1/*	$OpenBSD: funopen.c,v 1.8 2005/08/08 08:05:36 espie Exp $ */
2/*-
3 * Copyright (c) 1990, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <stdio.h>
35#include <errno.h>
36#include "local.h"
37
38FILE *
39funopen(const void *cookie, int (*readfn)(void *, char *, int),
40	int (*writefn)(void *, const char *, int),
41	fpos_t (*seekfn)(void *, fpos_t, int), int (*closefn)(void *))
42{
43	FILE *fp;
44	int flags;
45
46	if (readfn == NULL) {
47		if (writefn == NULL) {		/* illegal */
48			errno = EINVAL;
49			return (NULL);
50		} else
51			flags = __SWR;		/* write only */
52	} else {
53		if (writefn == NULL)
54			flags = __SRD;		/* read only */
55		else
56			flags = __SRW;		/* read-write */
57	}
58	if ((fp = __sfp()) == NULL)
59		return (NULL);
60	fp->_flags = flags;
61	fp->_file = -1;
62	fp->_cookie = (void *)cookie;		/* SAFE: cookie not modified */
63	fp->_read = readfn;
64	fp->_write = writefn;
65	fp->_seek = seekfn;
66	fp->_close = closefn;
67	return (fp);
68}
69