.\"=============================================================================
.\" Header
.\"
.\" Copyright (c) 2021 Michael Baeuerle
.\"
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.TH cl_hp_unfold_field 3 2021-11-24 Unix "canlock-hp 3.3.0 manual"
.\"
.\"
.\"=============================================================================
.\" NAME section
.\"
.SH NAME
cl_hp_unfold_field - Unfold header field
.\"
.\"
.\"=============================================================================
.\" SYNOPSIS section
.\"
.SH SYNOPSIS
.nf
.B #include <libcanlock-3/canlock-hp.h>
.sp
.BI "char *cl_hp_unfold_field(const char *" data ", size_t *" data_len );
.\"
.\"
.\"=============================================================================
.\" DESCRIPTION section
.\"
.SH DESCRIPTION
The
.BR cl_hp_unfold_field ()
function unfolds a header field.
.PP
The parameter
.I data
should point to the beginning of the input data.
.br
Specify the length of the input data with the value pointed to by the
.I data_len
parameter.
.PP
RFC 5322 specifies in Section 2.2 that CR and LF control characters in header
field bodies are allowed for folding use only.
This function removes all CR and LF control characters from the input data.
.\"
.\"
.\"=============================================================================
.\" RETURN VALUE section
.\"
.SH RETURN VALUE
Upon successful completion a pointer to a new memory block, containing the
unfolded header field with NUL-termination, is returned. Otherwise,
.B NULL
is returned.
.sp
On success, the caller is responsible to
.BR free ()
the memory block allocated for the output data.
.sp
On success the value pointed to by
.I data_len
is updated to the length of the unfolded header field (without NUL-termination).
.\"
.\"
.\"=============================================================================
.\" AUTHORS section
.\"
.SH AUTHORS
Michael Baeuerle
.\"
.\"
.\"=============================================================================
.\" REPORTING BUGS section
.\"
.SH REPORTING BUGS
Report bugs to <mailto:michael.baeuerle@gmx.net>.
.\"
.\"
.\"=============================================================================
.\" STANDARDS section
.\"
.SH STANDARDS
.BR cl_hp_unfold_field ()
tries to comply with the following standards:
.PP
RFC 5322
.\"
.\"
.\"=============================================================================
.\" SEE ALSO section
.\"
.SH SEE ALSO
.BR free (3),
.BR cl_hp_get_field (3),
.BR cl_hp_parse_field (3),
.BR canlock-hfp (1),
.BR canlock-mhp (1),
.BR canlock (1)
.\"
.\"
.\" EOF