ((fp)->_lb._base != NULL)
82#define	FREELB(fp) { \
83	free((char *)(fp)->_lb._base); \
84	(fp)->_lb._base = NULL; \
85}
86