/* $OpenBSD: bss_null.c,v 1.12 2022/01/07 09:02:17 tb Exp $ */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <openssl/bio.h>

#include "bio_local.h"

static int null_write(BIO *h, const char *buf, int num);

static int null_read(BIO *h, char *buf, int size);

static int null_puts(BIO *h, const char *str);

static int null_gets(BIO *h, char *str, int size);

static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);

static int null_new(BIO *h);

static int null_free(BIO *data);

static const BIO_METHOD null_method = {

  .type = BIO_TYPE_NULL,

  .name = "NULL",

  .bwrite = null_write,

  .bread = null_read,

  .bputs = null_puts,

  .bgets = null_gets,

  .ctrl = null_ctrl,

  .create = null_new,

  .destroy = null_free

};

const BIO_METHOD *

BIO_s_null(void)

{

  return (&null_method);

}

static int

null_new(BIO *bi)

{

  bi->init = 1;

  bi->num = 0;

  bi->ptr = (NULL);

  return (1);

}

static int

null_free(BIO *a)

{

  if (a == NULL)

    return (0);

  return (1);

}

static int

null_read(BIO *b, char *out, int outl)

{

  return (0);

}

static int

null_write(BIO *b, const char *in, int inl)

{

  return (inl);

}

static long

null_ctrl(BIO *b, int cmd, long num, void *ptr)

{

  long ret = 1;

  switch (cmd) {

  case BIO_CTRL_RESET:

  case BIO_CTRL_EOF:

  case BIO_CTRL_SET:

  case BIO_CTRL_SET_CLOSE:

  case BIO_CTRL_FLUSH:

  case BIO_CTRL_DUP:

    ret = 1;

    break;

  case BIO_CTRL_GET_CLOSE:

  case BIO_CTRL_INFO:

  case BIO_CTRL_GET:

  case BIO_CTRL_PENDING:

  case BIO_CTRL_WPENDING:

  default:

    ret = 0;

    break;

  }

  return (ret);

}

static int

null_gets(BIO *bp, char *buf, int size)

{

  return (0);

}

static int

null_puts(BIO *bp, const char *str)

{

  if (str == NULL)

    return (0);

  return (strlen(str));

}