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
38 FILE *
funopen(const void * cookie,int (* readfn)(void *,char *,int),int (* writefn)(void *,const char *,int),fpos_t (* seekfn)(void *,fpos_t,int),int (* closefn)(void *))39 funopen(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