crypto/bio/bss_null.c

   1 /*
   2  * Copyright 1995-2021 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
  15 static int null_write(BIO *h, const char *buf, int num);
  16 static int null_read(BIO *h, char *buf, int size);
  17 static int null_puts(BIO *h, const char *str);
  18 static int null_gets(BIO *h, char *str, int size);
  19 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  20 static const BIO_METHOD null_method = {
  21     BIO_TYPE_NULL,
  22     "NULL",
  23     bwrite_conv,
  24     null_write,
  25     bread_conv,
  26     null_read,
  27     null_puts,
  28     null_gets,
  29     null_ctrl,
  30     NULL,
  31     NULL,
  32     NULL,                     /* null_callback_ctrl */
  33 };
  34
  35 const BIO_METHOD *BIO_s_null(void)
  36 {
  37     return &null_method;
  38 }
  39
  40 static int null_read(BIO *b, char *out, int outl)
  41 {
  42     return 0;
  43 }
  44
  45 static int null_write(BIO *b, const char *in, int inl)
  46 {
  47     return inl;
  48 }
  49
  50 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
  51 {
  52     long ret = 1;
  53
  54     switch (cmd) {
  55     case BIO_CTRL_RESET:
  56     case BIO_CTRL_EOF:
  57     case BIO_CTRL_SET:
  58     case BIO_CTRL_SET_CLOSE:
  59     case BIO_CTRL_FLUSH:
  60     case BIO_CTRL_DUP:
  61         ret = 1;
  62         break;
  63     case BIO_CTRL_GET_CLOSE:
  64     case BIO_CTRL_INFO:
  65     case BIO_CTRL_GET:
  66     case BIO_CTRL_PENDING:
  67     case BIO_CTRL_WPENDING:
  68     default:
  69         ret = 0;
  70         break;
  71     }
  72     return ret;
  73 }
  74
  75 static int null_gets(BIO *bp, char *buf, int size)
  76 {
  77     return 0;
  78 }
  79
  80 static int null_puts(BIO *bp, const char *str)
  81 {
  82     if (str == NULL)
  83         return 0;
  84     return strlen(str);
  85 }