1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)funopen.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/funopen.c,v 1.6 2007/01/09 00:28:06 imp Exp $
34 */
35
36 #include <stdio.h>
37 #include <errno.h>
38
39 #include "local.h"
40
41 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 *))42 funopen(const void *cookie, int (*readfn)(void *, char *, int),
43 int (*writefn)(void *, const char *, int),
44 fpos_t (*seekfn)(void *, fpos_t, int), int (*closefn)(void *))
45 {
46 FILE *fp;
47 int flags;
48
49 if (readfn == NULL) {
50 if (writefn == NULL) { /* illegal */
51 errno = EINVAL;
52 return (NULL);
53 } else
54 flags = __SWR; /* write only */
55 } else {
56 if (writefn == NULL)
57 flags = __SRD; /* read only */
58 else
59 flags = __SRW; /* read-write */
60 }
61 if ((fp = __sfp()) == NULL)
62 return (NULL);
63 fp->pub._flags = flags;
64 fp->pub._fileno = -1;
65 fp->_cookie = (void *)cookie;
66 fp->_read = readfn;
67 fp->_write = writefn;
68 fp->_seek = seekfn;
69 fp->_close = closefn;
70 return (fp);
71 }
72