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1.\" $OpenBSD: BUF_MEM_new.3,v 1.19 2024/07/24 08:57:58 tb Exp $
2.\" OpenSSL doc/crypto/buffer.pod 18edda0f Sep 20 03:28:54 2000 +0000
3.\" not merged: 74924dcb, 58e3457a, 21b0fa91, 7644a9ae
4.\" OpenSSL doc/crypto/BUF_MEM_new.pod 53934822 Jun 9 16:39:19 2016 -0400
5.\" not merged: c952780c, 91da5e77
6.\" OpenSSL doc/man3/BUF_MEM_new.pod 498180de Dec 12 15:35:09 2016 +0300
7.\"
8.\" This file was written by Ralf S. Engelschall <rse@openssl.org>.
9.\" Copyright (c) 1999, 2000, 2016 The OpenSSL Project. All rights reserved.
10.\"
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12.\" modification, are permitted provided that the following conditions
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55.Dd $Mdocdate: July 24 2024 $
56.Dt BUF_MEM_NEW 3
57.Os
58.Sh NAME
59.Nm BUF_MEM_new ,
60.Nm BUF_MEM_free ,
61.Nm BUF_MEM_grow ,
62.Nm BUF_MEM_grow_clean
63.Nd simple character arrays structure
64.Sh SYNOPSIS
65.In openssl/buffer.h
66.Ft BUF_MEM *
67.Fo BUF_MEM_new
68.Fa void
69.Fc
70.Ft void
71.Fo BUF_MEM_free
72.Fa "BUF_MEM *a"
73.Fc
74.Ft int
75.Fo BUF_MEM_grow
76.Fa "BUF_MEM *str"
77.Fa "size_t len"
78.Fc
79.Ft int
80.Fo BUF_MEM_grow_clean
81.Fa "BUF_MEM *str"
82.Fa "size_t len"
83.Fc
84.Sh DESCRIPTION
85The buffer library handles simple character arrays.
86Buffers are used for various purposes in the library, most notably
87memory BIOs.
88.Pp
89The library uses the
90.Vt BUF_MEM
91structure defined in buffer.h:
92.Bd -literal
93typedef struct buf_mem_st {
94 size_t length; /* current number of bytes */
95 char *data;
96 size_t max; /* size of buffer */
97} BUF_MEM;
98.Ed
99.Pp
100.Fa length
101is the current size of the buffer in bytes;
102.Fa max
103is the amount of memory allocated to the buffer.
104There are three functions which handle these and one miscellaneous function.
105.Pp
106.Fn BUF_MEM_new
107allocates a new buffer of zero size.
108.Pp
109.Fn BUF_MEM_free
110frees up an already existing buffer.
111The data is zeroed before freeing up in case the buffer contains
112sensitive data.
113If
114.Fa a
115is a
116.Dv NULL
117pointer, no action occurs.
118.Pp
119.Fn BUF_MEM_grow
120changes the size of an already existing buffer to
121.Fa len .
122Any data already in the buffer is preserved if it increases in size.
123.Pp
124.Fn BUF_MEM_grow_clean
125is similar to
126.Fn BUF_MEM_grow ,
127but it sets any freed or additionally allocated memory to zero.
128.Sh RETURN VALUES
129.Fn BUF_MEM_new
130returns the buffer or
131.Dv NULL
132on error.
133.Pp
134.Fn BUF_MEM_grow
135and
136.Fn BUF_MEM_grow_clean
137return zero on error or the new size (i.e.\&
138.Fa len ) .
139.Sh SEE ALSO
140.Xr BIO_new 3 ,
141.Xr BIO_s_mem 3
142.Sh HISTORY
143.Fn BUF_MEM_new ,
144.Fn BUF_MEM_free ,
145and
146.Fn BUF_MEM_grow
147first appeared in SSLeay 0.6.0.
148All these functions have been available since
149.Ox 2.4 .
150.Pp
151.Fn BUF_MEM_grow_clean
152first appeared in OpenSSL 0.9.7 and has been available since
153.Ox 3.2 .
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