funopen.c revision 1.12 
1/*	$NetBSD: funopen.c,v 1.12 2012/03/15 18:22:30 christos 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. 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 <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: funopen.c,v 1.12 2012/03/15 18:22:30 christos Exp $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include <stdio.h>
45#include <errno.h>
46#include "reentrant.h"
47#include "local.h"
48
49FILE *
50funopen(const void *cookie,
51    int (*readfn)(void *, char *, int),
52    int (*writefn)(void *, const char *, int),
53    off_t (*seekfn)(void *, off_t, int),
54    int (*closefn)(void *))
55{
56	FILE *fp;
57	int flags;
58
59	if (readfn == NULL) {
60		if (writefn == NULL) {		/* illegal */
61			errno = EINVAL;
62			return NULL;
63		} else
64			flags = __SWR;		/* write only */
65	} else {
66		if (writefn == NULL)
67			flags = __SRD;		/* read only */
68		else
69			flags = __SRW;		/* read-write */
70	}
71	if ((fp = __sfp()) == NULL)
72		return NULL;
73	fp->_flags = flags;
74	fp->_file = -1;
75	fp->_cookie = __UNCONST(cookie);
76	fp->_read = readfn;
77	fp->_write = writefn;
78	fp->_seek = seekfn;
79	fp->_close = closefn;
80	return fp;
81}
82