208 lines
6.0 KiB
Groff
208 lines
6.0 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.37
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ========================================================================
|
|
.de Sh \" Subsection heading
|
|
.br
|
|
.if t .Sp
|
|
.ne 5
|
|
.PP
|
|
\fB\\$1\fR
|
|
.PP
|
|
..
|
|
.de Sp \" Vertical space (when we can't use .PP)
|
|
.if t .sp .5v
|
|
.if n .sp
|
|
..
|
|
.de Vb \" Begin verbatim text
|
|
.ft CW
|
|
.nf
|
|
.ne \\$1
|
|
..
|
|
.de Ve \" End verbatim text
|
|
.ft R
|
|
.fi
|
|
..
|
|
.\" Set up some character translations and predefined strings. \*(-- will
|
|
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
|
|
.\" double quote, and \*(R" will give a right double quote. | will give a
|
|
.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to
|
|
.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C'
|
|
.\" expand to `' in nroff, nothing in troff, for use with C<>.
|
|
.tr \(*W-|\(bv\*(Tr
|
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
|
.ie n \{\
|
|
. ds -- \(*W-
|
|
. ds PI pi
|
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
|
. ds L" ""
|
|
. ds R" ""
|
|
. ds C` ""
|
|
. ds C' ""
|
|
'br\}
|
|
.el\{\
|
|
. ds -- \|\(em\|
|
|
. ds PI \(*p
|
|
. ds L" ``
|
|
. ds R" ''
|
|
'br\}
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
|
.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
|
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.\"
|
|
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
|
|
.\" way too many mistakes in technical documents.
|
|
.hy 0
|
|
.if n .na
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ========================================================================
|
|
.\"
|
|
.IX Title "buffer 3"
|
|
.TH buffer 3 "2009-06-14" "0.9.8k" "OpenSSL"
|
|
.SH "NAME"
|
|
BUF_MEM_new, BUF_MEM_free, BUF_MEM_grow, BUF_strdup \- simple
|
|
character arrays structure
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/buffer.h>
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& BUF_MEM *BUF_MEM_new(void);
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& void BUF_MEM_free(BUF_MEM *a);
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& int BUF_MEM_grow(BUF_MEM *str, int len);
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& char * BUF_strdup(const char *str);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "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 \s-1BUF_MEM\s0 structure defined in buffer.h:
|
|
.PP
|
|
.Vb 6
|
|
\& typedef struct buf_mem_st
|
|
\& {
|
|
\& int length; /* current number of bytes */
|
|
\& char *data;
|
|
\& int max; /* size of buffer */
|
|
\& } BUF_MEM;
|
|
.Ve
|
|
.PP
|
|
\&\fBlength\fR is the current size of the buffer in bytes, \fBmax\fR is the amount of
|
|
memory allocated to the buffer. There are three functions which handle these
|
|
and one \*(L"miscellaneous\*(R" function.
|
|
.PP
|
|
\&\fIBUF_MEM_new()\fR allocates a new buffer of zero size.
|
|
.PP
|
|
\&\fIBUF_MEM_free()\fR frees up an already existing buffer. The data is zeroed
|
|
before freeing up in case the buffer contains sensitive data.
|
|
.PP
|
|
\&\fIBUF_MEM_grow()\fR changes the size of an already existing buffer to
|
|
\&\fBlen\fR. Any data already in the buffer is preserved if it increases in
|
|
size.
|
|
.PP
|
|
\&\fIBUF_strdup()\fR copies a null terminated string into a block of allocated
|
|
memory and returns a pointer to the allocated block.
|
|
Unlike the standard C library \fIstrdup()\fR this function uses \fIOPENSSL_malloc()\fR and so
|
|
should be used in preference to the standard library \fIstrdup()\fR because it can
|
|
be used for memory leak checking or replacing the \fImalloc()\fR function.
|
|
.PP
|
|
The memory allocated from \fIBUF_strdup()\fR should be freed up using the \fIOPENSSL_free()\fR
|
|
function.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIBUF_MEM_new()\fR returns the buffer or \s-1NULL\s0 on error.
|
|
.PP
|
|
\&\fIBUF_MEM_free()\fR has no return value.
|
|
.PP
|
|
\&\fIBUF_MEM_grow()\fR returns zero on error or the new size (i.e. \fBlen\fR).
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIbio\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\fIBUF_MEM_new()\fR, \fIBUF_MEM_free()\fR and \fIBUF_MEM_grow()\fR are available in all
|
|
versions of SSLeay and OpenSSL. \fIBUF_strdup()\fR was added in SSLeay 0.8.
|