1 |
|
|
/* $OpenBSD: funopen.c,v 1.9 2015/08/31 02:53:57 guenther 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 * |
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 |
|
|
DEF_WEAK(funopen); |