1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
typedef int Read(void *, char *, int);
typedef int Write(void *, const char *, int);
typedef fpos_t Seek(void *, fpos_t, int);
typedef int Close(void *);
struct Funopen {
void *cookie;
Read *readfn;
Write *writefn;
Close *closefn;
};
static ssize_t cookieRead(void *cookie, char *buf, size_t size) {
struct Funopen *funopen = cookie;
return funopen->readfn(funopen->cookie, buf, size);
}
static ssize_t cookieWrite(void *cookie, const char *buf, size_t size) {
struct Funopen *funopen = cookie;
return funopen->writefn(funopen->cookie, buf, size);
}
static int cookieClose(void *cookie) {
struct Funopen *funopen = cookie;
int ret = 0;
if (funopen->closefn) ret = funopen->closefn(funopen->cookie);
free(cookie);
return ret;
}
FILE *funopen(
const void *cookie,
Read *readfn, Write *writefn, Seek *seekfn, Close *closefn
) {
struct Funopen *funopen = malloc(sizeof(*funopen));
if (!funopen) return NULL;
funopen->cookie = (void *)cookie;
funopen->readfn = readfn;
funopen->writefn = writefn;
assert(!seekfn);
funopen->closefn = closefn;
cookie_io_functions_t fns = {
.read = (readfn ? cookieRead : NULL),
.write = (writefn ? cookieWrite : NULL),
.close = cookieClose,
};
return fopencookie(funopen, (!readfn ? "w" : !writefn ? "r" : "r+"), fns);
}
|