.\" Copyright (c) 2003-2011 Tim Kientzle
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
.\"
.\" $FreeBSD$
.\"
.Dd February 28, 2017
.Dt ARCHIVE_WRITE_DATA 3
.Os
.Sh NAME
.Nm archive_write_data ,
.Nm archive_write_data_block
.Nd functions for creating archives
.Sh LIBRARY
Streaming Archive Library (libarchive, -larchive)
.Sh SYNOPSIS
.In archive.h
.Ft la_ssize_t
.Fn archive_write_data "struct archive *" "const void *" "size_t"
.Ft la_ssize_t
.Fn archive_write_data_block "struct archive *" "const void *" "size_t size" "int64_t offset"
.Sh DESCRIPTION
.Bl -tag -width indent
.It Fn archive_write_data
Write data corresponding to the header just written.
.It Fn archive_write_data_block
Write data corresponding to the header just written.
This is like
.Fn archive_write_data
except that it performs a seek on the file being
written to the specified offset before writing the data.
This is useful when restoring sparse files from archive
formats that support sparse files.
Returns number of bytes written or -1 on error.
(Note: This is currently not supported for
.Tn archive_write
handles, only for
.Tn archive_write_disk
handles.
.El
.\" .Sh EXAMPLE
.\"
.Sh RETURN VALUES
This function returns the number of bytes actually written, or
a negative error code on error.
.\"
.Sh ERRORS
Detailed error codes and textual descriptions are available from the
.Fn archive_errno
and
.Fn archive_error_string
functions.
.\"
.Sh BUGS
In libarchive 3.x, this function sometimes returns
zero on success instead of returning the number of bytes written.
Specifically, this occurs when writing to an
.Vt archive_write_disk
handle.
Clients should treat any value less than zero as an error
and consider any non-negative value as success.
.\"
.Sh SEE ALSO
.Xr tar 1 ,
.Xr libarchive 3 ,
.Xr archive_write_finish_entry 3 ,
.Xr archive_write_set_options 3 ,
.Xr cpio 5 ,
.Xr mtree 5 ,
.Xr tar 5