223 lines
7.0 KiB
Groff
223 lines
7.0 KiB
Groff
.\" Copyright (c) 2003-2007 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: head/lib/libarchive/archive_util.3 201098 2009-12-28 02:58:14Z kientzle $
|
|
.\"
|
|
.Dd January 8, 2005
|
|
.Dt ARCHIVE_UTIL 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm archive_clear_error ,
|
|
.Nm archive_compression ,
|
|
.Nm archive_compression_name ,
|
|
.Nm archive_copy_error ,
|
|
.Nm archive_errno ,
|
|
.Nm archive_error_string ,
|
|
.Nm archive_file_count ,
|
|
.Nm archive_filter_code ,
|
|
.Nm archive_filter_count ,
|
|
.Nm archive_filter_name ,
|
|
.Nm archive_format ,
|
|
.Nm archive_format_name ,
|
|
.Nm archive_position ,
|
|
.Nm archive_set_error
|
|
.Nd libarchive utility functions
|
|
.Sh SYNOPSIS
|
|
.In archive.h
|
|
.Ft void
|
|
.Fn archive_clear_error "struct archive *"
|
|
.Ft int
|
|
.Fn archive_compression "struct archive *"
|
|
.Ft const char *
|
|
.Fn archive_compression_name "struct archive *"
|
|
.Ft void
|
|
.Fn archive_copy_error "struct archive *" "struct archive *"
|
|
.Ft int
|
|
.Fn archive_errno "struct archive *"
|
|
.Ft const char *
|
|
.Fn archive_error_string "struct archive *"
|
|
.Ft int
|
|
.Fn archive_file_count "struct archive *"
|
|
.Ft int
|
|
.Fn archive_filter_code "struct archive *" "int"
|
|
.Ft int
|
|
.Fn archive_filter_count "struct archive *" "int"
|
|
.Ft const char *
|
|
.Fn archive_filter_name "struct archive *" "int"
|
|
.Ft int
|
|
.Fn archive_format "struct archive *"
|
|
.Ft const char *
|
|
.Fn archive_format_name "struct archive *"
|
|
.Ft int64_t
|
|
.Fn archive_position "struct archive *" "int"
|
|
.Ft void
|
|
.Fo archive_set_error
|
|
.Fa "struct archive *"
|
|
.Fa "int error_code"
|
|
.Fa "const char *fmt"
|
|
.Fa "..."
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
These functions provide access to various information about the
|
|
.Tn struct archive
|
|
object used in the
|
|
.Xr libarchive 3
|
|
library.
|
|
.Bl -tag -compact -width indent
|
|
.It Fn archive_clear_error
|
|
Clears any error information left over from a previous call.
|
|
Not generally used in client code.
|
|
.It Fn archive_compression
|
|
Synonym for
|
|
.Fn archive_filter_code(a, 0) .
|
|
.It Fn archive_compression_name
|
|
Synonym for
|
|
.Fn archive_filter_name(a, 0) .
|
|
.It Fn archive_copy_error
|
|
Copies error information from one archive to another.
|
|
.It Fn archive_errno
|
|
Returns a numeric error code (see
|
|
.Xr errno 2 )
|
|
indicating the reason for the most recent error return.
|
|
Note that this can not be reliably used to detect whether an
|
|
error has occurred.
|
|
It should be used only after another libarchive function
|
|
has returned an error status.
|
|
.It Fn archive_error_string
|
|
Returns a textual error message suitable for display.
|
|
The error message here is usually more specific than that
|
|
obtained from passing the result of
|
|
.Fn archive_errno
|
|
to
|
|
.Xr strerror 3 .
|
|
.It Fn archive_file_count
|
|
Returns a count of the number of files processed by this archive object.
|
|
The count is incremented by calls to
|
|
.Xr archive_write_header 3
|
|
or
|
|
.Xr archive_read_next_header 3 .
|
|
.It Fn archive_filter_code
|
|
Returns a numeric code identifying the indicated filter.
|
|
See
|
|
.Fn archive_filter_count
|
|
for details of the numbering.
|
|
.It Fn archive_filter_count
|
|
Returns the number of filters in the current pipeline.
|
|
For read archive handles, these filters are added automatically
|
|
by the automatic format detection.
|
|
For write archive handles, these filters are added by calls to the various
|
|
.Fn archive_write_add_filter_XXX
|
|
functions.
|
|
Filters in the resulting pipeline are numbered so that filter 0
|
|
is the filter closest to the format handler.
|
|
As a convenience, functions that expect a filter number will
|
|
accept -1 as a synonym for the highest-numbered filter.
|
|
.Pp
|
|
For example, when reading a uuencoded gzipped tar archive, there
|
|
are three filters:
|
|
filter 0 is the gunzip filter,
|
|
filter 1 is the uudecode filter,
|
|
and filter 2 is the pseudo-filter that wraps the archive read functions.
|
|
In this case, requesting
|
|
.Fn archive_position(a, -1)
|
|
would be a synonym for
|
|
.Fn archive_position(a, 2)
|
|
which would return the number of bytes currently read from the archive, while
|
|
.Fn archive_position(a, 1)
|
|
would return the number of bytes after uudecoding, and
|
|
.Fn archive_position(a, 0)
|
|
would return the number of bytes after decompression.
|
|
.It Fn archive_filter_name
|
|
Returns a textual name identifying the indicated filter.
|
|
See
|
|
.Fn archive_filter_count
|
|
for details of the numbering.
|
|
.It Fn archive_format
|
|
Returns a numeric code indicating the format of the current
|
|
archive entry.
|
|
This value is set by a successful call to
|
|
.Fn archive_read_next_header .
|
|
Note that it is common for this value to change from
|
|
entry to entry.
|
|
For example, a tar archive might have several entries that
|
|
utilize GNU tar extensions and several entries that do not.
|
|
These entries will have different format codes.
|
|
.It Fn archive_format_name
|
|
A textual description of the format of the current entry.
|
|
.It Fn archive_position
|
|
Returns the number of bytes read from or written to the indicated filter.
|
|
In particular,
|
|
.Fn archive_position(a, 0)
|
|
returns the number of bytes read or written by the format handler, while
|
|
.Fn archive_position(a, -1)
|
|
returns the number of bytes read or written to the archive.
|
|
See
|
|
.Fn archive_filter_count
|
|
for details of the numbering here.
|
|
.It Fn archive_set_error
|
|
Sets the numeric error code and error description that will be returned
|
|
by
|
|
.Fn archive_errno
|
|
and
|
|
.Fn archive_error_string .
|
|
This function should be used within I/O callbacks to set system-specific
|
|
error codes and error descriptions.
|
|
This function accepts a printf-like format string and arguments.
|
|
However, you should be careful to use only the following printf
|
|
format specifiers:
|
|
.Dq %c ,
|
|
.Dq %d ,
|
|
.Dq %jd ,
|
|
.Dq %jo ,
|
|
.Dq %ju ,
|
|
.Dq %jx ,
|
|
.Dq %ld ,
|
|
.Dq %lo ,
|
|
.Dq %lu ,
|
|
.Dq %lx ,
|
|
.Dq %o ,
|
|
.Dq %u ,
|
|
.Dq %s ,
|
|
.Dq %x ,
|
|
.Dq %% .
|
|
Field-width specifiers and other printf features are
|
|
not uniformly supported and should not be used.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr archive_read 3 ,
|
|
.Xr archive_write 3 ,
|
|
.Xr libarchive 3 ,
|
|
.Xr printf 3
|
|
.Sh HISTORY
|
|
The
|
|
.Nm libarchive
|
|
library first appeared in
|
|
.Fx 5.3 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm libarchive
|
|
library was written by
|
|
.An Tim Kientzle Aq kientzle@acm.org .
|