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.\" Copyright (c) 2003-2011 Tim Kientzle
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 28, 2017
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.Dt ARCHIVE_WRITE_DATA 3
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.Os
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.Sh NAME
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.Nm archive_write_data ,
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.Nm archive_write_data_block
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.Nd functions for creating archives
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.Sh LIBRARY
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Streaming Archive Library (libarchive, -larchive)
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.Sh SYNOPSIS
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.In archive.h
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.Ft la_ssize_t
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.Fn archive_write_data "struct archive *" "const void *" "size_t"
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.Ft la_ssize_t
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.Fn archive_write_data_block "struct archive *" "const void *" "size_t size" "int64_t offset"
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.Sh DESCRIPTION
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.Bl -tag -width indent
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.It Fn archive_write_data
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Write data corresponding to the header just written.
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.It Fn archive_write_data_block
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Write data corresponding to the header just written.
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This is like
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.Fn archive_write_data
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except that it performs a seek on the file being
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written to the specified offset before writing the data.
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This is useful when restoring sparse files from archive
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formats that support sparse files.
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Returns number of bytes written or -1 on error.
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(Note: This is currently not supported for
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.Tn archive_write
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handles, only for
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.Tn archive_write_disk
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handles.
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.El
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.\" .Sh EXAMPLE
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.\"
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.Sh RETURN VALUES
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This function returns the number of bytes actually written, or
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a negative error code on error.
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.\"
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.Sh ERRORS
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Detailed error codes and textual descriptions are available from the
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.Fn archive_errno
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and
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.Fn archive_error_string
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functions.
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.\"
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.Sh BUGS
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In libarchive 3.x, this function sometimes returns
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zero on success instead of returning the number of bytes written.
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Specifically, this occurs when writing to an
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.Vt archive_write_disk
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handle.
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Clients should treat any value less than zero as an error
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and consider any non-negative value as success.
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.\"
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.Sh SEE ALSO
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.Xr tar 1 ,
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.Xr libarchive 3 ,
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.Xr archive_write_finish_entry 3 ,
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.Xr archive_write_set_options 3 ,
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.Xr cpio 5 ,
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.Xr mtree 5 ,
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.Xr tar 5
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