funopen.c revision 1.4 1 1.4 jtc /* $NetBSD: funopen.c,v 1.4 1995/02/02 02:09:44 jtc Exp $ */
2 1.4 jtc
3 1.1 cgd /*-
4 1.4 jtc * Copyright (c) 1990, 1993
5 1.4 jtc * The Regents of the University of California. All rights reserved.
6 1.1 cgd *
7 1.1 cgd * This code is derived from software contributed to Berkeley by
8 1.1 cgd * Chris Torek.
9 1.1 cgd *
10 1.1 cgd * Redistribution and use in source and binary forms, with or without
11 1.1 cgd * modification, are permitted provided that the following conditions
12 1.1 cgd * are met:
13 1.1 cgd * 1. Redistributions of source code must retain the above copyright
14 1.1 cgd * notice, this list of conditions and the following disclaimer.
15 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 cgd * notice, this list of conditions and the following disclaimer in the
17 1.1 cgd * documentation and/or other materials provided with the distribution.
18 1.1 cgd * 3. All advertising materials mentioning features or use of this software
19 1.1 cgd * must display the following acknowledgement:
20 1.1 cgd * This product includes software developed by the University of
21 1.1 cgd * California, Berkeley and its contributors.
22 1.1 cgd * 4. Neither the name of the University nor the names of its contributors
23 1.1 cgd * may be used to endorse or promote products derived from this software
24 1.1 cgd * without specific prior written permission.
25 1.1 cgd *
26 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 1.1 cgd * SUCH DAMAGE.
37 1.1 cgd */
38 1.1 cgd
39 1.1 cgd #if defined(LIBC_SCCS) && !defined(lint)
40 1.4 jtc #if 0
41 1.4 jtc static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93";
42 1.4 jtc #endif
43 1.4 jtc static char rcsid[] = "$NetBSD: funopen.c,v 1.4 1995/02/02 02:09:44 jtc Exp $";
44 1.1 cgd #endif /* LIBC_SCCS and not lint */
45 1.1 cgd
46 1.1 cgd #include <stdio.h>
47 1.1 cgd #include <errno.h>
48 1.1 cgd #include "local.h"
49 1.1 cgd
50 1.1 cgd FILE *
51 1.1 cgd funopen(cookie, readfn, writefn, seekfn, closefn)
52 1.1 cgd const void *cookie;
53 1.1 cgd int (*readfn)(), (*writefn)();
54 1.1 cgd #if __STDC__
55 1.1 cgd fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
56 1.1 cgd #else
57 1.1 cgd fpos_t (*seekfn)();
58 1.1 cgd #endif
59 1.1 cgd int (*closefn)();
60 1.1 cgd {
61 1.1 cgd register FILE *fp;
62 1.1 cgd int flags;
63 1.1 cgd
64 1.1 cgd if (readfn == NULL) {
65 1.1 cgd if (writefn == NULL) { /* illegal */
66 1.1 cgd errno = EINVAL;
67 1.1 cgd return (NULL);
68 1.1 cgd } else
69 1.1 cgd flags = __SWR; /* write only */
70 1.1 cgd } else {
71 1.1 cgd if (writefn == NULL)
72 1.1 cgd flags = __SRD; /* read only */
73 1.1 cgd else
74 1.1 cgd flags = __SRW; /* read-write */
75 1.1 cgd }
76 1.1 cgd if ((fp = __sfp()) == NULL)
77 1.1 cgd return (NULL);
78 1.1 cgd fp->_flags = flags;
79 1.1 cgd fp->_file = -1;
80 1.1 cgd fp->_cookie = (void *)cookie;
81 1.1 cgd fp->_read = readfn;
82 1.1 cgd fp->_write = writefn;
83 1.1 cgd fp->_seek = seekfn;
84 1.1 cgd fp->_close = closefn;
85 1.1 cgd return (fp);
86 1.1 cgd }
87