1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <stdio.h>
36#include <errno.h>
37
38#include "local.h"
39
40FILE *
41funopen(const void *cookie,
42	int (*readfn)(void *, char *, int),
43	int (*writefn)(void *, const char *, int),
44	fpos_t (*seekfn)(void *, fpos_t, int),
45	int (*closefn)(void *))
46{
47	FILE *fp;
48	int flags;
49
50	if (readfn == NULL) {
51		if (writefn == NULL) {		/* illegal */
52			errno = EINVAL;
53			return (NULL);
54		} else
55			flags = __SWR;		/* write only */
56	} else {
57		if (writefn == NULL)
58			flags = __SRD;		/* read only */
59		else
60			flags = __SRW;		/* read-write */
61	}
62	if ((fp = __sfp()) == NULL)
63		return (NULL);
64	fp->_flags = flags;
65	fp->_file = -1;
66	fp->_cookie = (void *)cookie;
67	fp->_read = readfn;
68	fp->_write = writefn;
69	fp->_seek = seekfn;
70	fp->_close = closefn;
71	return (fp);
72}
73