1/*
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <errno.h>
12#include "bio_local.h"
13#include "internal/cryptlib.h"
14
15static int null_write(BIO *h, const char *buf, int num);
16static int null_read(BIO *h, char *buf, int size);
17static int null_puts(BIO *h, const char *str);
18static int null_gets(BIO *h, char *str, int size);
19static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
20static const BIO_METHOD null_method = {
21 BIO_TYPE_NULL,
22 "NULL",
23 /* TODO: Convert to new style write function */
24 bwrite_conv,
25 null_write,
26 /* TODO: Convert to new style read function */
27 bread_conv,
28 null_read,
29 null_puts,
30 null_gets,
31 null_ctrl,
32 NULL,
33 NULL,
34 NULL, /* null_callback_ctrl */
35};
36
37const BIO_METHOD *BIO_s_null(void)
38{
39 return &null_method;
40}
41
42static int null_read(BIO *b, char *out, int outl)
43{
44 return 0;
45}
46
47static int null_write(BIO *b, const char *in, int inl)
48{
49 return inl;
50}
51
52static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
53{
54 long ret = 1;
55
56 switch (cmd) {
57 case BIO_CTRL_RESET:
58 case BIO_CTRL_EOF:
59 case BIO_CTRL_SET:
60 case BIO_CTRL_SET_CLOSE:
61 case BIO_CTRL_FLUSH:
62 case BIO_CTRL_DUP:
63 ret = 1;
64 break;
65 case BIO_CTRL_GET_CLOSE:
66 case BIO_CTRL_INFO:
67 case BIO_CTRL_GET:
68 case BIO_CTRL_PENDING:
69 case BIO_CTRL_WPENDING:
70 default:
71 ret = 0;
72 break;
73 }
74 return ret;
75}
76
77static int null_gets(BIO *bp, char *buf, int size)
78{
79 return 0;
80}
81
82static int null_puts(BIO *bp, const char *str)
83{
84 if (str == NULL)
85 return 0;
86 return strlen(str);
87}
88