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.Dd February 2, 2012
.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 LIBRARY
Streaming Archive Library (libarchive, -larchive)
.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 .
