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09cad9b550
expand and clarify the description of the client callback functions and how they should handle errors. Thanks to: Antony Dovgal
136 lines
4.2 KiB
Groff
136 lines
4.2 KiB
Groff
.\" Copyright (c) 2003-2004 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 January 8, 2005
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.Dt archive_util 3
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.Os
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.Sh NAME
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.Nm archive_compression ,
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.Nm archive_compression_name ,
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.Nm archive_errno ,
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.Nm archive_error_string ,
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.Nm archive_format ,
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.Nm archive_format_name ,
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.Nm archive_set_error
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.Nd libarchive utility functions
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.Sh SYNOPSIS
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.In archive.h
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.Ft int
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.Fn archive_compression "struct archive *"
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.Ft const char *
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.Fn archive_compression_name "struct archive *"
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.Ft int
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.Fn archive_errno "struct archive *"
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.Ft const char *
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.Fn archive_error_string "struct archive *"
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.Ft int
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.Fn archive_format "struct archive *"
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.Ft const char *
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.Fn archive_format_name "struct archive *"
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.Ft int
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.Fn archive_set_error "struct archive *" "int error_code" "const char *fmt" "..."
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.Sh DESCRIPTION
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These functions provide access to various information about the
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.Tn struct archive
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object used in the
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.Xr libarchive 3
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library.
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.Bl -tag -compact -width indent
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.It Fn archive_compression
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Returns a numeric code indicating the current compression.
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This value is set by
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.Fn archive_read_open .
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.It Fn archive_compression_name
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Returns a text description of the current compression suitable for display.
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.It Fn archive_errno
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Returns a numeric error code (see
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.Xr errno 2 )
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indicating the reason for the most recent error return.
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.It Fn archive_error_string
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Returns a textual error message suitable for display.
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The error message here is usually more specific than that
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obtained from passing the result of
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.Fn archive_errno
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to
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.Xr strerror 3 .
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.It Fn archive_format
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Returns a numeric code indicating the format of the current
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archive entry.
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This value is set by a successful call to
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.Fn archive_read_next_header .
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Note that it is common for this value to change from
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entry to entry.
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For example, a tar archive might have several entries that
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utilize GNU tar extensions and several entries that do not.
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These entries will have different format codes.
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.It Fn archive_format_name
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A textual description of the format of the current entry.
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.It Fn archive_set_error
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Sets the numeric error code and error description that will be returned
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by
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.Fn archive_errno
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and
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.Fn archive_error_string .
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This function should be used within I/O callbacks to set system-specific
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error codes and error descriptions.
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This function accepts a printf-like format string and arguments.
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However, you should be careful to use only the following printf
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format specifiers:
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.Dq %c ,
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.Dq %d ,
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.Dq %jd ,
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.Dq %jo ,
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.Dq %ju ,
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.Dq %jx ,
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.Dq %ld ,
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.Dq %lo ,
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.Dq %lu ,
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.Dq %lx ,
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.Dq %o ,
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.Dq %u ,
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.Dq %s ,
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.Dq %x ,
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.Dq %% .
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Field-width specifiers and other printf features are
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not uniformly supported and should not be used.
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.El
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.Sh SEE ALSO
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.Xr archive_read 3 ,
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.Xr archive_write 3 ,
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.Xr libarchive 3 ,
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.Xr printf 3
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.Sh HISTORY
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The
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.Nm libarchive
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library first appeared in
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.Fx 5.3 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm libarchive
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library was written by
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.An Tim Kientzle Aq kientzle@acm.org .
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