funopen.c revision 1.7 
1/*	$NetBSD: funopen.c,v 1.7 1998/11/15 17:19:53 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. 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 1.7 1998/11/15 17:19:53 christos Exp $");
45#endif
46#endif /* LIBC_SCCS and not lint */
47
48#include <stdio.h>
49#include <errno.h>
50#include "local.h"
51
52FILE *
53funopen(cookie, readfn, writefn, seekfn, closefn)
54	const void *cookie;
55	int (*readfn) __P((void *, char *, int));
56	int (*writefn) __P((void *, const char *, int));
57	fpos_t (*seekfn) __P((void *, fpos_t, int));
58	int (*closefn) __P((void *));
59{
60	FILE *fp;
61	int flags;
62
63	if (readfn == NULL) {
64		if (writefn == NULL) {		/* illegal */
65			errno = EINVAL;
66			return (NULL);
67		} else
68			flags = __SWR;		/* write only */
69	} else {
70		if (writefn == NULL)
71			flags = __SRD;		/* read only */
72		else
73			flags = __SRW;		/* read-write */
74	}
75	if ((fp = __sfp()) == NULL)
76		return (NULL);
77	fp->_flags = flags;
78	fp->_file = -1;
79	/* LINTED we don't play with cookie */
80	fp->_cookie = (void *)cookie;
81	fp->_read = readfn;
82	fp->_write = writefn;
83	fp->_seek = seekfn;
84	fp->_close = closefn;
85	return (fp);
86}
87