funopen.c revision 1.8 
1/*	$NetBSD: funopen.c,v 1.8 2003/01/18 11:29:54 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40#if defined(LIBC_SCCS) && !defined(lint)
41#if 0
42static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
43#else
44__RCSID("$NetBSD: funopen.c,v 1.8 2003/01/18 11:29:54 thorpej Exp $");
45#endif
46#endif /* LIBC_SCCS and not lint */
47
48#include <stdio.h>
49#include <errno.h>
50#include "reentrant.h"
51#include "local.h"
52
53FILE *
54funopen(cookie, readfn, writefn, seekfn, closefn)
55	const void *cookie;
56	int (*readfn) __P((void *, char *, int));
57	int (*writefn) __P((void *, const char *, int));
58	fpos_t (*seekfn) __P((void *, fpos_t, int));
59	int (*closefn) __P((void *));
60{
61	FILE *fp;
62	int flags;
63
64	if (readfn == NULL) {
65		if (writefn == NULL) {		/* illegal */
66			errno = EINVAL;
67			return (NULL);
68		} else
69			flags = __SWR;		/* write only */
70	} else {
71		if (writefn == NULL)
72			flags = __SRD;		/* read only */
73		else
74			flags = __SRW;		/* read-write */
75	}
76	if ((fp = __sfp()) == NULL)
77		return (NULL);
78	fp->_flags = flags;
79	fp->_file = -1;
80	/* LINTED we don't play with cookie */
81	fp->_cookie = (void *)cookie;
82	fp->_read = readfn;
83	fp->_write = writefn;
84	fp->_seek = seekfn;
85	fp->_close = closefn;
86	return (fp);
87}
88