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+.TH archive_util 3 "January 8, 2005" ""
+.SH NAME
+\fBarchive_clear_error\fP,
+\fBarchive_compression\fP,
+\fBarchive_compression_name\fP,
+\fBarchive_copy_error\fP,
+\fBarchive_errno\fP,
+\fBarchive_error_string\fP,
+\fBarchive_format\fP,
+\fBarchive_format_name\fP,
+\fBarchive_set_error\fP
+\- libarchive utility functions
+.SH SYNOPSIS
+\fB#include <archive.h>\fP
+.br
+\fIvoid\fP
+.RE
+.nh
+\fBarchive_clear_error\fP
+.hy
+("struct archive *");
+\fIint\fP
+.RE
+.nh
+\fBarchive_compression\fP
+.hy
+("struct archive *");
+\fIconst char *\fP
+.RE
+.nh
+\fBarchive_compression_name\fP
+.hy
+("struct archive *");
+\fIvoid\fP
+.RE
+.nh
+\fBarchive_copy_error\fP
+.hy
+("struct archive *" "struct archive *");
+\fIint\fP
+.RE
+.nh
+\fBarchive_errno\fP
+.hy
+("struct archive *");
+\fIconst char *\fP
+.RE
+.nh
+\fBarchive_error_string\fP
+.hy
+("struct archive *");
+\fIint\fP
+.RE
+.nh
+\fBarchive_format\fP
+.hy
+("struct archive *");
+\fIconst char *\fP
+.RE
+.nh
+\fBarchive_format_name\fP
+.hy
+("struct archive *");
+\fIvoid\fP
+.RE
+.nh
+\fBarchive_set_error\fP
+.hy
+("struct archive *" "int error_code" "const char *fmt" "...");
+.SH DESCRIPTION
+These functions provide access to various information about the
+Tn struct archive
+object used in the
+\fBlibarchive\fP(3)
+library.
+.TP
+.nh
+\fBarchive_clear_error\fP
+.hy
+();
+Clears any error information left over from a previous call.
+Not generally used in client code.
+.TP
+.nh
+\fBarchive_compression\fP
+.hy
+();
+Returns a numeric code indicating the current compression.
+This value is set by
+.nh
+\fBarchive_read_open\fP
+.hy
+(.);
+.TP
+.nh
+\fBarchive_compression_name\fP
+.hy
+();
+Returns a text description of the current compression suitable for display.
+.TP
+.nh
+\fBarchive_copy_error\fP
+.hy
+();
+Copies error information from one archive to another.
+.TP
+.nh
+\fBarchive_errno\fP
+.hy
+();
+Returns a numeric error code (see
+\fBerrno\fP(2))
+indicating the reason for the most recent error return.
+.TP
+.nh
+\fBarchive_error_string\fP
+.hy
+();
+Returns a textual error message suitable for display.
+The error message here is usually more specific than that
+obtained from passing the result of
+.nh
+\fBarchive_errno\fP
+.hy
+();
+to
+\fBstrerror\fP(3).
+.TP
+.nh
+\fBarchive_format\fP
+.hy
+();
+Returns a numeric code indicating the format of the current
+archive entry.
+This value is set by a successful call to
+.nh
+\fBarchive_read_next_header\fP
+.hy
+(.);
+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.
+.TP
+.nh
+\fBarchive_format_name\fP
+.hy
+();
+A textual description of the format of the current entry.
+.TP
+.nh
+\fBarchive_set_error\fP
+.hy
+();
+Sets the numeric error code and error description that will be returned
+by
+.nh
+\fBarchive_errno\fP
+.hy
+();
+and
+.nh
+\fBarchive_error_string\fP
+.hy
+(.);
+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:
+``%c'',
+``%d'',
+``%jd'',
+``%jo'',
+``%ju'',
+``%jx'',
+``%ld'',
+``%lo'',
+``%lu'',
+``%lx'',
+``%o'',
+``%u'',
+``%s'',
+``%x'',
+``%%''.
+Field-width specifiers and other printf features are
+not uniformly supported and should not be used.
+.SH SEE ALSO
+\fBarchive_read\fP(3),
+\fBarchive_write\fP(3),
+\fBlibarchive\fP(3),
+\fBprintf\fP(3)
+.SH HISTORY
+The
+\fBlibarchive\fP
+library first appeared in
+FreeBSD 5.3.
+.SH AUTHORS
+-nosplit
+The
+\fBlibarchive\fP
+library was written by
+Tim Kientzle <kientzle@acm.org.>