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-.\"     $OpenBSD: BUF_MEM_new.3,v 1.16 2019/06/06 01:06:58 schwarze Exp $
-.\"     OpenSSL doc/crypto/buffer.pod 18edda0f Sep 20 03:28:54 2000 +0000
-.\"     not merged: 74924dcb, 58e3457a, 21b0fa91, 7644a9ae
-.\"     OpenSSL doc/crypto/BUF_MEM_new.pod 53934822 Jun 9 16:39:19 2016 -0400
-.\"     not merged: c952780c, 91da5e77
-.\"     OpenSSL doc/man3/BUF_MEM_new.pod 498180de Dec 12 15:35:09 2016 +0300
-.\"
-.\" This file was written by Ralf S. Engelschall <rse@openssl.org>.
-.\" Copyright (c) 1999, 2000, 2016 The OpenSSL Project.  All rights reserved.
-.\"
-.\" 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 above 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 acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED 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 OpenSSL PROJECT OR
-.\" ITS 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.
-.\"
-.Dd $Mdocdate: June 6 2019 $
-.Dt BUF_MEM_NEW 3
-.Os
-.Sh NAME
-.Nm BUF_MEM_new ,
-.Nm BUF_MEM_free ,
-.Nm BUF_MEM_grow ,
-.Nm BUF_MEM_grow_clean ,
-.Nm BUF_reverse ,
-.Nm BUF_strdup
-.Nd simple character arrays structure
-.Sh SYNOPSIS
-.In openssl/buffer.h
-.Ft BUF_MEM *
-.Fo BUF_MEM_new
-.Fa void
-.Fc
-.Ft void
-.Fo BUF_MEM_free
-.Fa "BUF_MEM *a"
-.Fc
-.Ft int
-.Fo BUF_MEM_grow
-.Fa "BUF_MEM *str"
-.Fa "size_t len"
-.Fc
-.Ft int
-.Fo BUF_MEM_grow_clean
-.Fa "BUF_MEM *str"
-.Fa "size_t len"
-.Fc
-.Ft void
-.Fo BUF_reverse
-.Fa "unsigned char *out"
-.Fa "const unsigned char *in"
-.Fa "size_t len"
-.Fc
-.Ft char *
-.Fo BUF_strdup
-.Fa "const char *str"
-.Fc
-.Sh DESCRIPTION
-The buffer library handles simple character arrays.
-Buffers are used for various purposes in the library, most notably
-memory BIOs.
-.Pp
-The library uses the
-.Vt BUF_MEM
-structure defined in buffer.h:
-.Bd -literal
-typedef struct buf_mem_st
-{
-        size_t length;  /* current number of bytes */
-        char *data;
-        size_t max;     /* size of buffer */
-} BUF_MEM;
-.Ed
-.Pp
-.Fa length
-is the current size of the buffer in bytes;
-.Fa max
-is the amount of memory allocated to the buffer.
-There are three functions which handle these and one miscellaneous function.
-.Pp
-.Fn BUF_MEM_new
-allocates a new buffer of zero size.
-.Pp
-.Fn BUF_MEM_free
-frees up an already existing buffer.
-The data is zeroed before freeing up in case the buffer contains
-sensitive data.
-If
-.Fa a
-is a
-.Dv NULL
-pointer, no action occurs.
-.Pp
-.Fn BUF_MEM_grow
-changes the size of an already existing buffer to
-.Fa len .
-Any data already in the buffer is preserved if it increases in size.
-.Pp
-.Fn BUF_MEM_grow_clean
-is similar to
-.Fn BUF_MEM_grow ,
-but it sets any freed or additionally allocated memory to zero.
-.Pp
-.Fn BUF_reverse
-reverses
-.Fa len
-bytes at
-.Fa in
-into
-.Fa out .
-If
-.Fa in
-is
-.Dv NULL ,
-.Fa out
-is reversed in place.
-.Pp
-.Fn BUF_strdup
-copies a NUL terminated string into a block of allocated memory and
-returns a pointer to the allocated block.
-Unlike the system
-.Xr strdup 3
-function,
-.Fn BUF_strdup
-will accept a
-.Dv NULL
-argument and will return
-.Dv NULL
-in that case.
-Its use in new programs is discouraged.
-.Pp
-The memory allocated from
-.Fn BUF_strdup
-should be freed up using the
-.Xr free 3
-function.
-.Sh RETURN VALUES
-.Fn BUF_MEM_new
-returns the buffer or
-.Dv NULL
-on error.
-.Pp
-.Fn BUF_MEM_grow
-and
-.Fn BUF_MEM_grow_clean
-return zero on error or the new size (i.e.\&
-.Fa len ) .
-.Sh SEE ALSO
-.Xr BIO_new 3 ,
-.Xr BIO_s_mem 3
-.Sh HISTORY
-.Fn BUF_MEM_new ,
-.Fn BUF_MEM_free ,
-and
-.Fn BUF_MEM_grow
-first appeared in SSLeay 0.6.0.
-.Fn BUF_strdup
-first appeared in SSLeay 0.8.0.
-All these functions  have been available since
-.Ox 2.4 .
-.Pp
-.Fn BUF_MEM_grow_clean
-first appeared in OpenSSL 0.9.7 and has been available since
-.Ox 3.2 .
-.Pp
-.Fn BUF_reverse
-first appeared in OpenSSL 1.0.0 and has been available since
-.Ox 4.9 .