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. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <stdio.h>
40#include <errno.h>
41
42#include "local.h"
43
44FILE *
45funopen(const void *cookie,
46	int (*readfn)(void *, char *, int),
47	int (*writefn)(void *, const char *, int),
48	fpos_t (*seekfn)(void *, fpos_t, int),
49	int (*closefn)(void *))
50{
51	FILE *fp;
52	int flags;
53
54	if (readfn == NULL) {
55		if (writefn == NULL) {		/* illegal */
56			errno = EINVAL;
57			return (NULL);
58		} else
59			flags = __SWR;		/* write only */
60	} else {
61		if (writefn == NULL)
62			flags = __SRD;		/* read only */
63		else
64			flags = __SRW;		/* read-write */
65	}
66	if ((fp = __sfp()) == NULL)
67		return (NULL);
68	fp->_flags = flags;
69	fp->_file = -1;
70	fp->_cookie = (void *)cookie;
71	fp->_read = readfn;
72	fp->_write = writefn;
73	fp->_seek = seekfn;
74	fp->_close = closefn;
75	return (fp);
76}
77